Problem in showering with e p collider

Asked by Sanjoy Mandal on 2017-12-17

Hi,

I am using a model SM_HeavyN_NLO from feynrules model data base. I am trying to shower the process
e- p > j n1, (n1 > l- j j) using pythia8 switch on. I generated 10,000 no of events, but pythi8 is only generating around 4,000 events after showering. I also tried external pythia8230 package with unweighted_events.lhe for showering. But there also I am not getting all the shower events. I am also attaching the last few lines of tag_1_pythia8.log,

*------- PYTHIA Event and Cross Section Statistics -------------------------------------------------------------*
 | |
 | Subprocess Code | Number of events | sigma +- delta |
 | | Tried Selected Accepted | (estimated) (mb) |
 | | | |
 |-----------------------------------------------------------------------------------------------------------------|
 | | | |
 | Les Houches User Process(es) 9999 | 2500 2500 1076 | 2.780e-07 3.162e-09 |
 | ... whereof user classification code 1 | 2500 2500 1076 | |
 | | | |
 | sum | 2500 2500 1076 | 2.780e-07 3.162e-09 |
 | |
 *------- End PYTHIA Event and Cross Section Statistics ----------------------------------------------------------*

 *------- PYTHIA Error and Warning Messages Statistics ----------------------------------------------------------*
 | |
 | times message |
 | |
 | 1424 Abort from Pythia::next: parton+hadronLevel failed; giving up |
 | 14240 Error in Pythia::next: partonLevel failed; try again |
 | 1 Error in RopeFragPars::init: failed to insert defaults. |
 | 2 Info from SLHAinterface::initSLHA: No MODSEL found, keeping internal SUSY switched off |
 | 2 Info from SLHAinterface::initSLHA: importing MASS entries |
 | 2 Warning in SLHAinterface::initSLHA: ignoring DECAY tables |
 | 2 Warning in SLHAinterface::initSLHA: ignoring MASS entries |
 | 6 Warning in SLHAinterface::initSLHA: ignoring QNUMBERS |
 | 2 Warning in SLHAinterface::initSLHA: ignoring empty DECAY tables |
 | 2 Warning in SLHAinterface::initSLHA: massless particle forced stable |
 | 142400 Warning in SpaceShower::branch: used up beam momentum; retrying parton level |
 | 3 Warning in SpaceShower::pT2nextQCD: weight above unity |
 | |
 *------- End PYTHIA Error and Warning Messages Statistics ------------------------------------------------------*

 Contribution of sample 0 to the inclusive cross section : 2.77771552e-07 +- 8.46801522e-09

Inclusive cross section: 2.77771552e-07 +- 8.46801522e-09 mb

Thanks,
Sanjoy Mandal
The institute of Mathematical Sciences
Chennai, India

Question information

Language:
English Edit question
Status:
Answered
For:
MadGraph5_aMC@NLO Edit question
Assignee:
No assignee Edit question
Last query:
2017-12-17
Last reply:
2017-12-17

Hi,

Please contact py8 author about this.
Do not hesitate to indicate to us their answer since it can be usefull for us to learn if this is a wrong configuration on how PY8 is called. (In which case we would be interested by modifying such configuration automatically)

Cheers,

Olivier

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