Effects of R-parity violation on direct CP violation in B decays and extraction of $\gamma$

Abstract

In the standard model, direct CP-violating asymmetries for $B^{\pm }\to {\pi }^{\pm }K$ are roughly 2% based on perturbative calculation. Rescattering effects might enhance it to at most (20-25)%. We show that lepton-number-violating couplings in supersymmetric models without R-parity are capable of inducing as large as 100% CP asymmetry in this channel. Such effects drastically modify the allowed range of the CKM parameter $\gamma$ arising from the combinations of the observed charged and neutral B decays in the $\pi K$ modes. With a multichannel analysis in B decays, one can either discover this exciting new physics, or significantly improve the existing constraints on it.

Comments: Latex, 5 pages; minor changes, to appear in Phys Rev Lett