MadGraph5_aMC@NLO

problem with reducing number of events

Asked by Rouzbeh

Hello,

I hope you are all doing well! I am using MG5aMC_3.4.2 and trying to run a process on BSM (p p > VVz , z > l+ l-), in which the V is the DM particle and z is the SM boson. I have a problem with the number of events when I set Mv <100. For instance, if I set 1k, it gives me 3 and the following error:

failed to generate enough events. Please follow one of the following suggestions to fix the issue:

-set in the run_card.dat 'sde_strategy' to 3
-set in the run_card. dat 'hard_survey' to 1 or 2
-reduce the number of requested events (if set too high)
-check that you do not have -integrable- singularity in your amplitude.

I checked the above commands but they did not solve the problem.

Thank you so much for your time and consideration!

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ben foster (foster67) said : 		#1

Reducing event numbers can impact engagement and networking opportunities but may streamline operations and enhance event quality. Careful planning is essential.
<a href="https://speedtest-copel.net.br/
">teste copel</a>

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Olivier Mattelaer (olivier-mattelaer) said : 		#2

Hi,

Well difficult to really comment on this. Is the cross-section reported reasonable (and how precise is the reported cross-section?)
One potential issue is that your portal particle (if you have one) has a zero width that make the computation badly define (and make impossible to generate events correctly (which is a subset of the last point above).

Cheers,

Olivier

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Rouzbeh (rouzbehi) said : 		#3

Thanks Olivier Mattelaer, that solved my question.

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Rouzbeh (rouzbehi) said : 		#4

Hello,

I hope this message finds you well!
I asked about a problem related to a number of events, and your answer was correct about zero width for portal particles.
Now, I have tried to define a width for my portal particle create a UFO format, and insert it in MadGraph.
The new issue is I got this error:
All Mass/Width Parameter should be real (not the case for mdl_wH2).

So my question is can I define a formula for my width or I should define a real number for it?

Sincerely,
Rouzbeh

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