Py8TauDecayerPhysics.cc

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#include "Py8TauDecayerPhysics.hh"
#include "Py8Decayer.hh"

#include "Geant4/G4ParticleDefinition.hh"
#include "Geant4/G4ProcessManager.hh"
#include "Geant4/G4Decay.hh"
#include "Geant4/G4DecayTable.hh"

// factory
//
#include "Geant4/G4PhysicsConstructorFactory.hh"
//
// register it with contructor factory
//
G4_DECLARE_PHYSCONSTR_FACTORY(Py8TauDecayerPhysics);

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Py8TauDecayerPhysics::Py8TauDecayerPhysics(G4int)
  : G4VPhysicsConstructor("Py8TauDecayerPhysics")
{
}

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Py8TauDecayerPhysics::~Py8TauDecayerPhysics()
{
}

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void Py8TauDecayerPhysics::ConstructParticle()
{
   // Nothing needs to be done here
}

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void Py8TauDecayerPhysics::ConstructProcess()
{

   // Loop over all particles instantiated and add external decayer
   // to all decay processes where there's no decay table, plus tau's

   // Create external decayer for G4Decay process
   // NOTE: The extDecayer will be deleted in G4Decay destructor
   Py8Decayer* extDecayer = new Py8Decayer();

   auto particleIterator=GetParticleIterator();
   particleIterator->reset();
   while ((*particleIterator)())
   {
      G4ParticleDefinition* particle = particleIterator->value();
      G4ProcessManager* pmanager = particle->GetProcessManager();
/*
      if ( verboseLevel > 1 ) {
         G4cout << "Setting ext decayer for: "
                <<  particleIterator->value()->GetParticleName()
                << G4endl;
      }
*/
      G4ProcessVector* processVector = pmanager->GetProcessList();
      for ( size_t i=0; i<processVector->length(); ++i )
      {
         G4Decay* decay = dynamic_cast<G4Decay*>((*processVector)[i]);
         if ( decay )
         {
            // remove native/existing decay table for
            // a) tau's
            // and replace with external decayer
            if ( std::abs(particle->GetPDGEncoding()) == 15 )
            {
               if ( particle->GetDecayTable() )
               {
                  delete particle->GetDecayTable();
                  particle->SetDecayTable(nullptr);
               }
               decay->SetExtDecayer(extDecayer);
            }
            // now set external decayer to all particles
            // that don't yet have a decay table
            if ( !particle->GetDecayTable() )
            {
               decay->SetExtDecayer(extDecayer);
            }
         }
      }
   }

   return;

}

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