Biocoatings and additives as promising candidates for ultralow friction systems

refereedrefRefereedRefereegranskatFagfellevurdertreviewforArticle, review/surveyArtikel, forskningsöversiktArtikkel, forskningsoversiktarticleA. da CruzMarcia GabrielyautStockholms universitet, Institutionen för material- och miljökemi (MMK)orcid.org=0000-0002-0357-0012diva-portal.org=authority-person:86716BudnyakTetyana M.autStockholms universitet, Institutionen för material- och miljökemi (MMK)orcid.org=0000-0003-2112-9308diva-portal.org=authority-person:70440M. RodriguesBruno V.autStockholms universitet, Institutionen för material- och miljökemi (MMK)orcid.org=0000-0002-0130-8029diva-portal.org=authority-person:86717BudnykSerhiyautSlabonAdamautStockholms universitet, Institutionen för material- och miljökemi (MMK)orcid.org=0000-0002-4452-1831diva-portal.org=authority-person:84424Stockholms universitetNaturvetenskapliga fakultetenInstitutionen för material- och miljökemi (MMK)pblBiocoatings and additives as promising candidates for ultralow friction systemseng20212021-06-17T10:42:00https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-19427910.1080/17518253.2021.1921286000647660200001https://doi.org/10.1080/17518253.2021.1921286textBiobased materialslignincellulosechitosandiamond-like carbonlubricantsuperlubricityGreen & Sustainable Science & TechnologyNatural SciencesChemical SciencesNaturvetenskapKemiThe achievement of frictionless systems, known as superlubricity, has become of great importance concerning energy saving and emission reduction. In parallel, the drive toward sustainability and environmental aspects has led to intense advances in the research and development of biobased materials. From the standpoint of Green Chemistry principles, this review presents a critical overview of the latest findings and future perspectives on the application of biobased materials aiming at superlubricant pursuits. The progress in the use of biomacromolecules, such as chitosan, cellulose, and lignin, as additives to lubricants or coating materials, are addressed, as well as the advances on sustainable coatings based on diamond-like carbon (DLC). Deeper investigations on the development of non-hazardous processes dedicated to the tribological properties of DLC, such as electrochemical synthesis using environment-friendly solvents to generate molecular precursors, widen the perspectives to achieve sustainable materials. Besides, the exploration of the tribochemical interactions between the DLC surface and lubricants containing biobased materials arises as a promising strategy to achieve green superlubricity as a viable and scalable process, through different pathways: by hydrogen bonds between lubricant and additives, via surface passivation of the functional groups present in these biomacromolecules or by biomimicking natural joints.Green Chemistry Letters and Reviews1751-82531751-7192142356379Published5leha1279su2021-06-172022-12-09diva2:1568061refereedrefRefereedRefereegranskatFagfellevurdertarticleartArticle in journalArtikel i tidskriftArtikkel i tidsskriftarticleA. da CruzMarcia GabrielyautStockholms universitet, Institutionen för material- och miljökemi (MMK)orcid.org=0000-0002-0357-0012diva-portal.org=authority-person:86716M. RodriguesBruno V.autStockholms universitet, Institutionen för material- och miljökemi (MMK)diva-portal.org=authority-person:86717RisticAndjelkaautBudnykSerhiyautDasShoubhikautorcid.org=0000-0002-4577-438Xdiva-portal.org=authority-person:92970SlabonAdamautStockholms universitet, Institutionen för material- och miljökemi (MMK)orcid.org=0000-0002-4452-1831diva-portal.org=authority-person:84424Stockholms universitetNaturvetenskapliga fakultetenInstitutionen för material- och miljökemi (MMK)pblOn the product selectivity in the electrochemical reductive cleavage of 2-phenoxyacetophenone, a lignin model compoundeng20222022-01-27T09:02:00https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-20136110.1080/17518253.2022.2025462000743057700001https://doi.org/10.1080/17518253.2022.2025462textLignin valorizationelectrocatalyzed depolymerizationlignin model compoundNatural SciencesChemical SciencesNaturvetenskapKemiResearch towards the production of renewable chemicals for fuel and energy industries has found lignin valorization as key. With a high carbon content and aromaticity, a fine-tuning of the depolymerization process is required to convert lignin into valuable chemicals. In context, model compounds have been used to understand the electrocatalyzed depolymerization for mimicking the typical linkages of lignin. In this investigation, 2-phenoxyacetophenone, a model compound for lignin beta-O-4 linkage, was electro-catalytically hydrogenated (ECH) in distinct three-electrode setups: an open and a membrane cell. A deep eutectic solvent based on ethylene-glycol and choline chloride was used to pursue sustainable routes to dissolve lignin. Copper was used as electrocatalyst due to the economic feasibility and low activity towards hydrogen evolution reaction (HER), a side reaction of ECH. By varying the cell type, we demonstrate a simple ECH route for the generation of different monomers and oligomers from lignin. Gas chromatography of the products revealed a higher content of carbonyl groups in those using the membrane cell, whereas the open cell produced mostly hydroxyl-end chemicals. Aiming at high value-added products, our results disclose the cell type influence on electrochemical reductive depolymerization of lignin. This approach encompasses cheap transition metal electrodes and sustainable solvents.Green Chemistry Letters and Reviews1751-82531751-7192151151159Published6leha1279su2022-01-272022-12-09diva2:1632494refereedrefRefereedRefereegranskatFagfellevurdertarticleartArticle in journalArtikel i tidskriftArtikkel i tidsskriftarticleA. da CruzMárcia G.autStockholms universitet, Institutionen för material- och miljökemi (MMK)orcid.org=0000-0002-0357-0012diva-portal.org=authority-person:86716GueretRobinautStockholms universitet, Institutionen för material- och miljökemi (MMK)orcid.org=0000-0002-7425-5423diva-portal.org=authority-person:94318ChenJianhongautStockholms universitet, Institutionen för material- och miljökemi (MMK)diva-portal.org=authority-person:94624PiątekJędrzejautStockholms universitet, Institutionen för material- och miljökemi (MMK)orcid.org=0000-0002-1429-4586diva-portal.org=authority-person:86202BeeleBjörnautSipponenMika H.autStockholms universitet, Institutionen för material- och miljökemi (MMK)orcid.org=0000-0001-7747-9310diva-portal.org=authority-person:83781FrauscherMarcellaautBudnykSerhiyautM. RodriguesBruno V.autStockholms universitet, Institutionen för material- och miljökemi (MMK)Bergische Universität Wuppertal, Germanyorcid.org=0000-0002-0130-8029diva-portal.org=authority-person:86717SlabonAdamautStockholms universitet, Institutionen för material- och miljökemi (MMK)Bergische Universität Wuppertal, Germanyorcid.org=0000-0002-4452-1831diva-portal.org=authority-person:84424Stockholms universitetNaturvetenskapliga fakultetenInstitutionen för material- och miljökemi (MMK)pblElectrochemical Depolymerization of Lignin in a Biomass-based Solventeng20222022-08-02T10:16:00https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-20761310.1002/cssc.202200718356087980008143005000012-s2.0-85132441743e202200718https://doi.org/10.1002/cssc.202200718textcoatingdepolymerizationelectrocatalysislevulinic acidligninNatural SciencesChemical SciencesNaturvetenskapKemiBreaking down lignin into smaller units is the key to generate high value-added products. Nevertheless, dissolving this complex plant polyphenol in an environment-friendly way is often a challenge. Levulinic acid, which is formed during the hydrothermal processing of lignocellulosic biomass, has been shown to efficiently dissolve lignin. Herein, levulinic acid was evaluated as a medium for the reductive electrochemical depolymerization of the lignin macromolecule. Copper was chosen as the electrocatalyst due to the economic feasibility and low activity towards the hydrogen evolution reaction. After depolymerization, high-resolution mass spectrometry and nuclear magnetic resonance spectroscopy revealed lignin-derived monomers and dimers. A predominance of aryl ether and phenolic groups was observed. Depolymerized lignin was further evaluated as an anti-corrosion coating, revealing enhancements on the electrochemical stability of the metal. Via a simple depolymerization process of biomass waste in a biomass-based solvent, a straightforward approach to produce high value-added compounds or tailored biobased materials was demonstrated. ChemSusChem1864-56311864-564X1515Published10albo5064su2022-08-022022-09-27diva2:1685235refereedrefRefereedRefereegranskatFagfellevurdertarticleartArticle in journalArtikel i tidskriftArtikkel i tidsskriftarticleA. da CruzMárcia G.autStockholms universitet, Institutionen för material- och miljökemi (MMK)orcid.org=0000-0002-0357-0012diva-portal.org=authority-person:86716OnwumereJoy N.autStockholms universitet, Institutionen för material- och miljökemi (MMK)orcid.org=0000-0002-6889-0527diva-portal.org=authority-person:94623ChenJianhongautStockholms universitet, Institutionen för material- och miljökemi (MMK)diva-portal.org=authority-person:94624BeeleBjörnautYaremaMaksymautBudnykSerhiyautSlabonAdamautStockholms universitet, Institutionen för material- och miljökemi (MMK)University of Wuppertal, Germanyorcid.org=0000-0002-4452-1831diva-portal.org=authority-person:84424M. RodriguesBruno V.autStockholms universitet, Institutionen för material- och miljökemi (MMK)University of Wuppertal, Germanyorcid.org=0000-0002-0130-8029diva-portal.org=authority-person:86717Stockholms universitetNaturvetenskapliga fakultetenInstitutionen för material- och miljökemi (MMK)pblSolvent-free synthesis of photoluminescent carbon nanoparticles from lignin-derived monomers as feedstockeng20232023-05-15T08:42:25https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-21690210.1080/17518253.2023.21960310009640206000012-s2.0-851523805912196031https://doi.org/10.1080/17518253.2023.2196031textElectrocatalysislignin depolymerizationcarbon nanoparticlescarbon dotsGreen & Sustainable Science & TechnologyNatural SciencesChemical SciencesNaturvetenskapKemiPhotoluminescent carbon nanoparticles (CNPs), such as carbon dots (CDs), have attracted much attention owing to a unique set of properties, like high and tunable fluorescence. In this way, the use of carbon-rich lignin has been demonstrated to be a sustainable approach to producing a broad range of photoluminescent CNPs. However, the valorization of this complex polyphenol is limited when it comes to green and efficient ways of conversion. In addition, the existing solvothermal approaches using lignin often result in CDs with low photoluminescence, while flammable and/or toxic solvents are employed. Here, we depolymerized technical lignins, i.e. kraft and soda, through electroreductive cleavage in two different sustainable media: deep eutectic solvent and levulinic acid. After depolymerization, lignin-derived monomers were generated, with a predominance of aryl ether and phenolic groups, which were further combined with 1,2-Phenylenediamine to produce N-doped CNPs in a solvent-free approach. Photoluminescent CNPs with varied sizes were generated (5–50 nm), which presented a wide photoluminescence emission, from blue to red, depending on solvent polarity. These results demonstrate a feasible and sustainable route for the solvent-free synthesis of photoluminescent CNPs using lignin-derived monomers as carbon source, which may find applications in a wide range of fields.Green Chemistry Letters and Reviews1751-82531751-7192161Published8gramcwsu2023-05-152023-05-15diva2:1756763studentThesisStudent thesisStudentuppsats (Examensarbete)OppgavebookA. KaderRoweidaautStockholms universitet, Institutionen för socialt arbeteAbdullahi AliKausarautStockholms universitet, Institutionen för socialt arbeteWahlinLottiethsStockholms universitet, Institutionen för socialt arbeteEkendahlMatsmonStockholms universitet, Institutionen för socialt arbeteStockholms universitetSamhällsvetenskapliga fakultetenInstitutionen för socialt arbetepblHör inget, ser inget och säger ingetEn kvalitativ undersökning om idéburna organisationers syn på obenägenheten att avlägga vittnesmål i marginaliserade områdenswe2020VT 20202020-07-02T16:00:0169https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-183183textNon-profit organizationsmarginalized areassocial exclusionviolenceterritorial stigmatizationIdéburna organisationermarginaliserade områdensocial utestängningvåldterritoriell stigmatiseringSocial SciencesSociologySocial WorkSamhällsvetenskapSociologiSocialt arbeteResidents in marginalized areas tend to show a lower level of confidence in the criminal justice system and carry out police reports and testimonies to the criminal justice system to a lesser extent than residents in other areas. In this scientific essay, a qualitative study is conducted to analyze the disinclination to leave testimonies and report crimes in marginalized areas, along with researching possible ways to improve the residents relationship with the criminal justice system. The theoretical framework for this study consists of Žižeks theory of violence, territorial stigma and social exclusion. The sample group for the study is advocates in non-profit organizations operating in marginalized areas. Using a semi-structured interview method, this study’s empirical findings reveals that a critical view of the criminal justice system, lack of confidence in the criminal justice system, ambivalent feelings about the residential area and mass medias stigmatizing effects are believed to cause a reluctance to cooperate with the criminal justice system in marginalized areas. Furthermore, our findings show that an admittance of the existence of racism within the justice system, increased communication, cultural competence, and safe meeting places are believed to improve the relationship between the residents and the criminal justice system.Självständigt arbete på grundnivå (högskoleexamen)10 poäng / 15 hphttps://su.diva-portal.org/smash/get/diva2:1446743/FULLTEXT01.pdfroab7148su2020-06-242020-07-02diva2:1446743refereedrefRefereedRefereegranskatFagfellevurdertarticleartArticle in journalArtikel i tidskriftArtikkel i tidsskriftarticleA. MadsenKevinautJ. BergholtzEmilautStockholms universitet, Fysikumorcid.org=0000-0002-9739-2930diva-portal.org=authority-person:85437BrouwerPiet W.autStockholms universitetNaturvetenskapliga fakultetenFysikumpblJosephson effect in a Weyl SNS junctioneng20172017-04-18T19:06:00https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-14141010.1103/PhysRevB.95.0645110003943686000072-s2.0-85013076996064511https://arxiv.org/abs/1612.03734textNatural SciencesPhysical SciencesNaturvetenskapFysikWe calculate the Josephson current density j (phi) for a Weyl superconductor-normal-metal-superconductor junction for which the outer terminals are superconducting Weylmetals and the normal layer is a Weyl (semi) metal. We describe the Weyl (semi) metal using a simple model with two Weyl points. The model has broken time-reversal symmetry, but inversion symmetry is present. We calculate the Josephson current for both zero and finite temperature for the two pairing mechanisms inside the superconductors that have been proposed in the literature, zero-momentum BCS-like pairing and finite-momentum FFLO-like pairing, and assuming the short-junction limit. For both pairing types we find that the current is proportional to the normal-state junction conductivity, with a proportionality coefficient that shows quantitative differences between the two pairing mechanisms. The current for the BCS-like pairing is found to be independent of the chemical potential, whereas the current for the FFLO-like pairing is not.Physical Review B2469-99502469-9969956Published3leha1279su2017-04-182022-10-20diva2:1089177sciencevetOther academicÖvrigt vetenskapligtAnnet vitenskapeligcomprehensiveDoctoralThesisdokDoctoral thesis, comprehensive summaryDoktorsavhandling, sammanläggningDoktoravhandling, med artiklerdissertationA. MannehIlana1970-autStockholms universitet, Institutionen för matematikämnets och naturvetenskapsämnenas didaktikorcid.org=0000-0003-0712-0681diva-portal.org=authority-person:99723HamzaKarimAssociate ProfessorthsStockholms universitet, Institutionen för matematikämnets och naturvetenskapsämnenas didaktikRundgrenCarl-JohanAssociate ProfessorthsStockholms universitet, Institutionen för matematikämnets och naturvetenskapsämnenas didaktikErikssonLarsAssociate ProfessorthsStockholms universitet, Institutionen för material- och miljökemi (MMK)EilksIngoProfessoropnInstitute for Science Education, University of Bremen, GermanyStockholms universitetNaturvetenskapliga fakultetenInstitutionen för matematikämnets och naturvetenskapsämnenas didaktikpblSupporting Learning and Teaching of Chemistry in the Undergraduate ClassroomengStockholmDepartment of Mathematics and Science Education, Stockholm University20192019-02-22T10:00:002019-01-30T09:00:0070978-91-7797-538-0978-91-7797-539-7https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-163805textDoctoral thesis from the department of mathematics and science education830020undergraduate chemistry educationlearning and teaching processesdidactic trianglechemical bondingtutor-student interactionpractical epistemology analysiscontinuityprogressionpurposesSocial SciencesEducational SciencesDidacticsSamhällsvetenskapUtbildningsvetenskapDidaktiknaturvetenskapsämnenas didaktikResearch subjectScience EducationResearch subjectThere is agreement in research about the need to find better ways of teaching chemistry to enhance students’ understanding. This thesis aims to contribute to the understanding of how we better support teaching and learning of undergraduate chemistry to make it meaningful and intelligible for students from the outset. The thesis is concerned with examining the interactions between student, specific content and teacher in the undergraduate chemistry classroom; that is, the processes making up the three relations of the didactic triangle. The data consists of observations of students and tutors during problem-solving activities in an introductory chemistry course and interviews with graduate students.Systematic analyses of the different interactions between the student, the chemistry content, and the tutor are made using the analytical tool of practical epistemology analysis. The main findings of the thesis include detailed insights into how undergraduate chemistry students deal with newly encountered content together with didactic models and concrete suggestions for improved teaching and for supporting continuity and progression in the undergraduate chemistry classroom. Specifically, I show how students deal with the chemistry content through a complex interaction of knowledge, experiences, and purposes on different levels invoked by both students and tutors as they interact with each other. Whether these interactions have a positive or negative effect on students’ learning depends on the nature of knowledge, experiences and purposes that were invoked. Moreover, the tutor sometimes invoked other purposes than the ones related to the task at hand for connecting the activity to the subject matter in general. These purposes were not always made continuous with the activity which resulting in confusion among students. The results from these analyses were used for producing hypotheses and models that could support continuity and progression during the activity. The suggested models aim to make the content more manageable and meaningful to students, enabling connections to other experiences and purposes, and helping teachers and tutors to analyze and reflect on their teaching. Moreover, a purpose- and activity-based progression is suggested that gives attention to purposes in chemistry education other than providing explanations of chemical phenomena. The aim of this ‘progression in action’ is to engage students in activities were they can see the meaning of chemical concepts and ideas through their use to accomplish different chemical tasks. A general