On the Wiki page Flags in SPheno LesHouches file, two flags related to output for micrOMEGAs are described:

• 50 if 1, negative fermion masses are rotated to real ones by multiplying the rotation matrix with i; default is 1
• 77 if 1, output is written to be used with MicrOmegas: running masses for light quarks are written instead of pole masses (necessary for the direct detection calculation) and real rotation matrices for Majorana fermions are used; default is 0

In the SLHA input file generated by SARAH, there are also the following comments:

Code: Select all

Block SPhenoInput   # SPheno specific input
 …
 50 1               # Majorana phases: use only positive masses (put 0 to use file with CalcHep/Micromegas!)
 …
 77 0               # Output for MicrOmegas (running masses for light quarks; real mixing matrices)

But these two flags seem redundant/contradictory to me (for example, what happens if I set both flags 50 and 77 to 1)? Should I just use

• 50 = 0, 77 = 1 for micrOMEGAs,
• 50 = 1, 77 = 0 else?

Also, I think there is a typo in the sentence for flag 50 on the Wiki page:

negative fermion masses are rotated to real ones

should probably be

negative fermion masses are rotated to positive ones

Hi,

yes, these two flags are related. However, flag 77 not only applies flag 50 but also small other changes as described. Therefore, if you set 77 to 1, it doesn't matter what you put for 50 (at least if you don't change the order).

Thus, if you want to use the file with MO, use 77->1

Cheers,
Florian