SOFTSUSY Homepage

SOFTSUSY: by Ben Allanach

This code 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. It is written in C++ with an emphasis on easy generalisability. Full three-family couplings and 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 use SOFTSUSY to write a paper, please cite
B.C. Allanach, Comput. Phys. Commun. 143 (2002) 305-331, hep-ph/0104145,
which is the SOFTSUSY manual for the R-parity conserving MSSM. If you use the R-parity violating aspects, please cite
B.C. Allanach and M.A. Bernhardt, arXiv:0903.1805.
Versions of manuals on the electronic arXiv will be updated with more recent editions.
There are detailed comparisons between SOFTSUSY and other publicly available codes 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

To run SOFTSUSY, you should only need standard C++ libraries.

The following releases contain a test program (main.cpp) and the code for 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-3.0)
> gunzip softsusy-3.0.tar.gz
> tar -xvf softsusy-3.0.tar
> cd softsusy-3.0
then type
> ./configure
> make
There are three C++ test programs, which can be run by the commands
> ./softpoint.x
> ./softsusy.x
> ./rpvsoftsusy.x

Release 3.0.8 18/06/09

NB If you want to do quark mixing in the R-parity conserving MSSM, either use SLHA2 or the new object FlavourMssmSoftsusy.

Gzipped tarred [source 3.0.8 | RPC manual | RPV manual | documentation]:
Non-universal Higgs mass calls bug-fixed: in version 3.0, a bug was introduced which meant that the alternative SUSY-scale boundary conditions options wouldn't produce viable points. Thanks to Nazila Mahmoudi
21/05/09 [source 3.0.7] Small per mille errors in heavier higgs mass calculations: omission of some Goldstone diagrams in mA and factor of 2 missing in higgs contribution. Tadpoles used to calculate higgs masses now updated to latest iteration rather than the previous one. Thanks go to Pietro Slavich.
07/05/09 [source 3.0.6] Internal error labelling of mA and mH bug-fixed: will have a negligible effect unless the mA-mH splitting is large. Thanks to Pietro Slavich.
25/04/09 [source 3.0.5] There was a bug in SLHA2 when one used both flavour violation and specified EXTPARS. Fixed now - thanks to Pietro Slavich.
23/04/09 [source 3.0.4] Flavour violating boundary condition in SLHA2 fixed: previously was ignoring off-diagonal elements of MSU2IN, MSQ2IN etc offered by user. Thanks to Pietro Slavich.
21/04/09 [source 3.0.3] Switched flavour mixing in RPV case back on: thanks to Marja Hanussek.
18/03/09 [source 3.0.2]
Sneutrino VEVs were accidentally switched off in previous versions. This is fixed in 3.0.2: thanks to Marja Hanussek for noticing the bug. This will only affect results using lepton number violating couplings.
11/03/09 [source 3.0.1]
Inclusion of R-parity violation into SOFTSUSY. Inclusion of flavour violation interface to SLHA2 input/output format. Several minor bug fixes in loop corrections of chargino/neutralino masses. v3.0.1 has the flavour parts of SLHA2 fixed. Thanks to Pietro Slavich.

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

Contained in the gzipped tarred archive above, but can be obtained seperately here:

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 alternative input file in the SUSY Les Houches Accord format
[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

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:

Ben Allanach B2.04, DAMTP, CMS, University of Cambridge Wilberforce Road, Cambridge CB3 0WA, UK. Tel: +44 (0)1223 766889