MadGraph5_aMC@NLO

Pythia crashes when running ttbar_2jets

Asked by Huanian Zhang

Hi

I an running the processes below:

generate p p > t t~, (t > b w+, w+ > l+ vl), (t~ > b~ w-, w- > l- vl~)
add process p p > t t~ j, (t > b w+, w+ > l+ vl), (t~ > b~ w-, w- > l- vl~)
add process p p > t t~ j j, (t > b w+, w+ > l+ vl), (t~ > b~ w-, w- > l- vl~)

And I set the run parameters like below:

set ickkw 1
set xqcut 20
set etaj 5
set cut_decay F

And I run it by the command: ./bin/madevent multi_run -f 50

It always gets stuck at Pythia when it finishes several runs. Would you offer me some clue to solve this problem?

Thank you very much.

Huanian

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

Hi,

Without any log file or anything else, this souds difficult to give you any hint.
So could you provide more information?

Cheers,

Olivier

Revision history for this message
Huanian Zhang (fantasyzhn) said : 		#2

Hi,

Here is some information from pythia.log file

     MSTU(11) changed from 6 to 6
     MDCY(C15,1) changed from 1 to 0
     MSEL changed from 1 to 0

 Reading pythia input card
     mstp(61) changed from 2 to 1
     mstp(71) changed from 1 to 1
     mstj(1) changed from 1 to 1
     mstp(81) changed from 1 to 20
     mstu(21) changed from 2 to 1
 Read Qcut = 25.000000000000000
 Set LHAPATH to /data2/fantasyzhn/MadGraph5_v1_5_13/pythia-pgs/src/PDFsets
 Set LHAPATH to /data2/fantasyzhn/MadGraph5_v1_5_13/pythia-pgs/src/PDFsets
 Set LHAPATH to /data2/fantasyzhn/MadGraph5_v1_5_13/pythia-pgs/src/PDFsets
 Set LHAPATH to /data2/fantasyzhn/MadGraph5_v1_5_13/pythia-pgs/src/PDFsets
 Set LHAPATH to /data2/fantasyzhn/MadGraph5_v1_5_13/pythia-pgs/src/PDFsets
 Set LHAPATH to /data2/fantasyzhn/MadGraph5_v1_5_13/pythia-pgs/src/PDFsets
 Set LHAPATH to /data2/fantasyzhn/MadGraph5_v1_5_13/pythia-pgs/src/PDFsets
 Set LHAPATH to /data2/fantasyzhn/MadGraph5_v1_5_13/pythia-pgs/src/PDFsets
 Set LHAPATH to /data2/fantasyzhn/MadGraph5_v1_5_13/pythia-pgs/src/PDFsets
 Set LHAPATH to /data2/fantasyzhn/MadGraph5_v1_5_13/pythia-pgs/src/PDFsets
 Set LHAPATH to /data2/fantasyzhn/MadGraph5_v1_5_13/pythia-pgs/src/PDFsets
 Set LHAPATH to /data2/fantasyzhn/MadGraph5_v1_5_13/pythia-pgs/src/PDFsets
 Set LHAPATH to /data2/fantasyzhn/MadGraph5_v1_5_13/pythia-pgs/src/PDFsets
 Set LHAPATH to /data2/fantasyzhn/MadGraph5_v1_5_13/pythia-pgs/src/PDFsets
 Set LHAPATH to /data2/fantasyzhn/MadGraph5_v1_5_13/pythia-pgs/src/PDFsets
 Set LHAPATH to /data2/fantasyzhn/MadGraph5_v1_5_13/pythia-pgs/src/PDFsets
 Set LHAPATH to /data2/fantasyzhn/MadGraph5_v1_5_13/pythia-pgs/src/PDFsets
 Set LHAPATH to /data2/fantasyzhn/MadGraph5_v1_5_13/pythia-pgs/src/PDFsets
 Set LHAPATH to /data2/fantasyzhn/MadGraph5_v1_5_13/pythia-pgs/src/PDFsets
 Set LHAPATH to /data2/fantasyzhn/MadGraph5_v1_5_13/pythia-pgs/src/PDFsets
 Set LHAPATH to /data2/fantasyzhn/MadGraph5_v1_5_13/pythia-pgs/src/PDFsets
 Set LHAPATH to /data2/fantasyzhn/MadGraph5_v1_5_13/pythia-pgs/src/PDFsets
 Set LHAPATH to /data2/fantasyzhn/MadGraph5_v1_5_13/pythia-pgs/src/PDFsets
 Set LHAPATH to /data2/fantasyzhn/MadGraph5_v1_5_13/pythia-pgs/src/PDFsets
 Set LHAPATH to /data2/fantasyzhn/MadGraph5_v1_5_13/pythia-pgs/src/PDFsets
 Set LHAPATH to /data2/fantasyzhn/MadGraph5_v1_5_13/pythia-pgs/src/PDFsets
 Set LHAPATH to /data2/fantasyzhn/MadGraph5_v1_5_13/pythia-pgs/src/PDFsets
 Set LHAPATH to /data2/fantasyzhn/MadGraph5_v1_5_13/pythia-pgs/src/PDFsets
 Set LHAPATH to /data2/fantasyzhn/MadGraph5_v1_5_13/pythia-pgs/src/PDFsets
 Set LHAPATH to /data2/fantasyzhn/MadGraph5_v1_5_13/pythia-pgs/src/PDFsets
 Set LHAPATH to /data2/fantasyzhn/MadGraph5_v1_5_13/pythia-pgs/src/PDFsets
 Set LHAPATH to /data2/fantasyzhn/MadGraph5_v1_5_13/pythia-pgs/src/PDFsets
 Set LHAPATH to /data2/fantasyzhn/MadGraph5_v1_5_13/pythia-pgs/src/PDFsets
 Set LHAPATH to /data2/fantasyzhn/MadGraph5_v1_5_13/pythia-pgs/src/PDFsets
 Set LHAPATH to /data2/fantasyzhn/MadGraph5_v1_5_13/pythia-pgs/src/PDFsets

