how to modify the triplet higgs coupling constant when generate pair higgs at LHC?

Asked by Adam Pan on 2018-10-26

I wanna use MadGraph5_aMC to generate p p > h h at the learding order in SM, and modify the triplet higgs coupling as need. How can I make it?

Question information

Language:
English Edit question
Status:
Solved
For:
MadGraph5_aMC@NLO Edit question
Assignee:
No assignee Edit question
Solved by:
Olivier Mattelaer
Solved:
2018-10-27
Last query:
2018-10-27
Last reply:
2018-10-26

Hi,

You will need to modify the UFO model to have this to work.
and typically
1) add a free parameter (in parameters.py) that would be include in the param_card
2) add a new coupling (in couplings.py) (typically define it as the free parameter or as the original coupling times the free parameter)
3) change the h h h interaction in order to use this new coupling.

Cheers,

Olivier

PS: This is obviously if you want to only change that coupling (not touching to h h h h vertex) if you want to make something better/more consistent, you would need to go to the FeynRules level.

Adam Pan (adampan) said : #2

Thanks Olivier Mattelaer, that solved my question.