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Search for long-lived, massive particles in events with displaced vertices and multiple jets in pp collisions at √s = 13 TeV with the ATLAS detector
Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).ORCID iD: 0000-0002-9766-2670
Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).ORCID iD: 0000-0001-7489-9184
Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).ORCID iD: 0000-0002-3380-8167
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Number of Authors: 29362023 (English)In: Journal of High Energy Physics (JHEP), ISSN 1126-6708, E-ISSN 1029-8479, Vol. 2023, no 6, article id 200Article in journal (Refereed) Published
Abstract [en]

A search for long-lived particles decaying into hadrons is presented. The analysis uses 139 fb−1 of pp collision data collected at √s = 13 TeV by the ATLAS detector at the LHC using events that contain multiple energetic jets and a displaced vertex. The search employs dedicated reconstruction techniques that significantly increase the sensitivity to long-lived particles decaying in the ATLAS inner detector. Background estimates for Standard Model processes and instrumental effects are extracted from data. The observed event yields are compatible with those expected from background processes. The results are used to set limits at 95% confidence level on model-independent cross sections for processes beyond the Standard Model, and on scenarios with pair-production of supersymmetric particles with long-lived electroweakinos that decay via a small R-parity-violating coupling. The pair-production of electroweakinos with masses below 1.5 TeV is excluded for mean proper lifetimes in the range from 0.03 ns to 1 ns. When produced in the decay of m() = 2.4 TeV gluinos, electroweakinos with m() = 1.5 TeV are excluded with lifetimes in the range of 0.02 ns to 4 ns. 

Place, publisher, year, edition, pages
2023. Vol. 2023, no 6, article id 200
Keywords [en]
Beyond Standard Model, Hadron-Hadron Scattering, Supersymmetry
National Category
Subatomic Physics
Identifiers
URN: urn:nbn:se:su:diva-221628DOI: 10.1007/JHEP06(2023)200ISI: 001035462900001Scopus ID: 2-s2.0-85166271763OAI: oai:DiVA.org:su-221628DiVA, id: diva2:1800593
Available from: 2023-09-27 Created: 2023-09-27 Last updated: 2023-09-27Bibliographically approved

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Andrean, Stefio Y.Backman, FilipBarranco Navarro, LauraBohm, ChristianClément, ChristopheDunne, KatherineHellman, StenIngebretsen Carlson, TomKim, DongwonLee, SuhyunLou, XuanhongMilstead, David A.Moa, TorbjörnPasuwan, PatrawanPereira Sanchez, LauraRichter, StefanSilverstein, Samuel B.Sjölin, JörgenStrandberg, SaraStrübig, AntoniaValdés Santurio, Eduardo

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Andrean, Stefio Y.Backman, FilipBarranco Navarro, LauraBohm, ChristianClément, ChristopheDunne, KatherineHellman, StenIngebretsen Carlson, TomKim, DongwonLee, SuhyunLou, XuanhongMilstead, David A.Moa, TorbjörnPasuwan, PatrawanPereira Sanchez, LauraRichter, StefanSilverstein, Samuel B.Sjölin, JörgenStrandberg, SaraStrübig, AntoniaValdés Santurio, Eduardo
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Department of PhysicsThe Oskar Klein Centre for Cosmo Particle Physics (OKC)
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Subatomic Physics

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