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25 // 25 //
26 // G4DalitzDecayChannel class implementation <<
27 // 26 //
28 // Author: H.Kurashige, 30 May 1997 << 27 // $Id: G4DalitzDecayChannel.cc,v 1.9 2009/08/17 14:52:19 kurasige Exp $
29 // ------------------------------------------- << 28 // GEANT4 tag $Name: geant4-09-03-patch-02 $
30 << 29 //
31 #include "G4DalitzDecayChannel.hh" << 30 //
>> 31 // ------------------------------------------------------------
>> 32 // GEANT 4 class header file
>> 33 //
>> 34 // History: first implementation, based on object model of
>> 35 // 30 May 1997 H.Kurashige
>> 36 // ------------------------------------------------------------
32 37
33 #include "G4DecayProducts.hh" <<
34 #include "G4LorentzRotation.hh" <<
35 #include "G4LorentzVector.hh" <<
36 #include "G4ParticleDefinition.hh" 38 #include "G4ParticleDefinition.hh"
37 #include "G4PhaseSpaceDecayChannel.hh" << 39 #include "G4DecayProducts.hh"
38 #include "G4PhysicalConstants.hh" <<
39 #include "G4SystemOfUnits.hh" <<
40 #include "G4VDecayChannel.hh" 40 #include "G4VDecayChannel.hh"
>> 41 #include "G4DalitzDecayChannel.hh"
>> 42 #include "G4PhaseSpaceDecayChannel.hh"
41 #include "Randomize.hh" 43 #include "Randomize.hh"
>> 44 #include "G4LorentzVector.hh"
>> 45 #include "G4LorentzRotation.hh"
42 46
43 G4DalitzDecayChannel::G4DalitzDecayChannel(con << 47 G4DalitzDecayChannel::G4DalitzDecayChannel(
44 con << 48 const G4String& theParentName,
45 con << 49 G4double theBR,
46 : G4VDecayChannel("Dalitz Decay", 1) << 50 const G4String& theLeptonName,
>> 51 const G4String& theAntiLeptonName)
>> 52 :G4VDecayChannel("Dalitz Decay",1)
47 { 53 {
48 // set names for daughter particles 54 // set names for daughter particles
49 SetParent(theParentName); 55 SetParent(theParentName);
50 SetBR(theBR); 56 SetBR(theBR);
51 SetNumberOfDaughters(3); 57 SetNumberOfDaughters(3);
52 G4String gammaName = "gamma"; 58 G4String gammaName = "gamma";
53 SetDaughter(idGamma, gammaName); 59 SetDaughter(idGamma, gammaName);
54 SetDaughter(idLepton, theLeptonName); 60 SetDaughter(idLepton, theLeptonName);
55 SetDaughter(idAntiLepton, theAntiLeptonName) 61 SetDaughter(idAntiLepton, theAntiLeptonName);
56 } 62 }
57 63
58 G4DalitzDecayChannel& G4DalitzDecayChannel::op << 64 G4DalitzDecayChannel::~G4DalitzDecayChannel()
59 { 65 {
60 if (this != &right) { <<
61 kinematics_name = right.kinematics_name; <<
62 verboseLevel = right.verboseLevel; <<
63 rbranch = right.rbranch; <<
64 <<
65 // copy parent name <<
66 parent_name = new G4String(*right.parent_n <<
67 <<
68 // clear daughters_name array <<
69 ClearDaughtersName(); <<
70 <<
71 // recreate array <<
72 numberOfDaughters = right.numberOfDaughter <<
73 if (numberOfDaughters > 0) { <<
74 if (daughters_name != nullptr) ClearDaug <<
75 daughters_name = new G4String*[numberOfD <<
76 // copy daughters name <<
77 for (G4int index = 0; index < numberOfDa <<
78 daughters_name[index] = new G4String(* <<
79 } <<
80 } <<
81 } <<
82 return *this; <<
83 } 66 }
84 67
85 G4DecayProducts* G4DalitzDecayChannel::DecayIt << 68 G4DecayProducts *G4DalitzDecayChannel::DecayIt(G4double)
86 { 69 {
87 #ifdef G4VERBOSE 70 #ifdef G4VERBOSE
