New constraints on supersymmetric models from b -> s gamma

TL;DR

This paper analyzes how a new observable in b -> s gamma decays constrains various supersymmetric models, providing tighter bounds on their parameter spaces and implications for supersymmetric particle masses.

Contribution

It introduces the isospin symmetry breaking in B -> K* gamma decays as a novel constraint on supersymmetric models, expanding the methods to restrict their parameter spaces.

Findings

Isospin symmetry breaking severely restricts model parameters.

Constraints on supersymmetric particle masses are derived.

Comparison with B_s -> mu+ mu- branching ratio enhances analysis.

Abstract

We provide an analysis of the parameter space of several supersymmetry breaking scenarios such as the minimal supergravity (mSUGRA) model and the non universal Higgs mass (NUHM) framework, as well as the Anomaly Mediated Supersymmetry Breaking (AMSB) and the Gauge Mediated Supersymmetry Breaking (GMSB) models, in the light of a novel observable in b -> s gamma transitions, i.e. the isospin symmetry breaking in the exclusive B -> K* gamma decays. We find that in many cases, this observable provides severe restrictions on the allowed parameter space regions for the mentioned models. Moreover, we provide a few examples of investigations of the physical masses of supersymmetric particles and search for the excluded values. The constraints from the branching ratio associated to b -> s gamma are also presented here for all the examined parameter space regions. A comparison with B_s -> mu+ mu- branching ratio has also been performed.