higgs to 4 fermions in long decay chains

Hi Daniele,

Did you use the last version of MG5?

Could you send me by email (omatt AT illinois.edu)
your param_card and run_card.
I suppose that you use the mssm model?

Cheers,

Olivier

On Nov 29, 2012, at 6:06 PM, Daniele Alves <email address hidden> wrote:

> New question #215602 on MadGraph5:
> https://answers.launchpad.net/madgraph5/+question/215602
>
> Hello,
>
> I'm trying to generate events for the following process in Madgraph:
>
> p p > ur ur~, (ur > u n2, (n2 > n1 h1, (h1 > w+ w-, w+ > l+ vl, w- > l- vl~))), (ur~ > u~ n2, (n2 > n1 h1, (h1 > w+ w-, w+ > l+ vl, w- > l- vl~)))
>
> The matrix elements are generated without a problem, but when I try to generate actual events it takes really long and I always end up quitting the generation before I can find out if it really works out.
>
> Any ideas on why this is happening and how to solve it would be much appreciated!
>
> Daniele
>
> --
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Hello Daniele,

I guess you're using a Higgs mass around 125 GeV? In that case, it can't decay into two onshell W's, as indicated by your decay chain syntax. What you need for the Higgs decays is "h1 > w+ w- > l+ vl l-vl~", indicating that you require s-channel W+ and W- propagators, but don't require them to be onshell.

All the best,
Johan