hardcoded input parameters in complex mass scheme
Bug #1709675 reported by
Gauthier
This bug affects 1 person
Affects | Status | Importance | Assigned to | Milestone | |
---|---|---|---|---|---|
MadGraph5_aMC@NLO |
New
|
Wishlist
|
Unassigned |
Bug Description
Dear MG Developers,
When the complex mass scheme is activated, the function "change_
This leads to the very puzzling fact that LO results with complex_mass_scheme set on and off are different. Comparing a LO run without complex mass scheme and a NLO run with it would also lead to wrong k factors.
For consistency, wouldn't it be preferable to fetch electroweak parameters from the model?
Cheers,
Gauthier
Changed in mg5amcnlo: | |
importance: | Undecided → Wishlist |
To post a comment you must log in.
Hi Gauthier,
On the principle, I would agree but this is not always the desire way. mass_scheme, you typically do not care about keeping alpha_ew real, and prefer to have a better control on the mass of the W and Z.
If you want to keep the consistency then you would want to keep alpha_ew real and set the other parameter in a consistent way. But if you use complex_
I'm not against any development in that direction but I'm not going to invest time myself in that direction. Now if you provide a patch (or succeed to convince someone to implement such change I would be happy to review those change and include it in the next version of the code)
Cheers,
Olivier