SOFTSUSY: by Ben Allanach

Summary

This program provides a SUSY spectrum in the MSSM including flavour violation and with or without R-parity consistent with input Standard Model fermion mass/mixings and electroweak/strong coupling data. If you want to know how it works, watch a video of seminar I gave at CERN for ATLAS experimenters on the calculation. Full three-family couplings and two-loop renormalisation group equations are employed, as well as one-loop finite corrections a la Bagger, Matchev, Pierce and Zhang. It can be used in conjunction with other programs for many different particle physics calculations: see a SUSY tools review. See a graph of MSSM RGE evolution at SPS1a (feel free to use it).

SOFTSUSY has been used to generate points in the CMSSM that fit current indirect data: you can obtain such points with their properties at the KISMET page. If you just want SLHA spectra for SPS files, they are here: [ 1a | 1b | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 ]

Release 3.1.5 02/08/10

• Gzipped tarred [source 3.1.5 | RPC manual | RPV manual | documentation]:
  Fixed one-loop tadpoles for RPV calculation - they are now set non-zero and down/lepton Yukawa calculation - RPV contribution was wrong. Thanks to S Kom and M Hanussek. Made SLHA output better for RPV case: zeroes not all output now. Changed sign of mixing terms in gluino mass on advice of K Matchev.
• 14/05/10 [source 3.1.4] Small bug in loop corrections fixed: mA0 and mH0 were sometimes switched. Results in O(10^-4) fractional differences in masses at SPS points. Thanks to Steve Kom.
• 28/04/10 [3.1.3] Bug in alternative electroweak symmetry breaking boundary conditions: two-loop pieces of tadpoles not implemented correctly, results in an inaccurate MA (especially at large tan beta).
• 03/03/10 [3.1.2] Bug in neutralino mass loop corrections fixed involving neutralino-Z couplings. It makes less than (0.1, 1, 10, 10) per mille fractional error to neutralino masses (1, 2, 3, 4), respectively. Thanks to Steve Kom. Updated constants to PDG 2009 values.
• 20/01/10 [3.1.1]: Compilation issue on some OS fixed.
• 19/10/09 [3.1]: Changes to linear algebra classes by D Grellscheid mean that SOFTSUSY is some 2 times faster. Optimisation level now at 2 by default, leading to a further speed increase of a factor of 2. However, removing optimisation will lead to speed degradation. Change to mhiggs vector in the physPars object: it's now split into mh0, mA0, mH0, mHpm (should result in less bugs).

References

If you use SOFTSUSY to write a paper, please cite

There are detailed comparisons between SOFTSUSY and other publicly available programs in

• Precise Determination of the Neutral Higgs Boson Masses in the MSSM, B.C. Allanach, A. Djouadi, J.L. Kneur, W. Porod, P. Slavich, JHEP 0409 (2004) 044, hep-ph/0406166,
• Theoretical uncertainties in sparticle mass predictions from computational tools, B.C. Allanach, S. Kraml, W. Porod, JHEP 03 (2003) 045, hep-ph/0302102

Installation

The following releases contain a test program (main.cpp) and the SOFTSUSY library (libsoft.a, link with -L.libs -lsoft). There is also a Makefile: in linux, just unpack the files with (eg for softsusy-3.1)

> gunzip softsusy-3.1.tar.gz
> tar -xvf softsusy-3.1.tar 
> cd softsusy-3.1 

> ./configure
> make 

> ./softpoint.x
> ./softsusy.x
> ./rpvsoftsusy.x 

If you have trouble with compilation, try this page.

Executable files: after installation

• softpoint.x: command-line interface. SLHA2, GMSB, AMSB, mSUGRA and general boundary conditions possible.
• softsusy.x: example C++ test program - loops over tan beta, printing out Higgs masses around SPS1a.
• rpvsoftsusy.x: example R-parity violating test program - loops over l'_{331} for SPS1a, printing out the tau sneutrino mass.

Source Files

Input and info files

• [README] contains installation instructions and a list of included files
• [slha2Input] is an alternative input file in the SUSY Les Houches Accord 2 format for SPS1a'
• [slha2Output] is the result of running with the above input file and includes flavour violation, for inclusion into codes like SusyBsg1.3 which include flavour corrections
• [outputTest] is the output from the test program in main.cpp
• [rpvOutputTest] is the output from the test program in rpvmain.cpp
• [lesHouchesInput] is an input file in the SUSY Les Houches Accord format for SPS1a
• [lesHouchesOutput] is the result of running with the above input file, ie
  
• [rpvHouchesInput] is an alternative input file in the SUSY Les Houches Accord 2 format
• [rpvHouchesOutput] is the result of running with the above input file, ie
  softpoint.x leshouches < lesHouchesInput > lesHouchesOutput

Code

• [def.h] contains switches (options) and parameters such as default fermion masses, required accuracy etc
• List and description of files
• List and description of classes

Extensions

License

    SOFTSUSY Copyright (C) 2007 B.C. Allanach

    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    See http://www.gnu.org/licenses/.  

Ben Allanach's homepage: