Measurement of top quark pair production in association with a Z boson in proton-proton collisions at √s = 13 TeV

Measurement of top quark pair production in association with a Z boson in proton-proton collisions at √s = 13 TeV

Detaylı Bibliyografya
Parent link:Journal of High Energy Physics
Vol. 2020, iss. 3.— 2020.— [56, 49 p.]
Müşterek Yazar: Национальный исследовательский Томский политехнический университет Исследовательская школа физики высокоэнергетических процессов
Diğer Yazarlar: Sirunyan A. M., Tumasyan A. R., Adam W. Wolfgang, Ambrogi F. Federico, Tyurin N. E. Nikolay Evgenjevich, Babaev A. A. Anton Anatoljevich
Özet:Title screen
A measurement of the inclusive cross section of top quark pair production in association with a Z boson using proton-proton collisions at a center-of-mass energy of 13 TeV at the LHC is performed. The data sample corresponds to an integrated luminosity of 77.5 fb−1, collected by the CMS experiment during 2016 and 2017. The measurement is performed using final states containing three or four charged leptons (electrons or muons), and the Z boson is detected through its decay to an oppositely charged lepton pair. The production cross section is measured to be σ(tt¯Ztt¯Z) = 0.95 ± 0.05 (stat) ± 0.06 (syst) pb. For the first time, differential cross sections are measured as functions of the transverse momentum of the Z boson and the angular distribution of the negatively charged lepton from the Z boson decay. The most stringent direct limits to date on the anomalous couplings of the top quark to the Z boson are presented, including constraints on the Wilson coefficients in the framework of the standard model effective field theory.
Baskı/Yayın Bilgisi: 2020
Konular:
электронный ресурс
труды учёных ТПУ
Hadron-Hadron scattering (experiments)
Top physics
Online Erişim:https://doi.org/10.1007/JHEP03(2020)056
Materyal Türü: Elektronik Kitap Bölümü
KOHA link:https://koha.lib.tpu.ru/cgi-bin/koha/opac-detail.pl?biblionumber=666238

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