conclusion is that detailed knowledge about the processes of teaching and learning is important for providing adequate support to both undergraduate students and university teachers in the chemistry classroom.At the time of the doctoral defense, the following papers were unpublished and had a status as follows: Paper 3: Accepted. Paper 4: Manuscript.Härtill 4 uppsatserDiss. (sammanfattning) Stockholm : Stockholms universitet, 2019filosofie doktorsexamenDoctor philosophiaeDegree of Doctor of Philosophydoctorat ès lettresengVivi Täckholmsalen (Q-salen), NPQ-huset, Svante Arrhenius väg 20, Stockholmhttps://su.diva-portal.org/smash/get/diva2:1277159/PREVIEW01.jpghttps://su.diva-portal.org/smash/get/diva2:1277159/FULLTEXT01.pdfilka0295su2019-01-092022-02-26diva2:1277159sciencevetOther academicÖvrigt vetenskapligtAnnet vitenskapeligmanuscriptovrManuscript (preprint)Manuskript (preprint)Manuskript (preprint)preprintA. MannehIlanaautStockholms universitet, Institutionen för matematikämnets och naturvetenskapsämnenas didaktikorcid.org=0000-0003-0712-0681diva-portal.org=authority-person:99723HamzaKarim M.autStockholms universitet, Institutionen för matematikämnets och naturvetenskapsämnenas didaktikdiva-portal.org=authority-person:88717RundgrenCarl-JohanautStockholms universitet, Institutionen för matematikämnets och naturvetenskapsämnenas didaktikdiva-portal.org=authority-person:86765ErikssonLarsautStockholms universitet, Institutionen för material- och miljökemi (MMK)orcid.org=0000-0001-7947-3860diva-portal.org=authority-person:85981Stockholms universitetNaturvetenskapliga fakultetenInstitutionen för matematikämnets och naturvetenskapsämnenas didaktikpblStockholms universitetNaturvetenskapliga fakultetenInstitutionen för material- och miljökemi (MMK)pblProgression in action for developing chemical knowledgeeng2018-12-21T13:34:00https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-163334textbasicsexplanationsprogressionpurposesundergraduate chemistrySocial SciencesEducational SciencesSamhällsvetenskapUtbildningsvetenskapnaturvetenskapsämnenas didaktikResearch subjectScience EducationResearch subjectIn this paper, we discuss the well-known teaching challenge of how to provide undergraduate students with basic chemistry knowledge without making them experience these basics as meaningless and unintelligible. First, we situate the challenge in a classic dilemma: should we teach the necessary basic facts before the chemical explanations or should the explanations be taught before or in parallel to these facts? Here we draw on examples from interviews with graduate students reflecting on their experiences regarding their studies at the undergraduate level. Second, we suggest a way out of the dilemma, through a shift in perspective from the typical progression of facts and explanations towards a purpose and activity-based progression. We conclude with a discussion of implications of such a shift for university chemistry education together with suggestions for future research.ilka0295su2018-12-212022-02-26diva2:1273640refereedrefRefereedRefereegranskatFagfellevurdertarticleartArticle in journalArtikel i tidskriftArtikkel i tidsskriftarticleA. MannehIlanaautStockholms universitet, Institutionen för matematikämnets och naturvetenskapsämnenas didaktikorcid.org=0000-0003-0712-0681diva-portal.org=authority-person:99723HamzaKarimautStockholms universitet, Institutionen för matematikämnets och naturvetenskapsämnenas didaktikdiva-portal.org=authority-person:88717RundgrenCarl-JohanautStockholms universitet, Institutionen för matematikämnets och naturvetenskapsämnenas didaktikdiva-portal.org=authority-person:86765ErikssonLarsautStockholms universitet, Institutionen för material- och miljökemi (MMK)orcid.org=0000-0001-7947-3860diva-portal.org=authority-person:85981Stockholms universitetNaturvetenskapliga fakultetenInstitutionen för matematikämnets och naturvetenskapsämnenas didaktikpblStockholms universitetNaturvetenskapliga fakultetenInstitutionen för material- och miljökemi (MMK)pblThe role of anthropomorphisms in students’ reasoning about chemical structure and bondingeng20182019-01-09T10:42:00https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-1638004https://www.eduhk.hk/apfslt/textAnthropomorphismchemical bondingchemistry educationexplanationsSocial SciencesEducational SciencesDidacticsSamhällsvetenskapUtbildningsvetenskapDidaktiknaturvetenskapsämnenas didaktikResearch subjectScience EducationResearch subjectAnthropomorphisms are widespread at all levels of the educational system even among science experts. This has led to a shift in how anthropomorphisms are viewed in science education, from a discussion of whether they should be allowed or avoided towards an interest in their role in supporting students’ understanding of science. In this study we examine the role of anthropomorphisms in supporting students’ understanding of chemistry. We analyze examples from undergraduate students’ discussions during problem-solving classes through the use of practical epistemology analysis (PEA). Findings suggest that students invoked anthropomorphisms alongside technical relations which together produced more or less chemically appropriate explanations. Also, anthropomorphisms constitute potentially productive points of departure for rendering students’ explanations more chemically appropriate. The implications of this study refer to the need to deal with anthropomorphisms explicitly and repeatedly as well as to encourage explicit connections between different parts of the explanation - teleological as well as causal.Asia-Pacific Forum on Science Learning and Teaching1609-4913192Publishedhttps://su.diva-portal.org/smash/get/diva2:1276859/FULLTEXT01.pdfilka0295su2019-01-092023-10-23diva2:1276859refereedrefRefereedRefereegranskatFagfellevurdertarticleartArticle in journalArtikel i tidskriftArtikkel i tidsskriftarticleA. MannehIlana1970-autStockholms universitet, Institutionen för matematikämnets och naturvetenskapsämnenas didaktikorcid.org=0000-0003-0712-0681diva-portal.org=authority-person:99723RundgrenCarl-JohanautStockholms universitet, Institutionen för matematikämnets och naturvetenskapsämnenas didaktikdiva-portal.org=authority-person:86765HamzaKarim M.autStockholms universitet, Institutionen för matematikämnets och naturvetenskapsämnenas didaktikdiva-portal.org=authority-person:88717ErikssonLarsautStockholms universitet, Institutionen för material- och miljökemi (MMK)orcid.org=0000-0001-7947-3860diva-portal.org=authority-person:85981Stockholms universitetNaturvetenskapliga fakultetenInstitutionen för matematikämnets och naturvetenskapsämnenas didaktikpblStockholms universitetNaturvetenskapliga fakultetenInstitutionen för material- och miljökemi (MMK)pblTutor-student interaction in undergraduate chemistrya case of learning to make relevant distinctions of molecular structures for determining oxidation states of atomseng20182018-12-21T10:59:00https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-16305210.1080/09500693.2018.1517423000449969800005https://doi.org/10.1080/09500693.2018.1517423textChemistry educationproblem solvingtutor-student interactionSocial SciencesEducational SciencesDidacticsSamhällsvetenskapUtbildningsvetenskapDidaktiknaturvetenskapsämnenas didaktikResearch subjectScience EducationResearch subjectIn this study, we explore the issues and challenges involved in supporting students’ learning to discern relevant and critical aspects of determining oxidation states of atoms in complex molecules. We present a detailed case of an interaction between three students and a tutor during a problem-solving class, using the analytical tool of practical epistemology analysis (PEA). The results show that the ability to make relevant distinctions between the different parts of a molecule for solving the problem, even with the guidance of the tutor, seemed to be challenging for students. These shifts were connected to both purposes that were specific for solving the problem at hand, and additional purposes for general learning of the subject matter, in this case how to assign oxidation states in molecules. The students sometimes could not follow the additional purposes introduced by the tutor, which made the related distinctions more confusing. Our results indicate that in order to provide adequate support and guidance for students the tutor needs to consider how to sequence, move between, and productively connect the different purposes introduced in a tutor-student interaction. One way of doing that is by first pursuing the purposes for solving the problem and then successively introduce additional, more general purposes for developing students’ learning of the subject matter studied. Further recommendations drawn from this study are discussed as well.International Journal of Science Education0950-06931464-5289401620232043Publishedhttps://su.diva-portal.org/smash/get/diva2:1273481/FULLTEXT01.pdfilka0295su2018-12-212022-03-23diva2:1273481refereedrefRefereedRefereegranskatFagfellevurdertarticleartArticle in journalArtikel i tidskriftArtikkel i tidsskriftarticleA. ViggianoAautM. Midey and A. EhlerdingAautKinetics of the reactions of ONOO- with small moleculeseng20062008-01-15T12:00:00https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-12464textInternational journal of mass spectrometry25565Publishedmigrationsu2008-01-152011-01-11diva2:178984refereedrefRefereedRefereegranskatFagfellevurdertarticleartArticle in journalArtikel i tidskriftArtikkel i tidsskriftarticleA. ZheltukhinAautStockholms universitet, FysikumkofkofothResearch GroupStockholms universitetNaturvetenskapliga fakultetenFysikumpblUnification of twistors and Ramond vectorseng20072008-01-15T12:00:00https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-12439000251895400014http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TVN-4R063VP-F&_user=2195977&_coverDate=12%2F13%2F2007&_rdoc=1&_fmt=&_orig=search&_sort=d&view=c&_acct=C000035218&_version=1&_urlVersion=0&_userid=2195977&md5=5df10f965ef50b529056c026c1c2319etextPhysics letters B65882Publishedmigrationsu2008-01-152011-01-11diva2:178959refereedrefRefereedRefereegranskatFagfellevurdertarticleartArticle in journalArtikel i tidskriftArtikkel i tidsskriftarticleAabergeRolfautBourguignonFrançoisautBrandoliniAndreaautFerreiraFrancisco H. G.autGornickJanet G.autHillsJohnautJänttiMarkusautStockholms universitet, Institutet för social forskning (SOFI)JenkinsStephen P.autMarlierEricautMicklewrightJohnautNolanBrianautPikettyThomasautRadermacherWalter J.autSmeedingTimothy M.autSternNicholas H.autStiglitzJosephautSutherlandHollyautStockholms universitetSamhällsvetenskapliga fakultetenInstitutet för social forskning (SOFI)pblTony Atkinson and his Legacyeng20172017-09-26T08:16:00https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-14738110.1111/roiw.12335000409875600001textAnthony B. Atkinsoninequalitypovertypublic economicseconomic theoryeconomic policySocial SciencesEconomics and BusinessEconomicsSamhällsvetenskapEkonomi och näringslivNationalekonomiTony Atkinson is universally celebrated for his outstanding contributions to the measurement and analysis of inequality, but he never saw the study of inequality as a separate branch of economics. He was an economist in the classical sense, rejecting any sub-field labelling of his interests and expertise, and he made contributions right across economics. His death on 1 January 2017 deprived the world of both an intellectual giant and a deeply committed public servant in the broadest sense of the term. This collective tribute highlights the range, depth and importance of Tony's enormous legacy, the product of almost fifty years’ work.The Review of Income and Wealth0034-65861475-4991633411444Publishedobacksu2017-09-262017-10-16diva2:1144274sciencevetOther academicÖvrigt vetenskapligtAnnet vitenskapeligreportrapReportRapportRapportbookAadG.autAbbottB.autAbdallahJ.autGellerstedtKarlautStockholms universitet, Fysikumdiva-portal.org=authority-person:87891Stockholms universitetNaturvetenskapliga fakultetenFysikumpblMeasurement of the top quark pair production cross section with ATLAS in pp collisions at √s = 7 TeV in dilepton final stateseng20112012-08-30T13:22:0027https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-79226textNatural SciencesPhysical SciencesSubatomic PhysicsNaturvetenskapFysikSubatomär fysikfysikResearch subjectPhysicsResearch subjectA measurement is presented of the production cross section of top quark pairs (σ_{\ttbar{}}) in proton-proton (pp) collisions at √s = 7 TeV recorded with the ATLAS detector at the CERN Large Hadron Collider. Using a data sample of 35 pb−1, candidate events are selected in the dilepton topology with large missing transverse energy, \met{}, and at least two jets.A baseline analysis employing kinematic properties of the candidate events to separate the signal from background and using data-driven techniques to determine the most important backgrounds, results in a measurement ofσ_{\ttbar{}} = 173 ± 22(stat.)+18 −16(syst.)+8 −7(lum.) pb,where the three uncertainties are from statistics, systematics and integrated luminosity, respectively.We also perform a cross section measurement requiring at least one b-tagged jet and a looser kinematic selection that increases the signal-to-background ratio, yieldingσ_{\ttbar{}} = 171 ± 22(stat.)+21 -16(syst.)+7 −6(lum.) pb.Additional studies are performed to corroborate these measurements; a technique that normalizes the \ttbar{} signal yield to the measured rate of Z decays, a two-dimensional template shape fit using the \met{} vs the number of jets to simultaneously measure the production cross sections of \ttbar{}, WW and Z → ττ final states, and a simultaneous measurement of σ_{\ttbar{}} and the b-tagging efficiency using the distribution of the number of tagged jets in each event.All the measurements are in good agreement with each other and the Standard Model prediction.https://su.diva-portal.org/smash/get/diva2:548310/FULLTEXT01.pdfkargelsu2012-08-302022-02-24diva2:548310refereedrefRefereedRefereegranskatFagfellevurdertarticleartArticle in journalArtikel i tidskriftArtikkel i tidsskriftarticleAadG.autAndreanS. Y.autStockholms universitet, FysikumBackmanF.autStockholms universitet, FysikumBarranco NavarroL.autStockholms universitet, FysikumBohmC.autStockholms universitet, FysikumClementC.autStockholms universitet, FysikumDunneK.autStockholms universitet, FysikumHellmanS.autStockholms universitet, FysikumIngebretsen CarlsonT.autStockholms universitet, FysikumKimD. W.autStockholms universitet, FysikumLeeS.autStockholms universitet, FysikumLouX.autStockholms universitet, FysikumMilsteadD. A.autStockholms universitet, FysikumPasuwanP.autStockholms universitet, FysikumPereira SanchezL.autStockholms universitet, FysikumRichterS.autStockholms universitet, FysikumRiefelE. M.autStockholms universitet, FysikumSilversteinS. B.autStockholms universitet, FysikumSjölinJ.autStockholms universitet, FysikumStrandbergS.autStockholms universitet, FysikumStrubigA.autStockholms universitet, FysikumValdes SanturioE.autStockholms universitet, FysikumZwalinskiL.autStockholms universitetNaturvetenskapliga fakultetenFysikumpblA search for top-squark pair production, in final states containing a top quark, a charm quark and missing transverse momentum, using the 139 fb−1 of pp collision data collected by the ATLAS detectoreng20242025-01-27T12:11:00https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-23844010.1007/JHEP07(2024)2500014267909000012-s2.0-85200565461250https://doi.org/10.1007/JHEP07(2024)250textBeyond Standard ModelHadron-Hadron ScatteringSupersymmetryNatural SciencesPhysical SciencesSubatomic PhysicsNaturvetenskapFysikSubatomär fysikThis paper presents a search for top-squark pair production in final states with a top quark, a charm quark and missing transverse momentum. The data were collected with the ATLAS detector during LHC Run 2 and correspond to an integrated luminosity of 139 fb−1 of proton-proton collisions at a centre-of-mass energy of s = 13 TeV. The analysis is motivated by an extended Minimal Supersymmetric Standard Model featuring a non-minimal flavour violation in the second- and third-generation squark sector. The top squark in this model has two possible decay modes, either t~1→cχ~10 or t~1→tχ~10, where the χ~10 is undetected. The analysis is optimised assuming that both of the decay modes are equally probable, leading to the most likely final state of tc+ETmiss. Good agreement is found between the Standard Model expectation and the data in the search regions. Exclusion limits at 95% CL are obtained in the mt~1 vs. mχ~10 plane and, in addition, limits on the branching ratio of the t~1→tχ~10 decay as a function of m(t~1) are also produced. Top-squark masses of up to 800 GeV are excluded for scenarios with light neutralinos, and top-squark masses up to 600 GeV are excluded in scenarios where the neutralino and the top squark are almost mass degenerate.Journal of High Energy Physics (JHEP)1126-67081029-847920247Published2950lifa3973su2025-01-272025-10-02diva2:1931507refereedrefRefereedRefereegranskatFagfellevurdertarticleartArticle in journalArtikel i tidskriftArtikkel i tidsskriftarticleAadG.autAndreanS. Y.autStockholms universitet, FysikumBackmanF.autStockholms universitet, FysikumBarranco NavarroL.autStockholms universitet, FysikumBohmC.autStockholms universitet, FysikumClementC.autStockholms universitet, FysikumDunneK.autStockholms universitet, FysikumHellmanS.autStockholms universitet, FysikumIngebretsen CarlsonT.autStockholms universitet, FysikumKimD. W.autStockholms universitet, FysikumLeeS.autStockholms universitet, FysikumLouX.autStockholms universitet, FysikumMilsteadD. A.autStockholms universitet, FysikumPasuwanP.autStockholms universitet, FysikumPereira SanchezL.autStockholms universitet, FysikumRichterS.autStockholms universitet, FysikumRiefelE. M.autStockholms universitet, FysikumSilversteinS. B.autStockholms universitet, FysikumSjölinJ.autStockholms universitet, FysikumStrandbergS.autStockholms universitet, FysikumStrubigA.autStockholms universitet, FysikumValdes SanturioE.autStockholms universitet, FysikumZwalinskiL.autStockholms universitetNaturvetenskapliga fakultetenFysikumpblInclusive and differential cross-section measurements of tt¯Z production in pp collisions at s = 13 TeV with the ATLAS detector, including EFT and spin-correlation interpretationseng20242025-01-27T11:10:00https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-23845910.1007/JHEP07(2024)1630013946317000012-s2.0-85199420138163https://doi.org/10.1007/JHEP07(2024)163textHadron-Hadron ScatteringTop PhysicsNatural SciencesPhysical SciencesSubatomic PhysicsNaturvetenskapFysikSubatomär fysikMeasurements of both the inclusive and differential production cross sections of a top-quark-top-antiquark pair in association with a Z boson (tt¯Z) are presented. Final states with two, three or four isolated leptons (electrons or muons) are targeted. The measurements use the data recorded by the ATLAS detector in pp collisions at s = 13 TeV at the Large Hadron Collider during the years 2015–2018, corresponding to an integrated luminosity of 140 fb−1. The inclusive cross section is measured to be σtt¯Z = 0.86 ± 0.04 (stat.) ± 0.04 (syst.) pb and found to be in agreement with the most advanced Standard Model predictions. The differential measurements are presented as a function of a number of observables that probe the kinematics of the tt¯Z system. Both the absolute and normalised differential cross-section measurements are performed at particle level and parton level for specific fiducial volumes, and are compared with NLO+NNLL theoretical predictions. The results are interpreted in the framework of Standard Model effective field theory and used to set limits on a large number of dimension-6 operators involving the top quark. The first measurement of spin correlations in tt¯Z events is presented: the results are in agreement with the Standard Model expectations, and the null hypothesis of no spin correlations is disfavoured with a significance of 1.8 standard deviations.Journal of High Energy Physics (JHEP)1126-67081029-847920247Published2933lifa3973su2025-01-272025-10-02diva2:1931429refereedrefRefereedRefereegranskatFagfellevurdertarticleartArticle