Measurement of the forward-backward asymmetry in the distribution of leptons in tt¯ events in the lepton+jets channel

V. M. Abazov et al. (D0 Collaboration)
Phys. Rev. D 90, 072001 – Published 7 October 2014

Abstract

We present measurements of the forward-backward asymmetry in the angular distribution of leptons from decays of top quarks and antiquarks produced in proton-antiproton collisions. We consider the final state containing a lepton and at least three jets. The entire sample of data collected by the D0 experiment during Run II of the Fermilab Tevatron Collider, corresponding to 9.7fb1 of integrated luminosity, is used. The asymmetry measured for reconstructed leptons is AFBl=(2.9±2.1(stat.)1.7+1.5(syst.))%. When corrected for efficiency and resolution effects within the lepton rapidity coverage of |yl|<1.5, the asymmetry is found to be AFBl=(4.2±2.3(stat.)2.0+1.7(syst.))%. We examine the dependence of AFBl on the transverse momentum and rapidity of the lepton. Combination with the asymmetry measured in the final states containing two leptons yields AFBl=(4.2±2.0(stat.)±1.4(syst.))%. The results are in agreement with predictions from the next-to-leading-order QCD generator mc@nlo, which predicts an asymmetry of AFBl=2.0% for |yl|<1.5.

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  • Received 7 March 2014

DOI:https://doi.org/10.1103/PhysRevD.90.072001

© 2014 American Physical Society

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Vol. 90, Iss. 7 — 1 October 2014

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