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首页> 外文期刊>Physical review, D >Charged Higgs boson contribution to Bq?→?νˉ and Bˉ→(P,V)?νˉ in a generic two-Higgs doublet model
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Charged Higgs boson contribution to Bq?→?νˉ and Bˉ→(P,V)?νˉ in a generic two-Higgs doublet model

机译：在普通的两希格斯二重态模型中，带电的希格斯玻色子对Bq？→？νˉ和Bˉ→（P，V）？νˉ的贡献

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We comprehensively study the charged Higgs boson contributions to the leptonic B q ? → ? ν ˉ ( q = u , c ) and semileptonic B ˉ → X q ? ν ˉ ( X u = π , ρ ; X c = D , D * ) decays in the type-III two-Higgs doublet model. We employ the Cheng-Sher ansatz to suppress the tree-level flavor-changing neutral currents in the quark sector. When the strict constraints from the Δ B = 2 , b → s γ , and p p ( b b ˉ ) → H / A → τ + τ ? processes are considered, parameters χ t q u from the quark couplings and χ ? ? from the lepton couplings dictate the leptonic and semileptonic B decays. It is found that, when the measured B u ? → τ ν ˉ and indirect bound of B c ? → τ ν ˉ obtained by LEP1 data are taken into account, R ( D ) and R ( π ) can have broadly allowed ranges; however, the values of R ( ρ ) and R ( D * ) are limited to approximately the standard model (SM) results. We also find that the same behaviors also occur in the τ -lepton polarizations and forward-backward asymmetries ( A F B X q , τ ) of the semileptonic decays, with the exception of A F B D * , τ , for which the deviation from the SM due to the charged Higgs boson effect is still sizable. In addition, the q 2 -dependent A F B π , τ and A F B D , τ can be very sensitive to the charged Higgs boson effects and have completely different shapes from the SM.
机译：我们全面研究了带电的希格斯玻色子对轻子B q的贡献。 →？ νˉ（q = u，c）和半瘦Bˉ→X q？ νtwo（X u =π，ρ; X c = D，D *）在III型两希格斯二重态模型中衰减。我们使用Cheng-Sher ansatz来抑制夸克扇区中树级别的变味中性电流。当来自ΔB = 2的严格约束时，b→sγ，并且p p（b bˉ）→H / A→τ+τ？考虑过程，夸克偶合的参数χt q u和χ？ ？轻子的耦合决定了轻子和半轻子的B衰变。发现，当测得的B u≥ →τνˉ与B c的间接界？ →将LEP1数据获得的τνinto考虑在内，R（D）和R（π）可以具有较宽的允许范围;但是，R（ρ）和R（D *）的值仅限于标准模型（SM）结果。我们还发现，除了AFBD *，τ之外，半轻子衰变的τ轻子极化和前向后不对称性（AFBX q，τ）也会发生相同的行为，这是由于AFBD *，τ导致的。带电的希格斯玻色子效应仍然相当大。此外，q 2依赖的A F Bπ，τ和A F B D，τ对带电的希格斯玻色子效应非常敏感，并且具有与SM完全不同的形状。

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