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

TL;DR

This paper investigates how R-parity violating supersymmetry affects leptonic decays of D_s and B^+ mesons, exploring constraints on RPV couplings and potential lepton flavor violation signals.

Contribution

It provides a detailed analysis of RPV contributions to meson decays and identifies parameter regions allowing sizable RPV couplings with possible destructive interference effects.

Findings

RPV interactions can significantly alter leptonic decay rates.

Certain parameter regions permit sizable RPV couplings due to destructive interference.

Constraints from other LFV processes limit RPV coupling strengths.

Abstract

We study leptonic decays D_s\to \tau \nu and B^+ \to \tau \nu 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), \tau\nu_\mu (\tau \nu_e), are also examined taking account of constraints on the RPV couplings from the other LFV processes.