Rare B decays and Tevatron top-pair asymmetry

Details Rare B decays and Tevatron top-pair asymmetry Rare B decays and Tevatron top-pair asymmetry

2011-04-08

arxiv.org/abs/1104.1497v3

Physics

High Energy Physics

High Energy Physics - Phenomenology

15 page, 6 figures, typos corrected and references added, final version to appear journal

Scientific paper

The recent Tevatron result on the top quark forward-backward asymmetry, which deviates from its standard model prediction by 3.4$\sigma$, has prompted many authors to build new models to account for this anomaly. Among the various proposals, we find that those mechanisms which produce $t\bar t$ via $t$- or $u$-channel can have a strong correlation to the rare B decays. We demonstrate this link by studying a model with a new charged gauge boson, $W'$. In terms of the current measurements on $B\to \pi K$ decays, we conclude that the branching ratio for $B^-\to \pi^- \bar K^0$ is affected most by the new effects. Furthermore, using the world average branching ratio for the exclusive B decays at $2\sigma$ level, we discuss the allowed values for the new parameters. Finally, we point out that the influence of the new physics effects on the direct CP asymmetry in B decays is insignificant.

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