in journalArtikel i tidskriftArtikkel i tidsskriftarticleAadG.autAndreanS. Y.autStockholms universitet, FysikumBackmanF.autStockholms universitet, FysikumBarranco NavarroL.autStockholms universitet, FysikumBohmC.autStockholms universitet, FysikumClementC.autStockholms universitet, FysikumDunneK.autStockholms universitet, FysikumHellmanS.autStockholms universitet, FysikumIngebretsen CarlsonT.autStockholms universitet, FysikumKimD. W.autStockholms universitet, FysikumLeeS.autStockholms universitet, FysikumLouX.autStockholms universitet, FysikumMilsteadD. A.autStockholms universitet, FysikumPasuwanP.autStockholms universitet, FysikumPereira SanchezL.autStockholms universitet, FysikumRichterS.autStockholms universitet, FysikumRiefelE. M.autStockholms universitet, FysikumSilversteinS. B.autStockholms universitet, FysikumSjölinJ.autStockholms universitet, FysikumStrandbergS.autStockholms universitet, FysikumStrubigA.autStockholms universitet, FysikumValdes SanturioE.autStockholms universitet, FysikumZwalinskiL.autStockholms universitetNaturvetenskapliga fakultetenFysikumpblMeasurement and interpretation of same-sign W boson pair production in association with two jets in pp collisions at (Formula presented.) TeV with the ATLAS detectoreng20242025-01-29T14:49:51https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-23867610.1007/JHEP04(2024)0260012531581000012-s2.0-8519821073626https://doi.org/10.1007/JHEP04(2024)026textHadron-Hadron ScatteringVector Boson ProductionNatural SciencesPhysical SciencesAstronomy, Astrophysics and CosmologyNaturvetenskapFysikAstronomi, astrofysik och kosmologiThis paper presents the measurement of fiducial and differential cross sections for both the inclusive and electroweak production of a same-sign W-boson pair in association with two jets (W±W±jj) using 139 fb−1 of proton-proton collision data recorded at a centre-of-mass energy of s = 13 TeV by the ATLAS detector at the Large Hadron Collider. The analysis is performed by selecting two same-charge leptons, electron or muon, and at least two jets with large invariant mass and a large rapidity difference. The measured fiducial cross sections for electroweak and inclusive W±W±jj production are 2.92 ± 0.22 (stat.) ± 0.19 (syst.) fb and 3.38 ± 0.22 (stat.) ± 0.19 (syst.) fb, respectively, in agreement with Standard Model predictions. The measurements are used to constrain anomalous quartic gauge couplings by extracting 95% confidence level intervals on dimension-8 operators. A search for doubly charged Higgs bosons H±± that are produced in vector-boson fusion processes and decay into a same-sign W boson pair is performed. The largest deviation from the Standard Model occurs for an H±± mass near 450 GeV, with a global significance of 2.5 standard deviations.Journal of High Energy Physics (JHEP)1126-67081029-847920244Published2932lifa3973su2025-01-292025-01-29diva2:1932634refereedrefRefereedRefereegranskatFagfellevurdertarticleartArticle in journalArtikel i tidskriftArtikkel i tidsskriftarticleAadG.autAndreanS. Y.autStockholms universitet, FysikumBackmanF.autStockholms universitet, FysikumBarranco NavarroL.autStockholms universitet, FysikumBohmC.autStockholms universitet, FysikumClementC.autStockholms universitet, FysikumDunneK.autStockholms universitet, FysikumHellmanS.autStockholms universitet, FysikumIngebretsen CarlsonT.autStockholms universitet, FysikumKimD. W.autStockholms universitet, FysikumLeeS.autStockholms universitet, FysikumLouX.autStockholms universitet, FysikumMilsteadD. A.autStockholms universitet, FysikumPasuwanP.autStockholms universitet, FysikumPereira SanchezL.autStockholms universitet, FysikumRichterS.autStockholms universitet, FysikumRiefelE. M.autStockholms universitet, FysikumSilversteinS. B.autStockholms universitet, FysikumSjölinJ.autStockholms universitet, FysikumStrandbergS.autStockholms universitet, FysikumStrubigA.autStockholms universitet, FysikumValdes SanturioE.autStockholms universitet, FysikumZwalinskiL.autStockholms universitetNaturvetenskapliga fakultetenFysikumpblObservation of electroweak production of W+W− in association with jets in proton-proton collisions at s = 13 TeV with the ATLAS detectoreng20242025-01-27T11:57:00https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-23843910.1007/JHEP07(2024)2540014267543000012-s2.0-85200582636254https://doi.org/10.1007/JHEP07(2024)254textHadron-Hadron ScatteringNatural SciencesPhysical SciencesSubatomic PhysicsNaturvetenskapFysikSubatomär fysikA measurement of the production of W bosons with opposite electric charges in association with two jets is presented based on 140 fb−1 of data collected by the ATLAS detector in proton-proton collisions at s = 13 TeV. The analysis is sensitive to the scattering of W bosons, which is of particular interest in the ATLAS physics programme as it can be used to probe the electroweak symmetry breaking mechanism of the Standard Model. This signal is observed with a significance of 7.1 standard deviations above the background expectation, while 6.2 standard deviations were expected. The measured cross-section is determined in a signal-enriched fiducial volume and is found to be 2.7 ± 0.5 fb, which is consistent with the theoretical prediction of 2.20−0.13+0.14 fb.Journal of High Energy Physics (JHEP)1126-67081029-847920247Published2948lifa3973su2025-01-272025-10-02diva2:1931491refereedrefRefereedRefereegranskatFagfellevurdertarticleartArticle in journalArtikel i tidskriftArtikkel i tidsskriftarticleAadG.autAndreanS. Y.autStockholms universitet, FysikumBackmanF.autStockholms universitet, FysikumBarranco NavarroL.autStockholms universitet, FysikumBohmC.autStockholms universitet, FysikumClementC.autStockholms universitet, FysikumDunneK.autStockholms universitet, FysikumHellmanS.autStockholms universitet, FysikumIngebretsen CarlsonT.autStockholms universitet, FysikumKimD. W.autStockholms universitet, FysikumLeeS.autStockholms universitet, FysikumLouX.autStockholms universitet, FysikumMilsteadD. A.autStockholms universitet, FysikumPasuwanP.autStockholms universitet, FysikumPereira SanchezL.autStockholms universitet, FysikumRichterS.autStockholms universitet, FysikumRiefelE. M.autStockholms universitet, FysikumSilversteinS. B.autStockholms universitet, FysikumSjölinJ.autStockholms universitet, FysikumStrandbergS.autStockholms universitet, FysikumStrubigA.autStockholms universitet, FysikumValdes SanturioE.autStockholms universitet, FysikumZwalinskiL.autStockholms universitetNaturvetenskapliga fakultetenFysikumpblSearch for new particles in final states with a boosted top quark and missing transverse momentum in proton-proton collisions at s = 13 TeV with the ATLAS detectoreng20242025-01-29T14:52:43https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-23867210.1007/JHEP05(2024)2630012703384000012-s2.0-85197477787263https://doi.org/10.1007/JHEP05(2024)263textHadron-Hadron ScatteringNatural SciencesPhysical SciencesAstronomy, Astrophysics and CosmologyNaturvetenskapFysikAstronomi, astrofysik och kosmologiA search for events with one top quark and missing transverse momentum in the final state is presented. The fully hadronic decay of the top quark is explored by selecting events with a reconstructed boosted top-quark topology produced in association with large missing transverse momentum. The analysis uses 139 fb−1 of proton-proton collision data at a centre-of-mass energy of s = 13 TeV recorded during 2015-2018 by the ATLAS detector at the Large Hadron Collider. The results are interpreted in the context of simplified models for Dark Matter particle production and the single production of a vector-like T quark. Without significant excess relative to the Standard Model expectations, 95% confidence-level upper limits on the corresponding cross-sections are obtained. The production of Dark Matter particles in association with a single top quark is excluded for masses of a scalar (vector) mediator up to 4.3 (2.3) TeV, assuming mχ = 1 GeV and the model couplings λq = 0.6 and λχ = 0.4 (a = 0.5 and gχ = 1). The production of a single vector-like T quark is excluded for masses below 1.8 TeV assuming a coupling to the top quark κT = 0.5 and a branching ratio for T → Zt of 25%.Journal of High Energy Physics (JHEP)1126-67081029-847920245Published2934lifa3973su2025-01-292025-01-29diva2:1932637refereedrefRefereedRefereegranskatFagfellevurdertarticleartArticle in journalArtikel i tidskriftArtikkel i tidsskriftarticleAadG.autAndreanS. Y.autStockholms universitet, FysikumBackmanF.autStockholms universitet, FysikumBarranco NavarroL.autStockholms universitet, FysikumBohmC.autStockholms universitet, FysikumClementC.autStockholms universitet, FysikumDunneK.autStockholms universitet, FysikumHellmanS.autStockholms universitet, FysikumIngebretsen CarlsonT.autStockholms universitet, FysikumKimD. W.autStockholms universitet, FysikumLeeS.autStockholms universitet, FysikumLouX.autStockholms universitet, FysikumMilsteadD. A.autStockholms universitet, FysikumPasuwanP.autStockholms universitet, FysikumPereira SanchezL.autStockholms universitet, FysikumRichterS.autStockholms universitet, FysikumSilversteinS. B.autStockholms universitet, FysikumSjölinJ.autStockholms universitet, FysikumStrandbergS.autStockholms universitet, FysikumStrubigA.autStockholms universitet, FysikumValdes SanturioE.autStockholms universitet, FysikumZwalinskiL.autStockholms universitetNaturvetenskapliga fakultetenFysikumpblMeasurements of W+W− production cross-sections in pp collisions at s=13 TeV with the ATLAS detectoreng20252025-10-23T10:34:53https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-24838010.1007/JHEP08(2025)1422-s2.0-105018463986142https://doi.org/10.1007/JHEP08(2025)142textElectroweak InteractionHadron-Hadron ScatteringQCDNatural SciencesPhysical SciencesAstronomy, Astrophysics and CosmologyNaturvetenskapFysikAstronomi, astrofysik och kosmologiMeasurements of W+W− → e±νμ∓ν production cross-sections are presented, providing a test of the predictions of perturbative quantum chromodynamics and the electroweak theory. The measurements are based on data from pp collisions at s = 13 TeV recorded by the ATLAS detector at the Large Hadron Collider in 2015–2018, corresponding to an integrated luminosity of 140 fb−1. The number of events due to top-quark pair production, the largest background, is reduced by rejecting events containing jets with b-hadron decays. An improved methodology for estimating the remaining top-quark background enables a precise measurement of W+W− cross-sections with no additional requirements on jets. The fiducial W+W− cross-section is determined in a maximum-likelihood fit with an uncertainty of 3.1%. The measurement is extrapolated to the full phase space, resulting in a total W+W− cross-section of 127 ± 4 pb. Differential cross-sections are measured as a function of twelve observables that comprehensively describe the kinematics of W+W− events. The measurements are compared with state-of-the-art theory calculations and excellent agreement with predictions is observed. A charge asymmetry in the lepton rapidity is observed as a function of the dilepton invariant mass, in agreement with the Standard Model expectation. A CP-odd observable is measured to be consistent with no CP violation. Limits on Standard Model effective field theory Wilson coefficients in the Warsaw basis are obtained from the differential cross-sections.Journal of High Energy Physics (JHEP)1126-67081029-847920258Published2933lifa3973su2025-10-232025-10-23diva2:2008540refereedrefRefereedRefereegranskatFagfellevurdertarticleartArticle in journalArtikel i tidskriftArtikkel i tidsskriftarticleAadG.autAndreanS. Y.autStockholms universitet, FysikumBackmanF.autStockholms universitet, FysikumBarranco NavarroL.autStockholms universitet, FysikumBohmC.autStockholms universitet, FysikumClementC.autStockholms universitet, FysikumHellmanS.autStockholms universitet, FysikumKastanasA.autStockholms universitet, FysikumLouX.autStockholms universitet, FysikumMilsteadD. A.autStockholms universitet, FysikumMoaT.autStockholms universitet, FysikumNelsonM. E.autStockholms universitet, FysikumPasuwanP.autStockholms universitet, FysikumPereira SanchezL.autStockholms universitet, FysikumShaikhN. W.autStockholms universitet, FysikumSilversteinS. B.autStockholms universitet, FysikumSjölinJ.autStockholms universitet, FysikumStrandbergS.autStockholms universitet, FysikumValdes SanturioE.autStockholms universitet, FysikumWallangenV.autStockholms universitet, FysikumZwalinskiL.autStockholms universitetNaturvetenskapliga fakultetenFysikumpblSearch for pair-produced vectorlike quarks coupling to light quarks in the lepton plus jets final state using 13 TeV pp collisions with the ATLAS detectoreng20242025-01-14T09:22:00https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-23779710.1103/PhysRevD.110.0520090013817681000022-s2.0-85206153733052009https://doi.org/10.1103/PhysRevD.110.052009textNatural SciencesPhysical SciencesAstronomy, Astrophysics and CosmologyNaturvetenskapFysikAstronomi, astrofysik och kosmologiA search is presented for the pair production of heavy vectorlike quarks (VLQs) that each decay into a W boson and a light quark. This study focuses on events where one W boson decays into leptons and the other into hadrons. The search analyzed 140 fb−1 of pp collision data with pffiffi s ¼ 13 TeV, recorded by the ATLAS detector from 2015 to 2018 during run 2 of the Large Hadron Collider. The final state is characterized by a high-transverse-momentum isolated electron or muon, large missing transverse momentum, multiple small-radius jets, and a single large-radius jet identified as originating from the hadronic decay of a boosted W boson. With higher center-of-mass energy and integrated luminosity than in the run 1 search, and improved analysis tools, this analysis excludes VLQs (Q) with masses below 1530 GeV at 95% confidence level for the branching ratio BðQ → WqÞ ¼ 1, an improvement of 840 GeV on the previous ATLAS limit.Physical Review Dcovering particles, fields, gravitation, and cosmology2470-00102470-00291105Published2959lifa3973su2025-01-142025-10-02diva2:1927115refereedrefRefereedRefereegranskatFagfellevurdertarticleartArticle in journalArtikel i tidskriftArtikkel i tidsskriftarticleAadG.autAndreanS. Y.autStockholms universitet, FysikumBackmanF.autStockholms universitet, FysikumBohmC.autStockholms universitet, FysikumClementC.autStockholms universitet, FysikumDunneK.autStockholms universitet, FysikumHellmanS.autStockholms universitet, FysikumCarlsonT. IngebretsenautStockholms universitet, FysikumKimD. W.autStockholms universitet, FysikumLeeS.autStockholms universitet, FysikumLouX.autStockholms universitet, FysikumLouX.autStockholms universitet, FysikumMilsteadD. A.autStockholms universitet, FysikumMontellaA.autStockholms universitet, FysikumRichterS.autStockholms universitet, FysikumRiefelE. M.autStockholms universitet, FysikumSilversteinS. B.autStockholms universitet, FysikumSjolinJ.autStockholms universitet, FysikumStrandbergS.autStockholms universitet, FysikumStrubigA.autStockholms universitet, FysikumSanturioE. ValdesautStockholms universitet, FysikumZwalinskiL.autStockholms universitetNaturvetenskapliga fakultetenFysikumpblSearch for dark mesons decaying to top and bottom quarks in proton-proton collisions at √s=13 TeV with the ATLAS detectoreng20242025-10-22T11:57:55https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-24782110.1007/JHEP09(2024)0050014444992000012-s2.0-85207138076005https://doi.org/10.1007/JHEP09(2024)005textBeyond Standard ModelDark MatterExoticsHadron-Hadron ScatteringNatural SciencesPhysical SciencesSubatomic PhysicsNaturvetenskapFysikSubatomär fysikA search for dark mesons originating from strongly-coupled, SU(2) dark flavor symmetry conserving models and decaying gaugephobically to pure Standard Model final states containing top and bottom quarks is presented. The search targets fully hadronic final states and final states with exactly one electron or muon and multiple jets. The analyzed data sample corresponds to an integrated luminosity of 140 fb(-1) of proton-proton collisions collected at root s = 13 TeV with the ATLAS detector at the Large Hadron Collider. No significant excess over the Standard Model background expectation is observed and the results are used to set the first direct constraints on this type of model. The two-dimensional signal space of dark pion masses m(pi D) and dark rho-meson masses m(rho D) is scanned. For m(pi D)/m(rho D) = 0.45, dark pions with masses m(pi D)< 940 GeV are excluded at the 95% CL, while for m(pi D)/m(rho D) = 0.25 masses m(pi D)< 740 GeV are excluded.Journal of High Energy Physics (JHEP)1126-67081029-84799Published2900lifa3973su2025-10-222025-10-22diva2:2008260refereedrefRefereedRefereegranskatFagfellevurdertarticleartArticle in journalArtikel i tidskriftArtikkel i tidsskriftarticleAadG.autAndreanS. Y.autStockholms universitet, FysikumBackmanF.autStockholms universitet, FysikumBohmC.autStockholms universitet, FysikumClementC.autStockholms universitet, FysikumDunneK.autStockholms universitet, FysikumHellmanS.autStockholms universitet, FysikumCarlsonT. IngebretsenautStockholms universitet, FysikumKimD. W.autStockholms universitet, FysikumLeeS.autStockholms universitet, FysikumLouX.autStockholms universitet, FysikumLouX.autMilsteadD. A.autStockholms universitet, FysikumRichterS.autStockholms universitet, FysikumRiefelE. M.autStockholms universitet, FysikumSilversteinS. B.autStockholms universitet, FysikumSjölinJ.autStockholms universitet, FysikumStrandbergS.autStockholms universitet, FysikumStrubigA.autStockholms universitet, FysikumSanturioE. ValdesautStockholms universitet, FysikumZwalinskiL.autStockholms universitetNaturvetenskapliga fakultetenFysikumpblSearch for Light Long-Lived Particles in pp Collisions at √s=13 TeV Using Displaced Vertices in the ATLAS Inner Detectoreng20242025-10-10T12:18:55https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-24781810.1103/PhysRevLett.133.161803394859650013825406000012-s2.0-85195166241161803https://doi.org/10.1103/PhysRevLett.133.161803textNatural SciencesPhysical SciencesAstronomy, Astrophysics and CosmologyNaturvetenskapFysikAstronomi, astrofysik och kosmologiA search for long-lived particles (LLPs) using 140 fb(-1) of pp collision data with root s = 13 TeV recorded by the ATLAS experiment at the LHC is presented. The search targets LLPs with masses between 5 and 55 GeV that decay hadronically in the ATLAS inner detector. Benchmark models with LLP pair production from exotic decays of the Higgs boson and models featuring long-lived axionlike particles (ALPs) are considered. No significant excess above the expected background is observed. Upper limits are placed on the branching ratio of the Higgs boson to pairs of LLPs, the cross section for ALPs produced in association with a vector boson, and, for the first time, on the branching ratio of the top quark to an ALP and a u/c quark.Physical Review Letters0031-90071079-711413316Published2912lifa3973su2025-10-102025-10-10diva2:2005661refereedrefRefereedRefereegranskatFagfellevurdertreviewforArticle, review/surveyArtikel, forskningsöversiktArtikkel, forskningsoversiktarticleAadG.autAndreanS. Y.autStockholms universitet, FysikumBackmanF.autStockholms universitet, FysikumBohmC.autStockholms universitet, FysikumClementC.autStockholms universitet, FysikumDunneK.autStockholms universitet, FysikumHellmanS.autStockholms universitet, FysikumCarlsonT. IngebretsenautStockholms universitet, FysikumKimD. W.autStockholms universitet, FysikumLeeS.autStockholms universitet, FysikumLouX.autStockholms universitet, FysikumMilsteadD. A.autStockholms universitet, FysikumRichterS.autStockholms universitet, FysikumRiefelE. M.autStockholms universitet, FysikumSilversteinS. B.autStockholms universitet, FysikumSjolinJ.autStockholms universitet, FysikumStrandbergS.autStockholms universitet, FysikumStrubigA.autStockholms universitet, FysikumSanturioE. ValdesautStockholms universitet, FysikumZwalinskiL.autStockholms universitetNaturvetenskapliga fakultetenFysikumpblElectroweak, QCD and flavour physics studies with ATLAS data from Run 2 of the LHCeng20252025-10-22T12:04:00https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-24781510.1016/j.physrep.2024.12.0030014983026000012-s2.0-105001688068textNatural SciencesPhysical SciencesSubatomic PhysicsNaturvetenskapFysikSubatomär fysikA summary of precision measurements sensitive to electroweak, QCD and quark-flavour effects performed by the ATLAS Collaboration at the Large Hadron Collider is reported. The measurements are predominantly performed on proton-proton (pp) collision data recorded at a centre-of-mass energy of 13 TeV taken from 2015 to 2018, with an integrated luminosity of up to 140 fb(-1), with some results based on pp and Pb+Pb data recorded at lower nucleon centre-of-mass energies. The results cover a wide range of topics, from strong production of particles at low energies and the spectroscopy of hadrons to perturbative QCD with hadronic jets and electroweak and strong production of single and multiple vector bosons. They provide precise measurements of fundamental constants and stringent tests of the Standard Model with unprecedented precision and in energy ranges never explored before. They are also used to explore the proton structure and to perform model-independent searches for new physics. (c) 2024 CERN for the benefit of the ATLAS Collaboration. Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).Physics reports0370-15731873-6270111657126Published2855lifa3973su2025-10-222025-10-22diva2:2008269refereedrefRefereedRefereegranskatFagfellevurdertarticleartArticle in journalArtikel i tidskriftArtikkel i tidsskriftarticleAadG.autAndreanS. Y.autStockholms universitet, FysikumBackmanF.autStockholms universitet, FysikumBohmC.autStockholms universitet, FysikumClementC.autStockholms universitet, FysikumDunneK.autStockholms universitet, FysikumHellmanS.autStockholms universitet, FysikumCarlsonT. IngebretsenautStockholms universitet, FysikumKimD. W.autStockholms universitet, FysikumLeeS.autStockholms universitet, FysikumLouX.autStockholms universitet, FysikumMilsteadD. A.autStockholms universitet, FysikumRichterS.autStockholms universitet, FysikumRiefelE. M.autStockholms universitet, FysikumSilversteinS. B.autStockholms universitet, FysikumSjölinJ.autStockholms universitet, FysikumStrandbergS.autStockholms universitet, FysikumStrubigA.autStockholms universitet, FysikumSanturioE. ValdesautStockholms universitet, FysikumZwalinskiL.autStockholms universitetNaturvetenskapliga fakultetenFysikumpblMeasurements of the production cross-section for a Z boson in association with b- or c-jets in proton–proton collisions at s=13 TeV with the ATLAS detectoreng20242025-01-14T09:28:00https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-23779910.1140/epjc/s10052-024-13159-w0013946195000012-s2.0-85205704534984https://doi.org/10.1140/epjc/s10052-024-13159-wtextNatural SciencesPhysical SciencesAstronomy, Astrophysics and CosmologyNaturvetenskapFysikAstronomi, astrofysik och kosmologiThis paper presents a measurement of the production cross-section of a Z boson in association with b- or c-jets, in proton–proton collisions at s=13 TeV with the ATLAS experiment at the Large Hadron Collider using data corresponding to an integrated luminosity of 140 fb-1. Inclusive and differential cross-sections are measured for events containing a Z boson decaying into electrons or muons and produced in association with at least one b-jet, at least one c-jet, or at least two b-jets with transverse momentum pT>20 GeV and rapidity |y|<2.5. Predictions from several Monte Carlo generators based on next-to-leading-order matrix elements interfaced with a parton-shower simulation, with different choices of flavour schemes for initial-state partons, are compared with the measured cross-sections. The results are also compared with novel predictions, based on infrared and collinear safe jet flavour dressing algorithms. Selected Z+≥1c-jet observables, optimized for sensitivity to intrinsic-charm, are compared with benchmark models with different intrinsic-charm fractions.European Physical Journal C1434-60441434-6052849Published2904lifa3973su2025-01-142025-10-03diva2:1927118refereedrefRefereedRefereegranskatFagfellevurdertarticleartArticle in journalArtikel i tidskriftArtikkel i tidsskriftarticleAadG.autAndreanS. Y.autStockholms universitet, FysikumBackmanF.autStockholms universitet, FysikumBohmC.autStockholms universitet, FysikumClementC.autStockholms universitet, FysikumDunneK.autStockholms universitet, FysikumHellmanS.autStockholms universitet, FysikumCarlsonT. IngebretsenautStockholms universitet, FysikumKimD. W.autStockholms universitet, FysikumLeeS.autStockholms universitet, FysikumLouX.autStockholms universitet, FysikumMilsteadD. A.autStockholms universitet, FysikumRichterS.autStockholms universitet, FysikumRiefelE. M.autStockholms universitet, FysikumSilversteinS. B.autStockholms universitet, FysikumSjölinJ.autStockholms universitet, FysikumStrandbergS.autStockholms universitet, FysikumStrubigA.autStockholms universitet, FysikumSanturioE. ValdesautStockholms universitet, FysikumZwalinskiL.autStockholms universitetNaturvetenskapliga fakultetenFysikumpblSearch for flavour-changing neutral-current couplings between the top quark and the Higgs boson in multi-lepton final states in 13 TeV pp collisions with the ATLAS detectoreng20242025-01-27T12:14:00https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-23844110.1140/epjc/s10052-024-12994-10013946171000012-s2.0-85200554324757https://doi.org/10.1140/epjc/s10052-024-12994-1textNatural SciencesPhysical SciencesSubatomic PhysicsNaturvetenskapFysikSubatomär fysikA search is presented for flavour-changing neutral-current interactions involving the top quark, the Higgs boson and an up-type quark (q=u,c) with the ATLAS detector at the Large Hadron Collider. The analysis considers leptonic decays of the top quark along with Higgs boson decays into two W bosons, two Z bosons or a τ+τ- pair. It focuses on final states containing either two leptons (electrons or muons) of the same charge or three leptons. The considered processes are tt¯ and Ht production. For the tt¯ production, one top quark decays via t→Hq. The proton–proton collision data set analysed amounts to (140fb-1) at (s=13TeV). No significant excess beyond Standard Model expectations is observed and upper limits are set on the t→Hq branching ratios at 95 % confidence level, amounting to observed (expected) limits of B(t→Hu)<2.8(3.0)×10-4 and B(t→Hc)<3.3(3.8)×10-4. Combining this search with other searches for tHq flavour-changing neutral-current interactions previously conducted by ATLAS, considering H→bb¯ and H→γγ decays, as well as H→τ+τ- decays with one or two hadronically decaying τ-leptons, yields observed (expected) upper limits on the branching ratios of B(t→Hu)<2.6(1.8)×10-4 and B(t→Hc)<3.4(2.3)×10-4.European Physical Journal C1434-60441434-6052847Published2914lifa3973su2025-01-272025-10-02diva2:1931512refereedrefRefereedRefereegranskatFagfellevurdertarticleartArticle in journalArtikel i tidskriftArtikkel i tidsskriftarticleAadG.autAndreanS. Y.autStockholms universitet, FysikumBackmanF.autStockholms universitet, FysikumBohmC.autStockholms universitet, FysikumClementC.autStockholms universitet, FysikumDunneK.autStockholms universitet, FysikumHellmanS.autStockholms universitet, FysikumIngebretsen CarlsonT.autStockholms universitet, FysikumKimD. W.autStockholms universitet, FysikumLeeS.autStockholms universitet, FysikumLouX.autStockholms universitet, FysikumLouX.autStockholms universitet, FysikumMilsteadD. A.autStockholms universitet, FysikumRichterS.autStockholms universitet, FysikumRiefelE. M.autStockholms universitet, FysikumSilversteinS. B.autStockholms universitet, FysikumSjoelinJ.autStockholms universitet, FysikumStrandbergS.autStockholms universitet, FysikumStrubigA.autStockholms universitet, FysikumSanturioE. ValdesautStockholms universitet, FysikumWangZ.autStockholms universitetNaturvetenskapliga fakultetenFysikumpblSearch for supersymmetry in final states with missing transverse momentum and charm-tagged jets using 139 fb-1 of proton-proton collisions at √s=13 TeV with the ATLAS detectoreng20252025-10-22T12:00:48https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-24781410.1007/JHEP02(2025)193001489664600001193https://doi.org/10.1007/JHEP02(2025)193textHadron-Hadron ScatteringSupersymmetryNatural SciencesPhysical SciencesSubatomic PhysicsNaturvetenskapFysikSubatomär fysikThe paper presents a search for supersymmetric particles produced in proton-proton collisions at root s = 13TeV and decaying into final states with missing transverse momentum and jets originating from charm quarks. The data were taken with the ATLAS detector at the Large Hadron Collider at CERN from 2015 to 2018 and correspond to an integrated luminosity of 139 fb(-1). No significant excess of events over the expected Standard Model background expectation is observed in optimized signal regions, and limits are set on the production cross-sections of the supersymmetric particles. Pair production of charm squarks or top squarks, each decaying into a charm quark and the lightest supersymmetric particle (chi) over tilde (0)(1), is excluded at 95% confidence level for squarks with masses up to 900 GeV for scenarios where the mass of (chi) over tilde (0)(1) is below 50 GeV. Additionally, the production of leptoquarks with masses up to 900 GeV is excluded for the scenario where up-type leptoquarks decay into a charm quark and a neutrino. Model-independent limits on cross-sections and event yields for processes beyond the Standard Model are also reported.Journal of High Energy Physics (JHEP)1126-67081029-84792Published2917lifa3973su2025-10-222025-10-22diva2:2008264refereedrefRefereedRefereegranskatFagfellevurdertarticleartArticle in journalArtikel i tidskriftArtikkel i tidsskriftarticleAadG.autAndreanS. Y.autStockholms universitet, FysikumBackmanF.autStockholms universitet, FysikumBohmC.autStockholms universitet, FysikumClementC.autStockholms universitet, FysikumDunneK.autStockholms universitet, FysikumHellmanS.autStockholms universitet, FysikumIngebretsen CarlsonT.autStockholms universitet, FysikumKimD. W.autStockholms universitet, FysikumLeeS.autStockholms universitet, FysikumLouX.autStockholms universitet, FysikumMilsteadD. A.autStockholms universitet, FysikumMontellaA.autStockholms universitet, FysikumRichterS.autStockholms universitet, FysikumRiefelE. M.autStockholms universitet, FysikumSilversteinS. B.autStockholms universitet, FysikumSjoelinJ.autStockholms universitet, FysikumStrandbergS.autStockholms universitet, FysikumStrubigA.autStockholms universitet, FysikumValdes SanturioE.autStockholms universitet, FysikumZwalinskiL.autStockholms universitetNaturvetenskapliga fakultetenFysikumpblMeasurements of WH and ZH production with Higgs boson decays into bottom quarks and direct constraints on the charm Yukawa coupling in 13 TeV pp collisions with the ATLAS detectoreng20252025-10-22T11:53:42https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-24781610.1007/JHEP04(2025)075001489185400001075https://doi.org/10.1007/JHEP04(2025)075textHadron-Hadron ScatteringNatural SciencesPhysical SciencesSubatomic PhysicsNaturvetenskapFysikSubatomär fysikA study of the Higgs boson decaying into bottom quarks (H -> b (b) over bar) and charm quarks (H -> c (c) over bar) is performed, in the associated production channel of the Higgs boson with a W or Z boson, using 140 fb(-1) of proton-proton collision data at root s = 13 TeV collected by the ATLAS detector. The individual production of WH and ZH with H -> b (b) over bar is established with observed (expected) significances of 5.3 (5.5) and 4.9 (5.6) standard deviations, respectively. Differential cross-section measurements of the gauge boson transverse momentum within the simplified template cross-section framework are performed in a total of 13 kinematical fiducial regions. The search for the H -> c (c) over bar decay yields an observed (expected) upper limit at 95% confidence level of 11.5 (10.6) times the Standard Model prediction. The results are also used to set constraints on the charm coupling modifier, resulting in vertical bar kappa(c)vertical bar < 4.2 at 95% confidence level. Combining the H -> b<(b)over bar> and H -> c (c) over bar measurements constrains the absolute value of the ratio of Higgs-charm and Higgs-bottom coupling modifiers (vertical bar kappa(c)/kappa(b)vertical bar) to be less than 3.6 at 95% confidence level.Journal of High Energy Physics (JHEP)1126-67081029-84794Published2900lifa3973su2025-10-222025-10-22diva2:2008255refereedrefRefereedRefereegranskatFagfellevurdertarticleartArticle in journalArtikel i tidskriftArtikkel i tidsskriftarticleAadG.autAndreanS. Y.autStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)BackmanF.autStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)BohmC.autStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)ClementC.autStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)DunneK.autStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)HellmanS.autStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)Ingebretsen CarlsonT.autStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)KimD. W.autStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)LeeS.autStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)LouX.autStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)MilsteadD. A.autStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)MontellaA.autStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)RichterS.autStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)RiefelE. M.autStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)SilversteinS. B.autStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)SjölinJ.autStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)StrandbergS.autStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)StrubigA.autStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)Valdes SanturioE.autStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)ZwalinskiL.autStockholms universitetNaturvetenskapliga fakultetenOskar Klein-centrum för kosmopartikelfysik (OKC)pblSimultaneous energy and mass calibration of large-radius jets with the ATLAS detector using a deep neural networkeng20242025-01-16T14:52:00https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-23785110.1088/2632-2153/ad611e0013944936000012-s2.0-85203423356035051https://doi.org/10.1088/2632-2153/ad611etextATLAScalibrationsCERN jetsdetectorNatural SciencesPhysical SciencesAstronomy, Astrophysics and CosmologyNaturvetenskapFysikAstronomi, astrofysik och kosmologiThe energy and mass measurements of jets are crucial tasks for the Large Hadron Collider experiments. This paper presents a new calibration method to simultaneously calibrate these quantities for large-radius jets measured with the ATLAS detector using a deep neural network (DNN). To address the specificities of the calibration problem, special loss functions and training procedures are employed, and a complex network architecture, which includes feature annotation and residual connection layers, is used. The DNN-based calibration is compared to the standard numerical approach in an extensive series of tests. The DNN approach is found to perform significantly better in almost all of the tests and over most of the relevant kinematic phase space. In particular, it consistently improves the energy and mass resolutions, with a 30% better energy resolution obtained for transverse momenta pT > 500 GeV.Machine LearningScience and Technology2632-215353Published2912lifa3973su2025-01-162025-10-02diva2:1928309refereedrefRefereedRefereegranskatFagfellevurdertarticleartArticle in journalArtikel i tidskriftArtikkel i tidsskriftarticleAadG.autAndreanS. Y.autStockholms universitet, FysikumBackmanF.autStockholms universitet, FysikumBohmC.autStockholms universitet, FysikumClementC.autStockholms universitet, FysikumDunneK.autStockholms universitet, FysikumHellmanS.autStockholms universitet, FysikumIngebretsen CarlsonT.autStockholms universitet, FysikumKimD. W.autStockholms universitet, FysikumLeeS.autStockholms universitet, FysikumLouX.autStockholms universitet, FysikumMilsteadD. A.autStockholms universitet, FysikumRichterS.autStockholms universitet, FysikumRiefelE. M.autStockholms universitet, FysikumSilversteinS. B.autStockholms universitet, FysikumSjölinJ.autStockholms universitet, FysikumStrandbergS.autStockholms universitet, FysikumStrubigA.autStockholms universitet, FysikumValdes SanturioE.autStockholms universitet, FysikumZwalinskiL.autStockholms universitetNaturvetenskapliga fakultetenFysikumpblStudies of the Energy Dependence of Diboson Polarization Fractions and the Radiation-Amplitude-Zero Effect in WZ Production with the ATLAS Detectoreng20242025-01-13T14:42:00https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-23775510.1103/PhysRevLett.133.101802393032330013825166000012-s2.0-85204512055101802https://doi.org/10.1103/PhysRevLett.133.101802textNatural SciencesPhysical SciencesSubatomic PhysicsNaturvetenskapFysikSubatomär fysikThis Letter presents the first study of the energy dependence of diboson polarization fractions in WZ → ℓνℓ′ℓ′(ℓ,ℓ′ = e; μ) production. The dataset used corresponds to an integrated luminosity of 140 fb−1 of proton-proton collisions at a center-of-mass energy of 13 TeV recorded by the ATLAS detector. Two fiducial regions with an enhanced presence of events featuring two longitudinally polarized bosons are defined. A nonzero fraction of events with two longitudinally polarized bosons is measured with an observed significance of 5.3 standard deviations in the region with 100 < pZT ≤ 200 GeV and 1.6 standard deviations in the region with pZT > 200 GeV, where pZT is the transverse momentum of the Z boson. This Letter also reports the first study of the radiation-amplitude-zero effect. Events with two transversely polarized bosons are analyzed for the ΔY(ℓWZ) and ΔYℓWZ) distributions defined respectively as the rapidity difference between the lepton from the W boson decay and the Z boson and the rapidity difference between the W boson and the Z boson. Significant suppression of events near zero is observed in both distributions. Unfolded ΔY(ℓWZ) and ΔY(WZ) distributions are also measured and compared to theoretical predictions.Physical Review Letters0031-90071079-711413310Published2918lifa3973su2025-01-132025-10-03diva2:1926837refereedrefRefereedRefereegranskatFagfellevurdertarticleartArticle in journalArtikel i tidskriftArtikkel i tidsskriftarticleAadG.autAndreanS. Y.autStockholms universitet, FysikumBackmanF.autStockholms universitet, FysikumNavarroL. BarrancoautStockholms universitet, FysikumBohmC.autStockholms universitet, FysikumClementC.autStockholms universitet, FysikumDunneK.autStockholms universitet, FysikumHellmanS.autStockholms universitet, FysikumCarlsonT. IngebretsenautStockholms universitet, FysikumKimD. W.autStockholms universitet, FysikumLeeS.autStockholms universitet, FysikumLouX.autStockholms universitet, FysikumLouX.autStockholms universitet, FysikumMilsteadD. A.autStockholms universitet, FysikumPasuwanP.autStockholms universitet, FysikumSanchezL. PereiraautStockholms universitet, FysikumRichterS.autStockholms universitet, FysikumRiefelE. M.autStockholms universitet, FysikumSilversteinS. B.autStockholms universitet, FysikumSjolinJ.autStockholms universitet, FysikumStrandbergS.autStockholms universitet, FysikumStrubigA.autStockholms universitet, FysikumSanturioE. ValdesautStockholms universitet, FysikumZwalinskiL.autStockholms universitetNaturvetenskapliga fakultetenFysikumpblDetermination of the Relative Sign of the Higgs Boson Couplings to W and Z Bosons Using WH Production via Vector-Boson Fusion with the ATLAS Detectoreng20242025-10-10T12:25:44https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-24781910.1103/PhysRevLett.133.141801394233790013825790000012-s2.0-85206872892141801https://doi.org/10.1103/PhysRevLett.133.141801textNatural SciencesPhysical SciencesAstronomy, Astrophysics and CosmologyNaturvetenskapFysikAstronomi, astrofysik och kosmologiThe associated production of Higgs and W bosons via vector-boson fusion is highly sensitive to the relative sign of the Higgs boson couplings to W and Z bosons. In this Letter, two searches for this process are presented, using 140 fb(-1) of proton-proton collision data at root s = 13 TeV recorded by the ATLAS detector at the