Full 1-loop calculation of BR$(B_{s,d}^0\to \ell \bar \ell)$ in models beyond the MSSM with SARAH and SPheno

TL;DR

This paper introduces a comprehensive one-loop calculation method for rare B meson decays within various supersymmetric models, implemented in SARAH and SPheno, enabling precise numerical predictions beyond the MSSM.

Contribution

The authors developed a generic one-loop calculation framework for B meson decays in supersymmetric models, integrated into SARAH and SPheno, allowing broad applicability including non-supersymmetric theories.

Findings

Implemented in SARAH for generic models

Generated Fortran code for SPheno for numerical analysis

Applicable to non-supersymmetric models as well

Abstract

We present the possibility of calculating the quark flavor changing neutral current decays $B_{s}^0\to \ell \bar \ell$ and $B_{d}^0\to \ell \bar \ell$ for a large variety of supersymmetric models. For this purpose, the complete one-loop calculation has been implemented in a generic form in the Mathematica package SARAH. This information is used by SARAH to generate Fortran source code for SPheno for a numerical evaluation of these processes in a given model. We comment also on the possibility to use this setup for non-supersymmetric models.