| Geant4 Cross Reference |
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24 // ********************************************************************
25 //
26 // ----------------------------------------------------------------
27 // GEANT 4 class implementation file
28 //
29 // History: first implementation, 8 June 1998 Hisaya Kurashige
30 // **********************************************************************
31 // New impelemenataion as an utility class M.Asai, 26 July 2004
32 // ----------------------------------------------------------------------
33 // Update mass (PDG2006) Oct. 11 2006 H.Kurashige
34 // Update width (PDG2023) Nov. 5 2023 S.Okada
35
36 #include "G4EtaPrime.hh"
37
38 #include "G4DecayTable.hh"
39 #include "G4ParticleTable.hh"
40 #include "G4PhaseSpaceDecayChannel.hh"
41 #include "G4String.hh"
42 #include "G4SystemOfUnits.hh"
43 #include "G4Types.hh"
44 #include "G4VDecayChannel.hh"
45
46 G4EtaPrime* G4EtaPrime::theInstance = nullptr;
47
48 G4EtaPrime* G4EtaPrime::Definition()
49 {
50 if (theInstance != nullptr) return theInstance;
51 const G4String name = "eta_prime";
52 // search in particle table]
53 G4ParticleTable* pTable = G4ParticleTable::GetParticleTable();
54 G4ParticleDefinition* anInstance = pTable->FindParticle(name);
55 if (anInstance == nullptr) {
56 // create particle
57 //
58 // Arguments for constructor are as follows
59 // name mass width charge
60 // 2*spin parity C-conjugation
61 // 2*Isospin 2*Isospin3 G-parity
62 // type lepton number baryon number PDG encoding
63 // stable lifetime decay table
64 // shortlived subType anti_encoding
65
66 // clang-format off
67 anInstance = new G4ParticleDefinition(
68 name, 0.95778*GeV, 0.188*MeV, 0.0,
69 0, -1, +1,
70 0, 0, +1,
71 "meson", 0, 0, 331,
72 false, 0.0*ns, nullptr,
73 false, "eta_prime", 331);
74 // clang-format on
75
76 // create Decay Table
77 auto table = new G4DecayTable();
78
79 // create decay channels
80 auto mode = new G4VDecayChannel*[5];
81 // EtaPrime -> eta + pi+ + pi-
82 mode[0] = new G4PhaseSpaceDecayChannel("eta_prime", 0.429, 3, "eta", "pi+", "pi-");
83 // EtaPrime -> eta + pi0 + pi0
84 mode[1] = new G4PhaseSpaceDecayChannel("eta_prime", 0.222, 3, "eta", "pi0", "pi0");
85 // EtaPrime -> rho0 + gamma
86 mode[2] = new G4PhaseSpaceDecayChannel("eta_prime", 0.291, 2, "rho0", "gamma");
87
88 // EtaPrime -> gamma + gamma
89 mode[3] = new G4PhaseSpaceDecayChannel("eta_prime", 0.0220, 2, "gamma", "gamma");
90
91 // EtaPrime -> omega + gamma
92 mode[4] = new G4PhaseSpaceDecayChannel("eta_prime", 0.0275, 2, "omega", "gamma");
93
94 for (G4int index = 0; index < 5; index++)
95 table->Insert(mode[index]);
96 delete[] mode;
97
98 anInstance->SetDecayTable(table);
99 }
100 theInstance = static_cast<G4EtaPrime*>(anInstance);
101 return theInstance;
102 }
103
104 G4EtaPrime* G4EtaPrime::EtaPrimeDefinition()
105 {
106 return Definition();
107 }
108
109 G4EtaPrime* G4EtaPrime::EtaPrime()
110 {
111 return Definition();
112 }
113