LHC. The first search targets scenarios with opposite-sign couplings of the W and Z bosons to the Higgs boson, while the second targets standard model-like scenarios with same-sign couplings. Both analyses consider Higgs boson decays into a pair of b quarks and W boson decays with an electron or muon. The data exclude the opposite-sign coupling hypothesis with a significance beyond 5 sigma, and the observed (expected) upper limit set on the cross section for vector-boson fusion WH production is 9.0 (8.7) times the standard model value at 95% confidence level.Physical Review Letters0031-90071079-711413314Published2935lifa3973su2025-10-102025-10-10diva2:2005665refereedrefRefereedRefereegranskatFagfellevurdertarticleartArticle in journalArtikel i tidskriftArtikkel i tidsskriftarticleAadG.autAndreanS. Y.autStockholms universitet, FysikumBackmanF.autStockholms universitet, FysikumNavarroL. BarrancoautStockholms universitet, FysikumBohmC.autStockholms universitet, FysikumClementC.autStockholms universitet, FysikumDunneK.autStockholms universitet, FysikumHellmanS.autStockholms universitet, FysikumCarlsonT. IngebretsenautStockholms universitet, FysikumKimD. W.autStockholms universitet, FysikumLeeS.autStockholms universitet, FysikumLouX.autStockholms universitet, FysikumMilsteadD. A.autStockholms universitet, FysikumPasuwanP.autStockholms universitet, FysikumSanchezL. PereiraautStockholms universitet, FysikumRichterS.autStockholms universitet, FysikumRiefelE. M.autStockholms universitet, FysikumSilversteinS. B.autStockholms universitet, FysikumSjölinJ.autStockholms universitet, FysikumStrandbergS.autStockholms universitet, FysikumStrubigA.autStockholms universitet, FysikumSanturioE. ValdesautStockholms universitet, FysikumZwalinskiL.autStockholms universitetNaturvetenskapliga fakultetenFysikumpblSearch for short- and long-lived axion-like particles in H→aa→4γ decays with the ATLAS experiment at the LHCeng20242025-01-27T11:52:00https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-23844810.1140/epjc/s10052-024-12979-00013946327000012-s2.0-85200026299742https://doi.org/10.1140/epjc/s10052-024-12979-0textNatural SciencesPhysical SciencesSubatomic PhysicsNaturvetenskapFysikSubatomär fysikPresented is the search for anomalous Higgs boson decays into two axion-like particles (ALPs) using the full Run 2 data set of 140fb-1 of proton-proton collisions at a centre-of-mass energy of 13TeV recorded by the ATLAS experiment. The ALPs are assumed to decay into two photons, providing sensitivity to recently proposed models that could explain the (g-2)μ discrepancy. This analysis covers an ALP mass range from 100 to 62GeV and ALP-photon couplings in the range 10-7TeV-1<Caγγ/Λ<1TeV-1, and therefore includes signatures with significantly displaced vertices and highly collinear photons. No significant excess of events above the Standard Model background is observed. Upper limits at 95% confidence level are placed on the branching ratio of the Higgs boson to two ALPs in the four-photon final state, and are in the range of 10-5 to 3×10-2, depending on the hypothesized ALP mass and ALP-photon coupling strength.European Physical Journal C1434-60441434-6052847Published2949lifa3973su2025-01-272025-10-02diva2:1931487refereedrefRefereedRefereegranskatFagfellevurdertarticleartArticle in journalArtikel i tidskriftArtikkel i tidsskriftarticleAadG.autAndreanS. Y.autStockholms universitet, FysikumBackmanFilip1991-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0001-7489-9184diva-portal.org=authority-person:83753Barranco NavarroLaura1990-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0002-3380-8167diva-portal.org=authority-person:83754BohmChristian1946-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0003-3807-7831diva-portal.org=authority-person:83755ClementC.autStockholms universitet, FysikumHellmanSten1956-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0002-5415-1600diva-portal.org=authority-person:83757KastanasA.autStockholms universitet, FysikumLouX.autStockholms universitet, FysikumMilsteadDavid A.1970-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0002-7788-4129diva-portal.org=authority-person:83759MoaT.autStockholms universitet, FysikumNelsonM. E.autStockholms universitet, FysikumPasuwanP.autStockholms universitet, FysikumPereira SanchezL.autStockholms universitet, FysikumShaikhN. W.autStockholms universitet, FysikumSilversteinSamuel B.1967-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0001-7734-7617diva-portal.org=authority-person:83766SjölinJ.autStockholms universitet, FysikumStrandbergSara1977-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0001-7253-7497diva-portal.org=authority-person:83768Valdes SanturioE.autStockholms universitet, FysikumWallangenV.autStockholms universitet, FysikumZwalinskiL.autStockholms universitetNaturvetenskapliga fakultetenFysikumpblStockholms universitetNaturvetenskapliga fakultetenOskar Klein-centrum för kosmopartikelfysik (OKC)pblExpected tracking performance of the ATLAS Inner Tracker at the High-Luminosity LHCeng20252025-04-16T14:25:00https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-24218110.1088/1748-0221/20/02/P020180014390272000012-s2.0-105001207995P02018https://doi.org/10.1088/1748-0221/20/02/P02018textcalibrationcluster findingfitting methodsGaseous imaging and tracking detectorsParticle tracking detectors (Solid-state detectors)Pattern recognitionVertexing algorithmsNatural SciencesPhysical SciencesAstronomy, Astrophysics and CosmologyNaturvetenskapFysikAstronomi, astrofysik och kosmologiThe high-luminosity phase of LHC operations (HL-LHC), will feature a large increase in simultaneous proton-proton interactions per bunch crossing up to 200, compared with a typical leveling target of 64 in Run 3. Such an increase will create a very challenging environment in which to perform charged particle trajectory reconstruction, a task crucial for the success of the ATLAS physics program, and will exceed the capabilities of the current ATLAS Inner Detector (ID). A new all-silicon Inner Tracker (ITk) will replace the current ID in time for the start of the HL-LHC. To ensure successful use of the ITk capabilities in Run 4 and beyond, the ATLAS tracking software has been successfully adapted to achieve state-of-the-art track reconstruction in challenging high-luminosity conditions with the ITk detector. This paper presents the expected tracking performance of the ATLAS ITk based on the latest available developments since the ITk technical design reports.Journal of Instrumentation202Published2959lifa3973su2025-04-162025-10-02diva2:1952835refereedrefRefereedRefereegranskatFagfellevurdertarticleartArticle in journalArtikel i tidskriftArtikkel i tidsskriftarticleAadG.autAndreanStefio Y.1991-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0002-9766-2670diva-portal.org=authority-person:83752BackmanF.autStockholms universitet, FysikumBohmChristian1946-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0003-3807-7831diva-portal.org=authority-person:83755ClementC.autStockholms universitet, FysikumDunneK.autStockholms universitet, FysikumHellmanSten1956-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0002-5415-1600diva-portal.org=authority-person:83757Ingebretsen CarlsonT.autStockholms universitet, FysikumKimD. W.autStockholms universitet, FysikumLeeS.autStockholms universitet, FysikumLouX.autStockholms universitet, FysikumMilsteadD. A.autStockholms universitet, FysikumMontellaA.autStockholms universitet, FysikumRichterS.autStockholms universitet, FysikumRiefelE. M.autStockholms universitet, FysikumSilversteinS. B.autStockholms universitet, FysikumSjölinJ.autStockholms universitet, FysikumStrandbergS.autStockholms universitet, FysikumStrubigA.autStockholms universitet, FysikumValdes SanturioE.autStockholms universitet, FysikumZwalinskiL.autStockholms universitetNaturvetenskapliga fakultetenFysikumpblStockholms universitetNaturvetenskapliga fakultetenOskar Klein-centrum för kosmopartikelfysik (OKC)pblConstraint on the total width of the Higgs boson from Higgs boson and four-top-quark measurements in pp collisions at s = 13 TeV with the ATLAS detectoreng20252025-02-27T12:15:00https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-23989710.1016/j.physletb.2025.1392770014136627000012-s2.0-85215925159139277https://doi.org/10.1016/j.physletb.2025.139277textNatural SciencesPhysical SciencesSubatomic PhysicsNaturvetenskapFysikSubatomär fysikThis Letter presents a constraint on the total width of the Higgs boson (ΓH) using a combined measurement of on-shell Higgs boson production and the production of four top quarks, which involves contributions from off-shell Higgs boson-mediated processes. This method relies on the assumption that the tree-level Higgs-top Yukawa coupling strength is the same for on-shell and off-shell Higgs boson production processes, thereby avoiding any assumptions about the relationship between on-shell and off-shell gluon fusion Higgs production rates, which were central to previous measurements. The result is based on up to 140 fb−1 of proton–proton collisions at a centre-of-mass energy of s = 13 TeV collected with the ATLAS detector at the Large Hadron Collider. The observed (expected) 95% confidence level upper limit on ΓH is 450 MeV (75 MeV). Additionally, considering the constraint on the Higgs-top Yukawa coupling from loop-induced Higgs boson production and decay processes further yields an observed (expected) upper limit of 160 MeV (55 MeV).Physics Letters B0370-26931873-2445861Published2939lifa3973su2025-02-272025-10-02diva2:1940998refereedrefRefereedRefereegranskatFagfellevurdertarticleartArticle in journalArtikel i tidskriftArtikkel i tidsskriftarticleAadG.autAndreanStefio Y.1991-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0002-9766-2670diva-portal.org=authority-person:83752BackmanFilip1991-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0001-7489-9184diva-portal.org=authority-person:83753Barranco NavarroLaura1990-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0002-3380-8167diva-portal.org=authority-person:83754BohmC.autStockholms universitet, FysikumClementC.autStockholms universitet, FysikumDunneK.autStockholms universitet, FysikumHellmanSten1956-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0002-5415-1600diva-portal.org=authority-person:83757Ingebretsen CarlsonT.autStockholms universitet, FysikumKimD. W.autStockholms universitet, FysikumLeeS.autStockholms universitet, FysikumLouX.autStockholms universitet, FysikumMilsteadD. A.autStockholms universitet, FysikumPasuwanP.autStockholms universitet, FysikumPereira SanchezL.autStockholms universitet, FysikumRichterS.autStockholms universitet, FysikumSilversteinS. B.autStockholms universitet, FysikumSjölinJ.autStockholms universitet, FysikumStrandbergS.autStockholms universitet, FysikumStrubigA.autStockholms universitet, FysikumValdes SanturioE.autStockholms universitet, FysikumZwalinskiL.autStockholms universitetNaturvetenskapliga fakultetenFysikumpblStockholms universitetNaturvetenskapliga fakultetenOskar Klein-centrum för kosmopartikelfysik (OKC)pblSearch for pair production of third-generation leptoquarks decaying into a bottom quark and a τ -lepton with the ATLAS detectoreng20232024-12-13T12:48:43https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-23665410.1140/epjc/s10052-023-12104-72-s2.0-851807459811075textNatural SciencesPhysical SciencesAstronomy, Astrophysics and CosmologyNaturvetenskapFysikAstronomi, astrofysik och kosmologiA search for pair-produced scalar or vector leptoquarks decaying into a b-quark and a τ -lepton is presented using the full LHC Run 2 (2015–2018) data sample of 139 fb - 1 collected with the ATLAS detector in proton–proton collisions at a centre-of-mass energy of s=13 TeV. Events in which at least one τ -lepton decays hadronically are considered, and multivariate discriminants are used to extract the signals. No significant deviations from the Standard Model expectation are observed and 95% confidence-level upper limits on the production cross-section are derived as a function of leptoquark mass and branching ratio B into a τ -lepton and b-quark. For scalar leptoquarks, masses below 1460 GeV are excluded assuming B= 100 %, while for vector leptoquarks the corresponding limit is 1650 GeV (1910 GeV) in the minimal-coupling (Yang–Mills) scenario.European Physical Journal C1434-60441434-60528311Published2879lifa3973su2024-12-132024-12-13diva2:1921148refereedrefRefereedRefereegranskatFagfellevurdertarticleartArticle in journalArtikel i tidskriftArtikkel i tidsskriftarticleAadG.autAndreanStefio Y.1991-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0002-9766-2670diva-portal.org=authority-person:83752BackmanFilip1991-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0001-7489-9184diva-portal.org=authority-person:83753Barranco NavarroLaura1990-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0002-3380-8167diva-portal.org=authority-person:83754BohmChristian1946-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0003-3807-7831diva-portal.org=authority-person:83755ClementC.autStockholms universitet, FysikumDunneK.autStockholms universitet, FysikumHellmanSten1956-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0002-5415-1600diva-portal.org=authority-person:83757Ingebretsen CarlsonT.autStockholms universitet, FysikumKimD. W.autStockholms universitet, FysikumLeeS.autStockholms universitet, FysikumLouX.autStockholms universitet, FysikumMilsteadD. A.autStockholms universitet, FysikumPasuwanP.autStockholms universitet, FysikumPereira SanchezL.autStockholms universitet, FysikumRichterS.autStockholms universitet, FysikumRiefelE. M.autStockholms universitet, FysikumSilversteinS. B.autStockholms universitet, FysikumSjölinJ.autStockholms universitet, FysikumStrandbergS.autStockholms universitet, FysikumStrubigA.autStockholms universitet, FysikumValdes SanturioE.autStockholms universitet, FysikumZwalinskiL.autStockholms universitetNaturvetenskapliga fakultetenFysikumpblStockholms universitetNaturvetenskapliga fakultetenOskar Klein-centrum för kosmopartikelfysik (OKC)pblATLAS Run 2 searches for electroweak production of supersymmetric particles interpreted within the pMSSMeng20242025-03-27T12:31:37https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-24129910.1007/JHEP05(2024)1060012800635000012-s2.0-85208419299106https://doi.org/10.1007/JHEP05(2024)106textBeyond Standard ModelHadron-Hadron ScatteringSupersymmetryNatural SciencesPhysical SciencesAstronomy, Astrophysics and CosmologyNaturvetenskapFysikAstronomi, astrofysik och kosmologiA summary of the constraints from searches performed by the ATLAS collaboration for the electroweak production of charginos and neutralinos is presented. Results from eight separate ATLAS searches are considered, each using 140 fb−1 of proton-proton data at a centre-of-mass energy of s = 13 TeV collected at the Large Hadron Collider during its second data-taking run. The results are interpreted in the context of the 19-parameter phenomenological minimal supersymmetric standard model, where R-parity conservation is assumed and the lightest supersymmetric particle is assumed to be the lightest neutralino. Constraints from previous electroweak, flavour and dark matter related measurements are also considered. The results are presented in terms of constraints on supersymmetric particle masses and are compared with limits from simplified models. Also shown is the impact of ATLAS searches on parameters such as the dark matter relic density and the spin-dependent and spin-independent scattering cross-sections targeted by direct dark matter detection experiments. The Higgs boson and Z boson ‘funnel regions’, where a low-mass neutralino would not oversaturate the dark matter relic abundance, are almost completely excluded by the considered constraints. Example spectra for non-excluded supersymmetric models with light charginos and neutralinos are also presented.Journal of High Energy Physics (JHEP)1126-67081029-847920245Published2903lifa3973su2025-03-272025-03-27diva2:1947939refereedrefRefereedRefereegranskatFagfellevurdertarticleartArticle in journalArtikel i tidskriftArtikkel i tidsskriftarticleAadG.autAndreanStefio Y.1991-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0002-9766-2670diva-portal.org=authority-person:83752BackmanFilip1991-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0001-7489-9184diva-portal.org=authority-person:83753Barranco NavarroLaura1990-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0002-3380-8167diva-portal.org=authority-person:83754BohmChristian1946-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0003-3807-7831diva-portal.org=authority-person:83755ClementC.autStockholms universitet, FysikumDunneK.autStockholms universitet, FysikumHellmanSten1956-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0002-5415-1600diva-portal.org=authority-person:83757Ingebretsen CarlsonT.autStockholms universitet, FysikumKimD. W.autStockholms universitet, FysikumLeeS.autStockholms universitet, FysikumLouX.autStockholms universitet, FysikumMilsteadD. A.autStockholms universitet, FysikumPasuwanP.autStockholms universitet, FysikumPereira SanchezL.autStockholms universitet, FysikumRichterS.autStockholms universitet, FysikumSilversteinS. B.autStockholms universitet, FysikumSjölinJ.autStockholms universitet, FysikumStrandbergS.autStockholms universitet, FysikumStrubigA.autStockholms universitet, FysikumValdes SanturioE.autStockholms universitet, FysikumZwalinskiL.autStockholms universitetNaturvetenskapliga fakultetenFysikumpblStockholms universitetNaturvetenskapliga fakultetenOskar Klein-centrum för kosmopartikelfysik (OKC)pblTest of CP-invariance of the Higgs boson in vector-boson fusion production and in its decay into four leptonseng20242025-03-27T12:45:35https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-24129810.1007/JHEP05(2024)1050012800966000012-s2.0-85208419593105https://doi.org/10.1007/JHEP05(2024)105textHadron-Hadron ScatteringHiggs PhysicsNatural SciencesPhysical SciencesAstronomy, Astrophysics and CosmologyNaturvetenskapFysikAstronomi, astrofysik och kosmologiA search for CP violation in the decay kinematics and vector-boson fusion production of the Higgs boson is performed in the H → ZZ* → 4ℓ (ℓ = e, μ) decay channel. The results are based on proton-proton collision data produced at the LHC at a centre-of-mass energy of 13 TeV and recorded by the ATLAS detector from 2015 to 2018, corresponding to an integrated luminosity of 139 fb−1. Matrix element-based optimal observables are used to constrain CP-odd couplings beyond the Standard Model in the framework of Standard Model effective field theory expressed in the Warsaw and Higgs bases. Differential fiducial cross-section measurements of the optimal observables are also performed, and a new fiducial cross-section measurement for vector-boson-fusion production is provided. All measurements are in agreement with the Standard Model prediction of a CP-even Higgs boson.Journal of High Energy Physics (JHEP)1126-67081029-847920245Published2882lifa3973su2025-03-272025-03-27diva2:1947945refereedrefRefereedRefereegranskatFagfellevurdertarticleartArticle in journalArtikel i tidskriftArtikkel i tidsskriftarticleAadG.autAndreanStefio Y.1991-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0002-9766-2670diva-portal.org=authority-person:83752BackmanFilip1991-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0001-7489-9184diva-portal.org=authority-person:83753Barranco NavarroLaura1990-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0002-3380-8167diva-portal.org=authority-person:83754BohmChristian1946-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0003-3807-7831diva-portal.org=authority-person:83755ClementC.autStockholms universitet, FysikumDunneKatherine1987-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0003-2626-2247diva-portal.org=authority-person:86268HellmanSten1956-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0002-5415-1600diva-portal.org=authority-person:83757Ingebretsen CarlsonTom1989-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0002-3699-8517diva-portal.org=authority-person:85205KimDongwon1989-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0002-9635-1491diva-portal.org=authority-person:107874LeeS.autStockholms universitet, FysikumLouXuanhong1995-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0002-8309-5548diva-portal.org=authority-person:85133MilsteadDavid A.1970-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0002-7788-4129diva-portal.org=authority-person:83759PasuwanPatrawan1990-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0003-2987-2964diva-portal.org=authority-person:83763Pereira SanchezLaura1995-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0001-7913-3313diva-portal.org=authority-person:83764RichterS.autStockholms universitet, FysikumRiefelE. M.autStockholms universitet, FysikumSilversteinS. B.autStockholms universitet, FysikumSjölinJ.autDepartment of Physics, Stockholm UniversityStrandbergS.autStockholms universitet, FysikumStrubigA.autStockholms universitet, FysikumValdes SanturioE.autStockholms universitet, FysikumZwalinskiL.autStockholms universitetNaturvetenskapliga fakultetenFysikumpblStockholms universitetNaturvetenskapliga fakultetenOskar Klein-centrum för kosmopartikelfysik (OKC)pblMeasurement of the Higgs boson mass with H → γγ decays in 140 fb−1 of s=13 TeV pp collisions with the ATLAS detectoreng20232024-12-13T12:54:20https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-23662910.1016/j.physletb.2023.1383150012571259000012-s2.0-85183774864138315https://doi.org/10.1016/j.physletb.2023.138315textNatural SciencesPhysical SciencesAstronomy, Astrophysics and CosmologyNaturvetenskapFysikAstronomi, astrofysik och kosmologiThe mass of the Higgs boson is measured in the H→γγ decay channel, exploiting the high resolution of the invariant mass of photon pairs reconstructed from the decays of Higgs bosons produced in proton–proton collisions at a centre-of-mass energy s=13 TeV. The dataset was collected between 2015 and 2018 by the ATLAS detector at the Large Hadron Collider, and corresponds to an integrated luminosity of 140 fb−1. The measured value of the Higgs boson mass is 125.17±0.11(stat.)