解释类型为III的2 HDM中的B->Dτν、B->D*τν和B->τν
Explaining B->Dτν, B->D*τνand B->τνin a 2HDM of type III
摘要：
最近，BaBar合作报告了B->Dτν和B->D*τν中新物理的第一个证据。结合两个过程，显著性为3.4σ。这一结果无法用II型的两个希格斯偶线模型来解释。此外，CKMfitter小组发现Br[B->τ v]的标准模型预测（使用来自整体拟合的Vub到酉三角形）与B工厂的测量值之间存在2.9σ的差异。总而言之，这些测量是强有力的物理超越SM在B介子衰变到τ。我们证明了在一个两个Higgs的第III型二重态模型中，用一个自由参数ε^u_32同时解释\bdtau和\bdstau是可能的。Br[B->τν]也可以用ε^u_31与实验相一致。此外，对于500 GeV附近的Higgs（A^0，H^0，H^+）质量，正如最近的CMS结果所表明的那样，FCNC过程的所有界限都得到了满足，并且B->Dτν，B->D*τν和B->τν可以在没有显著程度的微调的情况下得到解释。
英文摘要：
Recently, the BaBar collaboration reported first evidence for new physics in B->Dτνand B->D*τν. Combining both processes the significance is 3.4σ. This result cannot be explained in a two Higgs doublet model of type II. Furthermore, the CKMfitter group finds a 2.9σdiscrepancy between the Standard Model prediction for Br[B->τν] (using Vub from a global fit to the unitary triangle) and the measurements of the B factories. Altogether, these measurements are strong indications for physics beyond the SM in B meson decays to taus. We show that in a two Higgs doublet model of type III it is possible to simultaneously explain \bdtau and \bdstau using a single free parameter ε^u_32. Also Br[B->τν] can be brought into agreement with experiment using ε^u_31. Furthermore, for Higgs (A^0, H^0, H^+) masses around 500 GeV, as suggested by recent CMS results, all bounds from FCNC processes are satisfied and B->Dτν, B->D*τνand B->τνcan be explained without a significant degree of fine-tuning.
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