MadGraph5_aMC@NLO

How to get SM higgs production cross section via gluon-gluon interation

Asked by Will Flanagan

Hi Madgraph Experts,

I am trying to get a cross section for SM higgs production of gluon-gluon to higgs via a top quark loop. Visually, I mean this well-know diagram:
http://hepr8.physics.tamu.edu/will/Diagram.pdf

I am having a hard time figuring out the proper syntax.

I can certainly generate the first half of the diagram:
generate g g > t t~

And I can certainly generate the second half of the diagram:
generate t t~ > h

But I can't seem to put it together with syntax such as "g g > h QCD=2 QED=1"

Thanks in advance!
Will

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Will Flanagan
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Olivier Mattelaer (olivier-mattelaer) said : 		#1

Hi Will,

Loop induce process are not supported right now.
But you can use the Higgs Effective Field Theory (https://cp3.irmp.ucl.ac.be/projects/madgraph/wiki/Models/HiggsEffective)
which adds an effective vertex g g h.

you can then generate the process via the two following commands:
import model heft
generate g g > h

Cheers,

Olivier

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Will Flanagan (will-flanagan) said : 		#2

Thats very helpful. Thanks Olivier for the reply!