Combination of inclusive top-quark pair production cross-section measurements using ATLAS and CMS data at $$ \sqrt{s} $$ = 7 and 8 TeV
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 $$\sqrt{s}$$ = 7 TeV and about 20 fb–1 at $$\sqrt{s}$$ = 8 TeV for each experiment. The combined cross-sections are determined to be 178.5 ± 4.7 pb at $$\sqrt{s}$$ = 7 TeV and 243.3$$^{+6.0}_{-5.9}$$ pb at $$\sqrt{s}$$ = 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 $$m^{\text{pole}}_{\text{t}}$$ = $$173.4^{+1.8}_{-2.0}$$ GeV and $$α_{s}$$ ($$m_{Z}$$) = $$0.1170^{+0.0021}_{-0.0018}$$.
- Research Organization:
- Argonne National Laboratory (ANL), Argonne, IL (United States); SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States); Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States); Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States); Brookhaven National Laboratory (BNL), Upton, NY (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), High Energy Physics (HEP)
- Contributing Organization:
- ATLAS Collaboration; CMS Collaboration
- Grant/Contract Number:
- AC02-07CH11359
- OSTI ID:
- 2217208
- Report Number(s):
- CERN-EP-2021-222; CMS-TOP-18-014; CERN-LPCC-2022-03; FERMILAB-PUB-23-733-CMS; arXiv:2205.13830; oai:inspirehep.net:2088291
- Journal Information:
- Journal of High Energy Physics (Online), Vol. 2023, Issue 7; ISSN 1029-8479
- Publisher:
- Springer NatureCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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