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

TL;DR

This paper explores how R-parity-violating supersymmetric interactions can cause large direct CP violation in B meson decays, significantly affecting the extraction of the CKM angle gamma and offering a potential window into new physics.

Contribution

It demonstrates that lepton-number-violating couplings in R-parity-violating supersymmetry can induce up to 100% CP asymmetry in B decays, altering the interpretation of experimental data.

Findings

R-parity violation can produce large CP asymmetries in B decays.

Such effects can significantly modify the allowed range of the CKM gamma parameter.

Multichannel analysis can help discover or constrain new physics effects.

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.