Combination of inclusive top-quark pair production cross-section measurements using ATLAS and CMS data at √s=7 and 8 TeV
Date
2023
Authors
Aad, G.
Abbott, B.
Abbott, D.C.
Abed Abud, A.
Abeling, K.
Abhayasinghe, D.K.
Abidi, S.H.
Aboulhorma, A.
Abramowicz, H.
Abreu, H.
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Journal article
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Journal of High Energy Physics (JHEP), 2023; 2023(7):213-1-213-64
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Abstract
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 8TeV at the LHC is presented. The cross-sections are obtained using topquark 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 p s = 7 TeV and about 20 fb -1 at p s = 8TeV for each experiment. The combined cross-sections are determined to be 178.5 +/- 4.7 pb at p s = 7 TeV and 243.3+6.0 -5.9 pb at p s = 8TeV with a correlation of 0.41, using a reference top-quark mass value of 172.5 GeV. The ratio of the combined crosssections 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-toleading- log QCD prediction to the measurements. Using a version of the NNPDF3.1 PDF set containing no top-quark measurements, the results obtained are m pole t = 173.4+1.8 -2.0 GeV and is proportional to s(mZ) = 0.1170+0.0021 -0.0018.
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Open Access, Copyright CERN, for the benefit of the ATLAS-CMS Collaboration. This article is distributed under the terms of the Creative Commons Attribution License (CC-BY 4.0), which permits any use, distribution and reproduction in any medium, provided the original author(s) and source are credited.