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Forward-Backward Asymmetry in Top Quark-Antiquark Production
Stockholm University, Faculty of Science, Department of Physics. (Elementarpartikelfysik)
2011 (English)In: Physical Review D. Particles and fields, ISSN 0556-2821, E-ISSN 1089-4918, Vol. 84, no 11, 112005- p.Article in journal (Refereed) Published
Abstract [en]

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 t (t) over bar 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.

Place, publisher, year, edition, pages
2011. Vol. 84, no 11, 112005- p.
National Category
Subatomic Physics
Research subject
URN: urn:nbn:se:su:diva-65790DOI: 10.1103/PhysRevD.84.112005ISI: 000297937500001OAI: diva2:464715
Swedish Research Council
Publikationen har totalt 421 författare, V. Abazov et al.Available from: 2011-12-13 Created: 2011-12-13 Last updated: 2012-01-29Bibliographically approved

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