Tauonic B decays in the Minimal Supersymmetric Standard Model
Tauonic B decays in the Minimal Supersymmetric Standard Model
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DOI：
10.1143/ptp.114.179
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发表时间：
2004-09
影响因子：
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通讯作者：
H. Itoh;Shinji Komine;Y. Okada
中科院分区：
文献类型：
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作者：
H. Itoh;Shinji Komine;Y. Okada
我们研究了包括最终T粒子B→τν和B→TV在内的B衰变过程的新物理效应。这些过程的一个重要特征是，带电希格斯玻色子可以在树级模型中对衰变振幅做出贡献，例如双希格斯双重态模型和最小超对称标准模型（MSSM）。我们推导了具有最小风味违背的MSSM中带电-希格斯介导相互作用的恢复有效拉格朗日量。考虑下型夸克和电荷-轻子汤川耦合的超对称（SUSY）环修正，我们计算了B→DTV和B→TV过程的分支比。我们发现，由胶子-底子图引起的超对称性修正可以使希格斯交换贡献改变±50%，而中性子图可以使希格斯交换贡献改变高达20%。我们还讨论了道子衰变中的SUSY修正与E s→μ + μ -和b→sγ等变味中性电流过程之间的关系。
We study new physics effects on B decay processes including a final T particle, namely B → Dτν and B → TV. An important feature of these processes is that a charged Higgs boson can contribute to the decay amplitude at the tree level in models such as Two Higgs Doublet Model and the Minimal Supersymmetric Standard Model (MSSM). We derive a resummed effective Lagrangian for charged-Higgs mediated interactions in the MSSM with the Minimal Flavor Violation. Including supersymmetric (SUSY) loop corrections for down-type-quark and charged-lepton Yukawa couplings, we calculate the branching ratios of the B → DTV and B → TV processes. We find that SUSY correction due to gluino-sbottom diagrams can change the Higgs exchange contribution by ±50%, whereas stau-neutralino diagrams can make corrections up to 20%. We also discuss relationship between SUSY corrections in the tauonic decays and flavor changing neutral current processes such as E s → μ + μ - and b → sγ.