Model that returns an erroneous hepmc file

You need to update Pythia8. I am not a Py8 expert but I heard that they had a bug which sounds similar to your bug report. They have release a fix for it as far as I known.

Cheers,

Olivier

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________________________________
From: <email address hidden> <email address hidden> on behalf of Özer Özdal <email address hidden>
Sent: Wednesday, August 14, 2019 11:02:38 PM
To: Olivier Mattelaer <email address hidden>
Subject: [Question #682903]: Model that returns an erroneous hepmc file

New question #682903 on MadGraph5_aMC@NLO:
https://answers.launchpad.net/mg5amcnlo/+question/682903

Hi,

I ran into an issue with Alternative Left-Right Symmetric Model (ALRM) when I try to generate two d primes. I generated p p > dp dp~ in MadGraph (v2_6_4) and use Pythia8 for showering. Even though I generate 100 events, the accepted number of events are only 3, and the error messages are given in the following:

 -------- End LHA initialization information --------
 PYTHIA Error in Pythia::check: unknown particle code , i = 117, id = 6000302
 PYTHIA Error in Pythia::check: charge not conserved
 PYTHIA Error in Pythia::next: check of event revealed problems
 PYTHIA Warning in StringFragmentation::fragmentToJunction: bad convergence junction rest frame
 PYTHIA Error in StringFragmentation::fragment: stuck in joining
 PYTHIA Error in Pythia::next: hadronLevel failed; try again
 PYTHIA Abort from Pythia::next: parton+hadronLevel failed; giving up
 PYTHIA Error in BeamRemnants::checkColours: q/qbar/g has wrong colour slots set
 PYTHIA Warning in BeamRemnants::add: colour tracing failed; will try again
 PYTHIA Error in BeamRemnants::add: colour tracing failed after several attempts
 PYTHIA Warning in SimpleSpaceShower::pT2nextQCD: weight above unity

.............

 *------- PYTHIA Error and Warning Messages Statistics ----------------------------------------------------------*
 | |
 | times message |
 | |
 | 97 Abort from Pythia::next: parton+hadronLevel failed; giving up |
 | 5 Error in BeamRemnants::add: colour tracing failed after several attempts |
 | 50 Error in BeamRemnants::checkColours: q/qbar/g has wrong colour slots set |
 | 640 Error in Pythia::check: charge not conserved |
 | 1778 Error in Pythia::check: unknown particle code |
 | 976 Error in Pythia::next: check of event revealed problems |
 | 9 Error in Pythia::next: hadronLevel failed; try again |
 | 9 Error in StringFragmentation::fragment: stuck in joining |
 | 2 Info from SLHAinterface::initSLHA: No MODSEL found, keeping internal SUSY switched off |
 | 2 Info from SLHAinterface::initSLHA: importing MASS entries |
 | 50 Warning in BeamRemnants::add: colour tracing failed; will try again |
 | 2 Warning in SLHAinterface::initSLHA: ignoring DECAY tables |
 | 2 Warning in SLHAinterface::initSLHA: ignoring MASS entries |
 | 23 Warning in SLHAinterface::initSLHA: ignoring QNUMBERS |
 | 2 Warning in SLHAinterface::initSLHA: ignoring empty DECAY tables |
 | 1 Warning in SLHAinterface::initSLHA: using QNUMBERS for id codes < 1000000 may clash with SM. |
 | 1 Warning in SimpleSpaceShower::pT2nextQCD: weight above unity |
 | 5 Warning in StringFragmentation::fragmentToJunction: bad convergence junction rest frame |
 | |
 *------- End PYTHIA Error and Warning Messages Statistics ------------------------------------------------------*

Then, I generated p p > t t~ to see if I get the same error or not. No problem for p p > t t~
I get the same result when I run ./run_shower.sh for p p > dp dp~
I think the issue is about rho meson structure in Pythia8 bu I couldn't fix it so far. Any help would be appreciated.

Thanks,
Ozer

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