Because i am a new user of SARAH package, i want to ask which is the relation of the two packages (SARAH and SPHENO), and if i have to download SPHENO as well?

Hi,

SPheno is is a stand-alone program which calculates masses and decay properties of supersymmetric particles for some models. SARAH generalizes this to a wide range of models including non-supersymmetric ones. It generates a Fortran code which uses generic routines provided by the SPheno package. Thus, if you want to use SARAH to generate a Fortran code, you also have to download SPheno.

Best, Werner

Thank you, Werner
Your comment has been very helpful!
Best regards
Ioannis