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

CMS Collaboration

Research output: Contribution to journalArticle

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 constrain 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.

Original languageEnglish
Article number072002
JournalPhysical Review D
Volume100
Issue number7
DOIs
Publication statusPublished - 8 Oct 2019

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quarks
collisions
protons
polarization
quantum chromodynamics
cross sections
coefficients
partons
center of mass
leptons
confidence
dipole moments
luminosity
predictions
simulation
energy

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

Cite this

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

In: Physical Review D, Vol. 100, No. 7, 072002, 08.10.2019.

Research output: Contribution to journalArticle

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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 constrain 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.",
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