A bstract 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} ight) $ 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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机译：一个Bstract我们讨论半透明和Leptonic B衰减，B→D _（（？））τ和B→τν，在上面的上下文中的本作者提出的手表U（1）_（'）模型中向后向后不对称$ left（{a _ mathrm {fb}} ^ t}右）在tevatron处观察到。在这些模型中，需要具有非零U（1）_（'）费用的额外的HIGGS双重，以便使UP型夸克的逼真质量矩阵。然后，额外的（伪）标量为$ a _ { mathrm {fb}} ^ t $ ove涉及顶部夸克的大型风味变化的yukawa联轴器。收费的HIGGS对$ a _ { mathrm {fb}} ^ t $的贡献可以忽略不计，但它可能会显着影响b衰减：尤其是b→d _（（*））τν和b→τν。我们根据迄今为止禁止的禁止和贝尔实验的结果调查B衰减的约束，并讨论B衰减中允许的参数区域的可能性可以实现大量的$ a _ { mathrm {fb}} ^ t $。
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