88 if (GetVerboseLevel() > 1) G4cout << "G4Dali << 71 if (GetVerboseLevel()>1) G4cout << "G4DalitzDecayChannel::DecayIt ";
89 #endif << 72 #endif
90 CheckAndFillParent(); << 73 if (parent == 0) FillParent();
91 CheckAndFillDaughters(); << 74 if (daughters == 0) FillDaughters();
92 75
93 // parent mass 76 // parent mass
94 G4double parentmass = G4MT_parent->GetPDGMas << 77 G4double parentmass = parent->GetPDGMass();
95 << 78
96 // create parent G4DynamicParticle at rest << 79 //create parent G4DynamicParticle at rest
97 G4ThreeVector dummy; 80 G4ThreeVector dummy;
98 auto parentparticle = new G4DynamicParticle( << 81 G4DynamicParticle * parentparticle = new G4DynamicParticle( parent, dummy, 0.0);
99 << 82
100 // daughters' mass << 83 //daughters'mass
101 G4double leptonmass = G4MT_daughters[idLepto << 84 G4double leptonmass = daughters[idLepton]->GetPDGMass();
102 << 85
103 // Generate t ( = std::exp(x):mass Square of << 86 // Generate t ( = std::exp(x):mass Square of (l+ l-) system)
104 G4double xmin = 2.0 * std::log(2.0 * leptonm << 87 G4double xmin = 2.0*std::log(2.0*leptonmass);
105 G4double xmax = 2.0 * std::log(parentmass); << 88 G4double xmax = 2.0*std::log(parentmass);
106 G4double wmax = 1.5; 89 G4double wmax = 1.5;
107 G4double x, w, ww, w1, w2, w3, t; 90 G4double x, w, ww, w1, w2, w3, t;
108 const std::size_t MAX_LOOP = 10000; << 91 do {
109 for (std::size_t loop_counter = 0; loop_coun << 92 x = G4UniformRand()*(xmax-xmin) + xmin;
110 x = G4UniformRand() * (xmax - xmin) + xmin << 93 w = G4UniformRand()*wmax;
111 w = G4UniformRand() * wmax; <<
112 t = std::exp(x); 94 t = std::exp(x);
113 w1 = (1.0 - 4.0 * leptonmass * leptonmass << 95 w1 = (1.0-4.0*leptonmass*leptonmass/t);
114 if (w1 > 0.0) { << 96 if ( w1 > 0.0) {
115 w2 = (1.0 + 2.0 * leptonmass * leptonmas << 97 w2 = ( 1.0 + 2.0*leptonmass*leptonmass/t );
116 w3 = (1.0 - t / parentmass / parentmass) << 98 w3 = ( 1.0 - t/parentmass/parentmass );
117 w3 = w3 * w3 * w3; 99 w3 = w3 * w3 * w3;
118 ww = w3 * w2 * std::sqrt(w1); 100 ww = w3 * w2 * std::sqrt(w1);
119 } << 101 } else {
120 else { <<
121 ww = 0.0; 102 ww = 0.0;
122 } 103 }
123 if (w <= ww) break; << 104 } while (w > ww);
124 } << 105
125 <<
126 // calculate gamma momentum 106 // calculate gamma momentum
127 G4double Pgamma = G4PhaseSpaceDecayChannel:: << 107 G4double Pgamma =
128 G4double costheta = 2. * G4UniformRand() - 1 << 108 G4PhaseSpaceDecayChannel::Pmx(parentmass, 0.0, std::sqrt(t));
129 G4double sintheta = std::sqrt((1.0 - costhet << 109 G4double costheta = 2.*G4UniformRand()-1.0;
130 G4double phi = twopi * G4UniformRand() * rad << 110 G4double sintheta = std::sqrt((1.0 - costheta)*(1.0 + costheta));
131 G4ThreeVector gdirection(sintheta * std::cos << 111 G4double phi = twopi*G4UniformRand()*rad;
132 << 112 G4ThreeVector gdirection(sintheta*std::cos(phi),sintheta*std::sin(phi),costheta);
133 // create G4DynamicParticle for gamma << 113
134 auto gammaparticle = new G4DynamicParticle(G << 114 //create G4DynamicParticle for gamma
>> 115 G4DynamicParticle * gammaparticle
>> 116 = new G4DynamicParticle(daughters[idGamma] , gdirection, Pgamma);
135 117
136 // calculate beta of (l+ l-)system << 118 // calcurate beta of (l+ l-)system
137 G4double beta = Pgamma / (parentmass - Pgamm << 119 G4double beta = Pgamma/(parentmass-Pgamma);
