Home Page of SusyBSG

A program for the NLO calculation of BR[B → Xs γ] in the MSSM with Minimal Flavor Violation

Code written by : Giuseppe Degrassi (Università di Roma Tre), Paolo Gambino (Università di Torino) and Pietro Slavich (LPTHE Paris).
Latest version : v 1.7, latest modifications on 10/05/2017.
arXiv:0712.3265 : is the reference to be used for the program [published in Comput. Phys. Commun. 179 (2008) 759-771]. See below for the up-to-date user manual!
hep-ph/0601135 : provides details on the two-loop calculation of the SUSY contributions [published in Phys. Lett. B 635 (2006) 335-342].

The Fortran code SusyBSG calculates the branching ratio for the decay B → Xs 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, as well as an improved NLO determination of the relation between the
Wilson coefficients and the B → Xs γ branching ratio.

Here we provide the source code and manual, updated information on changes, bugs, etc.

Information on SusyBSG:

  • The up-to-date user manual (latest version: 10/05/2017) can be found here.
  • Short explanations on how to compile and run the code are given in this file.
  • Modifications and corrected bugs are detailed in this file.

    Download the latest version SusyBSG v 1.7 :

  • SusyBSG_1.7.tar.gz : source codes for all the routines in a compressed .tar archive.

    What's new:

  • 10/05/2017 - v 1.7 - Default SM inputs updated in accordance with the analysis of Alberti, Gambino, Healey and Nandi, 1411.6560
  • 01/10/2013 - v 1.6 - Default SM inputs updated in accordance with the analysis of Gambino and Schwanda, 1307.4551
  • 05/12/2011 - v 1.5 - contributions of the "primed" coefficients C'7,8 included for options imod = 4, 5. Default SM inputs and SLHA files updated
  • 09/02/2010 - v 1.4 - new options imod = 11, 12 and 13 added, corresponding to the THDMs of types I, III and C, respectively (see 1002.1071)
  • 12/08/2009 - v 1.3.1 - errors corrected in the flavor-mixing counterterms and in the neutral-Higgs contribution to C8
  • 11/03/2009 - v 1.3 - a new SLHA2 file (produced with SoftSusy) included as sample input
  • 06/11/2008 - v 1.2 - new option imod=5 added. Default SM inputs updated to reproduce the results of Gambino and Giordano, 0805.0271
  • 14/08/2008 - v 1.1.3 - bug corrected in the routine that reads the SLHA2 input file (could cause the code to crash)
  • 22/05/2008 - v 1.1.2 - Makefile added. Harmless bug corrected in the routine that reads the SLHA input file
  • 05/03/2008 - v 1.1.1 - bug corrected in the computation of the squark mass matrices in the presence of flavor mixing
  • 18/02/2008 - v 1.1 - the code can now read also the SM input parameters (in addition to the SUSY parameters) from a SLHA spectrum file
  • 12/02/2008 - v 1.0.3 - two more bugs corrected in the result of the effective theory approximation (thanks to Lars Hofer for spotting one of them)
  • 25/01/2008 - v 1.0.2 - bug corrected in the result of the effective theory approximation (thanks to Roberto Ruiz)
  • 23/01/2008 - v 1.0.1 - new routine for the diagonalization of the 6x6 squark mass matrices (courtesy of Thomas Hahn)
  • 19/12/2007 - v 1.0 - SusyBSG is released

    Earlier versions: to download earlier versions of SusyBSG (but why would you?) please go to the archive.

    For additional information, comments, praise, complaints or suggestions please write to
    the authors: Giuseppe Degrassi, Paolo Gambino, Pietro Slavich.


    Last Modified: 10/05/2017 by PS