Cross section of madgraph higgs production

Hi,

It is well known that the LO cross-section for this process under-estimates a lot both the central value but also the theoretical uncertainties.
This being said using heft introduces additional approximation:
1) the bottom quark loop is not included in the computation (including it decreases even more the LO cross-section actually)
2) you can not describe any kinematics where scale is higher than the top quark mass (which is fine for p p > h at LO)

But yes, you will have to scale the weights in this case.

Cheers,

Olivier

> On 3 Jun 2019, at 15:57, Ta'el Coren <email address hidden> wrote:
>
> New question #681212 on MadGraph5_aMC@NLO:
> https://answers.launchpad.net/mg5amcnlo/+question/681212
>
> Dear Madgraph team.
> I'm currently trying to simulate higgs production (gloun-gloun fusion) by using the model heft.
> When I generate the process (generate P P > H) I get a production cross section of 17.62 ipb.
> Comparing this to the CERN yellow pages, which is 43.92 ipb at a center of mass energy of 13 TeV, there is a factor of 2.5 difference between the two.
> What is the source of this discrepancy? Is it because the yellow pages compute it at NNLO while madgraph works at LO?
> How do I go about solving this issue? Is there a way to get the correct cross section from MadGraph, or should I just scale the events (give them appropriate weights) to match the cross section from the literature?
>
> Thank you for the help
> -Ta'el COren
>
>
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