Evidence for a mass dependent forward-backward asymmetry in top quark pair production
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Aaltonen-2011-Evidence for a mass.pdf
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Author(s)
Gomez-Ceballos, Guillelmo
Goncharov, Maxim
Paus, Christoph M. E.
Bauer, Gerry P
Makhoul, Khaldoun
Date Issued
June 2011
Journal
Physical Review D
Publisher
American Physical Society
Citation
Aaltonen, T. et al. “Evidence for a Mass Dependent Forward-backward Asymmetry in Top Quark Pair Production.” Physical Review D 83.11 (2011) : 112003. © 2011 American Physical Society.
Version
Final published version
Abstract
We present a new measurement of the inclusive forward-backward tt[over-bar] production asymmetry and its rapidity and mass dependence. The measurements are performed with data corresponding to an integrated luminosity of 5.3 fb-1 of pp[over-bar ]collisions at [sqrt]s=1.96 TeV, recorded with the CDF-II Detector at the Fermilab Tevatron. Significant inclusive asymmetries are observed in both the laboratory frame and the tt[over-bar] rest frame, and in both cases are found to be consistent with CP conservation under interchange of t and t[over-bar] . In the tt[over-bar] rest frame, the asymmetry is observed to increase with the tt[over-bar] rapidity difference, delta y, and with the invariant mass Mtt[over-bar] of the tt[over-bar] system. Fully corrected parton-level asymmetries are derived in two regions of each variable, and the asymmetry is found to be most significant at large delta y and Mtt[over-bar] . For Mtt[over-bar] ≥450 GeV/c2, the parton-level asymmetry in the tt[over-bar] rest frame is Att[over-bar] =0.475±0.114 compared to a next-to-leading order QCD prediction of 0.088±0.013.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Laboratory for Nuclear Science
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DOI of Published Version
https://doi.org/10.1103/PhysRevD.83.112003