Initiating pythia with external process
1****************** PYINIT: initialization of PYTHIA routines *****************
 Reading parameter sminputs 1 132.50700000000001
 Reading parameter sminputs 2 1.16639000000000003E-005
 Reading parameter sminputs 3 0.11799999999999999
 Reading model: sm
     IMSS(21) changed from 0 to 24
 Initializing PYR with random seed 1194
     MSTP(52) changed from 1 to 2
 Found parameter ickkw 1
 Found parameter ktscheme 1
 Running matching with ME ktscheme 1
 Found parameter maxjetflavor 4
 Set nqmatch to 4
     MSTJ(45) changed from 5 to 4
     MSTP(143) changed from 0 to 1
  Failed to read LHEF event information,
  assume end of file has been reached.
 Minimum number of jets in file: 0
 Maximum number of jets in file: 2
  Number of Events Read:: 50000
  Total cross section (pb):: 102.94327441999999
  Process Cross Section (pb)::
    1 0.25112E+02
    2 0.39952E+02
    3 0.37879E+02
 Minimum number of jets allowed: 0
 Maximum number of jets allowed: 2
 IEXCFILE = 0
 jetprocs = T
 IEXCPROC( 0 ) = -2
 IEXCPROC( 1 ) = -2
 IEXCPROC( 2 ) = 0

Thanks.

Huanian

Revision history for this message
Huanian Zhang (fantasyzhn) said : 		#3

Hi

Do you need any more information related to this problem? It always crashes.

Thank you very much.

Revision history for this message
Olivier Mattelaer (olivier-mattelaer) said : 		#4

Hi,

I just release a new version of pythia-pgs.
Could you try with that one?

Does is occur also if you don't use the multi-run option?

Cheers,

Olivier

Revision history for this message
Huanian Zhang (fantasyzhn) said : 		#5

Hi Olivier,

Thank you very much. When I only run by ./bin/generate_events, it seems to work pretty well, but when I use multi_run so far, it still gets crashed.

Huanian

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