Constraints on R-parity violating interactions in supersymmetric standard model from leptonic decays of Ds and B+ mesons

We study leptonic decays Ds→τν and B+→τν in R-parity violating (RPV) supersymmetric standard model. The interference between the s-channel slepton exchange and the t-channel squark exchange diagrams could be destructive in a certain model parameter region so that sizable RPV couplings are allowed. Contributions from the RPV interactions to the final states with the lepton flavor violation (LFV), τνμ(τνe), are also examined taking account of constraints on the RPV couplings from the other LFV processes.