Combination of inclusive top-quark pair production cross-section measurements using ATLAS and CMS data at √s = 7 and 8 TeV
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13130_2023_Article_21425.pdf
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Author(s)
Aad, G.
Abbott, B.
Abbott, D. C.
Abed Abud, A.
Abeling, K.
Abhayasinghe, D. K.
Abidi, S. H.
Aboulhorma, A.
Abramowicz, H.
Abreu, H.
Date Issued
July 27, 2023
Publisher
Springer Berlin Heidelberg
Citation
Journal of High Energy Physics. 2023 Jul 27;2023(7):213
Version
Final published version
Abstract
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
$$ \sqrt{s} $$
= 7 TeV and about 20 fb−1 at
s
$$ \sqrt{s} $$
= 8 TeV for each experiment. The combined cross-sections are determined to be 178.5 ± 4.7 pb at
s
$$ \sqrt{s} $$
= 7 TeV and
243.3
−
5.9
+
6.0
$$ {243.3}_{-5.9}^{+6.0} $$
pb at
s
$$ \sqrt{s} $$
= 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
m
t
pole
=
173.4
−
2.0
+
1.8
$$ {m}_t^{\textrm{pole}}={173.4}_{-2.0}^{+1.8} $$
GeV and
α
s
m
Z
=
0.1170
−
0.0018
+
0.0021
$$ {\alpha}_{\textrm{s}}\left({m}_Z\right)={0.1170}_{-0.0018}^{+0.0021} $$
.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Terms of Use
Creative Commons Attribution
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DOI of Published Version
https://doi.org/10.1007/JHEP07(2023)213
