MadGraph5_aMC@NLO

Error with four leptons production

Asked by apt45

Hi everybody,
I am trying to produce four leptons (e, mu) processes without Z intermediate from p p collisions.

This is the syntax

define totl = l+ l- vl vl~
generate p p > totl totl totl totl / z
output 4leptonsnoz
launch -f

I get the error
Generating 5000 events with run name run_01
survey run_01
INFO: compile directory
compile Source Directory
Using random number seed offset = 21
INFO: Running Survey
Creating Jobs
Working on SubProcesses
INFO: P1_qq_llll
INFO: Idle: 10, Running: 2, Completed: 0 [ current time: 15h43 ]
STOP 1
ERROR DETECTED
STOP 1
ERROR DETECTED
STOP 1
ERROR DETECTED
INFO: Idle: 9, Running: 2, Completed: 1 [ 0.37s ]
STOP 1
ERROR DETECTED
STOP 1
ERROR DETECTED
STOP 1
ERROR DETECTED
STOP 1
ERROR DETECTED
STOP 1
ERROR DETECTED
STOP 1
ERROR DETECTED
STOP 1
ERROR DETECTED
STOP 1
ERROR DETECTED
ERROR DETECTED
INFO: Idle: 0, Running: 0, Completed: 12 [ 2.7s ]
INFO: End survey
refine 5000
Creating Jobs
INFO: Refine results to 5000
INFO: Generating 5000.0 unweigthed events.
Error when reading /u/he/apt45/Desktop/MG5_aMC_v2_4_3/4leptonsnoZ/SubProcesses/P1_qq_llll/G1/results.dat
Command "generate_events run_01 -f" interrupted with error:
ValueError : need more than 5 values to unpack
Please report this bug on https://bugs.launchpad.net/mg5amcnlo
More information is found in '/u/he/apt45/Desktop/MG5_aMC_v2_4_3/4leptonsnoZ/run_01_tag_1_debug.log'.
Please attach this file to your report.

This is the log file http://pastebin.com/qcq8c29t

What is happening?

Thanks,
Francesco

Question information

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Solved by:
Olivier Mattelaer
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Revision history for this message
Olivier Mattelaer (olivier-mattelaer) said : 		#1

Hi,

What is the content of the log file present in:
/u/he/apt45/Desktop/MG5_aMC_v2_4_3/4leptonsnoZ/SubProcesses/P1_qq_llll/G1/

Cheers,

Olivier

Revision history for this message
apt45 (f4s) said : 		#2

STOP 1
 Process in group number 1
 A PDF is used, so alpha_s(MZ) is going to be modified
 Old value of alpha_s from param_card: 0.11799999999999999
  ****************************************

       NNPDFDriver version 1.0.3
   Grid: NNPDF23_lo_as_0130_qed_mem0.grid
  ****************************************
 New value of alpha_s from PDF nn23lo1: 0.13000000000000000
 Define smin to 900.00000000000000
 Define smin to 900.00000000000000
 Define smin to 400.00000000000000
 Grouping of subprocesses not consistent with setcuts.f. Either change your cuts and/or turn grouping of subprocesses off.

ls status:
input_app.txt
results.dat
run1_app.log

Probably is due some wrong cut I impose? Here the runcard (the standard one) http://pastebin.com/bHxUN0Fn

Revision history for this message
Best Olivier Mattelaer (olivier-mattelaer) said : 		#3

Ok the problem is that you have cut on same flavor lepton but the generated code do not make any difference between the flavor (since the code is much more.
So either you remove that cut (be sure that all your divergency are still removed)
either you generate your code with

import model sm-lepton_masses
define totl = l+ l- vl vl~
generate p p > totl totl totl totl / z
output 4leptonsnoz
launch -f

or with
set group_subprocesses False
define totl = l+ l- vl vl~
generate p p > totl totl totl totl / z
output 4leptonsnoz
launch -f

Cheers,

Olivier

Revision history for this message
apt45 (f4s) said : 		#4

Thanks Olivier Mattelaer, that solved my question.