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G4TauPlus.cc
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27 // $Id: G4TauPlus.cc 95951 2016-03-03 10:44:16Z gcosmo $
28 //
29 //
30 // ----------------------------------------------------------------------
31 // GEANT 4 class implementation file
32 //
33 // History: first implementation, based on object model of
34 // 4th April 1996, G.Cosmo
35 // 7 July 1996 H.Kurashige
36 // **********************************************************************
37 // New impelemenataion as an utility class M.Asai, 26 July 2004
38 // ----------------------------------------------------------------------
39 
40 #include "G4TauPlus.hh"
41 #include "G4PhysicalConstants.hh"
42 #include "G4SystemOfUnits.hh"
43 #include "G4ParticleTable.hh"
44 
47 #include "G4DecayTable.hh"
48 
49 // ######################################################################
50 // ### TAPLUS ###
51 // ######################################################################
52 G4TauPlus* G4TauPlus::theInstance = 0;
53 
55 {
56  if (theInstance !=0) return theInstance;
57  const G4String name = "tau+";
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  anInstance = new G4ParticleDefinition(
73  name, 1.77686*GeV, 2.267e-9*MeV, 1.*eplus,
74  1, 0, 0,
75  0, 0, 0,
76  "lepton", -1, 0, -15,
77  false, 290.3e-6*ns, NULL,
78  false, "tau"
79  );
80  // Bohr Magnetron
81  G4double muB = 0.5*eplus*hbar_Planck/(anInstance->GetPDGMass()/c_squared) ;
82 
83  anInstance->SetPDGMagneticMoment( muB * 1.00118);
84 
85  //create Decay Table
86  G4DecayTable* table = new G4DecayTable();
87 
88  // create decay channels
89  G4VDecayChannel* mode;
90  // tau+ -> mu+ + nu_mu + anti_nu_tau
91  mode = new G4TauLeptonicDecayChannel("tau+",0.1736,"mu+");
92  table->Insert(mode);
93  // tau+ -> e+ + nu_e + anti_nu_tau
94  mode = new G4TauLeptonicDecayChannel("tau+",0.1784,"e+");
95  table->Insert(mode);
96  // tau+ -> pi+ + anti_nu_tau
97  mode = new G4PhaseSpaceDecayChannel("tau+",0.1106,2,"pi+","anti_nu_tau");
98  table->Insert(mode);
99  // tau+ -> pi0 + pi0 + pi+ + anti_nu_tau
100  mode = new G4PhaseSpaceDecayChannel("tau+",0.2541,3,"pi0","pi+","anti_nu_tau");
101  table->Insert(mode);
102  // tau+ -> pi0 + pi0 + pi+ + anti_nu_tau
103  mode = new G4PhaseSpaceDecayChannel();
104  mode->SetParent("tau+");
105  mode->SetBR(0.0917);
106  mode->SetNumberOfDaughters(4);
107  mode->SetDaughter(0,"pi0");
108  mode->SetDaughter(1,"pi0");
109  mode->SetDaughter(2,"pi+");
110  mode->SetDaughter(3,"anti_nu_tau");
111  table->Insert(mode);
112  // tau+ -> pi+ + pi+ + pi- + anti_nu_tau
113  mode = new G4PhaseSpaceDecayChannel();
114  mode->SetParent("tau+");
115  mode->SetBR(0.0946);
116  mode->SetNumberOfDaughters(4);
117  mode->SetDaughter(0,"pi+");
118  mode->SetDaughter(1,"pi+");
119  mode->SetDaughter(2,"pi-");
120  mode->SetDaughter(3,"anti_nu_tau");
121  table->Insert(mode);
122 
123  anInstance->SetDecayTable(table);
124  }
125  theInstance = reinterpret_cast<G4TauPlus*>(anInstance);
126  return theInstance;
127 }
128 
130 {
131  return Definition();
132 }
133 
135 {
136  return Definition();
137 }
138 
void SetDecayTable(G4DecayTable *aDecayTable)
const XML_Char * name
Definition: expat.h:151
G4ParticleDefinition * FindParticle(G4int PDGEncoding)
void SetBR(G4double value)
static G4TauPlus * TauPlus()
Definition: G4TauPlus.cc:134
static G4TauPlus * Definition()
Definition: G4TauPlus.cc:54
void SetNumberOfDaughters(G4int value)
static constexpr double eplus
Definition: G4SIunits.hh:199
static G4TauPlus * TauPlusDefinition()
Definition: G4TauPlus.cc:129
void Insert(G4VDecayChannel *aChannel)
Definition: G4DecayTable.cc:60
G4double GetPDGMass() const
static G4ParticleTable * GetParticleTable()
void SetParent(const G4ParticleDefinition *particle_type)
void SetDaughter(G4int anIndex, const G4ParticleDefinition *particle_type)
static constexpr double GeV
Definition: G4SIunits.hh:217
static constexpr double MeV
Definition: G4SIunits.hh:214
double G4double
Definition: G4Types.hh:76
#define ns
Definition: xmlparse.cc:614
void SetPDGMagneticMoment(G4double mageticMoment)