| Geant4 Cross Reference |
1 // 1 //
2 // ******************************************* 2 // ********************************************************************
3 // * License and Disclaimer 3 // * License and Disclaimer *
4 // * 4 // * *
5 // * The Geant4 software is copyright of th 5 // * The Geant4 software is copyright of the Copyright Holders of *
6 // * the Geant4 Collaboration. It is provided 6 // * the Geant4 Collaboration. It is provided under the terms and *
7 // * conditions of the Geant4 Software License 7 // * conditions of the Geant4 Software License, included in the file *
8 // * LICENSE and available at http://cern.ch/ 8 // * LICENSE and available at http://cern.ch/geant4/license . These *
9 // * include a list of copyright holders. 9 // * include a list of copyright holders. *
10 // * 10 // * *
11 // * Neither the authors of this software syst 11 // * Neither the authors of this software system, nor their employing *
12 // * institutes,nor the agencies providing fin 12 // * institutes,nor the agencies providing financial support for this *
13 // * work make any representation or warran 13 // * work make any representation or warranty, express or implied, *
14 // * regarding this software system or assum 14 // * regarding this software system or assume any liability for its *
15 // * use. Please see the license in the file 15 // * use. Please see the license in the file LICENSE and URL above *
16 // * for the full disclaimer and the limitatio 16 // * for the full disclaimer and the limitation of liability. *
17 // * 17 // * *
18 // * This code implementation is the result 18 // * This code implementation is the result of the scientific and *
19 // * technical work of the GEANT4 collaboratio 19 // * technical work of the GEANT4 collaboration. *
20 // * By using, copying, modifying or distri 20 // * By using, copying, modifying or distributing the software (or *
21 // * any work based on the software) you ag 21 // * any work based on the software) you agree to acknowledge its *
22 // * use in resulting scientific publicati 22 // * use in resulting scientific publications, and indicate your *
23 // * acceptance of all terms of the Geant4 Sof 23 // * acceptance of all terms of the Geant4 Software license. *
24 // ******************************************* 24 // ********************************************************************
25 // 25 //
26 // G4DalitzDecayChannel class implementation 26 // G4DalitzDecayChannel class implementation
27 // 27 //
28 // Author: H.Kurashige, 30 May 1997 << 28 // Author: H.Kurashige, 30 May 1997
29 // ------------------------------------------- 29 // --------------------------------------------------------------------
30 30
31 #include "G4DalitzDecayChannel.hh" <<
32 <<
33 #include "G4DecayProducts.hh" <<
34 #include "G4LorentzRotation.hh" <<
35 #include "G4LorentzVector.hh" <<
36 #include "G4ParticleDefinition.hh" <<
37 #include "G4PhaseSpaceDecayChannel.hh" <<
38 #include "G4PhysicalConstants.hh" 31 #include "G4PhysicalConstants.hh"
39 #include "G4SystemOfUnits.hh" 32 #include "G4SystemOfUnits.hh"
>> 33 #include "G4ParticleDefinition.hh"
>> 34 #include "G4DecayProducts.hh"
40 #include "G4VDecayChannel.hh" 35 #include "G4VDecayChannel.hh"
>> 36 #include "G4DalitzDecayChannel.hh"
>> 37 #include "G4PhaseSpaceDecayChannel.hh"
41 #include "Randomize.hh" 38 #include "Randomize.hh"
>> 39 #include "G4LorentzVector.hh"
>> 40 #include "G4LorentzRotation.hh"
42 41
43 G4DalitzDecayChannel::G4DalitzDecayChannel(con << 42 G4DalitzDecayChannel::G4DalitzDecayChannel()
44 con << 43 : G4VDecayChannel()
45 con << 44 {
