CP Violation in rare semileptonic B decays and supersymmetry

TL;DR

This paper investigates how new supersymmetric flavor-changing phases influence CP violation in rare semileptonic B decays, considering various SUSY contributions and experimental constraints to identify potential observable effects.

Contribution

It introduces a detailed analysis of SUSY-induced CP violation in B decays using the mass insertion approximation, including non-perturbative effects and correlations with decay asymmetries.

Findings

SUSY phases can significantly affect CP asymmetries in B decays.

Correlations between asymmetries and branching ratios can reveal SUSY effects.

Different mass insertion scenarios lead to distinct CP violation signatures.

Abstract

We study the effect of new flavor changing SUSY phases arising in the squark mass matrix in semileptonic decays B->Xs ll and B->K(*) ll (l=e,mu). SUSY effects are parametrized using the mass insertion approximation formalism. Constraints on SUSY contributions coming from other processes (e.g. b->s gamma, B->K* ll) are taken into account. Chargino and gluino contributions to photon and Z-mediated decays are included and non-perturbative corrections are considered. We study the correlation between the CP (and forward--backward) asymmetries and the expected value of the inclusive branching ratio. Several possible scenarios are distinguished and discussed according to the mass insertion that is considered.