MadGraph5_aMC@NLO

A new model need QCD process

Asked by Hongxin Wang

hi,
I am a complete beginner of Madgraph. I am trying to generate a new process: g g > h1 > h2 z [QCD] , and now I want z decay to e+ e- instead of the SM process, but when I type in "g g > h1 > h2 z > h2 e+ e- [QCD]" , The following error message is coming:

Command "generate g g > h1 > h2 z > h2 e+ e- [QCD]" interrupted with error:
InvalidCmd : wrong format for "g g > h1 > h2 z > h2 e+ e- [QCD]" this part requires one or two symbols '>', 3 found

Whether the SM particles cannot give a specific decay channel in MG5? or Is something wrong in my process?

Thanks ahead for the help!

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Hongxin Wang
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Olivier Mattelaer (olivier-mattelaer) said : 		#1

The syntax

> X > means that you are applying a diagram filtering to keep only diagram with at least one X in S-channel
> X Y > is that same but you require both X and Y to be at least one in S-Channel
> X > Y > syntax is NOT supported in the code

for your process you can try
generate g g > h1 Z > h2 e+ e- [QCD]

Cheers,

Olivier

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Hongxin Wang (ashleywang) said : 		#2

Thanks Olivier Mattelaer, that solved my question.