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G4TauMinus.cc
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27 // $Id: G4TauMinus.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 "G4TauMinus.hh"
41 #include "G4PhysicalConstants.hh"
42 #include "G4SystemOfUnits.hh"
43 #include "G4ParticleTable.hh"
44 
47 #include "G4DecayTable.hh"
48 
49 // ######################################################################
50 // ### TAUMINUS ###
51 // ######################################################################
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 
81  // Bohr Magnetron
82  G4double muB = -0.5*eplus*hbar_Planck/(anInstance->GetPDGMass()/c_squared) ;
83 
84  anInstance->SetPDGMagneticMoment( muB * 1.00118);
85 
86  //create Decay Table
87  G4DecayTable* table = new G4DecayTable();
88 
89  // create decay channels
90  G4VDecayChannel* mode;
91  // tau- -> mu- + anti_nu_mu + nu_tau
92  mode = new G4TauLeptonicDecayChannel("tau-",0.1736,"mu-");
93  table->Insert(mode);
94  // tau- -> e- + anti_nu_e + nu_tau
95  mode = new G4TauLeptonicDecayChannel("tau-",0.1784,"e-");
96  table->Insert(mode);
97  // tau- -> pi- + nu_tau
98  mode = new G4PhaseSpaceDecayChannel("tau-",0.1106,2,"pi-","nu_tau");
99  table->Insert(mode);
100  // tau- -> pi0 + pi- + nu_tau
101  mode = new G4PhaseSpaceDecayChannel("tau-",0.2541,3,"pi0","pi-","nu_tau");
102  table->Insert(mode);
103  // tau- -> pi0 + pi0 + pi- + nu_tau
104  mode = new G4PhaseSpaceDecayChannel();
105  mode->SetParent("tau-");
106  mode->SetBR(0.0917);
107  mode->SetNumberOfDaughters(4);
108  mode->SetDaughter(0,"pi0");
109  mode->SetDaughter(1,"pi0");
110  mode->SetDaughter(2,"pi-");
111  mode->SetDaughter(3,"nu_tau");
112  table->Insert(mode);
113  // tau- -> pi- + pi- + pi+ + nu_tau
114  mode = new G4PhaseSpaceDecayChannel();
115  mode->SetParent("tau-");
116  mode->SetBR(0.0946);
117  mode->SetNumberOfDaughters(4);
118  mode->SetDaughter(0,"pi-");
119  mode->SetDaughter(1,"pi-");
120  mode->SetDaughter(2,"pi+");
121  mode->SetDaughter(3,"nu_tau");
122  table->Insert(mode);
123 
124  anInstance->SetDecayTable(table);
125  }
126  theInstance = reinterpret_cast<G4TauMinus*>(anInstance);
127  return theInstance;
128 }
129 
131 {
132  return Definition();
133 }
134 
136 {
137  return Definition();
138 }
139 
140 
G4ParticleDefinition * FindParticle(G4int PDGEncoding)
const XML_Char * name
Definition: expat.h:151
static G4TauMinus * Definition()
Definition: G4TauMinus.cc:54
static constexpr double hbar_Planck
static G4ParticleTable * GetParticleTable()
static constexpr double MeV
Definition: G4SIunits.hh:214
void SetDecayTable(G4DecayTable *aDecayTable)
void Insert(G4VDecayChannel *aChannel)
Definition: G4DecayTable.cc:62
G4double GetPDGMass() const
static constexpr double c_squared
void SetBR(G4double value)
double G4double
Definition: G4Types.hh:76
static G4TauMinus * theInstance
Definition: G4TauMinus.hh:53
static G4TauMinus * TauMinusDefinition()
Definition: G4TauMinus.cc:130
void SetNumberOfDaughters(G4int value)
void SetParent(const G4ParticleDefinition *particle_type)
static constexpr double eplus
Definition: G4SIunits.hh:199
static G4TauMinus * TauMinus()
Definition: G4TauMinus.cc:135
void SetPDGMagneticMoment(G4double mageticMoment)
static constexpr double GeV
Definition: G4SIunits.hh:217
#define ns
Definition: xmlparse.cc:614
void SetDaughter(G4int anIndex, const G4ParticleDefinition *particle_type)