SMEFT@NLO, INFO: fail to reach target 10000.

Asked by tom ingebretsen carlson on 2021-05-18

Hi,

I am trying to generate a LO process using SMEFT@NLO but the process fails to reach the number of events, with the error message:
INFO: fail to reach target 10000.

Is there some log file specifying why this happens you could point me to?
Is there any general cases why this happens, such numerical instabilities, infinities or something else?

Thanks!

All best,
Tom

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Olivier Mattelaer (olivier-mattelaer) said :
#1

If your integrand is not finite (even if integrable) then you will not be able to generate events.

Otherwise you should check this paper: 2102.00773
since it fixes issues on our most challenging cases.

Cheers,

Olivier

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tom ingebretsen carlson (makronymen) said :
#2

Thanks a lot!

I'll look into this and might back to you with some further questions.

Cheers,

Tom

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tom ingebretsen carlson (makronymen) said :
#3

Hi,

I have tried setting different t-integration strategies and different sde settings, but it still does not reach 10 000 events. Is there anything else I can try? Or would you think this process is simply not possible to simulate?

Thanks!

All best,

Tom

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Olivier Mattelaer (olivier-mattelaer) said :
#4

Hi,

They are other parameter that you can play with (like hard_survey, ...) but if none of the above works, the most likely reason is indeed that your process has some singularity and that you need cut (or non zero width) to prevent those. If you do have singularity any trick that I can propose will not work as long as such singularity(ies) are not handle correctly.

So do you have apply all the required method to have a finite matrix-element over the full phase-space?

Cheers,

Olivier

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