Process is generating after specifying QED order

Asked by shibasipu on 2017-08-25

Hi Olivier,
                       I have implemented a new physics model in feynrules. Now, I am testing some of the SM processes.
Two exercies
============
Exercise-1
==================
MG5_aMC> generate p p > z z
INFO: Checking for minimal orders which gives processes.
INFO: Please specify coupling orders to bypass this step.
Command "generate p p > z z " interrupted in sub-command:
"generate p p > z z" with error:
KeyError : '1'
Please report this bug on https://bugs.launchpad.net/mg5amcnlo
More information is found in 'MG5_debug'.
Please attach this file to your report.

Exercise-2
================
MG5_aMC> generate p p > z z QED<=99
INFO: Trying process: g g > z z QED<=99 @1
INFO: Trying process: u u~ > z z QED<=99 @1
INFO: Process has 2 diagrams
INFO: Trying process: u c~ > z z QED<=99 @1
INFO: Trying process: c u~ > z z QED<=99 @1
INFO: Trying process: c c~ > z z QED<=99 @1
INFO: Process has 2 diagrams
INFO: Trying process: d d~ > z z QED<=99 @1
INFO: Process has 2 diagrams
INFO: Trying process: d s~ > z z QED<=99 @1
INFO: Trying process: s d~ > z z QED<=99 @1
INFO: Trying process: s s~ > z z QED<=99 @1
INFO: Process has 2 diagrams
INFO: Process u~ u > z z added to mirror process u u~ > z z
INFO: Process c~ c > z z added to mirror process c c~ > z z
INFO: Process d~ d > z z added to mirror process d d~ > z z
INFO: Process s~ s > z z added to mirror process s s~ > z z
4 processes with 8 diagrams generated in 0.127 s
Total: 4 processes with 8 diagrams
=================================

For the Error in Ex-1, i have followed this FAQ https://answers.launchpad.net/mg5amcnlo/+faq/2460
i hope, i have correctly specified the orders for all the parameters.

Please suggest where could be other possible mistakes.

Regards,
Shiba

Question information

Language:
English Edit question
Status:
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MadGraph5_aMC@NLO Edit question
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Last query:
2017-08-25
Last reply:
2017-08-25

Hi,

The problem typically occurs when you assign parameter with negative order. (Like in the standard model of FR, the vev is assigned to QED=-1)
Therefore it is possible that some coupling are assigned to zero coupling even if all parameter are assigned to some coupling.
I'm not an expert on this and all the information that I have is in the FAQ.
Please read the FAQ, the FR manual section pointed in the FAQ and if this is not enough, then contact the FR author which should be able to help you on this matter.

Cheers,

Olivier

> On 25 Aug 2017, at 09:03, shibasipu <email address hidden> wrote:
>
> New question #656944 on MadGraph5_aMC@NLO:
> https://answers.launchpad.net/mg5amcnlo/+question/656944
>
> Hi Olivier,
> I have implemented a new physics model in feynrules. Now, I am testing some of the SM processes.
> Two exercies
> ============
> Exercise-1
> ==================
> MG5_aMC> generate p p > z z
> INFO: Checking for minimal orders which gives processes.
> INFO: Please specify coupling orders to bypass this step.
> Command "generate p p > z z " interrupted in sub-command:
> "generate p p > z z" with error:
> KeyError : '1'
> Please report this bug on https://bugs.launchpad.net/mg5amcnlo
> More information is found in 'MG5_debug'.
> Please attach this file to your report.
>
>
> Exercise-2
> ================
> MG5_aMC> generate p p > z z QED<=99
> INFO: Trying process: g g > z z QED<=99 @1
> INFO: Trying process: u u~ > z z QED<=99 @1
> INFO: Process has 2 diagrams
> INFO: Trying process: u c~ > z z QED<=99 @1
> INFO: Trying process: c u~ > z z QED<=99 @1
> INFO: Trying process: c c~ > z z QED<=99 @1
> INFO: Process has 2 diagrams
> INFO: Trying process: d d~ > z z QED<=99 @1
> INFO: Process has 2 diagrams
> INFO: Trying process: d s~ > z z QED<=99 @1
> INFO: Trying process: s d~ > z z QED<=99 @1
> INFO: Trying process: s s~ > z z QED<=99 @1
> INFO: Process has 2 diagrams
> INFO: Process u~ u > z z added to mirror process u u~ > z z
> INFO: Process c~ c > z z added to mirror process c c~ > z z
> INFO: Process d~ d > z z added to mirror process d d~ > z z
> INFO: Process s~ s > z z added to mirror process s s~ > z z
> 4 processes with 8 diagrams generated in 0.127 s
> Total: 4 processes with 8 diagrams
> =================================
>
> For the Error in Ex-1, i have followed this FAQ https://answers.launchpad.net/mg5amcnlo/+faq/2460
> i hope, i have correctly specified the orders for all the parameters.
>
> Please suggest where could be other possible mistakes.
>
>
> Regards,
> Shiba
>
>
> --
> You received this question notification because you are an answer
> contact for MadGraph5_aMC@NLO.

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