Tauonic B decays in the Minimal Supersymmetric Standard Model

Details Tauonic B decays in the Minimal Supersymmetric Standard Model Tauonic B decays in the Minimal Supersymmetric Standard Model

2004-09-20

arxiv.org/abs/hep-ph/0409228v3

Prog.Theor.Phys. 114 (2005) 179-204

Physics

High Energy Physics

High Energy Physics - Phenomenology

29 pages, 22 figures

Scientific paper

10.1143/PTP.114.179

We study new physics effects on B decay processes including a final $\tau$ particle, namely $B \to D \tau \nu$ and $B \to \tau \nu$. 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 $B \to D \tau \nu$ and $B \to \tau \nu$ processes. We find that SUSY correction due to gluino-sbottom diagrams can change the Higgs exchange contribution by $\pm50$%, 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 $B_s \to \mu^+\mu^-$ and $b \to s \gamma$.

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