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

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.

v3: fixed title v2: extended discussion of input parameters and support of FLHA; new appendix about massless limits of loop functions. Matches version accepted for publication by CPC

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• Generalized Soft Breaking Leverage for the MSSM
• General squark flavour mixing: constraints, phenomenology and benchmarks
• Electroweak Phase Transition in a Right-Handed Neutrino Superfield Extended NMSSM
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