MadGraph5_aMC@NLO

MG5 stuck during process generation

Asked by Amin Aboubrahim

Hi Olivier,

I am running the script:

######################################

import model MSSM_SLHA2-no_b_mass -name
define snu = sve svm sve~ svm~

generate p p > snu snu @0
add process p p > snu snu j @1
add process p p > snu snu j j @2

output snu_pair

######################################

But it gets stuck at this:

INFO: Combined process c c~ > svm svm~ WEIGHTED<=4 with process u u~ > svm svm~ WEIGHTED<=4

Could you please check?

Thank you,
Amin

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Olivier Mattelaer
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Amin Aboubrahim (amin83) said (last edit ): 		#1

UPDATE: I still have MG5 version 2.6.0 installed on my computer so I tried the process there and it works. It seems the issue is in the newer version (v3.1.0).

Revision history for this message
Olivier Mattelaer (olivier-mattelaer) said : 		#2

Hi,

this seems to be a pure python3 related issue.
Using the latest version with python2 does not have such issue.

Cheers,

Olivier

> On 4 Jun 2021, at 10:11, Amin Aboubrahim <email address hidden> wrote:
>
> Question #697368 on MadGraph5_aMC@NLO changed:
> https://answers.launchpad.net/mg5amcnlo/+question/697368
>
> Amin Aboubrahim gave more information on the question:
> UPDATE: I still have MG5 version 2.6.0 installed on my computer so I
> tried the process there and it works. It seems the issue is in the newer
> version.
>
> --
> You received this question notification because you are an answer
> contact for MadGraph5_aMC@NLO.

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Best Olivier Mattelaer (olivier-mattelaer) said : 		#3

And here is the fix for python3:
https://bazaar.launchpad.net/~maddevelopers/mg5amcnlo/LTS_dev/revision/318

Cheers and thanks,

Olivier

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Amin Aboubrahim (amin83) said : 		#4

Thanks Olivier Mattelaer, that solved my question.

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Oliver Reed (jessicaanderson112) said : 		#5

Take a look, for a moment, at the price list for the MG 5 EV on MG’s Irish website. Peruse it carefully enough and you’ll notice that MG defines the 5’s bodystyle as a “crossover SUV”. Now, this is either (a) a typographical error, or – more likely – (b) an attempt by MG to convince customers that this car, utterly undeniably a compact estate, is actually a far more fashionable type of vehicle.

Now, this depresses me somewhat. Not MG’s obvious obfuscation – such things are more or less excusable, in a marketing sense. No, what upsets me is that someone in MG figured that there’s no way in heck nor hell that any self-respecting Irish car buyer is going to lay down cash on a car that’s blatantly an estate. Unless that is, they can be convinced that it’s actually some sort of 4x4 and also trends change in fashion https://styloss.com/ and your favorite vehicle.

Such are the wiles and whims of fashion, and the pressure to keep up with next door’s Qashqai, and two-doors-down’s ID.4. The thing is, I don’t think MG really needed to do this, to tell bare-faced lies about its car in an effort to entice. I think that it could have done as well, if not better, by appealing to that greatest of all Irish urges – getting one upon one’s fellow citizens.