@misc{10481/86126,
year = {2023},
month = {7},
url = {https://hdl.handle.net/10481/86126},
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 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 243.3+6.0
−5.9 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 mpole
t = 173.4+1.8
−2.0 GeV
and αs(mZ ) = 0.1170+0.0021
−0.0018.},
organization = {CERN},
organization = {MICINN, Spain},
organization = {COST},
organization = {ERC},
organization = {ERDF},
organization = {Horizon 2020},
organization = {Marie Skłodowska-Curie Actions},
organization = {European Union},
organization = {La Caixa Banking Foundation},
organization = {CERCA Programme Generalitat de Catalunya},
organization = {PROMETEO},
organization = {GenT Programmes Generalitat Valenciana,
Spain},
organization = {PIC (Spain)},
organization = {PCTI (Spain)},
organization = {Horizon 2020 Grant 675440, 724704, 752730, 758316, 765710, 824093, 884104},
organization = {COST Action CA16108 (European Union)},
organization = {MCIN/AEI/10.13039/501100011033},
organization = {ERDF “a way of making Europe”},
organization = {Programa
Estatal de Fomento de la Investigación Científica y Técnica de Excelencia María de Maeztu 
MDM-2017-0765},
organization = {Programa Severo Ochoa del Principado de Asturias (Spain)},
publisher = {Springer Nature},
keywords = {Hadron-Hadron Scattering},
keywords = {Top Physics},
title = {Combination of inclusive top-quark pair production cross-section measurements using ATLAS and CMS data at √s = 7 and 8 TeV},
doi = {10.1007/JHEP07(2023)213},
author = {Atlas Collaboration and Aad, G. and Aguilar Saavedra, Juan Antonio and Rodríguez Chala, Mikael and CMS collaboration},
}