Issue when generating one loop gluon fusion to higgs

Asked by Artemis Sofia Giannakopoulou

Hello,

I am working with a 2HDM trying to generate g g > h2 > h1 h1. I am using the 2HDM_NLO UFO file that is available here http://feynrules.irmp.ucl.ac.be/wiki/2HDM . When I execute the following commands:
import model 2HDM_NLO
generate g g > h2 > h1 h1 [QCD]

I get the following error:

INFO: Checking for minimal orders which gives processes.
INFO: Please specify coupling orders to bypass this step.
INFO: Trying coupling order WEIGHTED<=4: WEIGTHED IS QCD+2*QED
INFO: Trying coupling order WEIGHTED<=5: WEIGTHED IS QCD+2*QED
INFO: Trying coupling order WEIGHTED<=6: WEIGTHED IS QCD+2*QED
INFO: Trying coupling order WEIGHTED<=7: WEIGTHED IS QCD+2*QED
Error detected in "generate g g > h2 > h1 h1 [QCD]"
write debug file MG5_debug
If you need help with this issue please contact us on https://answers.launchpad.net/mg5amcnlo
str :
        Automatic process-order determination lead to negative constraints:
        QED: 6, QCD: -4
        Please specify the coupling orders from the command line.

I also tried generating g g > h using the loop_sm UFO. I get a similar error:
import model loop_sm
MG5_aMC>generate g g > h [QCD]
INFO: Checking for minimal orders which gives processes.
INFO: Please specify coupling orders to bypass this step.
INFO: Trying coupling order WEIGHTED<=2: WEIGTHED IS QCD+2*QED
INFO: Trying coupling order WEIGHTED<=3: WEIGTHED IS QCD+2*QED
Error detected in "generate g g > h [QCD]"
write debug file MG5_debug
If you need help with this issue please contact us on https://answers.launchpad.net/mg5amcnlo
str :
        Automatic process-order determination lead to negative constraints:
        QED: 3, QCD: -2
        Please specify the coupling orders from the command line.

I am using MG5_aMC_v3_4_2.

Is there a way to get madgraph to perform this calculation?

Thank you,
Artemis

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Olivier Mattelaer (olivier-mattelaer) said :
#1

You can use the official syntax for loop-induced processes:
generate g g > h2 > h1 h1 [noborn=QCD]
and
generate g g > h [noborn=QCD]

Cheers,

Olivier

Revision history for this message
Artemis Sofia Giannakopoulou (artemisg1) said :
#2

Great, thanks a lot!

On Tue, Mar 28, 2023 at 5:15 PM Olivier Mattelaer <
<email address hidden>> wrote:

> Your question #705990 on MadGraph5_aMC@NLO changed:
> https://answers.launchpad.net/mg5amcnlo/+question/705990
>
> Status: Open => Answered
>
> Olivier Mattelaer proposed the following answer:
> You can use the official syntax for loop-induced processes:
> generate g g > h2 > h1 h1 [noborn=QCD]
> and
> generate g g > h [noborn=QCD]
>
> Cheers,
>
> Olivier
>
> --
> If this answers your question, please go to the following page to let us
> know that it is solved:
>
> https://answers.launchpad.net/mg5amcnlo/+question/705990/+confirm?answer_id=0
>
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> following page to enter your feedback:
> https://answers.launchpad.net/mg5amcnlo/+question/705990
>
> You received this question notification because you asked the question.
>

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Launchpad Janitor (janitor) said :
#3

This question was expired because it remained in the 'Open' state without activity for the last 15 days.