Bottom-Quark Forward-Backward Asymmetry in the Standard Model and Beyond

作者：Grinstein Benjamin^*; Murphy Christopher W

来源：Physical Review Letters, 2013, 111(6): 062003.

DOI：10.1103/PhysRevLett.111.062003

We computed the bottom-quark forward-backward asymmetry at the Tevatron in the standard model (SM) and for several new physics scenarios. Near the Z pole, the SM bottom asymmetry is dominated by tree level exchanges of electroweak gauge bosons. While above the Z pole, next-to-leading order QCD dominates the SM asymmetry as was the case with the top-quark forward-backward asymmetry. Light new physics, M-NP less than or similar to 150 GeV, can cause significant deviations from the SM prediction for the bottom asymmetry. The bottom asymmetry can be used to distinguish between competing new physics (NP) explanations of the top asymmetry based on how the NP interferes with s-channel gluon and Z exchange.

• 出版日期2013-8-6