138 120
139 // calculate lepton momentum in the rest fra 121 // calculate lepton momentum in the rest frame of (l+ l-)system
140 G4double Plepton = G4PhaseSpaceDecayChannel: << 122 G4double Plepton =
141 G4double Elepton = std::sqrt(Plepton * Plept << 123 G4PhaseSpaceDecayChannel::Pmx(std::sqrt(t),leptonmass, leptonmass);
142 costheta = 2. * G4UniformRand() - 1.0; << 124 G4double Elepton = std::sqrt(Plepton*Plepton + leptonmass*leptonmass );
143 sintheta = std::sqrt((1.0 - costheta) * (1.0 << 125 costheta = 2.*G4UniformRand()-1.0;
144 phi = twopi * G4UniformRand() * rad; << 126 sintheta = std::sqrt((1.0 - costheta)*(1.0 + costheta));
145 G4ThreeVector ldirection(sintheta * std::cos << 127 phi = twopi*G4UniformRand()*rad;
146 // create G4DynamicParticle for leptons in << 128 G4ThreeVector ldirection(sintheta*std::cos(phi),sintheta*std::sin(phi),costheta);
147 auto leptonparticle = << 129 //create G4DynamicParticle for leptons in the rest frame of (l+ l-)system
148 new G4DynamicParticle(G4MT_daughters[idLep << 130 G4DynamicParticle * leptonparticle
149 auto antileptonparticle = << 131 = new G4DynamicParticle(daughters[idLepton] ,
150 new G4DynamicParticle(G4MT_daughters[idAnt << 132 ldirection, Elepton-leptonmass );
151 // boost leptons in the rest frame of the pa << 133 G4DynamicParticle * antileptonparticle
>> 134 = new G4DynamicParticle(daughters[idAntiLepton] ,
>> 135 -1.0*ldirection, Elepton-leptonmass );
>> 136 //boost leptons in the rest frame of the parent
152 G4LorentzVector p4 = leptonparticle->Get4Mom 137 G4LorentzVector p4 = leptonparticle->Get4Momentum();
153 p4.boost(-1.0 * gdirection.x() * beta, -1.0 << 138 p4.boost( -1.0*gdirection.x()*beta, -1.0*gdirection.y()*beta, -1.0*gdirection.z()*beta);
154 -1.0 * gdirection.z() * beta); <<
155 leptonparticle->Set4Momentum(p4); 139 leptonparticle->Set4Momentum(p4);
156 p4 = antileptonparticle->Get4Momentum(); 140 p4 = antileptonparticle->Get4Momentum();
157 p4.boost(-1.0 * gdirection.x() * beta, -1.0 << 141 p4.boost( -1.0*gdirection.x()*beta, -1.0*gdirection.y()*beta, -1.0*gdirection.z()*beta);
158 -1.0 * gdirection.z() * beta); <<
159 antileptonparticle->Set4Momentum(p4); 142 antileptonparticle->Set4Momentum(p4);
160 143
161 // create G4Decayproducts << 144 //create G4Decayproducts
162 auto products = new G4DecayProducts(*parentp << 145 G4DecayProducts *products = new G4DecayProducts(*parentparticle);
163 delete parentparticle; 146 delete parentparticle;
164 products->PushProducts(gammaparticle); 147 products->PushProducts(gammaparticle);
165 products->PushProducts(leptonparticle); 148 products->PushProducts(leptonparticle);
166 products->PushProducts(antileptonparticle); 149 products->PushProducts(antileptonparticle);
167 150
168 #ifdef G4VERBOSE 151 #ifdef G4VERBOSE
169 if (GetVerboseLevel() > 1) { << 152 if (GetVerboseLevel()>1) {
170 G4cout << "G4DalitzDecayChannel::DecayIt " << 153 G4cout << "G4DalitzDecayChannel::DecayIt ";
171 G4cout << " create decay products in rest << 154 G4cout << " create decay products in rest frame " <<G4endl;
172 products->DumpInfo(); << 155 products->DumpInfo();
173 } 156 }
174 #endif 157 #endif
175 return products; 158 return products;
176 } 159 }
>> 160
>> 161
>> 162
>> 163
>> 164
177 165