Combination of inclusive top-quark pair production cross-section measurements using ATLAS and CMS data at √s = 7 and 8 TeV

Belyaev, A.V.; Boos, E.; Bunichev, V.; Dubinin, M.; Dudko, L.; Ershov, A.A.; Gladilin, L.K.; Klyukhin, V.; Korneeva, N.; Korotkova, N.; Kramarenko, V.A.; Obraztsov, S.; Perfilov, M.; Savrin, V.; Smirnova, L.N.; Volkov, P.; ATLAS, C.; CMS, C.

Авторы: Belyaev A.V., Boos E., Bunichev V., Dubinin M., Dudko L., Ershov A.A., Gladilin L.K., Klyukhin V., Korneeva N., Korotkova N., Kramarenko V.A., Obraztsov S., Perfilov M., Savrin V., Smirnova L.N., Volkov P., ATLAS Collaboration, CMS Collaboration
Журнал: Journal of High Energy Physics
Том: 2023
Номер: 07
Год издания: 2023
Издательство: IOP Publishing
Местоположение издательства: [Bristol, UK], England
Первая страница: 213
DOI: 10.1007/JHEP07(2023)213
Аннотация: 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 m_t^pole = 173.4+1.8−2.0 GeV and α_s(m_Z) = 0.1170+0.0021−0.0018.
Добавил в систему: Клюхин Вячеслав Иванович

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Combination of inclusive top-quark pair production cross-section measurements using ATLAS and CMS data at √s = 7 and 8 TeVстатья Исследовательская статья

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