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Title: Measurements of $$t \bar t$$ charge asymmetry using dilepton final states in pp collisions at $$\sqrt s=8$$ TeV

Abstract

The charge asymmetry in $$t \bar t$$ events is measured using dilepton final states produced in pp collisions at the LHC at √s = 8 TeV. The data sample, collected with the CMS detector, corresponds to an integrated luminosity of 19.5 fb –1. 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 charge asymmetry is measured from differences in kinematic distributions, unfolded to the parton level, of positively and negatively charged top quarks and leptons. The $$t \bar t$$ and leptonic charge asymmetries are found to be 0.011 ± 0.011 (stat) ± 0.007 (syst) and 0.003 ± 0.006 (stat) ± 0.003 (syst), respectively. Lastly, These results, as well as charge asymmetry measurements made as a function of $$t \bar t$$ system kinematic properties, are in agreement with predictions of the standard model.

Authors:
 [1]
  1. Yerevan Physics Inst. (YerPhI), Yerevan (Armenia). et al.
Publication Date:
Research Org.:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
OSTI Identifier:
1263694
Report Number(s):
FERMILAB-PUB-16-099-CMS; CMS-TOP-15-009; CERN-EP-2016-059; arXiv:1603.06221
Journal ID: ISSN 0370-2693; 1430892
Grant/Contract Number:
AC02-07CH11359
Resource Type:
Journal Article: Published Article
Journal Name:
Physics Letters. Section B
Additional Journal Information:
Journal Volume: 760; Journal Issue: C; Journal ID: ISSN 0370-2693
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; CMS; physics; top; charge asymmetry

Citation Formats

Khachatryan, Vardan. Measurements of $t \bar t$ charge asymmetry using dilepton final states in pp collisions at $\sqrt s=8$ TeV. United States: N. p., 2016. Web. doi:10.1016/j.physletb.2016.07.006.
Khachatryan, Vardan. Measurements of $t \bar t$ charge asymmetry using dilepton final states in pp collisions at $\sqrt s=8$ TeV. United States. doi:10.1016/j.physletb.2016.07.006.
Khachatryan, Vardan. 2016. "Measurements of $t \bar t$ charge asymmetry using dilepton final states in pp collisions at $\sqrt s=8$ TeV". United States. doi:10.1016/j.physletb.2016.07.006.
@article{osti_1263694,
title = {Measurements of $t \bar t$ charge asymmetry using dilepton final states in pp collisions at $\sqrt s=8$ TeV},
author = {Khachatryan, Vardan},
abstractNote = {The charge asymmetry in $t \bar t$ events is measured using dilepton final states produced in pp collisions at the LHC at √s = 8 TeV. The data sample, collected with the CMS detector, corresponds to an integrated luminosity of 19.5 fb–1. 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 charge asymmetry is measured from differences in kinematic distributions, unfolded to the parton level, of positively and negatively charged top quarks and leptons. The $t \bar t$ and leptonic charge asymmetries are found to be 0.011 ± 0.011 (stat) ± 0.007 (syst) and 0.003 ± 0.006 (stat) ± 0.003 (syst), respectively. Lastly, These results, as well as charge asymmetry measurements made as a function of $t \bar t$ system kinematic properties, are in agreement with predictions of the standard model.},
doi = {10.1016/j.physletb.2016.07.006},
journal = {Physics Letters. Section B},
number = C,
volume = 760,
place = {United States},
year = 2016,
month = 7
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1016/j.physletb.2016.07.006

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Cited by: 4works
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