MadGraph5_aMC@NLO

Zero cross section

Asked by S.S.

Dear authors,

I have SM- like higgs have FCNC interactions, like bs~ and e+mu- .. when I try to generate a process like:

h > b~ s , it gives:

Survey return zero cross section.
   Typical reasons are the following:
   1) A massive s-channel particle has a width set to zero, etc.,

While I set the width of h to Auto in the run_card . But when I try to generate a process like:

h > e+ mu- , or , h > b b~

it works well. So how to solve this in MG ?

Thanks,
S.

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Olivier Mattelaer (olivier-mattelaer) said : 		#1

Hi,

Like this I do not see anything that can go wrong and which is not trivial./
My only guess is that your param_card set the coupling to zero for such decay.

Cheers,

Olivier
> On 8 Feb 2017, at 21:37, S.S. <email address hidden> wrote:
>
> New question #452837 on MadGraph5_aMC@NLO:
> https://answers.launchpad.net/mg5amcnlo/+question/452837
>
>
> Dear authors,
>
> I have SM- like higgs have FCNC interactions, like bs~ and e+mu- .. when I try to generate a process like:
>
> h > b~ s , it gives:
>
> Survey return zero cross section.
> Typical reasons are the following:
> 1) A massive s-channel particle has a width set to zero, etc.,
>
> While I set the width of h to Auto in the run_card . But when I try to generate a process like:
>
> h > e+ mu- , or , h > b b~
>
> it works well. So how to solve this in MG ?
>
> Thanks,
> S.
>
>
>
>
>
> --
> You received this question notification because you are an answer
> contact for MadGraph5_aMC@NLO.

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