Measurement of the tt¯tt¯ production cross section, the top quark mass, and the strong coupling constant using dilepton events in pp collisions at s√=13TeV; European Physical Journal C; Vol. 79, iss. 5

Measurement of the tt¯tt¯ production cross section, the top quark mass, and the strong coupling constant using dilepton events in pp collisions at s√=13TeV; European Physical Journal C; Vol. 79, iss. 5

Dettagli Bibliografici
Parent link:European Physical Journal C
Vol. 79, iss. 5.— 2019.— [368, 36 p.]
Ente Autore: Национальный исследовательский Томский политехнический университет Исследовательская школа физики высокоэнергетических процессов
Altri autori: Sirunyan A. M., Tumasyan A. R., Adam W. Wolfgang, Ambrogi F. Federico, Asilar E. Ece, Bergauer T. Thomas, Babaev A. A. Anton Anatoljevich, Okhotnikov V. V. Vitaly Vladimirovich
Riassunto:Title screen
A measurement of the top quark-antiquark pair production cross section σtt¯σtt¯ in proton-proton collisions at a centre-of-mass energy of 13TeVTeV is presented. The data correspond to an integrated luminosity of 35.9fb−135.9fb−1, recorded by the CMS experiment at the CERN LHC in 2016. Dilepton events (ee ±± μμ ∓∓, μ+μ−μ+μ−, e+e−e+e−) are selected and the cross section is measured from a likelihood fit. For a top quark mass parameter in the simulation of mMCt=172.5GeVmtMC=172.5GeV the fit yields a measured cross section σtt¯=803±2(stat)±25(syst)±20(lumi)pbσtt¯=803±2(stat)±25(syst)±20(lumi)pb, in agreement with the expectation from the standard model calculation at next-to-next-to-leading order. A simultaneous fit of the cross section and the top quark mass parameter in the POWHEG simulation is performed. The measured value of mMCt=172.33±0.14(stat)+0.66−0.72(syst)GeVmtMC=172.33±0.14(stat)−0.72+0.66(syst)GeV is in good agreement with previous measurements. The resulting cross section is used, together with the theoretical prediction, to determine the top quark mass and to extract a value of the strong coupling constant with different sets of parton distribution functions.
Lingua:inglese
Pubblicazione: 2019
Soggetti:
электронный ресурс
труды учёных ТПУ
протон-протонные соударения
Accesso online:https://doi.org/10.1140/epjc/s10052-019-6863-8
Natura: Elettronico Capitolo di libro
KOHA link:https://koha.lib.tpu.ru/cgi-bin/koha/opac-detail.pl?biblionumber=663855

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