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Measurement of the top quark forward-backward production asymmetry and its dependence on event kinematic properties

Aaltonen, T.
•
Amerio, S.
•
Amidei, D.
altro
Zucchelli, S
2013
  • journal article

Periodico
PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY
Abstract
We present new measurements of the inclusive forward-backward tt ̄ production asymmetry, AFB, and its dependence on several properties of the tt ̄ system. The measurements are performed with the full Tevatron data set recorded with the CDF II detector during pp ̄ collisions at √s=1.96 TeV, corresponding to an integrated luminosity of 9.4 fb−1. We measure the asymmetry using the rapidity difference Δy=yt−yt ̄. Parton-level results are derived, yielding an inclusive asymmetry of 0.164±0.047(stat+syst). We establish an approximately linear dependence of AFB on the top-quark pair mass Mtt ̄ 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 7.4×10−3 and 2.2×10−3 for Mtt ̄ and |Δy| respectively. Lastly, we study the dependence of the asymmetry on the transverse momentum of the tt ̄ 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.
DOI
10.1103/PhysRevD.87.092002
WOS
WOS:000318999600002
Archivio
http://hdl.handle.net/11390/983146
info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-84878003188
Diritti
closed access
Web of Science© citazioni
48
Data di acquisizione
Mar 21, 2024
Visualizzazioni
1
Data di acquisizione
Apr 19, 2024
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