>> 45 }
>> 46
>> 47 G4DalitzDecayChannel::
>> 48 G4DalitzDecayChannel(const G4String& theParentName,
>> 49 G4double theBR,
>> 50 const G4String& theLeptonName,
>> 51 const G4String& theAntiLeptonName)
46 : G4VDecayChannel("Dalitz Decay", 1) 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) { << 66 }
>> 67
>> 68 G4DalitzDecayChannel::G4DalitzDecayChannel(const G4DalitzDecayChannel& right)
>> 69 : G4VDecayChannel(right)
>> 70 {
>> 71 }
>> 72
>> 73 G4DalitzDecayChannel&
>> 74 G4DalitzDecayChannel::operator=(const G4DalitzDecayChannel& right)
>> 75 {
>> 76 if (this != &right)
>> 77 {
61 kinematics_name = right.kinematics_name; 78 kinematics_name = right.kinematics_name;
62 verboseLevel = right.verboseLevel; 79 verboseLevel = right.verboseLevel;
63 rbranch = right.rbranch; 80 rbranch = right.rbranch;
64 81
65 // copy parent name 82 // copy parent name
66 parent_name = new G4String(*right.parent_n 83 parent_name = new G4String(*right.parent_name);
67 84
68 // clear daughters_name array 85 // clear daughters_name array
69 ClearDaughtersName(); 86 ClearDaughtersName();
70 87
71 // recreate array 88 // recreate array
72 numberOfDaughters = right.numberOfDaughter 89 numberOfDaughters = right.numberOfDaughters;
73 if (numberOfDaughters > 0) { << 90 if ( numberOfDaughters >0 )
>> 91 {
74 if (daughters_name != nullptr) ClearDaug 92 if (daughters_name != nullptr) ClearDaughtersName();
75 daughters_name = new G4String*[numberOfD 93 daughters_name = new G4String*[numberOfDaughters];
76 // copy daughters name << 94 //copy daughters name
77 for (G4int index = 0; index < numberOfDa << 95 for (G4int index=0; index < numberOfDaughters; ++index)
>> 96 {
78 daughters_name[index] = new G4String(* 97 daughters_name[index] = new G4String(*right.daughters_name[index]);
79 } 98 }
80 } 99 }
81 } 100 }
82 return *this; 101 return *this;
83 } 102 }
84 103
85 G4DecayProducts* G4DalitzDecayChannel::DecayIt << 104 G4DecayProducts* G4DalitzDecayChannel::DecayIt(G4double)
86 { 105 {
87 #ifdef G4VERBOSE 106 #ifdef G4VERBOSE
88 if (GetVerboseLevel() > 1) G4cout << "G4Dali << 107 if (GetVerboseLevel()>1) G4cout << "G4DalitzDecayChannel::DecayIt ";
89 #endif << 108 #endif
90 CheckAndFillParent(); 109 CheckAndFillParent();
91 CheckAndFillDaughters(); 110 CheckAndFillDaughters();
92 111
93 // parent mass 112 // parent mass
94 G4double parentmass = G4MT_parent->GetPDGMas 113 G4double parentmass = G4MT_parent->GetPDGMass();
95 << 114
96 // create parent G4DynamicParticle at rest 115 // create parent G4DynamicParticle at rest
97 G4ThreeVector dummy; 116 G4ThreeVector dummy;
98 auto parentparticle = new G4DynamicParticle( << 117 G4DynamicParticle* parentparticle
99 << 118 = new G4DynamicParticle( G4MT_parent, dummy, 0.0);
100 // daughters' mass << 119
101 G4double leptonmass = G4MT_daughters[idLepto << 120 //daughters' mass
102 << 121 G4double leptonmass = G4MT_daughters[idLepton]->GetPDGMass();
103 // Generate t ( = std::exp(x):mass Square of << 122
104 G4double xmin = 2.0 * std::log(2.0 * leptonm << 123 // Generate t ( = std::exp(x):mass Square of (l+ l-) system)
105 G4double xmax = 2.0 * std::log(parentmass); << 124 G4double xmin = 2.0*std::log(2.0*leptonmass);
>> 125 G4double xmax = 2.0*std::log(parentmass);
106 G4double wmax = 1.5; 126 G4double wmax = 1.5;
107 G4double x, w, ww, w1, w2, w3, t; 127 G4double x, w, ww, w1, w2, w3, t;
108 const std::size_t MAX_LOOP = 10000; 128 const std::size_t MAX_LOOP = 10000;
109 for (std::size_t loop_counter = 0; loop_coun << 129 for (std::size_t loop_counter=0; loop_counter<MAX_LOOP; ++loop_counter)
110 x = G4UniformRand() * (xmax - xmin) + xmin << 130 {
