0 cross-section when generating grid packs

Hi,

Sorry I do not have access to/ control on the wrapper that CMS is using in order to automate the run of the gridpack.

So in particular, I do not know the command that is used in order to print
 === Results Summary for run: GridRun_345678 tag: tag_1 ===

    Cross-section : 0 +- 0 pb
    Nb of events : 50000.

When I run a gridpack out of MG5aMC, we do not have such printout at all.
So I'm not sure if you use some internal function of MG5aMC that are not really designed for gridpack or if you use a code not part of MG5aC.

Maybe you can contact the MC group of CMS (you can put me in cc) to have a better understanding here.

Cheers,

Olivier

> On 28 Jul 2023, at 04:55, Zhiyuan <email address hidden> wrote:
>
> New question #707414 on MadGraph5_aMC@NLO:
> https://answers.launchpad.net/mg5amcnlo/+question/707414
>
> Hi Madgraph Expert,
> I am generating this process: generate p p > w+ > w+ h2, h2 > h1 h1using the following customization:
>
> set param_card frblock 1 1.00e+00
> set param_card frblock 2 9.9e-01
> set param_card higgs 3 0.00e+00
> set param_card mass 25 125.0
> set param_card mass 35 3000
>
> with model 2HDMtII_NLO.
>
> In the log file, I found that it prints out for the pilot run:
> === Results Summary for run: pilotrun tag: tag_1 ===
> Cross-section : 3.626e-07 +- 1.813e-09 pb
> Nb of events : 0，
>
> but in the following lines when it generate more events, it then prints out:
> === Results Summary for run: GridRun_345678 tag: tag_1 ===
>
> Cross-section : 0 +- 0 pb
> Nb of events : 50000.
>
> I wonder why the cross-section has become 0?
>
> Best,
> Jordan
>
>
>
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