CP asymmetries in radiative B decays with R-parity violation -: art. no. 076006

We analyze the effect of R-parity violation in the minimal supersymmetric standard model on the CP asymmetries in b --> 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) similar to 10 keV) and a moderate mass splitting of sfermions, the direct CP asymmetry around 15% and the nearly maximal mixing-induced CP asymmetry (similar to 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 there is a similar sfermion mass splitting.