Higgs production via gluon fusion problem

Asked by Iris on 2018-06-25

Hi,

I am using MG5_aMC_v2.2.2. I tried to generate higgs through gluon fusion but I got an error message:
InvalidCmd : Born diagrams could not be generated for the process: g g > h WEIGHTED=4 [ all = QCD ]. Notice that aMC@NLO does not handle loop-induced processes yet, but you can still use MadLoop if you want to only generate them. For this, use the 'virt=' mode, without multiparticle labels.

I also tried adding hgg_plugin, but another error popped up:
Command "add model hgg_plugin" interrupted with error:
USRMODERROR : Base Model doesn't follows UFO convention
Please report this bug on https://bugs.launchpad.net/madgraph5
More information is found in 'MG5_debug'.
Please attach this file to your report.

Is it because of my version? Any help is appreciated!

Question information

Language:
English Edit question
Status:
Solved
For:
MadGraph5_aMC@NLO Edit question
Assignee:
No assignee Edit question
Solved by:
Olivier Mattelaer
Solved:
2018-06-26
Last query:
2018-06-26
Last reply:
2018-06-26

Hi,

You can do it via
import model heft
generate g g > h

This use EFT approximation obviously.
If you want the full loop computation with full mass effect,
then yes this is not possible with your version and you need to update.

Cheers,

Olivier

> On 25 Jun 2018, at 23:07, Iris <email address hidden> wrote:
>
> New question #670459 on MadGraph5_aMC@NLO:
> https://answers.launchpad.net/mg5amcnlo/+question/670459
>
> Hi,
>
> I am using MG5_aMC_v2.2.2. I tried to generate higgs through gluon fusion but I got an error message:
> InvalidCmd : Born diagrams could not be generated for the process: g g > h WEIGHTED=4 [ all = QCD ]. Notice that aMC@NLO does not handle loop-induced processes yet, but you can still use MadLoop if you want to only generate them. For this, use the 'virt=' mode, without multiparticle labels.
>
> I also tried adding hgg_plugin, but another error popped up:
> Command "add model hgg_plugin" interrupted with error:
> USRMODERROR : Base Model doesn't follows UFO convention
> Please report this bug on https://bugs.launchpad.net/madgraph5
> More information is found in 'MG5_debug'.
> Please attach this file to your report.
>
> Is it because of my version? Any help is appreciated!
>
> --
> You received this question notification because you are an answer
> contact for MadGraph5_aMC@NLO.

Iris (irislsc1122) said : #2

Hi Olivier,

Thanks for your prompt response. When I tried to update my version, this message showed up:

Error detected in "install update"
write debug file MG5_debug
If you need help with this issue please contact us on https://answers.launchpad.net/madgraph5
MadGraph5Error : This version of MG5 doesn't support auto-update. Common reasons are:
             1) This version was loaded via bazaar (use bzr pull to update instead).
             2) This version is a beta release of MG5.

Does that mean that I need to install everything from scratch if I want to use the latest version?

Yes, you should.

For such big gap of version this is the advised method anyway.

Cheers,

Olivier

> On 26 Jun 2018, at 21:46, Iris <email address hidden> wrote:
>
> Question #670459 on MadGraph5_aMC@NLO changed:
> https://answers.launchpad.net/mg5amcnlo/+question/670459
>
> Status: Answered => Open
>
> Iris is still having a problem:
> Hi Olivier,
>
> Thanks for your prompt response. When I tried to update my version, this
> message showed up:
>
> Error detected in "install update"
> write debug file MG5_debug
> If you need help with this issue please contact us on https://answers.launchpad.net/madgraph5
> MadGraph5Error : This version of MG5 doesn't support auto-update. Common reasons are:
> 1) This version was loaded via bazaar (use bzr pull to update instead).
> 2) This version is a beta release of MG5.
>
> Does that mean that I need to install everything from scratch if I want
> to use the latest version?
>
> --
> You received this question notification because you are an answer
> contact for MadGraph5_aMC@NLO.

Iris (irislsc1122) said : #4

Thanks Olivier Mattelaer, that solved my question.