Forward-backward asymmetry in top quark-antiquark production

Authors

• V. M. Abazov, Joint Institute for Nuclear Research, Dubna, Russia
• Kenneth A. Bloom, University of Nebraska-LincolnFollow
• Daniel R. Claes, University of Nebraska-LincolnFollow
• Kayle DeVaughan, University of Nebraska-Lincoln
• Aaron Dominguez, University of Nebraska-LincolnFollow
• Michael Eads, University of Nebraska-LincolnFollow
• D. Johnston, University of Nebraska-LincolnFollow
• Ioannis Katsanos, University of Nebraska-LincolnFollow
• Sudhir Malik, University of Nebraska-LincolnFollow
• Gregory Snow, University of Nebraska-LincolnFollow
• D0 Collaboration

Document Type

Article

Date of this Version

2011

Citation

PHYSICAL REVIEW D 84, 112005 (2011); DOI: 10.1103/PhysRevD.84.112005

Comments

Copyright 2011 American Physical Society

Abstract

We present a measurement of forward-backward asymmetry in top quark-antiquark production in proton-antiproton collisions in the final state containing a lepton and at least four jets. Using a data set corresponding to an integrated luminosity of 5.4 fb^-1, collected by the D0 experiment at the Fermilab Tevatron Collider, we measure the tt̅ forward-backward asymmetry to be (9.2 ± 3.7)% at the reconstruction level. When corrected for detector acceptance and resolution, the asymmetry is found to be (19.6 ± 6.5)%. We also measure a corrected asymmetry based on the lepton from a top quark decay, found to be (15.2± 4.0)%. The results are compared to predictions based on the next-to-leading-order QCD generator MC@NLO. The sensitivity of the measured and predicted asymmetries to the modeling of gluon radiation is discussed.