Zeros and equal numbers in restrict card

Asked by teddym

Hi MG authors:
     I found the restrict card is really useful. For my current case, in the full model, I do include the masses for all particles. There are also some coupling matrices there. By using default restriction card, I would like to set all light particle to massless. But I also want to keep all the coupling matrices as identity matrix. Is that possible? As if I set the coupling matrices to identity matrix, all zeros will disappear, and equal couplings will be merged into one. Is there any way to avoid that and also have an identity matrix in the output? Thanks!

Best
Ted

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Olivier Mattelaer (olivier-mattelaer) said :
#1

The best method is to set random value within the restrict_xxxx.dat file (or at least value where all compling stays non-vanishing) and to add a default value for all the parameter with a file param_xxxx.dat

Cheers,

Olivier

> On 13 Jul 2021, at 18:01, teddym <email address hidden> wrote:
>
> New question #697964 on MadGraph5_aMC@NLO:
> https://answers.launchpad.net/mg5amcnlo/+question/697964
>
> Hi MG authors:
> I found the restrict card is really useful. For my current case, in the full model, I do include the masses for all particles. There are also some coupling matrices there. By using default restriction card, I would like to set all light particle to massless. But I also want to keep all the coupling matrices as identity matrix. Is that possible? As if I set the coupling matrices to identity matrix, all zeros will disappear, and equal couplings will be merged into one. Is there any way to avoid that and also have an identity matrix in the output? Thanks!
>
>
> Best
> Ted
>
> --
> You received this question notification because you are an answer
> contact for MadGraph5_aMC@NLO.

Revision history for this message
teddym (niepanchongsheng) said :
#2

Hi Olivier:
     If we put param_xxxx.dat in the UFO folder, will the MG automatically copy it to the output folder?
     I guess that the "xxxx" in "param_xxxx.dat" should be the same as the "xxxx" in "restrict_xxxx.dat"?

Thanks!
Best
Ted

Revision history for this message
Olivier Mattelaer (olivier-mattelaer) said :
#3

Yes to both.

Cheers,

Olivier

> On 13 Jul 2021, at 20:30, teddym <email address hidden> wrote:
>
> Question #697964 on MadGraph5_aMC@NLO changed:
> https://answers.launchpad.net/mg5amcnlo/+question/697964
>
> Status: Answered => Open
>
> teddym is still having a problem:
> Hi Olivier:
> If we put param_xxxx.dat in the UFO folder, will the MG automatically copy it to the output folder?
> I guess that the "xxxx" in "param_xxxx.dat" should be the same as the "xxxx" in "restrict_xxxx.dat"?
>
> Thanks!
> Best
> Ted
>
> --
> You received this question notification because you are an answer
> contact for MadGraph5_aMC@NLO.

Revision history for this message
teddym (niepanchongsheng) said :
#4

Thanks!

Revision history for this message
teddym (niepanchongsheng) said :
#5

Thanks Olivier Mattelaer, that solved my question.

Revision history for this message
teddym (niepanchongsheng) said :
#6

Hi Olivier:
     With both "param_default.dat" and "restrict_default.dat" in the UFO folder, with "import model xxxx" the default restriction is applied. But the param_default.dat is not copied to the output folder. Is there anything I should set up?

Best
Ted

Revision history for this message
Olivier Mattelaer (olivier-mattelaer) said :
#7

Looks like my memory was not 100% accurate
one should use
paramcard_xxxx.dat and not param_xxxx.dat

Sorry for the confusion,

Olivier

> On 14 Jul 2021, at 00:20, teddym <email address hidden> wrote:
>
> Question #697964 on MadGraph5_aMC@NLO changed:
> https://answers.launchpad.net/mg5amcnlo/+question/697964
>
> Status: Solved => Open
>
> teddym is still having a problem:
> Hi Olivier:
> With both "param_default.dat" and "restrict_default.dat" in the UFO folder, with "import model xxxx" the default restriction is applied. But the param_default.dat is not copied to the output folder. Is there anything I should set up?
>
> Best
> Ted
>
> --
> You received this question notification because you are an answer
> contact for MadGraph5_aMC@NLO.

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