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Measurement of the top quark polarization and t t spin correlations using dilepton final states in proton-proton collisions at s =13 TeV

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2019
PhysRevD.100.072002.pdf (1.764Mb)
Authors
Sirunyan, A M
Tumasyan, A
Adam, W
Ambrogi, F
Adžić, Petar
Ćirković, Predrag
Devetak, Damir
Đorđević, Miloš
Milenović, Predrag
Milošević, Jovan
Contributors
CMS Collaboration
CMS Collaboration (ukupan broj autora: 2293)
Article (Published version)
,
© 2019 CERN
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Abstract
Measurements of the top quark polarization and top quark pair (tt) 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 tt 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 const...rain the anomalous chromomagnetic and chromoelectric dipole moments of the top quark to -0.24<CtG/Λ2<0.07 TeV-2 and -0.33<CtGI/Λ2<0.20 TeV-2, respectively, at the 95% confidence level. © 2019 CERN.

Source:
Physical Review D, 2019, 100, 7

DOI: 10.1103/PhysRevD.100.072002

ISSN: 2470-0010

WoS: 000489251000002

Scopus: 2-s2.0-85074338081
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URI
http://vinar.vin.bg.ac.rs/handle/123456789/8636
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