How to simulate new particle in GSTAR
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An example of how to add one particular particle specie is given in "How to simulate D mesons" page. Here one can find some additional information on how to choose new particle ID. In fact one should remember for proper transmission of hep id from event generators, that only the hep Id is meaningfull.

The existing list is below:

In rough order of multiplicity: gamma,pi+,pi-,pi0,etc.

Particle Data Group IDs

 
     22  GAMMA     211  PION +   -211 PION -        111   PION 0       130 KAON 0 LONG
   321 KAON +  -321 KAON -      310 KAON 0 SHORT        221   ETA                 
 2212  PROTON   2112  NEUTRON -2212 ANTIPROTON    -2112  ANTINEUTRON     -11 ELECTRON
      11  POSITRON     -12  NU_E         12 ANTI NU_E         -13  MUON +        13 MUON -
  3122  LAMBDA   3222  SIGMA +     3212 SIGMA 0        3112  SIGMA -    3322 XI 0
  3312  XI -   3334  OMEGA -                                                             
-3122  ANTILAMBDA -3222  ANTISIGMA -  -3212 ANTISIGMA 0     -3112 ANTISIGMA + -3322 ANTIXI 0
-3312  ANTIXI + -3334  ANTIOMEGA +                                                    
     -15  TAU+         15  TAU-        441 D+       -441  D-     421 D0
   -421  ANTID0       431  DS+     -431 DS-                                     
        24  W+      -24  W-           23 Z0        -14  NU_M       14 ANTINU_M
     -16  NU_T         16  ANTINU_T           71 GEANT           72  GEANT       75 GEANT
700201  DEUTERON 700301 TRITON 700202 ALPHA 700302  HE3

It's been agreed some tome ago to use 700000+A*100+Z for atoms, but apart from this there is no conventions.

It is recommended to use something which is consistent with PYTHIA manual. For example it has pdg codes 80-100 reserved for "non-standard" particles or whatever you find logical.

Once a pdg code is selected, one have to put it in local copy of gstar_part.g with a geant code and decay table.