ggF for large Higgs Mass

Hi,

The model heft is valid in the limit m_h/(2mt) < 1, since it correspond to the (first term of the ) Taylor Expansion in that parameter.
Physically, it means that you start to probe the loop and therefore you need an accurate representation of the loop.

So you really need to integrate the loop-induced process. Such computation are not (yet) available in our framework.
We are actively working on having such computation public but we still need to improve stability for complicated processes.

The next major revision of MG5_aMC will be able to handle this kind of process.

Cheers,

Olivier

On 28 Jan 2015, at 23:36, Felix Kling <email address hidden> wrote:

> New question #261366 on MadGraph5_aMC@NLO:
> https://answers.launchpad.net/mg5amcnlo/+question/261366
>
> Hi,
>
> I want to generate the LO gluon gluon fusion cross section for large Higgs masses (mH>mt). If I use the the heft-model file gives me cross section that start to increase again for mH>mt instead of decreasing.
>
> Here are the Madgraph Input that I have used:
> import model heft
> generate g g > h
> output ggH
> Afterwards I changed the Higgs mass in the param_card.dat to the mass I want.
>
> These are the results I obtained for a 100 TeV machine (same problem for 14 TeV):
> mH[GeV] XSection[pb] for gg>h
> 100 565.27
> 200 229.22
> 300 153.22
> 400 150.26
> 600 413.99
> 800 2366.7
> 1000 13793.0
>
> Obviously the large mass behaviour is wrong. Do you know what I am doing wrong and how I can fix this problem?
>
> Thank you for your help!
>
> Felix
>
>
>
>
>
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