set condition on effective operators in autowidth calculation

Asked by Tania Robens on 2019-12-16

Dear authors,

I apologize if this question has already been answered here/ in a tutorial/ ... . I was wondering whether it is possible to set a condition on an effective operator (e.g. should only be used if in validity regime, e.g. set by masses or other parameters) somewhere such that is it also respected by autowidth. I found a way to do this in the actual partial decay width calculation using madgraph itself (e.g. for a > b c), but somehow this condition does not get transferred to the autowidth calculation, even if I include it in couplingsx.f or intparam_definition.inc in Source/MODEL. Is there a way to do this ? Or alternatively, to exclude certain decay channels when using autowidth ?

If you have some tutorial/ documentation re this please point me to it.

Thanks a lot in advance

Best wishes Tania

Question information

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Last query:
2019-12-16
Last reply:
2019-12-16

Hi,

I'm not sure to fully understand your question.
Now if the question is: "is it possible to pass parameter to the auto entry in the param_card"
then the answer is no. However the "auto" option is just a shortcut to a module sometimes call MadWidth which can be call from a lot of places in the code and which allow a couple of parameter as described in the associated paper: http://arxiv.org/abs/arXiv:1402.1178

This being said what you try to do seems to be too complicated to be handle via options.
But the paper describe how the 2 body decay is handle (in a pure python way) and this should allow you to edit the UFO model in order to implement what you want.

Cheers,

Olivier

> On 16 Dec 2019, at 16:13, Tania Robens <email address hidden> wrote:
>
> New question #687179 on MadGraph5_aMC@NLO:
> https://answers.launchpad.net/mg5amcnlo/+question/687179
>
> Dear authors,
>
> I apologize if this question has already been answered here/ in a tutorial/ ... . I was wondering whether it is possible to set a condition on an effective operator (e.g. should only be used if in validity regime, e.g. set by masses or other parameters) somewhere such that is it also respected by autowidth. I found a way to do this in the actual partial decay width calculation using madgraph itself (e.g. for a > b c), but somehow this condition does not get transferred to the autowidth calculation, even if I include it in couplingsx.f or intparam_definition.inc in Source/MODEL. Is there a way to do this ? Or alternatively, to exclude certain decay channels when using autowidth ?
>
> If you have some tutorial/ documentation re this please point me to it.
>
> Thanks a lot in advance
>
> Best wishes Tania
>
> --
> You received this question notification because you are an answer
> contact for MadGraph5_aMC@NLO.

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