Measurement of the top quark polarization and t t ¯ spin correlations using dilepton final states in proton-proton collisions at √ s = 13 TeV
Name
PhysRevD.100.072002.pdf
Description
Published version
Size
1.76 MB
Format
Adobe PDF
Checksum (MD5)
6b785f62f7f9c075eaa2dcbb9a7e682e
Author(s)
The CMS Collaboration
Date Issued
2019
Journal
Physical Review D
Publisher
American Physical Society (APS)
Version
Final published version
Abstract
© 2019 CERN. 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
MIT Department
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Laboratory for Nuclear Science
Terms of Use
Creative Commons Attribution 4.0 International license
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1103/PHYSREVD.100.072002
