期刊
PHYSICAL REVIEW D
卷 81, 期 11, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.81.114004
关键词
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资金
- Argonne National Laboratory and University of Chicago Joint Theory Institute (JTI) [03921-07-137]
- U.S. Department of Energy [DE-AC02-06CH11357, DE-FG02-90ER40560, DE-FG02-91ER40684]
We adopt a Markov chain Monte Carlo method to examine various new physics models which can generate the forward-backward asymmetry in top quark pair production observed at the Tevatron by the CDF Collaboration. We study the following new physics models: (1) exotic gluon G', (2) extra Z' boson with flavor-conserving interaction, (3) extra Z' with flavor-violating u-t-Z' interaction, (4) extra W' with flavor-violating d-t-W' interaction, and (5) extra scalars S and S-+/- with flavor-violating u-t-S and d-t-S-+/- interactions. After combining the forward-backward asymmetry with the measurement of the top pair production cross section and the t (t) over bar invariant mass distribution at the Tevatron, we find that an axial vector exotic gluon G' of mass about 1 TeV or 2 TeV or a W' of mass about 2TeV offer an improvement over the standard model. The other models considered do not fit the data significantly better than the standard model. We also emphasize a few points that have been long ignored in the literature for new physics searches: (1) heavy resonance width effects, (2) renormalization scale dependence, and (3) next-to-leading order corrections to the t (t) over bar invariant mass spectrum. We argue that these three effects are crucial to test or exclude new physics effects in the top quark pair asymmetry.
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