External Decayers

There is two external decayers available in FairRoot:

• Pythia6 (G3/G4)
  Use Pythia6 as external decayer

  In the simulation macro you need to call:

  fRun->SetPythiadecayer(kTRUE)

  And then in the DecayConfig.C you specify for which particles Pythia should be used as decayeer. See the comments in the DecayConfig.C file.

• User 2(3) body decay (G3/G4)
  user can define the branching ratios and partial decay modes for two and three body particle decays.
  In the simulation macro you need to call:

  fRun->SetUserDecay(kTRUE)

  And then in the UserDecay.C macro you specify for which particles this decayer has to be used and the two/three particle phase space decay mode and branching ratios. (see the UserDecay.C file for an example)