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Differential tt¯ cross-section measurements using boosted top quarks in the all-hadronic final state with 139 fb1 of ATLAS data
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: 29052023 (English)In: Journal of High Energy Physics (JHEP), ISSN 1126-6708, E-ISSN 1029-8479, Vol. 2023, no 4, article id 080Article in journal (Refereed) Published
Abstract [en]

Measurements of single-, double-, and triple-differential cross-sections are presented for boosted top-quark pair-production in 13 TeV proton–proton collisions recorded by the ATLAS detector at the LHC. The top quarks are observed through their hadronic decay and reconstructed as large-radius jets with the leading jet having transverse momentum (pT) greater than 500 GeV. The observed data are unfolded to remove detector effects. The particle-level cross-section, multiplied by the branching fraction and measured in a fiducial phase space defined by requiring the leading and second-leading jets to have pT > 500 GeV and pT > 350 GeV, respectively, is 331 ± 3(stat.) ± 39(syst.) fb. This is approximately 20% lower than the prediction of fb by POWHEG+PYTHIA 8 with next-to-leading-order (NLO) accuracy but consistent within the theoretical uncertainties. Results are also presented at the parton level, where the effects of top-quark decay, parton showering, and hadronization are removed such that they can be compared with fixed-order next-to-next-to-leading-order (NNLO) calculations. The parton-level cross-section, measured in a fiducial phase space similar to that at particle level, is 1.94 ± 0.02(stat.) ± 0.25(syst.) pb. This agrees with the NNLO prediction of pb. Reasonable agreement with the differential cross-sections is found for most NLO models, while the NNLO calculations are generally in better agreement with the data. The differential cross-sections are interpreted using a Standard Model effective field-theory formalism and limits are set on Wilson coefficients of several four-fermion operators.

Place, publisher, year, edition, pages
2023. Vol. 2023, no 4, article id 080
Keywords [en]
Hadron-Hadron Scattering, Jet Substructure and Boosted Jets, Top Physics
National Category
Subatomic Physics
Identifiers
URN: urn:nbn:se:su:diva-221779DOI: 10.1007/JHEP04(2023)080ISI: 001022682600001Scopus ID: 2-s2.0-85156104827OAI: oai:DiVA.org:su-221779DiVA, id: diva2:1801649
Available from: 2023-10-02 Created: 2023-10-02 Last updated: 2023-10-02Bibliographically approved

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Andrean, Stefio Y.Backman, FilipBarranco Navarro, LauraBohm, ChristianClément, ChristopheDunne, KatherineHellman, StenIngebretsen Carlson, TomLou, XuanhongMilstead, David A.Moa, TorbjörnPasuwan, PatrawanPereira Sanchez, LauraShaikh, Nabila W.Silverstein, Samuel B.Sjölin, JörgenStrandberg, SaraStrübig, AntoniaValdés Santurio, Eduardo

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Andrean, Stefio Y.Backman, FilipBarranco Navarro, LauraBohm, ChristianClément, ChristopheDunne, KatherineHellman, StenIngebretsen Carlson, TomLou, XuanhongMilstead, David A.Moa, TorbjörnPasuwan, PatrawanPereira Sanchez, LauraShaikh, Nabila W.Silverstein, Samuel B.Sjölin, JörgenStrandberg, SaraStrübig, AntoniaValdés Santurio, Eduardo
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Subatomic Physics

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