Measurement of the top quark forward-backward production asymmetry and its dependence on event kinematic properties
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Aaltonen-2013-Measurement of the top quark forward-backward production.pdf
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Author(s)
Gomez-Ceballos, Guillelmo
Goncharov, Maxim
Paus, Christoph M. E.
Date Issued
May 2013
Journal
Physical Review D
Publisher
American Physical Society
Citation
Aaltonen, T., S. Amerio, D. Amidei, A. Anastassov, A. Annovi, J. Antos, G. Apollinari, et al. “Measurement of the top quark forward-backward production asymmetry and its dependence on event kinematic properties.” Physical Review D 87, no. 9 (May 2013). © 2013 American Physical Society
Version
Final published version
Abstract
We present new measurements of the inclusive forward-backward tt̅ production asymmetry, A[subscript FB], and its dependence on several properties of the tt̅ system. The measurements are performed with the full Tevatron data set recorded with the CDF II detector during pp̅ collisions at √s=1.96 TeV, corresponding to an integrated luminosity of 9.4 fb[superscript -1]. We measure the asymmetry using the rapidity difference Δy=y[subscript t]-y[subscript t̅]. Parton-level results are derived, yielding an inclusive asymmetry of 0.164±0.047(stat+syst). We establish an approximately linear dependence of A[subscript FB] on the top-quark pair mass M[subscript tt̅] and the rapidity difference |Δy| at detector and parton levels. Assuming the standard model, the probabilities to observe the measured values or larger for the detector-level dependencies are 7.4×10[superscript -3] and 2.2×10[superscript -3] for M[subscript tt̅] and |Δy| respectively. Lastly, we study the dependence of the asymmetry on the transverse momentum of the tt̅ system at the detector level. These results are consistent with previous lower-precision measurements and provide additional quantification of the functional dependencies of the asymmetry.
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.87.092002
