"The number of incoming/outcoming fermions are different"

Asked by Joydeep Roy on 2018-03-29

Hello,

I was just trying to run on MG my own written model file with leptoquark (LQ) in it . I was trying to generate the process "p p > lq lq~ , (lq > t mu-, t > w+ b), (lq~ > t~ mu+, t~> w- b~) " , but there is an error message saying "The number of incoming/outcoming fermions are different".

There is no issue while making the UFO file on Mathematica, but the log file says that ''decay.py' not written' ! Can please anybody help with this problem ?

Thanks,
Joydeep

Question information

Language:
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Status:
Answered
For:
MadGraph5_aMC@NLO Edit question
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Last query:
2018-03-29
Last reply:
2018-03-30

Hi,

Did you try:
> p p > lq lq~ , (lq~ > t mu-, t > w+ b), (lq > t~ mu+, t~> w- b~)

The error means that you have some fermion flow issue that are obvious from your syntax.
Therefore it should be part of the decay.
More than that I can not comment.

Cheers,

Olivier

> On 29 Mar 2018, at 08:10, Joydeep Roy <email address hidden> wrote:
>
> New question #667326 on MadGraph5_aMC@NLO:
> https://answers.launchpad.net/mg5amcnlo/+question/667326
>
> Hello,
>
> I was just trying to run on MG my own written model file with leptoquark (LQ) in it . I was trying to generate the process "p p > lq lq~ , (lq > t mu-, t > w+ b), (lq~ > t~ mu+, t~> w- b~) " , but there is an error message saying "The number of incoming/outcoming fermions are different".
>
> There is no issue while making the UFO file on Mathematica, but the log file says that ''decay.py' not written' ! Can please anybody help with this problem ?
>
> Thanks,
> Joydeep
>
> --
> You received this question notification because you are an answer
> contact for MadGraph5_aMC@NLO.

Joydeep Roy (madubu17) said : #2

Thanks Olivier, for the suggestion. I tried that but there is new error message now:

"'PRIVATE 'GetInOrder[P$IndexDelta[Index[Gluon, Ext[1]], Index [Gluon, Int[1]]]]'

I don't understand this !

This means that your UFO format is wrongly formatted.
(It does not follow the convention)
Please check your model.

Cheers,

Olivier

> On 29 Mar 2018, at 20:37, Joydeep Roy <email address hidden> wrote:
>
> Question #667326 on MadGraph5_aMC@NLO changed:
> https://answers.launchpad.net/mg5amcnlo/+question/667326
>
> Joydeep Roy posted a new comment:
> Thanks Olivier, for the suggestion. I tried that but there is new error
> message now:
>
> "'PRIVATE 'GetInOrder[P$IndexDelta[Index[Gluon, Ext[1]], Index [Gluon,
> Int[1]]]]'
>
> I don't understand this !
>
> --
> You received this question notification because you are an answer
> contact for MadGraph5_aMC@NLO.

Joydeep Roy (madubu17) said : #4

Do you have any comment on why 'Decay.py' file is not generated ?

Joydeep

Did you ask FR to generate it?

Cheers,

Olivier

> On 30 Mar 2018, at 16:27, Joydeep Roy <email address hidden> wrote:
>
> Question #667326 on MadGraph5_aMC@NLO changed:
> https://answers.launchpad.net/mg5amcnlo/+question/667326
>
> Joydeep Roy posted a new comment:
> Do you have any comment on why 'Decay.py' file is not generated ?
>
> Joydeep
>
> --
> You received this question notification because you are an answer
> contact for MadGraph5_aMC@NLO.

Joydeep Roy (madubu17) said : #6

Is there any way to generate that while creating the '.fr' file ? I don't know that, I'm not an expert of Feynrules. Please let me know.

Thanks,
Joydeep

I'm not an FR expert either actually ( I do not have it install)
But yes you should run one specific command in FR to have that file written.
Look at their manual and/or tutorial to find such command.

Cheers,

Olivier

> On 30 Mar 2018, at 17:52, Joydeep Roy <email address hidden> wrote:
>
> Question #667326 on MadGraph5_aMC@NLO changed:
> https://answers.launchpad.net/mg5amcnlo/+question/667326
>
> Joydeep Roy posted a new comment:
> Is there any way to generate that while creating the '.fr' file ? I
> don't know that, I'm not an expert of Feynrules. Please let me know.
>
> Thanks,
> Joydeep
>
> --
> You received this question notification because you are an answer
> contact for MadGraph5_aMC@NLO.

Joydeep Roy (madubu17) said : #8

Okay, thanks for that information. I'll try to find that command.

Joydeep

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