±0.09(syst.) GeV and is based on an improved energy scale calibration for photons, whose impact on the measurement is about four times smaller than in the previous publication. A combination with the corresponding measurement using 7 and 8 TeV pp collision ATLAS data results in a Higgs boson mass measurement of 125.22±0.11(stat.)±0.09(syst.) GeV. With an uncertainty of 1.1 per mille, this is currently the most precise measurement of the mass of the Higgs boson from a single decay channel.Physics Letters B0370-26931873-2445847Published2908lifa3973su2024-12-132024-12-13diva2:1921152refereedrefRefereedRefereegranskatFagfellevurdertarticleartArticle in journalArtikel i tidskriftArtikkel i tidsskriftarticleAadG.autAndreanStefio Y.1991-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0002-9766-2670diva-portal.org=authority-person:83752BackmanFilip1991-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0001-7489-9184diva-portal.org=authority-person:83753Barranco NavarroLaura1990-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0002-3380-8167diva-portal.org=authority-person:83754BohmChristian1946-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0003-3807-7831diva-portal.org=authority-person:83755ClementC.autStockholms universitet, FysikumDunneKatherine1987-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0003-2626-2247diva-portal.org=authority-person:86268HellmanSten1956-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0002-5415-1600diva-portal.org=authority-person:83757Ingebretsen CarlsonTom1989-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0002-3699-8517diva-portal.org=authority-person:85205KimDongwon1989-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0002-9635-1491diva-portal.org=authority-person:107874LeeSuhyunautStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0003-0836-416Xdiva-portal.org=authority-person:94858LouXuanhong1995-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0002-8309-5548diva-portal.org=authority-person:85133MilsteadDavid A.1970-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0002-7788-4129diva-portal.org=authority-person:83759PasuwanPatrawan1990-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0003-2987-2964diva-portal.org=authority-person:83763Pereira SanchezLaura1995-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0001-7913-3313diva-portal.org=authority-person:83764RichterStefan1988-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0001-6613-4448diva-portal.org=authority-person:102681SilversteinSamuel B.1967-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0001-7734-7617diva-portal.org=authority-person:83766SjölinJörgen1968-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0002-5285-8995diva-portal.org=authority-person:83767StrandbergSara1977-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0001-7253-7497diva-portal.org=authority-person:83768StrubigS.autStockholms universitet, FysikumValdes SanturioautStockholms universitet, FysikumZwalinskiL.autStockholms universitetNaturvetenskapliga fakultetenFysikumpblStockholms universitetNaturvetenskapliga fakultetenOskar Klein-centrum för kosmopartikelfysik (OKC)pblA precise measurement of the Z-boson double-differential transverse momentum and rapidity distributions in the full phase space of the decay leptons with the ATLAS experiment at s=8 TeVeng20242024-11-26T13:36:21https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-23597810.1140/epjc/s10052-024-12438-w0012530176000032-s2.0-85190755857315https://doi.org/10.1140/epjc/s10052-024-12438-wtextNatural SciencesPhysical SciencesSubatomic PhysicsNaturvetenskapFysikSubatomär fysikThis paper presents for the first time a precise measurement of the production properties of the Z boson in the full phase space of the decay leptons. This is in contrast to the many previous precise unfolded measurements performed in the fiducial phase space of the decay leptons. The measurement is obtained from proton–proton collision data collected by the ATLAS experiment in 2012 at s=8 TeV at the LHC and corresponding to an integrated luminosity of 20.2 fb-1. The results, based on a total of 15.3 million Z-boson decays to electron and muon pairs, extend and improve a previous measurement of the full set of angular coefficients describing Z-boson decay. The double-differential cross-section distributions in Z-boson transverse momentum pT and rapidity y are measured in the pole region, defined as 80<mℓℓ<100 GeV, over the range |y|<3.6. The total uncertainty of the normalised cross-section measurements in the peak region of the pT distribution is dominated by statistical uncertainties over the full range and increases as a function of rapidity from 0.5–1.0% for |y|<2.0 to 2-7% at higher rapidities. The results for the rapidity-dependent transverse momentum distributions are compared to state-of-the-art QCD predictions, which combine in the best cases approximate N4LL resummation with N3LO fixed-order perturbative calculations. The differential rapidity distributions integrated over pT are even more precise, with accuracies from 0.2–0.3% for |y|<2.0 to 0.4–0.9% at higher rapidities, and are compared to fixed-order QCD predictions using the most recent parton distribution functions. The agreement between data and predictions is quite good in most cases.European Physical Journal C1434-60441434-6052843Published2930lifa3973su2024-11-262024-11-26diva2:1916087refereedrefRefereedRefereegranskatFagfellevurdertarticleartArticle in journalArtikel i tidskriftArtikkel i tidsskriftarticleAadG.autAndreanStefio Y.1991-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0002-9766-2670diva-portal.org=authority-person:83752BackmanFilip1991-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0001-7489-9184diva-portal.org=authority-person:83753Barranco NavarroLaura1990-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0002-3380-8167diva-portal.org=authority-person:83754BohmChristian1946-autStockholms universitet, Fysikumorcid.org=0000-0003-3807-7831diva-portal.org=authority-person:83755ClementChristophe1972-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0003-3122-3605diva-portal.org=authority-person:83756DunneKatherine1987-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0003-2626-2247diva-portal.org=authority-person:86268HellmanSten1956-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0002-5415-1600diva-portal.org=authority-person:83757Ingebretsen CarlsonTom1989-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0002-3699-8517diva-portal.org=authority-person:85205LeeSuhyunautStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)diva-portal.org=authority-person:94858LouXuanhong1995-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0002-8309-5548diva-portal.org=authority-person:85133MilsteadDavid A.1970-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0002-7788-4129diva-portal.org=authority-person:83759MoaTorbjörn1953-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0002-7644-5984diva-portal.org=authority-person:83761PasuwanPatrawan1990-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0003-2987-2964diva-portal.org=authority-person:83763Pereira SanchezLaura1995-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0001-7913-3313diva-portal.org=authority-person:83764RichterStefan1988-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0001-6613-4448diva-portal.org=authority-person:102681ShaikhNabila W.1989-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0001-9358-3505diva-portal.org=authority-person:83765SilversteinSamuel B.1967-autStockholms universitet, Fysikumorcid.org=0000-0001-7734-7617diva-portal.org=authority-person:83766SjölinJörgen1968-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0002-5285-8995diva-portal.org=authority-person:83767StrandbergSara1977-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0001-7253-7497diva-portal.org=authority-person:83768StrübigAntonia1985-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0002-2382-6951diva-portal.org=authority-person:85134Valdés SanturioEduardo1984-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0001-9931-2896diva-portal.org=authority-person:83769ZwalinskiL.autStockholms universitetNaturvetenskapliga fakultetenFysikumpblStockholms universitetNaturvetenskapliga fakultetenOskar Klein-centrum för kosmopartikelfysik (OKC)pblSearch for flavour-changing neutral-current couplings between the top quark and the photon with the ATLAS detector at √s=13 TeVeng20232023-09-26T15:44:24https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-22163310.1016/j.physletb.2022.1373790010237603000012-s2.0-85146929561137379https://doi.org/10.1016/j.physletb.2022.137379textNatural SciencesPhysical SciencesSubatomic PhysicsNaturvetenskapFysikSubatomär fysikThis letter documents a search for flavour-changing neutral currents (FCNCs), which are strongly suppressed in the Standard Model, in events with a photon and a top quark with the ATLAS detector. The analysis uses data collected in pp collisions at √s = 13 TeV during Run 2 of the LHC, corresponding to an integrated luminosity of 139 fb−1. Both FCNC top-quark production and decay are considered. The final state consists of a charged lepton, missing transverse momentum, a b-tagged jet, one high-momentum photon and possibly additional jets. A multiclass deep neural network is used to classify events either as signal in one of the two categories, FCNC production or decay, or as background. No significant excess of events over the background prediction is observed and 95% CL upper limits are placed on the strength of left- and right-handed FCNC interactions. The 95% CL bounds on the branching fractions for the FCNC top-quark decays, estimated (expected) from both top-quark production and decay, are B(t → uγ ) < 0.85 (0.88<img src="http://www.diva-portal.org/cgi-bin/mimetex.cgi?$_%7B+0.37%7D%5E%7B-0.25%7D$" data-classname="equation" />) × 10−5 and B(t → cγ ) < 4.2 (3.40<img src="http://www.diva-portal.org/cgi-bin/mimetex.cgi?$_%7B+1.35%7D%5E%7B-0.95%7D$" data-classname="equation" />) × 10−5 for a left-handed tqγ coupling, and B(t → uγ ) < 1.2 (1.20<img src="http://www.diva-portal.org/cgi-bin/mimetex.cgi?$_%7B+0.50%7D%5E%7B-0.33%7D$" data-classname="equation" />)×10−5 and B(t → cγ ) < 4.5 (3.70<img src="http://www.diva-portal.org/cgi-bin/mimetex.cgi?$_%7B+1.47%7D%5E%7B-1.03%7D$" data-classname="equation" />)×10−5 for a right-handed coupling.Physics Letters B0370-26931873-2445842Published2876albo5064su2023-09-262023-09-26diva2:1800408refereedrefRefereedRefereegranskatFagfellevurdertarticleartArticle in journalArtikel i tidskriftArtikkel i tidsskriftarticleAadG.autAndreanStefio Y.1991-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0002-9766-2670diva-portal.org=authority-person:83752BackmanFilip1991-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0001-7489-9184diva-portal.org=authority-person:83753Barranco NavarroLaura1990-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0002-3380-8167diva-portal.org=authority-person:83754BohmChristian1946-autStockholms universitet, Fysikumorcid.org=0000-0003-3807-7831diva-portal.org=authority-person:83755ClementChristophe1972-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0003-3122-3605diva-portal.org=authority-person:83756DunneKatherine1987-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0003-2626-2247diva-portal.org=authority-person:86268HellmanSten1956-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0002-5415-1600diva-portal.org=authority-person:83757Ingebretsen CarlsonTom1989-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0002-3699-8517diva-portal.org=authority-person:85205LouXuanhong1995-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0002-8309-5548diva-portal.org=authority-person:85133MilsteadDavid A.1970-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)diva-portal.org=authority-person:83759MoaTorbjörn1953-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0002-7644-5984diva-portal.org=authority-person:83761PasuwanPatrawan1990-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0003-2987-2964diva-portal.org=authority-person:83763Pereira SanchezLaura1995-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0001-7913-3313diva-portal.org=authority-person:83764ShaikhNabila W.1989-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0001-9358-3505diva-portal.org=authority-person:83765SilversteinSamuel B.1967-autStockholms universitet, Fysikumorcid.org=0000-0001-7734-7617diva-portal.org=authority-person:83766SjölinJörgen1968-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0002-5285-8995diva-portal.org=authority-person:83767StrandbergSara1977-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0001-7253-7497diva-portal.org=authority-person:83768StrübigAntonia1985-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0002-2382-6951diva-portal.org=authority-person:85134Valdés SanturioEduardo1984-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0001-9931-2896diva-portal.org=authority-person:83769ZwalinskiL.autStockholms universitetNaturvetenskapliga fakultetenFysikumpblStockholms universitetNaturvetenskapliga fakultetenOskar Klein-centrum för kosmopartikelfysik (OKC)pblSearch for heavy, long-lived, charged particles with large ionisation energy loss in pp collisions at √s = 13 TeV using the ATLAS experiment and the full Run 2 dataseteng20232023-09-26T14:25:28https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-22163210.1007/JHEP06(2023)1580010354349000012-s2.0-85163824606158https://doi.org/10.1007/JHEP06(2023)158textBeyond Standard ModelExoticsHadron-Hadron ScatteringSupersymmetryNatural SciencesPhysical SciencesSubatomic PhysicsNaturvetenskapFysikSubatomär fysikThis paper presents a search for hypothetical massive, charged, long-lived particles with the ATLAS detector at the LHC using an integrated luminosity of 139 fb−1 of proton–proton collisions at √s = 13 TeV. These particles are expected to move significantly slower than the speed of light and should be identifiable by their high transverse momenta and anomalously large specific ionisation losses, dE/dx. Trajectories reconstructed solely by the inner tracking system and a dE/dx measurement in the pixel detector layers provide sensitivity to particles with lifetimes down to O(1) ns with a mass, measured using the Bethe–Bloch relation, ranging from 100 GeV to 3 TeV. Interpretations for pair-production of R-hadrons, charginos and staus in scenarios of supersymmetry compatible with these particles being long-lived are presented, with mass limits extending considerably beyond those from previous searches in broad ranges of lifetime.Journal of High Energy Physics (JHEP)1126-67081029-847920236Published2855albo5064su2023-09-262023-09-26diva2:1800369refereedrefRefereedRefereegranskatFagfellevurdertarticleartArticle in journalArtikel i tidskriftArtikkel i tidsskriftarticleAadG.autAndreanStefio Y.1991-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0002-9766-2670diva-portal.org=authority-person:83752BackmanFilip1991-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0001-7489-9184diva-portal.org=authority-person:83753Barranco NavarroLaura1990-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0002-3380-8167diva-portal.org=authority-person:83754BohmChristian1946-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0003-3807-7831diva-portal.org=authority-person:83755ClémentChristophe1972-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0003-3122-3605diva-portal.org=authority-person:83756DunneKatherine1987-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0003-2626-2247diva-portal.org=authority-person:86268HellmanSten1956-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0002-5415-1600diva-portal.org=authority-person:83757Ingebretsen CarlsonTom1989-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0002-3699-8517diva-portal.org=authority-person:85205KimDongwon1989-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0002-9635-1491diva-portal.org=authority-person:107874LeeSuhyunautStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0003-0836-416Xdiva-portal.org=authority-person:94858LouXinchouautStockholms universitet, Fysikumorcid.org=0000-0003-0867-2189MilsteadDavid A.1970-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0002-7788-4129diva-portal.org=authority-person:83759PasuwanPatrawan1990-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0003-2987-2964diva-portal.org=authority-person:83763Pereira SanchezLaura1995-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0001-7913-3313diva-portal.org=authority-person:83764RichterStefan1988-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0001-6613-4448diva-portal.org=authority-person:102681SilversteinSamuel B.1967-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0001-7734-7617diva-portal.org=authority-person:83766SjölinJörgen1968-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0002-5285-8995diva-portal.org=authority-person:83767StrandbergSara1977-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0001-7253-7497diva-portal.org=authority-person:83768StrübigAntonia1985-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0002-2382-6951diva-portal.org=authority-person:85134Valdés SanturioEduardo1984-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0001-9931-2896diva-portal.org=authority-person:83769ZwalinskiL.autStockholms universitetNaturvetenskapliga fakultetenFysikumpblStockholms universitetNaturvetenskapliga fakultetenOskar Klein-centrum för kosmopartikelfysik (OKC)pblCombination and summary of ATLAS dark matter searches interpreted in a 2HDM with a pseudo-scalar mediator using 139 fb−1 of √s = 13 TeV pp collision dataeng20242025-01-16T15:20:00https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-23719510.1016/j.scib.2024.06.0030013679446000012-s2.0-85202659550https://doi.org/10.1016/j.scib.2024.06.003textBeyond Standard ModelDark matterHigh-energy physicsProton-protonNatural SciencesPhysical SciencesSubatomic PhysicsNaturvetenskapFysikSubatomär fysikResults from a wide range of searches targeting different experimental signatures with and without missing transverse momentum (ETmiss) are used to constrain a Two-Higgs-Doublet Model (2HDM) with an additional pseudo-scalar mediating the interaction between ordinary and dark matter (2HDM+a). The analyses use up to 139 fb−1 of proton–proton collision