SusyBSG: a Fortran code for [formula omitted] in the MSSM with Minimal Flavor Violation

Abstract

We present the Fortran code SusyBSG version 1.1, which computes the branching ratio for the decay B → X s γ in the MSSM with Minimal Flavor Violation. The computation takes into account all the available NLO contributions, including the complete supersymmetric QCD corrections to the Wilson coefficients of the magnetic and chromomagnetic operators. Program summary Program title: SusyBSG Catalogue identifier: AEBM_v1_0 Program summary URL: http://cpc.cs.qub.ac.uk/summaries/AEBM_v1_0.html Program obtainable from: CPC Program Library, Queen's University, Belfast, N. Ireland Licensing provisions: Standard CPC licence, http://cpc.cs.qub.ac.uk/licence/licence.html No. of lines in distributed program, including test data, etc.: 99 155 No. of bytes in distributed program, including test data, etc.: 708 850 Distribution format: tar.gz Programming language: Fortran Computer: All computers with a Fortran compiler Operating system: Linux Classification: 11.6 Nature of problem: Predicting the branching ratio for the decay B → X S γ in the MSSM with Minimal Flavor Violation. Solution method: We take into account all the available NLO contributions, including the two-loop gluino contributions to the Wilson coefficients computed in Ref. [1]. The relation between the Wilson coefficients and the branching ratio for B → X S γ is computed along the lines of Ref. [2]. The SUSY input parameters can be read from a spectrum file in the SLHA format. Restrictions: The results apply only to the case of Minimal Flavor Violation. Unusual features: Numerical instabilities may arise for special combinations of the input parameters. They can usually be avoided by compiling the code in quadruple precision. Running time: Approximately 10 ms in double precision, 0.5 s in quadruple precision (on a Pentium D 3.40-GHz).