Measurements of tt‾ charge asymmetry using dilepton final states in pp collisions at √s=8 TeV

CMS Collaboration

Research output: Contribution to journalArticleResearchpeer-review

18 Citations (Scopus)

Abstract

The charge asymmetry in tt‾ 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 tt‾ and leptonic inclusive charge asymmetries are found to be 0.011 ±0.011(stat) ±0.007 (syst) and 0.003 ±0.006 (stat)±0.003 (syst), respectively. These results, as well as charge asymmetry measurements made as a function of the invariant mass, rapidity, and transverse momentum of the ttsystem, are in agreement with predictions of the standard model.
Original languageEnglish
Pages (from-to)365-386
Number of pages22
JournalPhysics Letters B
Volume760
DOIs
Publication statusPublished - 2016
Externally publishedYes

Keywords

  • CMS
  • Physics
  • Top
  • Charge asymmetry

Cite this