CP Asymmetries in Radiative B Decays with R-parity Violation

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Abstract
We analyze the effect of R-parity violation in the minimal supersymmetric standard model on the CP asymmetries in the b \to s \gamma decay. The direct and mixing-induced CP asymmetries arising from the lepton number violating couplings are strongly constrained by the current experimental limits on the corresponding couplings. Allowing a heavy neutrino (m_{\nu_\tau}\sim 10 keV) and a moderate mass splitting of sfermions, the direct CP asymmetry around 15 % and the nearly maximal mixing-induced CP asymmetry (\sim 100 %) can be realized, depending on the R-parity conserving contributions to the radiative b decay. With the baryon number violating couplings, only the mixing-induced CP asymmetry arises and it can be maximal provided the similar sfermion mass splitting.

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