MadGraph5_aMC@NLO

Error when generating qcd multijets

Asked by Estefania Coluccio Leskow

Hello,
Im trying to generate the following processes with pgs:
pp>j
pp>jj
pp>jjj

and, when doing so, I get the following error message:

Command "generate_events " interrupted in sub-command:
"generate_events" with error:
ValueError : need more than 1 value to unpack

I noticed that if I only generate the last two processes I don t get the error. Im using the MLM matching scheme, with the following cuts :
 ptj=0
drjj=0.001
xqcut=20

Thank you so much in advance,
Estefania.

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Estefania Coluccio Leskow
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Olivier Mattelaer (olivier-mattelaer) said : 		#1

Hi Estefania,

p p > j

doesn't make sense, indeed the three particles are massless and therefore you can not find a way to conserve energy-momenta (and having onshell relation at the same time).

on my computer, I even have:
./ajob1: line 4: 28571 Segmentation fault: 11 ../madevent > $k < input_app.txt
showing that indeed, it's not possible to integrate.

Cheers,

Olivier

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Estefania Coluccio Leskow (ecolucciol) said : 		#2

Hi Oliver,
Yes, I realised that after asking you, thanks so much!
Estefania.