WC JSON vs WC in SPheno output

[innes]

Hi there,

My program takes as input the WC_... .json file, feeds it to flavio and runs the WCs to the 4.2 GeV scale and evaluates them.

When i look at the Flavio output of C9 -- it appears to asymptote to a finite value rather than zero as I increase the scalar mediator mass. This doesn't seem to be right...

My suspicion is that I have perhaps incorrectly referenced the SM wilson coefficients in the definition of C9. As per the above. Perhaps I have mislabelled the SM operators such that I am never "minusing off" the SM contributions?

I am not very familiar with the flavorkit basis structure, however, so I can't immediately see that. Does it look like this might be the case?

I have attached the .m file.

[FStaub]

Hi,

I guess that you are sure that the flavio output which you use contains only the NP part?
As I asked before: did you look at the SPheno.spc where the coefficients also in the FLHA format are given. This should help to see if there is a problem/misunderstanding in calculating C9 or if it is a output problem in thw WCXF format.

Cheers,
Florian

[innes]

Hi Florian

I have tried to look at the output from SPheno.spc, but when i plot the NP contribution it appears to asymptote to a non-zero number in the limit of the mediator mass ---> inf.

Perhaps I am just unaware of the normalisation for C9 in FLHA. Resources on FLHA basis appear to be scarce for operators apart from C_1 - C_8.

Innes

[FStaub]

Hi,

I see three possibilities:
1) that's a bug
2) you have a non-decoupling behaviour in your model
3) there is another contribution which doesn't scale with the mass

Cheers
Florian