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Combination of inclusive top-quark pair production cross-section measurements using ATLAS and CMS data at √s=7 and 8 TeV
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: 52442023 (English)In: Journal of High Energy Physics (JHEP), ISSN 1126-6708, E-ISSN 1029-8479, Vol. 2023, no 7, article id 213Article in journal (Refereed) Published
Abstract [en]

A combination of measurements of the inclusive top-quark pair production cross-section performed by ATLAS and CMS in proton–proton collisions at centre-of-mass energies of 7 and 8 TeV at the LHC is presented. The cross-sections are obtained using top-quark pair decays with an opposite-charge electron–muon pair in the final state and with data corresponding to an integrated luminosity of about 5 fb−1 at √s = 7 TeV and about 20 fb−1 at √s = 8 TeV for each experiment. The combined cross-sections are determined to be 178.5 ± 4.7 pb at √s = 7 TeV and pb at √s = 8 TeV with a correlation of 0.41, using a reference top-quark mass value of 172.5 GeV. The ratio of the combined cross-sections is determined to be R8/7 = 1.363 ± 0.032. The combined measured cross-sections and their ratio agree well with theory calculations using several parton distribution function (PDF) sets. The values of the top-quark pole mass (with the strong coupling fixed at 0.118) and the strong coupling (with the top-quark pole mass fixed at 172.5 GeV) are extracted from the combined results by fitting a next-to-next-to-leading-order plus next-to-next-to-leading-log QCD prediction to the measurements. Using a version of the NNPDF3.1 PDF set containing no top-quark measurements, the results obtained are = GeV and αs(mZ)=.

Place, publisher, year, edition, pages
2023. Vol. 2023, no 7, article id 213
Keywords [en]
Hadron-Hadron Scattering, Top Physics
National Category
Subatomic Physics
Identifiers
URN: urn:nbn:se:su:diva-224205DOI: 10.1007/JHEP07(2023)213ISI: 001058564200001OAI: oai:DiVA.org:su-224205DiVA, id: diva2:1817372
Available from: 2023-12-06 Created: 2023-12-06 Last updated: 2023-12-06Bibliographically 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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Department of PhysicsThe Oskar Klein Centre for Cosmo Particle Physics (OKC)
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Subatomic Physics

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