G4EtaPrime.cc

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//
// ----------------------------------------------------------------
//      GEANT 4 class implementation file
//
//      History: first implementation, 8 June 1998 Hisaya Kurashige
// **********************************************************************
//  New impelemenataion as an utility class  M.Asai, 26 July 2004
// ----------------------------------------------------------------------
//      Update mass  (PDG2006)              Oct. 11 2006 H.Kurashige
//      Update width (PDG2023)              Nov.  5 2023 S.Okada
 
#include "G4EtaPrime.hh"
 
#include "G4DecayTable.hh"
#include "G4ParticleTable.hh"
#include "G4PhaseSpaceDecayChannel.hh"
#include "G4String.hh"
#include "G4SystemOfUnits.hh"
#include "G4Types.hh"
#include "G4VDecayChannel.hh"
 
G4EtaPrime* G4EtaPrime::theInstance = nullptr;
 
G4EtaPrime* G4EtaPrime::Definition()
{
  if (theInstance != nullptr) return theInstance;
  const G4String name = "eta_prime";
  // 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,     0.95778*GeV,     0.188*MeV,         0.0,
                    0,              -1,            +1,
                    0,               0,            +1,
              "meson",               0,             0,         331,
                false,          0.0*ns,       nullptr,
                false,     "eta_prime",           331);
    // clang-format on
 
    // create Decay Table
    auto table = new G4DecayTable();
 
    // create decay channels
    auto mode = new G4VDecayChannel*[5];
    // EtaPrime -> eta + pi+ + pi-
    mode[0] = new G4PhaseSpaceDecayChannel("eta_prime", 0.429, 3, "eta", "pi+", "pi-");
    // EtaPrime -> eta + pi0 + pi0
    mode[1] = new G4PhaseSpaceDecayChannel("eta_prime", 0.222, 3, "eta", "pi0", "pi0");
    // EtaPrime -> rho0 + gamma
    mode[2] = new G4PhaseSpaceDecayChannel("eta_prime", 0.291, 2, "rho0", "gamma");
 
    // EtaPrime -> gamma + gamma
    mode[3] = new G4PhaseSpaceDecayChannel("eta_prime", 0.0220, 2, "gamma", "gamma");
 
    // EtaPrime -> omega + gamma
    mode[4] = new G4PhaseSpaceDecayChannel("eta_prime", 0.0275, 2, "omega", "gamma");
 
    for (G4int index = 0; index < 5; index++)
      table->Insert(mode[index]);
    delete[] mode;
 
    anInstance->SetDecayTable(table);
  }
  theInstance = static_cast<G4EtaPrime*>(anInstance);
  return theInstance;
}
 
G4EtaPrime* G4EtaPrime::EtaPrimeDefinition()
{
  return Definition();
}
 
G4EtaPrime* G4EtaPrime::EtaPrime()
{
  return Definition();
}