SARAH- Output

[phy1002]

Hi Florian,

I try to generate 2d2L process in SM. At Folder : SARAH-4.9.3/Output/SM/EWSB/TeX/FlavorKit$ , I can find all the diagrams contributing to this process, consider for instance PengV2d2L .. in the generated pdf file i find many Feynman diagrams, for each one there is say " PSOddllVLL " , is there any way to compute or show the sum or the final analytic expression for all " PSOddllVLL " of all diagrams in Observable_PengV2d2L.pdf file ?


Best .

[FStaub]

You can only use SPheno for a numerical calculation of all diagrams. An analytical summation is not present, and would also not be very helpful since it would just result in unreadable long expressions.

Cheers
Florian

[phy1002]

Hi Florian,

I'm now in the same case, i.e., generating 2d2L process, is it possible that Observable_PengV2d2L.pdf file contains only one diagram ? in that case if "PSOddllVLL" is in observables, it's value will be for some specified diagram , I don't know if this 'd be some sort of "filter" can be made in Pre-SARAH..

Actually i'd like to make that because i have many generated diagrams in my process, and 'd like to compare which one is the dominant.


Thanks for your help ..

[FStaub]

No. And such a study would also be very misleading: usually there are large cancellation of diagrams, i.e. the total sum of all diagrams is much smaller than the biggest contribution.

Cheers
Florian