Which cuts could lead to different differential distributions

They are two hidden cuts:

1) one related to the maximum value of the matrix-element, it typically only trigger if you have huge divergency in the matrix-element. The threshold is set extremelly high such that in practise even in case of divergency it mainly remove the "not an number". (when that trigger starts to play you are typically in trouble to generate events (and very very large cross-section obviously)
So I guess that this is not your issue.

2) If you use the default dynamical scale, all event with a very low scale (less that 4 GeV^2) will also be cut.
Here you can remove such implicit cut by using a fixed scale or another type of scale.

Cheers,

Olivier

> On 29 Sep 2021, at 12:45, Steven Jeremies <email address hidden> wrote:
>
> New question #698910 on MadGraph5_aMC@NLO:
> https://answers.launchpad.net/mg5amcnlo/+question/698910
>
> Hello,
>
> I generated the partonic process p p > j t with madgraph in order to compare it with my own calculations. The cross section results agree with each other, so do the differential distributions for the top quark. However, for the light quark it does not anymore. For example when histogramming the energy of the light quark my peaks are a lot higher in the region from 0 to 500GeV (sqrts(s)=13TeV). When generating the process I wanted to erase all parton cuts with "no_parton_cut" but it seems to me there must be some cut left which causes this problem. I looked into the run_card but did not find anything suspicious. Do you have an idea from what this difference could result from?
>
> Thanks in advance!
>
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