G4JPsi.cc

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//
// ----------------------------------------------------------------------
//      GEANT 4 class implementation file
//
//      Created                 Hisaya Kurashige, 16 June 1997
// **********************************************************************
//  New impelemenataion as an utility class  M.Asai, 26 July 2004
// ----------------------------------------------------------------------
 
#include "G4JPsi.hh"
 
#include "G4ParticleTable.hh"
#include "G4String.hh"
#include "G4SystemOfUnits.hh"
 
G4JPsi* G4JPsi::theInstance = nullptr;
 
G4JPsi* G4JPsi::Definition()
{
  if (theInstance != nullptr) return theInstance;
  const G4String name = "J/psi";
  // search in particle table]
  G4ParticleTable* pTable = G4ParticleTable::GetParticleTable();
  G4ParticleDefinition* anInstance = pTable->FindParticle(name);
  if (anInstance == nullptr) {
    // create particle
    //
    //    Arguments for constructor are as follows
    //               name             mass          width         charge
    //             2*spin           parity  C-conjugation
    //          2*Isospin       2*Isospin3       G-parity
    //               type    lepton number  baryon number   PDG encoding
    //             stable         lifetime    decay table
    //             shortlived      subType    anti_encoding
 
    // clang-format off
   anInstance = new G4ParticleDefinition(
                 name,    3.096916*GeV,    0.0929*MeV,          0.,
                    2,              -1,            -1,
                    0,               0,            -1,
              "meson",               0,             0,         443,
                false,          0.0*ns,          nullptr,
                false,         "J/psi",           443);
    // clang-format on
  }
  theInstance = static_cast<G4JPsi*>(anInstance);
  return theInstance;
}
 
G4JPsi* G4JPsi::JPsiDefinition()
{
  return Definition();
}
 
G4JPsi* G4JPsi::JPsi()
{
  return Definition();
}