Abstract
We discuss semileptonic and leptonic B decays, B → D (∗) τν and B → τν, in the chiral U(1)′ models which were proposed by the present authors in the context of the top forward-backward asymmetry \( \left( {A_{\mathrm{FB}}^t} \right) \) observed at the Tevatron. In these models, extra Higgs doublets with nonzero U(1)′ charges are required in order to make the realistic mass matrix for up-type quarks. Then the extra (pseudo)scalars contribute to \( A_{\mathrm{FB}}^t \) with large flavor-changing Yukawa couplings involving top quark. The contribution of the charged Higgs to \( A_{\mathrm{FB}}^t \) is negligible, but it may significantly affect B decays: especially, B → D (*) τν and B → τν. We investigate constraints on the B decays, based on the recent results in BaBar and Belle experiments, and discuss the possibility that the allowed parameter region in the B decays can achieve large \( A_{\mathrm{FB}}^t \).
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ArXiv ePrint: 1212.4607
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Ko, P., Omura, Y. & Yu, C. B → D (*) τν and B → τν in chiral U(1)′ models with flavored multi Higgs doublets. J. High Energ. Phys. 2013, 151 (2013). https://doi.org/10.1007/JHEP03(2013)151
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DOI: https://doi.org/10.1007/JHEP03(2013)151