$\bar{B}\rightarrow X_s\gamma$ in the $\mu\nu$SSM

TL;DR

This paper studies the rare decay $ar{B} ightarrow X_s ext{gamma}$ within the $ u$SSM, showing that new physics contributions can align with experimental data and constrain model parameters.

Contribution

It provides the first detailed analysis of $ar{B} ightarrow X_s ext{gamma}$ decay in the $ u$SSM under minimal flavor violation, linking Higgs mass constraints to flavor physics.

Findings

New physics in $ u$SSM can fit $ar{B} ightarrow X_s ext{gamma}$ data.

Parameter space is constrained by Higgs mass and decay data.

The model remains viable within current experimental bounds.

Abstract

The $\mu\nu$SSM, one of supersymmetric extensions beyond the Standard Model, introduces three singlet right-handed neutrino superfields to solve the $\mu$ problem and can generate three tiny Majorana neutrino masses through the seesaw mechanism. In this work, we investigate the rare decay process $\bar{B}\rightarrow X_s\gamma$ in the $\mu\nu$SSM, under a minimal flavor violating assumption for the soft breaking terms. Constrained by the SM-like Higgs with mass around 125 GeV, the numerical results show that the new physics can fit the experimental data for $\bar{B}\rightarrow X_s\gamma$ and further constrain the parameter space.