Study of the exclusive $b \to u \ell^- \barν_{\ell}$ decays in the MSSM with and without R-parity violation

Details Study of the exclusive $b \to u \ell^- \barν_{\ell}$ decays in the MSSM with and without R-parity violation Study of the exclusive $b \to u \ell^- \barν_{\ell}$ decays in the MSSM with and without R-parity violation

2007-12-18

arxiv.org/abs/0712.2954v1

Phys.Rev.D77:094006,2008

Physics

High Energy Physics

High Energy Physics - Phenomenology

28 pages and 10 figures

Scientific paper

10.1103/PhysRevD.77.094006

We study the exclusive $b \to u \ell^- \bar{\nu}_{\ell} (\ell=\tau,\mu,e)$ decays in the MSSM with and without R-parity violation. From the experimental measurements of branching ratios $\mathcal{B}(B^-_u \to \tau^- \bar{\nu}_{\tau})$, $\mathcal{B}(B^-_u \to M'^0 \ell'^- \bar{\nu}_{\ell'})$ and $\mathcal{B}(\bar{B}^0_d \to M'^+ \ell'^- \bar{\nu}_{\ell'})$ $(\ell'=\mu,e, M'=\pi,\rho)$, we derive new upper bounds on the relevant new physics parameters within the decays. Using the constrained new physics parameter spaces, we predict the charged Higgs effects and the R-parity violating effects on the branching ratios, the normalized forward-backward asymmetries of charged leptons, and the ratios of longitudinal to transverse polarization of the vector mesons, which have not been measured or have not been well measured yet. We find that the charged Higgs effects and the R-parity violating effects could be large and measurable in some cases. Our results could be used to probe new physics effects in the leptonic decays as well as the semileptonic decays, and will correlate with searches for direct supersymmetric signals in future experiments.

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