FeynHiggs: overview and old versions
FeynHiggs is a Fortran code for the
diagrammatic calculation of the masses of the masses and mixings of
the Higgs bosons in the MSSM at the twoloop level.
There are several versions:

The real and complex case including Higgs decays:
FeynHiggs2.6.1
This version includes all features ever implemented into FeynHiggs:
 complete set of oneloop corrections
 all known twoloop corrections applicable in FeynmanDiagrammatic
approach
 evaluation of the charged Higgs sector

evaluation of the theory error of the Higgs masses and mixing angles
due to unknown higherorder corrections
 evaluation of the leading corrections from NMFV models
 evaluation of the Zfactors needed to obtain correct properties
for external (onshell) Higgs bosons
 evaluation of all relevant mixing matrices
 complete set of Higgs decay branching ratios
 additional couplings: Higgs gauge boson, Higgs self couplings
 the Higgs production cross section at the Tevatron and at the LHC
 transistion from onshell to DRbar (and vice versa) parameters
 easy link to other Fortran/C++ codes
 easy link within Mathematica
 help via man pages
 SPS benchmark scenarios and Les Houches benchmark scenarios are
given as predifined input
 FH2.2 or higher is able to process
Les Houches Accord data
(see
hepph/0408283
by T. Hahn)
 The following check items are evaluated:
 one and twoloop contributions to
(g2)_{mu}, see
hepph/0312264,
hepph/0405255
(by S. Heinemeyer, D. Stöckinger, G. Weiglein) for details.
 one and twoloop contributions to Delta rho
MW and sin^{2}(theta_{eff}) incl. NMFV effects
 BR(b > s gamma) incl. NMFV effects, see
hepph/0512315
(by T. Hahn, W. Hollik, J. Illana, S. Penaranda) for details.
For FeynHiggs2.6.1, go here.

The main differences are:

FeynHiggs2.1 requires LoopTools for the evaluation of the
involved three point functions.
LoopTools can be found
here.
 These two codes are in general less advanced, but have gone through
more checks
For FeynHiggs2.5, 2.4, 2.3, 2.2, 2.1, go
here.

This is a thoroughly tested but outdated version including
 all existing (FD) higherorder corrections
 transistion from onshell to DRbar (and vice versa) parameters
 various benchmark scenarios as possible default input
 evaluation of the leading corrections from NMFV models
For this code, go here.

The real case including Higgs decays:
FeynHiggsDecay1.5.1
This is a thoroughly tested version including
 all FeynHiggs1.5.1 features (except the NMFV option)
 all relevant decay channels for the neutral Higgs bosons
For this code, send an email to
Sven Heinemeyer.
Alternative option: use FeynHiggs2.x.
It has all the features of FeynHiggsDecay!
We strongly recommend to use FeynHiggs2.x.
Development and support for FeynHiggs1.x has stopped.
All features available in FeynHiggs1.x are also included in FeynHiggs2.x.
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