Direct CP violation in B decays in R-parity violating models

TL;DR

This paper explores how R-parity violating supersymmetric models can significantly enhance CP asymmetries in B meson decays, potentially reaching 100%, which can be tested in future experiments.

Contribution

It demonstrates that lepton-number-violating couplings in supersymmetry can dramatically increase CP asymmetries in B decays beyond standard model predictions.

Findings

Standard model predicts ~2% asymmetry.

Rescattering effects could raise it to 20-25%.

R-parity violating couplings can enhance it to 100%.

Abstract

In the standard model, CP asymmetries in the $B^\pm \to \pi^\pm K$ channels are about 2% based on perturbative calculation. Rescattering effects might enhance it to at most (20-25)%. We show that lepton-number-violating $\lambda'$ couplings in supersymmetric models are capable of enhancing it to as large as 100%. Upcoming B factories will test this scenario.