Measurements of tt¯ spin correlations and top quark polarization using dilepton final states in pp collisions at s√=8 TeV
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Measurements of t(t).pdf
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Author(s)
CMS Collaboration
Apyan, Aram
Barbieri, Richard Alexander
Baty, Austin Alan
Bi, Ran
Bierwagen, Katharina
Brandt, Stephanie Akemi
Busza, Wit
Cali, Ivan Amos
Demiragli, Zeynep
Date Issued
March 2016
Journal
Physical Review D
Publisher
American Physical Society
Citation
Khachatryan, V. et al. "Measurements of tt¯ spin correlations and top quark polarization using dilepton final states in pp collisions at s√=8 TeV." Physical Review D 93, 5 (March 2016): 052007 © 2016 CERN for the CMS Collaboration
Version
Final published version
Abstract
Measurements of the top quark-antiquark (t¯t) spin correlations and the top quark polarization are presented for t¯t pairs produced in pp collisions at √s=8 TeV. The data correspond to an integrated luminosity of 19.5 fb⁻¹ collected with the CMS detector at the LHC. The measurements are performed using events with two oppositely charged leptons (electrons or muons) and two or more jets, where at least one of the jets is identified as originating from a bottom quark. The spin correlations and polarization are measured from the angular distributions of the two selected leptons, both inclusively and differentially, with respect to the invariant mass, rapidity, and transverse momentum of the t¯t system. The measurements are unfolded to the parton level and found to be in agreement with predictions of the standard model. A search for new physics in the form of anomalous top quark chromo moments is performed. No evidence of new physics is observed, and exclusion limits on the real part of the chromo-magnetic dipole moment and the imaginary part of the chromo-electric dipole moment are evaluated.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Laboratory for Nuclear Science
Terms of Use
Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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DOI of Published Version
https://doi.org/10.1103/PhysRevD.93.052007
