CP asymmetry for radiative B-meson decay in the supersymmetric standard model

TL;DR

This paper investigates CP asymmetry in radiative B-meson decay within a supersymmetric standard model, predicting a potentially large asymmetry detectable at B factories, constrained by experimental data.

Contribution

It introduces a supersymmetric model with complex scalar-trilinear couplings as a source of CP violation, predicting larger asymmetries than the standard model.

Findings

Decay rate asymmetry can reach up to 0.1

Predicted asymmetry is significantly larger than in the standard model

Results are consistent with experimental constraints

Abstract

We study a rate asymmetry in the inclusive decay $\Bsgamma$, assuming the supersymmetric standard model based on N=1 supergravity. A complex coefficient $A$ for scalar-trilinear couplings is the source of CP violation, which is contained in the mass-squared matrices for squarks. The model parameters are nontrivially constrained by experimental results for the branching ratio of the radiative decay and for the electric dipole moments of the neutron and the electron. The decay rate asymmetry is predicted to be much larger than that by the standard model in a wide region of the parameter space compatible with the experiments. Its magnitude can be maximally around 0.1, which will be well accessible at B factories.