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Measurements of t t-bar spin correlations and top quark polarization using dilepton final states in pp collisions at sqrt(s) = 8 TeV

Measurements of t t-bar spin correlations and top quark polarization using dilepton final states in pp collisions at sqrt(s) = 8 TeV
Measurements of t t-bar spin correlations and top quark polarization using dilepton final states in pp collisions at sqrt(s) = 8 TeV
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.
2470-0010
052007
Khachatryan, V.
3ea104df-0bcf-40fc-a764-2311921cf360
Belyaev, Alexander
6bdb9638-5ff9-4b65-a8f2-34bae3ac34b3
The CMS Collaboration
Khachatryan, V.
3ea104df-0bcf-40fc-a764-2311921cf360
Belyaev, Alexander
6bdb9638-5ff9-4b65-a8f2-34bae3ac34b3

The CMS Collaboration (2016) Measurements of t t-bar spin correlations and top quark polarization using dilepton final states in pp collisions at sqrt(s) = 8 TeV. Physical Review D, D93 (5), 052007. (doi:10.1103/PhysRevD.93.052007).

Record type: Article

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.

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More information

Published date: 9 March 2016
Organisations: Physics & Astronomy

Identifiers

Local EPrints ID: 408351
URI: http://eprints.soton.ac.uk/id/eprint/408351
ISSN: 2470-0010
PURE UUID: 58e44889-c75a-4fc8-a746-158af0bf82f2
ORCID for Alexander Belyaev: ORCID iD orcid.org/0000-0002-1733-4408

Catalogue record

Date deposited: 19 May 2017 04:04
Last modified: 17 Dec 2019 01:44

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Contributors

Author: V. Khachatryan
Corporate Author: The CMS Collaboration

University divisions

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