data at a centre-of-mass energy s=13 TeV recorded with the ATLAS detector at the Large Hadron Collider during 2015–2018. The results from three of the most sensitive searches are combined statistically. These searches target signatures with large ETmiss and a leptonically decaying Z boson; large ETmiss and a Higgs boson decaying to bottom quarks; and production of charged Higgs bosons in final states with top and bottom quarks, respectively. Constraints are derived for several common and new benchmark scenarios in the 2HDM+a.Science Bulletin2095-9273691930053035Published2883barlodsu2025-01-162025-10-02diva2:1928335refereedrefRefereedRefereegranskatFagfellevurdertarticleartArticle in journalArtikel i tidskriftArtikkel i tidsskriftarticleAadG.autAndreanStefio Y.1991-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0002-9766-2670diva-portal.org=authority-person:83752BackmanFilip1991-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0001-7489-9184diva-portal.org=authority-person:83753Barranco NavarroLaura1990-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0002-3380-8167diva-portal.org=authority-person:83754BohmChristian1946-autStockholms universitet, Fysikumorcid.org=0000-0003-3807-7831diva-portal.org=authority-person:83755ClémentChristophe1972-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0003-3122-3605diva-portal.org=authority-person:83756DunneKatherine1987-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0003-2626-2247diva-portal.org=authority-person:86268HellmanSten1956-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0002-5415-1600diva-portal.org=authority-person:83757Ingebretsen CarlsonTom1989-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0002-3699-8517diva-portal.org=authority-person:85205KimDongwon1989-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0002-9635-1491diva-portal.org=authority-person:107874LeeSuhyunautStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0003-0836-416Xdiva-portal.org=authority-person:94858LouXuanhong1995-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0002-8309-5548diva-portal.org=authority-person:85133MilsteadDavid A.1970-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0002-7788-4129diva-portal.org=authority-person:83759MoaTorbjörn1953-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0002-7644-5984diva-portal.org=authority-person:83761PasuwanPatrawan1990-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0003-2987-2964diva-portal.org=authority-person:83763Pereira SanchezLaura1995-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0001-7913-3313diva-portal.org=authority-person:83764RichterStefan1988-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0001-6613-4448diva-portal.org=authority-person:102681ShaikhNabila W.1989-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0001-9358-3505diva-portal.org=authority-person:83765SilversteinSamuel B.1967-autStockholms universitet, Fysikumorcid.org=0000-0001-7734-7617diva-portal.org=authority-person:83766SjölinJörgen1968-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0002-5285-8995diva-portal.org=authority-person:83767StrandbergSara1977-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0001-7253-7497diva-portal.org=authority-person:83768StrübigAntonia1985-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0002-2382-6951diva-portal.org=authority-person:85134Valdés SanturioEduardo1984-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0001-9931-2896diva-portal.org=authority-person:83769ZwalinskiL.autStockholms universitetNaturvetenskapliga fakultetenFysikumpblStockholms universitetNaturvetenskapliga fakultetenOskar Klein-centrum för kosmopartikelfysik (OKC)pblA search for heavy Higgs bosons decaying into vector bosons in same-sign two-lepton final states in pp collisions at √s=13 TeV with the ATLAS detectoreng20232023-10-26T08:00:00https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-22327110.1007/JHEP07(2023)2000010618522000012-s2.0-85175870925200https://doi.org/10.1007/JHEP07(2023)200textHiggs PhysicsHadron-Hadron ScatteringProton-Proton ScatteringNatural SciencesPhysical SciencesSubatomic PhysicsNaturvetenskapFysikSubatomär fysikA search for heavy Higgs bosons produced in association with a vector boson and decaying into a pair of vector bosons is performed in final states with two leptons (electrons or muons) of the same electric charge, missing transverse momentum and jets. A data sample of proton–proton collisions at a centre-of-mass energy of 13 TeV recorded with the ATLAS detector at the Large Hadron Collider between 2015 and 2018 is used. The data correspond to a total integrated luminosity of 139 fb−1. The observed data are in agreement with Standard Model background expectations. The results are interpreted using higher-dimensional operators in an effective field theory. Upper limits on the production cross-section are calculated at 95% confidence level as a function of the heavy Higgs boson’s mass and coupling strengths to vector bosons. Limits are set in the Higgs boson mass range from 300 to 1500 GeV, and depend on the assumed couplings. The highest excluded mass for a heavy Higgs boson with the coupling combinations explored is 900 GeV. Limits on coupling strengths are also provided.Journal of High Energy Physics (JHEP)1126-67081029-847920237Published2915albo5064su2023-10-262024-10-16diva2:1807357refereedrefRefereedRefereegranskatFagfellevurdertarticleartArticle in journalArtikel i tidskriftArtikkel i tidsskriftarticleAadG.autAndreanStefio Y.1991-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0002-9766-2670diva-portal.org=authority-person:83752BackmanFilip1991-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0001-7489-9184diva-portal.org=authority-person:83753Barranco NavarroLaura1990-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0002-3380-8167diva-portal.org=authority-person:83754BohmChristian1946-autStockholms universitet, Fysikumorcid.org=0000-0003-3807-7831diva-portal.org=authority-person:83755ClémentChristophe1972-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0003-3122-3605diva-portal.org=authority-person:83756DunneKatherine1987-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0003-2626-2247diva-portal.org=authority-person:86268HellmanSten1956-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0002-5415-1600diva-portal.org=authority-person:83757Ingebretsen CarlsonTom1989-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0002-3699-8517diva-portal.org=authority-person:85205KimDongwon1989-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0002-9635-1491diva-portal.org=authority-person:107874LeeSuhyunautStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0003-0836-416Xdiva-portal.org=authority-person:94858LouXuanhong1995-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0002-8309-5548diva-portal.org=authority-person:85133MilsteadDavid A.1970-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0002-7788-4129diva-portal.org=authority-person:83759MoaTorbjörn1953-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0002-7644-5984diva-portal.org=authority-person:83761PasuwanPatrawan1990-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0003-2987-2964diva-portal.org=authority-person:83763Pereira SanchezLaura1995-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0001-7913-3313diva-portal.org=authority-person:83764RichterStefan1988-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0001-6613-4448diva-portal.org=authority-person:102681ShaikhNabila W.1989-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0001-9358-3505diva-portal.org=authority-person:83765SilversteinSamuel B.1967-autStockholms universitet, Fysikumorcid.org=0000-0001-7734-7617diva-portal.org=authority-person:83766SjölinJörgen1968-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0002-5285-8995diva-portal.org=authority-person:83767StrandbergSara1977-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0001-7253-7497diva-portal.org=authority-person:83768StrübigAntonia1985-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0002-2382-6951diva-portal.org=authority-person:85134Valdés SanturioEduardo1984-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0001-9931-2896diva-portal.org=authority-person:83769ZwalinskiL.autStockholms universitetNaturvetenskapliga fakultetenFysikumpblStockholms universitetNaturvetenskapliga fakultetenOskar Klein-centrum för kosmopartikelfysik (OKC)pblConstraints on spin-0 dark matter mediators and invisible Higgs decays using ATLAS 13 TeV pp collision data with two top quarks and missing transverse momentum in the final stateeng20232024-04-15T15:04:06https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-22821510.1140/epjc/s10052-023-11477-z0011874593000042-s2.0-85164130040503https://doi.org/10.1140/epjc/s10052-023-11477-ztextNatural SciencesPhysical SciencesSubatomic PhysicsNaturvetenskapFysikSubatomär fysikThis paper presents a statistical combination of searches targeting final states with two top quarks and invisible particles, characterised by the presence of zero, one or two leptons, at least one jet originating from a b-quark and missing transverse momentum. The analyses are searches for phenomena beyond the Standard Model consistent with the direct production of dark matter in pp collisions at the LHC, using 139 fb−1 of data collected with the ATLAS detector at a centre-of-mass energy of 13 TeV. The results are interpreted in terms of simplified dark matter models with a spin-0 scalar or pseudoscalar mediator particle. In addition, the results are interpreted in terms of upper limits on the Higgs boson invisible branching ratio, where the Higgs boson is produced according to the Standard Model in association with a pair of top quarks. For scalar (pseudoscalar) dark matter models, with all couplings set to unity, the statistical combination extends the mass range excluded by the best of the individual channels by 50 (25) GeV, excluding mediator masses up to 370 GeV. In addition, the statistical combination improves the expected coupling exclusion reach by 14% (24%), assuming a scalar (pseudoscalar) mediator mass of 10 GeV. An upper limit on the Higgs boson invisible branching ratio of 0.38 (<img src="http://www.diva-portal.org/cgi-bin/mimetex.cgi?0.30_%7B-0.09%7D%5E%7B+0.13%7D" data-classname="equation" />) is observed (expected) at 95% confidence level.European Physical Journal C1434-60441434-6052836Published2894albo5064su2024-04-152024-04-15diva2:1851680refereedrefRefereedRefereegranskatFagfellevurdertarticleartArticle in journalArtikel i tidskriftArtikkel i tidsskriftarticleAadG.autAndreanStefio Y.1991-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0002-9766-2670diva-portal.org=authority-person:83752BackmanFilip1991-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0001-7489-9184diva-portal.org=authority-person:83753Barranco NavarroLaura1990-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0002-3380-8167diva-portal.org=authority-person:83754BohmChristian1946-autStockholms universitet, Fysikumorcid.org=0000-0003-3807-7831diva-portal.org=authority-person:83755ClémentChristophe1972-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0003-3122-3605diva-portal.org=authority-person:83756DunneKatherine1987-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0003-2626-2247diva-portal.org=authority-person:86268HellmanSten1956-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0002-5415-1600diva-portal.org=authority-person:83757Ingebretsen CarlsonTom1989-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0002-3699-8517diva-portal.org=authority-person:85205KimDongwon1989-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0002-9635-1491diva-portal.org=authority-person:107874LeeSuhyunautStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0003-0836-416Xdiva-portal.org=authority-person:94858LouXuanhong1995-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0002-8309-5548diva-portal.org=authority-person:85133MilsteadDavid A.1970-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0002-7788-4129diva-portal.org=authority-person:83759MoaTorbjörn1953-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0002-7644-5984diva-portal.org=authority-person:83761PasuwanPatrawan1990-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0003-2987-2964diva-portal.org=authority-person:83763Pereira SanchezLaura1995-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0001-7913-3313diva-portal.org=authority-person:83764RichterStefan1988-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0001-6613-4448diva-portal.org=authority-person:102681ShaikhNabila W.1989-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0001-9358-3505diva-portal.org=authority-person:83765SilversteinSamuel B.1967-autStockholms universitet, Fysikumorcid.org=0000-0001-7734-7617diva-portal.org=authority-person:83766SjölinJörgen1968-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0002-5285-8995diva-portal.org=authority-person:83767StrandbergSara1977-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0001-7253-7497diva-portal.org=authority-person:83768StrübigAntonia1985-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0002-2382-6951diva-portal.org=authority-person:85134Valdés SanturioEduardo1984-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0001-9931-2896diva-portal.org=authority-person:83769ZwalinskiL.autStockholms universitetNaturvetenskapliga fakultetenFysikumpblStockholms universitetNaturvetenskapliga fakultetenOskar Klein-centrum för kosmopartikelfysik (OKC)pblCorrelations between flow and transverse momentum in Xe+Xe and Pb+Pb collisions at the LHC with the ATLAS detectorA probe of the heavy-ion initial state and nuclear deformationeng20232023-10-03T14:41:03https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-22177310.1103/PhysRevC.107.0549100010217000000012-s2.0-85164169793054910https://doi.org/10.1103/PhysRevC.107.054910textNatural SciencesPhysical SciencesSubatomic PhysicsNaturvetenskapFysikSubatomär fysikThe correlations between flow harmonics vn for n=2, 3, and 4 and mean transverse momentum [pT] in 129Xe+129Xe and 208Pb+208Pb collisions at √s=5.44 and 5.02 TeV, respectively, are measured using charged particles with the ATLAS detector. The correlations are potentially sensitive to the shape and size of the initial geometry, nuclear deformation, and initial momentum anisotropy. The effects from nonflow and centrality fluctuations are minimized, respectively, via a subevent cumulant method and an event-activity selection based on particle production at very forward rapidity. The vn−[pT] correlations show strong dependencies on centrality, harmonic number n, pT, and pseudorapidity range. Current models qualitatively describe the overall centrality- and system-dependent trends but fail to quantitatively reproduce all features of the data. In central collisions, where models generally show good agreement, the v2−[pT] correlations are sensitive to the triaxiality of the quadruple deformation. Comparison of the model with the Pb+Pb and Xe+Xe data confirms that the 129Xe nucleus is a highly deformed triaxial ellipsoid that has neither a prolate nor oblate shape. This provides strong evidence for a triaxial deformation of the 129Xe nucleus from high-energy heavy-ion collisions.Physical Review CCovering Nuclear Physics2469-99852469-99931075Published2899albo5064su2023-10-032023-10-03diva2:1802072refereedrefRefereedRefereegranskatFagfellevurdertarticleartArticle in journalArtikel i tidskriftArtikkel i tidsskriftarticleAadG.autAndreanStefio Y.1991-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0002-9766-2670diva-portal.org=authority-person:83752BackmanFilip1991-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0001-7489-9184diva-portal.org=authority-person:83753Barranco NavarroLaura1990-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0002-3380-8167diva-portal.org=authority-person:83754BohmChristian1946-autStockholms universitet, Fysikumorcid.org=0000-0003-3807-7831diva-portal.org=authority-person:83755ClémentChristophe1972-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0003-3122-3605diva-portal.org=authority-person:83756DunneKatherine1987-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0003-2626-2247diva-portal.org=authority-person:86268HellmanSten1956-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0002-5415-1600diva-portal.org=authority-person:83757Ingebretsen CarlsonTom1989-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0002-3699-8517diva-portal.org=authority-person:85205KimDongwon1989-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0002-9635-1491diva-portal.org=authority-person:107874LeeSuhyunautStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0003-0836-416Xdiva-portal.org=authority-person:94858LouXuanhong1995-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0002-8309-5548diva-portal.org=authority-person:85133MilsteadDavid A.1970-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0002-7788-4129diva-portal.org=authority-person:83759MoaTorbjörn1953-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0002-7644-5984diva-portal.org=authority-person:83761PasuwanPatrawan1990-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0003-2987-2964diva-portal.org=authority-person:83763Pereira SanchezLaura1995-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0001-7913-3313diva-portal.org=authority-person:83764RichterStefan1988-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0001-6613-4448diva-portal.org=authority-person:102681ShaikhNabila W.1989-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0001-9358-3505diva-portal.org=authority-person:83765SilversteinSamuel B.1967-autStockholms universitet, Fysikumorcid.org=0000-0001-7734-7617diva-portal.org=authority-person:83766SjölinJörgen1968-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0002-5285-8995diva-portal.org=authority-person:83767StrandbergSara1977-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0001-7253-7497diva-portal.org=authority-person:83768StrübigAntonia1985-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0002-2382-6951diva-portal.org=authority-person:85134Valdés SanturioEduardo1984-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0001-9931-2896diva-portal.org=authority-person:83769ZwalinskiL.autStockholms universitetNaturvetenskapliga fakultetenFysikumpblStockholms universitetNaturvetenskapliga fakultetenOskar Klein-centrum för kosmopartikelfysik (OKC)pblCross-section measurements for the production of a Z boson in association with high-transverse-momentum jets in pp collisions at √s = 13 TeV with the ATLAS detectoreng20232023-10-03T09:37:09https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-22177510.1007/JHEP06(2023)0800010352824000012-s2.0-8516316339280https://doi.org/10.1007/JHEP06(2023)080textElectroweak InteractionHadron-Hadron ScatteringNatural SciencesPhysical SciencesSubatomic PhysicsNaturvetenskapFysikSubatomär fysikCross-section measurements for a Z boson produced in association with high-transverse-momentum jets (pT ≥ 100 GeV) and decaying into a charged-lepton pair (e+e−, μ+μ−) are presented. The measurements are performed using proton–proton collisions at √s = 13 TeV corresponding to an integrated luminosity of 139 fb−1 collected by the ATLAS experiment at the LHC. Measurements of angular correlations between the Z boson and the closest jet are performed in events with at least one jet with pT ≥ 500 GeV. Event topologies of particular interest are the collinear emission of a Z boson in dijet events and a boosted Z boson recoiling against a jet. Fiducial cross sections are compared with state-of-the-art theoretical predictions. The data are found to agree with next-to-next-to-leading-order predictions by NNLOᴊᴇᴛ and with the next-to-leading-order multi-leg generators MADGRAPH5_AMC@NLO and SHERPA.Journal of High Energy Physics (JHEP)1126-67081029-847920236Published2895albo5064su2023-10-032023-10-03diva2:1801848refereedrefRefereedRefereegranskatFagfellevurdertarticleartArticle in journalArtikel i tidskriftArtikkel i tidsskriftarticleAadG.autAndreanStefio Y.1991-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0002-9766-2670diva-portal.org=authority-person:83752BackmanFilip1991-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0001-7489-9184diva-portal.org=authority-person:83753Barranco