I want to generate PP collision decay into higgs and higgs decay into WW or ZZ boson.

Hi,

Are you interested only in cross-section and/or differential cross-section.
If it is the first, then madgraph is likely not the tool you are looking for since the computation
is at LO (and therefore much smaller than the N3LO one/experimental one).

Otherwise, they are two ways to do it
1) using the infinite top mass limit:
import model heft
define decay = l+ l- vl vl~ ta+ ta- vt vt~
generate g g > h, h > 4decay
output
launch

2) not using the infinite top mass limit (and therefore loop induced mode)
define decay = l+ l- vl vl~ ta+ ta- vt vt~
generate g g > h QED=1 [noborn=QCD]
output
launch
madspin=none
decay h > 4decay

Cheers,

Olivier

> On 14 Jun 2022, at 13:25, mihir hemantkumar patel <email address hidden> wrote:
>
> New question #702173 on MadGraph5_aMC@NLO:
> https://answers.launchpad.net/mg5amcnlo/+question/702173
>
> How can I generate these? I want to calculate cross-sections for the different masses of Higgs.
>
> --
> You received this question notification because you are an answer
> contact for MadGraph5_aMC@NLO.

Dear @olivier Mattelaer

I got this message.
MG5_aMC>import model heft
INFO: Restrict model heft with file ../models/heft/restrict_default.dat .
INFO: Run "set stdout_level DEBUG" before import for more information.
INFO: Change particles name to pass to MG5 convention
Kept definitions of multiparticles p / j / l+ / l- / vl / vl~ unchanged
Defined multiparticle all = g u c d s u~ c~ d~ s~ a ve vm vt e- mu- ve~ vm~ vt~ e+ mu+ t b t~ b~ z w+ h h1 w- ta- ta+
MG5_aMC>generate g g > h QED=1 [noborn=QCD]
The current model heft does not allow to generate loop corrections of type ['QCD'].
Command "generate g g > h QED=1 [noborn=QCD]" interrupted with error:
InvalidCmd : The model heft cannot handle loop processes

I am using v3.4.0 and "set auto_convert_model T" is already set. How can I change it to heft?

Hi,

Here you mix the two modes.
the loop-induced syntax is indeed not valid for the heft model and the tree-level syntax is not valid within the standard model.

Cheers,

Olivier