Measurement of the forward-backward asymmetry in the distribution of leptons in ttxAF events in the lepton +jets channel
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 9.7 fb-1 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.
- Publication:
-
Physical Review D
- Pub Date:
- October 2014
- DOI:
- 10.1103/PhysRevD.90.072001
- arXiv:
- arXiv:1403.1294
- Bibcode:
- 2014PhRvD..90g2001A
- Keywords:
-
- 14.65.Ha;
- 12.38.Qk;
- 11.30.Er;
- 13.85.-t;
- Top quarks;
- Experimental tests;
- Charge conjugation parity time reversal and other discrete symmetries;
- Hadron-induced high- and super-high-energy interactions;
- High Energy Physics - Experiment
- E-Print:
- submitted to Phys. Rev. D