Modifying couplings in loop processses
Dear MadGraph Developers,
I would like to study the gg->Zh process considering both the triangle and box quark loop contributions with the following couplings modified:
The only information I'd like to extract is the cross section for these loop processes for different partonic energies.
I understand you can use the 'loop_sm' UFO model to study this process in SM. Tracing back from 'vertices.py' I have identified
GC_32, GC_37, GC_22 and GC_23 as the relevant coupling parameters.
My naive idea for tackling this problem is to modify the UFO file by:
- introducing three new coupling modifier parameters in the 'parameters.py'
- modify the there couplings in 'couplings.py' accordingly by introducing these couplings modifiers
Question at this point:
- Are these modifications enough, or should I also alter the couplings in 'CT_couplings?'
If the answer to the above yes, I'd need to change them; then how should I proceed modifying the couplings counter terms? Do I need go back a level to generate UFO model with modified couplings with FeynRules? Or is there a simpler approach?
Thank you for the help in advance.
Can you help with this problem?
Provide an answer of your own, or ask David Englert for more information if necessary.