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G4Eta.cc
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28 //
29 // ----------------------------------------------------------------------
30 // GEANT 4 class implementation file
31 //
32 // History: first implementation, based on object model of
33 // 4th April 1996, G.Cosmo
34 // H.Kurashige 7 Jul 96
35 // **********************************************************************
36 // New impelemenataion as an utility class M.Asai, 26 July 2004
37 // ----------------------------------------------------------------------
38 // Update mass (PDG2006) Oct. 11 2006 H.Kurashige
39 //
40 
41 #include "G4Eta.hh"
42 #include "G4SystemOfUnits.hh"
43 #include "G4ParticleTable.hh"
44 
46 #include "G4DecayTable.hh"
47 
48 // ######################################################################
49 // ### ETA ###
50 // ######################################################################
51 
53 
55 {
56  if (theInstance !=0) return theInstance;
57  const G4String name = "eta";
58  // search in particle table]
60  G4ParticleDefinition* anInstance = pTable->FindParticle(name);
61  if (anInstance ==0)
62  {
63  // create particle
64  //
65  // Arguments for constructor are as follows
66  // name mass width charge
67  // 2*spin parity C-conjugation
68  // 2*Isospin 2*Isospin3 G-parity
69  // type lepton number baryon number PDG encoding
70  // stable lifetime decay table
71  // shortlived subType anti_encoding
72 
73  anInstance = new G4ParticleDefinition(
74  name, 0.547862*GeV, 1.31*keV, 0.0,
75  0, -1, +1,
76  0, 0, +1,
77  "meson", 0, 0, 221,
78  false, 0.0*ns, NULL,
79  false, "eta", 221);
80  //create Decay Table
81  G4DecayTable* table = new G4DecayTable();
82 
83  // create decay channels
84  G4VDecayChannel** mode = new G4VDecayChannel*[4];
85  // eta -> gamma + gamma
86  mode[0] = new G4PhaseSpaceDecayChannel("eta",0.3942,2,"gamma","gamma");
87  // eta -> pi0 + pi0 + pi0
88  mode[1] = new G4PhaseSpaceDecayChannel("eta",0.3256,3,"pi0","pi0","pi0");
89  // eta -> pi0 + pi+ + pi-
90  mode[2] = new G4PhaseSpaceDecayChannel("eta",0.226,3,"pi0","pi+","pi-");
91  // eta -> gamma + pi+ + pi-
92  mode[3] = new G4PhaseSpaceDecayChannel("eta",0.0468,3,"gamma","pi+","pi-");
93 
94  for (G4int index=0; index <4; index++ ) table->Insert(mode[index]);
95  delete [] mode;
96 
97  anInstance->SetDecayTable(table);
98  }
99  theInstance = reinterpret_cast<G4Eta*>(anInstance);
100  return theInstance;
101 }
102 
104 {
105  return Definition();
106 }
107 
109 {
110  return Definition();
111 }
112