Measurement of the top quark polarization and t¯t spin correlations using dilepton final states in proton-proton collisions at √s=13  TeV; Physical Review D; Vol. 100, iss. 7

Measurement of the top quark polarization and t¯t spin correlations using dilepton final states in proton-proton collisions at √s=13  TeV; Physical Review D; Vol. 100, iss. 7

Detaylı Bibliyografya
Parent link:Physical Review D: particles, fields, gravitation, and cosmology.— , 1970-
Vol. 100, iss. 7.— 2019.— [072002, 39 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, Asilar E. Ece, Bergauer T. Thomas, Zhokin A. S. Aleksandr Sergeevich, Babaev A. A. Anton Anatoljevich, Yuzhakov A. D. Aleksandr Dmitrievich, Okhotnikov V. V. Vitaly Vladimirovich
Özet:Title screen
Measurements of the top quark polarization and top quark pair (t¯t) spin correlations are presented using events containing two oppositely charged leptons (e+e−, e±μ∓, or μ+μ−) produced in proton-proton collisions at a center-of-mass energy of 13 TeV. The data were recorded by the CMS experiment at the LHC in 2016 and correspond to an integrated luminosity of 35.9  fb−1. A set of parton-level normalized differential cross sections, sensitive to each of the independent coefficients of the spin-dependent parts of the t¯t production density matrix, is measured for the first time at 13 TeV. The measured distributions and extracted coefficients are compared with standard model predictions from simulations at next-to-leading-order (NLO) accuracy in quantum chromodynamics (QCD), and from NLO QCD calculations including electroweak corrections. All measurements are found to be consistent with the expectations of the standard model. The normalized differential cross sections are used in fits to constrain the anomalous chromomagnetic and chromoelectric dipole moments of the top quark to −0.24<CtG/Λ2<0.07  TeV−2 and −0.33<CItG/Λ2<0.20  TeV−2, respectively, at the 95% confidence level.
Режим доступа: по договору с организацией-держателем ресурса
Dil:İngilizce
Baskı/Yayın Bilgisi: 2019
Konular:
электронный ресурс
труды учёных ТПУ
протон-протонные соударения
Online Erişim:https://doi.org/10.1103/PhysRevD.100.072002
Materyal Türü: Elektronik Kitap Bölümü
KOHA link:https://koha.lib.tpu.ru/cgi-bin/koha/opac-detail.pl?biblionumber=663571

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