NavarroLaura1990-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0002-3380-8167diva-portal.org=authority-person:83754BohmChristian1946-autStockholms universitet, Fysikumorcid.org=0000-0003-3807-7831diva-portal.org=authority-person:83755ClémentChristophe1972-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0003-3122-3605diva-portal.org=authority-person:83756DunneKatherine1987-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0003-2626-2247diva-portal.org=authority-person:86268HellmanSten1956-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0002-5415-1600diva-portal.org=authority-person:83757Ingebretsen CarlsonTom1989-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0002-3699-8517diva-portal.org=authority-person:85205KimDongwon1989-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0002-9635-1491diva-portal.org=authority-person:107874LeeSuhyunautStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0003-0836-416Xdiva-portal.org=authority-person:94858LouXuanhong1995-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0002-8309-5548diva-portal.org=authority-person:85133MilsteadDavid A.1970-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0002-7788-4129diva-portal.org=authority-person:83759MoaTorbjörn1953-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0002-7644-5984diva-portal.org=authority-person:83761PasuwanPatrawan1990-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0003-2987-2964diva-portal.org=authority-person:83763Pereira SanchezLaura1995-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0001-7913-3313diva-portal.org=authority-person:83764RichterStefan1988-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0001-6613-4448diva-portal.org=authority-person:102681ShaikhNabila W.1989-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0001-9358-3505diva-portal.org=authority-person:83765SilversteinSamuel B.1967-autStockholms universitet, Fysikumorcid.org=0000-0001-7734-7617diva-portal.org=authority-person:83766SjölinJörgen1968-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0002-5285-8995diva-portal.org=authority-person:83767StrandbergSara1977-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0001-7253-7497diva-portal.org=authority-person:83768StrübigAntonia1985-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0002-2382-6951diva-portal.org=authority-person:85134Valdés SanturioEduardo1984-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0001-9931-2896diva-portal.org=authority-person:83769ZwalinskiL.autStockholms universitetNaturvetenskapliga fakultetenFysikumpblStockholms universitetNaturvetenskapliga fakultetenOskar Klein-centrum för kosmopartikelfysik (OKC)pblEvidence for the charge asymmetry in pp → tt- production at √s=13 TeV with the ATLAS detectoreng20232023-11-17T14:24:57https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-22371010.1007/JHEP08(2023)0770010623980000012-s2.0-8516932258277https://doi.org/10.1007/JHEP08(2023)077textHadron-Hadron ScatteringTop PhysicsNatural SciencesPhysical SciencesSubatomic PhysicsNaturvetenskapFysikSubatomär fysikInclusive and differential measurements of the top–antitop (<img src="http://www.diva-portal.org/cgi-bin/mimetex.cgi?t%5Cbar%7Bt%7D" data-classname="equation" />) charge asymmetry <img src="http://www.diva-portal.org/cgi-bin/mimetex.cgi?A_%7BC%7D%5E%7Bt%5Cbar%7Bt%7D%7D" data-classname="equation" data-title="" /> and the leptonic asymmetry <img src="http://www.diva-portal.org/cgi-bin/mimetex.cgi?A_%7BC%7D%5E%7B%5Cell%5Cbar%7B%5Cell%7D%7D" data-classname="equation" data-title="" /> are presented in proton–proton collisions at √s = 13 TeV recorded by the ATLAS experiment at the CERN Large Hadron Collider. The measurement uses the complete Run 2 dataset, corresponding to an integrated luminosity of 139 fb−1, combines data in the single-lepton and dilepton channels, and employs reconstruction techniques adapted to both the resolved and boosted topologies. A Bayesian unfolding procedure is performed to correct for detector resolution and acceptance effects. The combined inclusive <img src="http://www.diva-portal.org/cgi-bin/mimetex.cgi?t%5Cbar%7Bt%7D" data-classname="equation" data-title="" /> charge asymmetry is measured to be <img src="http://www.diva-portal.org/cgi-bin/mimetex.cgi?A_%7BC%7D%5E%7Bt%5Cbar%7Bt%7D%7D" data-classname="equation" data-title="" /> = 0.0068 ± 0.0015, which differs from zero by 4.7 standard deviations. Differential measurements are performed as a function of the invariant mass, transverse momentum and longitudinal boost of the <img src="http://www.diva-portal.org/cgi-bin/mimetex.cgi?t%5Cbar%7Bt%7D" data-classname="equation" data-title="" /> system. Both the inclusive and differential measurements are found to be compatible with the Standard Model predictions, at next-to-next-to-leading order in quantum chromodynamics perturbation theory with next-to-leading-order electroweak corrections. The measurements are interpreted in the framework of the Standard Model effective field theory, placing competitive bounds on several Wilson coefficients.Journal of High Energy Physics (JHEP)1126-67081029-847920238Published2935albo5064su2023-11-172023-11-17diva2:1812938refereedrefRefereedRefereegranskatFagfellevurdertarticleartArticle in journalArtikel i tidskriftArtikkel i tidsskriftarticleAadG.autAndreanStefio Y.1991-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0002-9766-2670diva-portal.org=authority-person:83752BackmanFilip1991-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0001-7489-9184diva-portal.org=authority-person:83753Barranco NavarroLaura1990-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0002-3380-8167diva-portal.org=authority-person:83754BohmChristian1946-autStockholms universitet, Fysikumorcid.org=0000-0003-3807-7831diva-portal.org=authority-person:83755ClémentChristophe1972-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0003-3122-3605diva-portal.org=authority-person:83756DunneKatherine1987-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0003-2626-2247diva-portal.org=authority-person:86268HellmanSten1956-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0002-5415-1600diva-portal.org=authority-person:83757Ingebretsen CarlsonTom1989-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0002-3699-8517diva-portal.org=authority-person:85205KimDongwon1989-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0002-9635-1491diva-portal.org=authority-person:107874LeeSuhyunautStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0003-0836-416Xdiva-portal.org=authority-person:94858LouXuanhong1995-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0002-8309-5548diva-portal.org=authority-person:85133MilsteadDavid A.1970-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0002-7788-4129diva-portal.org=authority-person:83759MoaTorbjörn1953-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0002-7644-5984diva-portal.org=authority-person:83761PasuwanPatrawan1990-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0003-2987-2964diva-portal.org=authority-person:83763Pereira SanchezLaura1995-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0001-7913-3313diva-portal.org=authority-person:83764RichterStefan1988-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0001-6613-4448diva-portal.org=authority-person:102681ShaikhNabila W.1989-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0001-9358-3505diva-portal.org=authority-person:83765SilversteinSamuel B.1967-autStockholms universitet, Fysikumorcid.org=0000-0001-7734-7617diva-portal.org=authority-person:83766SjölinJörgen1968-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0002-5285-8995diva-portal.org=authority-person:83767StrandbergSara1977-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0001-7253-7497diva-portal.org=authority-person:83768StrübigAntonia1985-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0002-2382-6951diva-portal.org=authority-person:85134Valdés SanturioEduardo1984-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0001-9931-2896diva-portal.org=authority-person:83769ZwalinskiL.autStockholms universitetNaturvetenskapliga fakultetenFysikumpblStockholms universitetNaturvetenskapliga fakultetenOskar Klein-centrum för kosmopartikelfysik (OKC)pblMeasurement of electroweak Z(νν¯)γjj production and limits on anomalous quartic gauge couplings in pp collisions at √s = 13 TeV with the ATLAS detectoreng20232023-10-02T12:18:21https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-22162110.1007/JHEP06(2023)0820010352626000012-s2.0-8516208070982https://doi.org/10.1007/JHEP06(2023)082textElectroweak InteractionHadron-Hadron ScatteringNatural SciencesPhysical SciencesSubatomic PhysicsNaturvetenskapFysikSubatomär fysikThe electroweak production of <img src="http://www.diva-portal.org/cgi-bin/mimetex.cgi?Z(v%5Coverline%7Bv%7D)%5Cgamma" data-classname="equation" /> in association with two jets is studied in a regime with a photon of high transverse momentum above 150 GeV using proton–proton collisions at a centre-of-mass energy of 13 TeV at the Large Hadron Collider. The analysis uses a data sample with an integrated luminosity of 139 fb−1collected by the ATLAS detector during the 2015–2018 LHC data-taking period. This process is an important probe of the electroweak symmetry breaking mechanism in the Standard Model and is sensitive to quartic gauge boson couplings via vector-boson scattering. The fiducial <img src="http://www.diva-portal.org/cgi-bin/mimetex.cgi?Z(v%5Coverline%7Bv%7D)%5Cgamma%20jj" data-classname="equation" /> cross section for electroweak production is measured to be <img src="http://www.diva-portal.org/cgi-bin/mimetex.cgi?0.77_%7B-0.30%7D%5E%7B+0.34%7D" data-classname="equation" data-title="" /> fb and is consistent with the Standard Model prediction. Evidence of electroweak <img src="http://www.diva-portal.org/cgi-bin/mimetex.cgi?Z(v%5Coverline%7Bv%7D)%5Cgamma%20jj" data-classname="equation" data-title="" /> production is found with an observed significance of 3.2σ for the background-only hypothesis, compared with an expected significance of 3.7σ. The combination of this result with the previously published ATLAS observation of electroweak <img src="http://www.diva-portal.org/cgi-bin/mimetex.cgi?Z(v%5Coverline%7Bv%7D)%5Cgamma%20jj" data-classname="equation" data-title="" /> production yields an observed (expected) signal significance of 6.3σ (6.6σ). Limits on anomalous quartic gauge boson couplings are obtained in the framework of effective field theory with dimension-8 operators.Journal of High Energy Physics (JHEP)1126-67081029-847920236Published2911albo5064su2023-10-022023-10-02diva2:1801585refereedrefRefereedRefereegranskatFagfellevurdertarticleartArticle in journalArtikel i tidskriftArtikkel i tidsskriftarticleAadG.autAndreanStefio Y.1991-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0002-9766-2670diva-portal.org=authority-person:83752BackmanFilip1991-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0001-7489-9184diva-portal.org=authority-person:83753Barranco NavarroLaura1990-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0002-3380-8167diva-portal.org=authority-person:83754BohmChristian1946-autStockholms universitet, Fysikumorcid.org=0000-0003-3807-7831diva-portal.org=authority-person:83755ClémentChristophe1972-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0003-3122-3605diva-portal.org=authority-person:83756DunneKatherine1987-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0003-2626-2247diva-portal.org=authority-person:86268HellmanSten1956-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0002-5415-1600diva-portal.org=authority-person:83757Ingebretsen CarlsonTom1989-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0002-3699-8517diva-portal.org=authority-person:85205KimDongwon1989-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0002-9635-1491diva-portal.org=authority-person:107874LeeSuhyunautStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0003-0836-416Xdiva-portal.org=authority-person:94858LouXuanhong1995-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0002-8309-5548diva-portal.org=authority-person:85133MilsteadDavid A.1970-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0002-7788-4129diva-portal.org=authority-person:83759MoaTorbjörn1953-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0002-7644-5984diva-portal.org=authority-person:83761PasuwanPatrawan1990-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0003-2987-2964diva-portal.org=authority-person:83763Pereira SanchezLaura1995-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0001-7913-3313diva-portal.org=authority-person:83764RichterStefan1988-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0001-6613-4448diva-portal.org=authority-person:102681ShaikhNabila W.1989-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0001-9358-3505diva-portal.org=authority-person:83765SilversteinSamuel B.1967-autStockholms universitet, Fysikumorcid.org=0000-0001-7734-7617diva-portal.org=authority-person:83766SjölinJörgen1968-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0002-5285-8995diva-portal.org=authority-person:83767StrandbergSara1977-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0001-7253-7497diva-portal.org=authority-person:83768StrübigAntonia1985-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0002-2382-6951diva-portal.org=authority-person:85134Valdés SanturioEduardo1984-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0001-9931-2896diva-portal.org=authority-person:83769ZwalinskiL.autStockholms universitetNaturvetenskapliga fakultetenFysikumpblStockholms universitetNaturvetenskapliga fakultetenOskar Klein-centrum för kosmopartikelfysik (OKC)pblMeasurement of exclusive pion pair production in proton–proton collisions at √s=7TeV with the ATLAS detectoreng20232023-12-27T09:59:11https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-22459110.1140/epjc/s10052-023-11700-x0010624445000022-s2.0-85165547448627https://doi.org/10.1140/epjc/s10052-023-11700-xtextNatural SciencesPhysical SciencesSubatomic PhysicsNaturvetenskapFysikSubatomär fysikThe exclusive production of pion pairs in the process pp→ppπ+π− has been measured at √s=7TeV with the ATLAS detector at the LHC, using 80μb−1 of low-luminosity data. The pion pairs were detected in the ATLAS central detector while outgoing protons were measured in the forward ATLAS ALFA detector system. This represents the first use of proton tagging to measure an exclusive hadronic final state at the LHC. A cross-section measurement is performed in two kinematic regions defined by the proton momenta, the pion rapidities and transverse momenta, and the pion–pion invariant mass. Cross-section values of 4.8±1.0 (stat) <img src="http://www.diva-portal.org/cgi-bin/mimetex.cgi?_%7B-0.2%7D%5E%7B+0.3%7D" data-classname="equation" data-title="" /> (syst) μb and 9±6 (stat) <img src="http://www.diva-portal.org/cgi-bin/mimetex.cgi?_%7B-2%7D%5E%7B+2%7D" data-classname="equation" data-title="" /> (syst) μb are obtained in the two regions; they are compared with theoretical models and provide a demonstration of the feasibility of measurements of this type.European Physical Journal C1434-60441434-6052837Published2930albo5064su2023-12-272023-12-27diva2:1822653refereedrefRefereedRefereegranskatFagfellevurdertarticleartArticle in journalArtikel i tidskriftArtikkel i tidsskriftarticleAadG.autAndreanStefio Y.1991-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0002-9766-2670diva-portal.org=authority-person:83752BackmanFilip1991-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0001-7489-9184diva-portal.org=authority-person:83753Barranco NavarroLaura1990-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0002-3380-8167diva-portal.org=authority-person:83754BohmChristian1946-autStockholms universitet, Fysikumorcid.org=0000-0003-3807-7831diva-portal.org=authority-person:83755ClémentChristophe1972-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0003-3122-3605diva-portal.org=authority-person:83756DunneKatherine1987-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0003-2626-2247diva-portal.org=authority-person:86268HellmanSten1956-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0002-5415-1600diva-portal.org=authority-person:83757Ingebretsen CarlsonTom1989-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0002-3699-8517diva-portal.org=authority-person:85205KimDongwon1989-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0002-9635-1491diva-portal.org=authority-person:107874LeeSuhyunautStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0003-0836-416Xdiva-portal.org=authority-person:94858LouXuanhong1995-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0002-8309-5548diva-portal.org=authority-person:85133MilsteadDavid A.1970-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0002-7788-4129diva-portal.org=authority-person:83759MoaTorbjörn1953-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0002-7644-5984diva-portal.org=authority-person:83761PasuwanPatrawan1990-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0003-2987-2964diva-portal.org=authority-person:83763Pereira SanchezLaura1995-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0001-7913-3313diva-portal.org=authority-person:83764RichterStefan1988-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0001-6613-4448diva-portal.org=authority-person:102681ShaikhNabila W.1989-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0001-9358-3505diva-portal.org=authority-person:83765SilversteinSamuel B.1967-autStockholms universitet, Fysikumorcid.org=0000-0001-7734-7617diva-portal.org=authority-person:83766SjölinJörgen1968-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0002-5285-8995diva-portal.org=authority-person:83767StrandbergSara1977-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0001-7253-7497diva-portal.org=authority-person:83768StrübigAntonia1985-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0002-2382-6951diva-portal.org=authority-person:85134Valdés SanturioEduardo1984-autStockholms universitet, FysikumStockholms universitet, Oskar Klein-centrum för kosmopartikelfysik (OKC)orcid.org=0000-0001-9931-2896diva-portal.org=authority-person:83769ZwalinskiL.autStockholms universitetNaturvetenskapliga fakultetenFysikumpblStockholms universitetNaturvetenskapliga fakultetenOskar Klein-centrum för kosmopartikelfysik (OKC)pblMeasurement of muon pairs produced via 𝛾⁢𝛾 scattering in nonultraperipheral Pb+Pb collisions at √𝑠𝑁⁢𝑁=5.02 TeV with the ATLAS detectoreng20232024-06-12T14:41:17https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-23081710.1103/PhysRevC.107.0549070010213922000012-s2.0-85166613350054907https://doi.org/10.1103/PhysRevC.107.054907textNatural SciencesPhysical SciencesSubatomic PhysicsNaturvetenskapFysikSubatomär fysikResults of a measurement of dimuon photoproduction in nonultraperipheral Pb+Pb collisions at √𝑠𝑁⁢𝑁=5.02 TeV are presented. The measurement uses ATLAS data from the 2015 and 2018 Pb+Pb data-taking periods at the LHC with an integrated luminosity of 1.94nb−1. The 𝛾⁢𝛾→𝜇+⁢𝜇− pairs are identified via selections on pair momentum asymmetry and acoplanarity. Differential cross sections for dimuon production are measured in different centrality, average muon momentum, and pair rapidity intervals as functions of acoplanarity and 𝑘⊥, the transverse momentum kick of one muon relative to the other. Measurements are also made as a function of the rapidity separation of the muons and the angle of the muon pair relative to the second-order event plane to test whether magnetic fields generated in the quark-gluon plasma affect the measured muons. A prior observation of a centrality-dependent broadening of the acoplanarity distribution is confirmed. Furthermore, the improved precision of the measurement reveals a depletion in the number of pairs having small acoplanarity or 𝑘⊥ values in more central collisions. The acoplanarity distributions in a given centrality interval are observed to vary with the mean 𝑝T of the muons in the pair, but the 𝑘⊥ distributions do not. Comparisons with recent theoretical predictions are made. The predicted trends associated with effects of magnetic fields on the dimuons are not observed.Physical Review CCovering Nuclear Physics2469-99852469-99931075Published2898albo5064su2024-06-122024-06-12diva2:1868884