MadGraph5_aMC@NLO

Simple calculation

Asked by Sebastian Urrutia-Quiroga

Hi!
I want to generate the following process: p p > h > e+ e-

If I write
MG5_aMC>generate p p > h > e+ e-

I get
INFO: Checking for minimal orders which gives processes.
INFO: Please specify coupling orders to bypass this step.
INFO: Trying process: g g > h > e+ e- WEIGHTED=4
INFO: Trying process: u u~ > h > e+ e- WEIGHTED=4
INFO: Trying process: u c~ > h > e+ e- WEIGHTED=4
INFO: Trying process: c u~ > h > e+ e- WEIGHTED=4
INFO: Trying process: c c~ > h > e+ e- WEIGHTED=4
INFO: Trying process: d d~ > h > e+ e- WEIGHTED=4
INFO: Trying process: d s~ > h > e+ e- WEIGHTED=4
INFO: Trying process: s d~ > h > e+ e- WEIGHTED=4
INFO: Trying process: s s~ > h > e+ e- WEIGHTED=4
INFO: Trying process: u~ u > h > e+ e- WEIGHTED=4
INFO: Trying process: c~ c > h > e+ e- WEIGHTED=4
INFO: Trying process: d~ d > h > e+ e- WEIGHTED=4
INFO: Trying process: s~ s > h > e+ e- WEIGHTED=4
Command "generate p p > h > e+ e-" interrupted with error:
NoDiagramException : No amplitudes generated from process Process: g/u/c/d/s/u~/c~/d~/s~ g/u/c/d/s/u~/c~/d~/s~ > h> e+ e- WEIGHTED=4. Please enter a valid process

What I am doing wrong?
Thanks,
Sebastian

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MadGraph5_aMC@NLO Edit question
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Olivier Mattelaer
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Best Olivier Mattelaer (olivier-mattelaer) said : 		#1

Hi,

The syntax that you use is for a tree level computation.
For loop induced processes, you should refer to the very recent paper:
arXiv:1507.00020: Automated event generation for loop-induced processes

in that context, you need to use the following syntax:
import model loop_sm-full
generate p p > h > e+ e-

Cheers,

Olivier

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Olivier Mattelaer (olivier-mattelaer) said : 		#2

sorry the correct syntax is

import model loop_sm-full
generate p p > h > e+ e- [QCD]

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Sebastian Urrutia-Quiroga (sgurruti) said : 		#3

Perfect... thanks!

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Sebastian Urrutia-Quiroga (sgurruti) said : 		#4

Thanks Olivier Mattelaer, that solved my question.