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FlavorKit 
by W. Porod, F. Staub, A. Vicente
(pre-release with SARAH 4.2.0beta)
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The aims of the FlavorKit functionality are
 - a modular implementation of precision observables in
   SARAH and SPheno
 - an automatized calculation of the necessary operators
 - providing the possibility to the user to add new 
   observables and operators to SARAH/SPheno

Realization:
 - The entire implementation of precision observables 
   is no longer hardcoded in SARAH but based on external 
   files which are put into the sub-directoy 
   "FlavorKit" of SARAH
 - The necessary input files for the generic expressions
   of the operators are generated by another Mathematica
   package which makes use of FeynArts/FormCalc. This 
   package is going to be made public with the final release
   of the FlavorKit. 
 - Observables are defined by 
    1) a steering file .m which defines the 
       necessary operators as well as the variables
       which are written to the SPheno spectrum file
    2) a file with the necessary lines of Fortran source code 
       to calculate the observables from the operators

Examples: 
We have made use of the new functionality to (re-) implement the
following observables in SARAH:
 - Lepton Flavor violating observables (SARAH/FlavorKit/LFV/):
   1) l -> l' gamma
   2) l -> 3 l'
   3) mu-e conversion
   4) tau -> l + meson
   5) Z -> l l'
   6) h -> l l'
 - Quark Flavor violating observables (SARAH/FlavorKit/QFV/):
   1) b -> s gamma
   2) B_s -> l l', B_d -> l l'
   3) B -> s l l'
   4) B -> q nu nu
   5) Delta M_K, epsilon_K
   6) Delta M_Bs, Delta M_Bd
   7) K^+ -> pi^+ nu nu
   8) K_L -> pi_L nu nu
   9) B -> K mu mu 
  10) B^+ -> tau nu
  11) D -> mu nu
  12) D_s -> mu nu, D_s -> tau nu
  13) K -> mu nu

A complete documentation is published soon.