NLO model file LO generation

Yes it is expected, the
LO from NLO is following cuts/scale/PDF of the NLO comptuation (since the goal here is to compute K-factor) which are not identical to the cuts/scale/PDF used wihtin the LO computation.

So if you do not tune those to be identical, yes they will be different number.

Cheers,

Olivier

> On 26 Jun 2023, at 12:10, Guglielmo Coloretti <email address hidden> wrote:
>
> New question #707104 on MadGraph5_aMC@NLO:
> https://answers.launchpad.net/mg5amcnlo/+question/707104
>
> Dear all,
>
> Again here I am with another question. I tried to generate a simple HV process using the SM model file at NLO: generate p p > z h [QCD]
>
> I then computed the cross section at LO without any parton shower and obtained: 0.63402 ± 0.00236 (pb).
>
> I then generated the same process but at LO with: generate p p > z h
>
> Computing the cross section without parton shower I obtained: 0.57992 ± 0.000574 (pb).
>
> Is this difference expected?
>
> I thank you very much for your time!
>
> Best regards,
> Guglielmo
>
>
>
> --
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> contact for MadGraph5_aMC@NLO.

Dear Olivier,

My bad. I did not think about it. Thank you very much again and apologies for the question! :)

Best regards,
Guglielmo Coloretti