111 w = G4UniformRand() * wmax; << 131 x = G4UniformRand()*(xmax-xmin) + xmin;
>> 132 w = G4UniformRand()*wmax;
112 t = std::exp(x); 133 t = std::exp(x);
113 w1 = (1.0 - 4.0 * leptonmass * leptonmass << 134 w1 = (1.0-4.0*leptonmass*leptonmass/t);
114 if (w1 > 0.0) { << 135 if ( w1 > 0.0)
115 w2 = (1.0 + 2.0 * leptonmass * leptonmas << 136 {
116 w3 = (1.0 - t / parentmass / parentmass) << 137 w2 = ( 1.0 + 2.0*leptonmass*leptonmass/t );
>> 138 w3 = ( 1.0 - t/parentmass/parentmass );
117 w3 = w3 * w3 * w3; 139 w3 = w3 * w3 * w3;
118 ww = w3 * w2 * std::sqrt(w1); 140 ww = w3 * w2 * std::sqrt(w1);
119 } 141 }
120 else { << 142 else
>> 143 {
121 ww = 0.0; 144 ww = 0.0;
122 } 145 }
123 if (w <= ww) break; << 146 if (w <= ww) break;
124 } 147 }
125 148
126 // calculate gamma momentum 149 // calculate gamma momentum
127 G4double Pgamma = G4PhaseSpaceDecayChannel:: << 150 G4double Pgamma =
128 G4double costheta = 2. * G4UniformRand() - 1 << 151 G4PhaseSpaceDecayChannel::Pmx(parentmass, 0.0, std::sqrt(t));
129 G4double sintheta = std::sqrt((1.0 - costhet << 152 G4double costheta = 2.*G4UniformRand()-1.0;
130 G4double phi = twopi * G4UniformRand() * rad << 153 G4double sintheta = std::sqrt((1.0 - costheta)*(1.0 + costheta));
131 G4ThreeVector gdirection(sintheta * std::cos << 154 G4double phi = twopi*G4UniformRand()*rad;
132 << 155 G4ThreeVector gdirection(sintheta*std::cos(phi),
133 // create G4DynamicParticle for gamma << 156 sintheta*std::sin(phi),
134 auto gammaparticle = new G4DynamicParticle(G << 157 costheta);
>> 158
>> 159 // create G4DynamicParticle for gamma
>> 160 G4DynamicParticle* gammaparticle
>> 161 = new G4DynamicParticle(G4MT_daughters[idGamma] , gdirection, Pgamma);
135 162
136 // calculate beta of (l+ l-)system 163 // calculate beta of (l+ l-)system
137 G4double beta = Pgamma / (parentmass - Pgamm << 164 G4double beta = Pgamma/(parentmass-Pgamma);
138 165
139 // calculate lepton momentum in the rest fra 166 // calculate lepton momentum in the rest frame of (l+ l-)system
140 G4double Plepton = G4PhaseSpaceDecayChannel: << 167 G4double Plepton =
141 G4double Elepton = std::sqrt(Plepton * Plept << 168 G4PhaseSpaceDecayChannel::Pmx(std::sqrt(t),leptonmass, leptonmass);
142 costheta = 2. * G4UniformRand() - 1.0; << 169 G4double Elepton = std::sqrt(Plepton*Plepton + leptonmass*leptonmass );
143 sintheta = std::sqrt((1.0 - costheta) * (1.0 << 170 costheta = 2.*G4UniformRand()-1.0;
144 phi = twopi * G4UniformRand() * rad; << 171 sintheta = std::sqrt((1.0 - costheta)*(1.0 + costheta));
145 G4ThreeVector ldirection(sintheta * std::cos << 172 phi = twopi*G4UniformRand()*rad;
>> 173 G4ThreeVector ldirection(sintheta*std::cos(phi),
>> 174 sintheta*std::sin(phi),
>> 175 costheta);
146 // create G4DynamicParticle for leptons in 176 // create G4DynamicParticle for leptons in the rest frame of (l+ l-)system
147 auto leptonparticle = << 177 G4DynamicParticle* leptonparticle
148 new G4DynamicParticle(G4MT_daughters[idLep << 178 = new G4DynamicParticle(G4MT_daughters[idLepton] ,
149 auto antileptonparticle = << 179 ldirection, Elepton-leptonmass );
150 new G4DynamicParticle(G4MT_daughters[idAnt << 180 G4DynamicParticle* antileptonparticle
151 // boost leptons in the rest frame of the pa << 181 = new G4DynamicParticle(G4MT_daughters[idAntiLepton] ,
>> 182 -1.0*ldirection, Elepton-leptonmass );
>> 183 //boost leptons in the rest frame of the parent
152 G4LorentzVector p4 = leptonparticle->Get4Mom 184 G4LorentzVector p4 = leptonparticle->Get4Momentum();
153 p4.boost(-1.0 * gdirection.x() * beta, -1.0 << 185 p4.boost( -1.0*gdirection.x()*beta,
154 -1.0 * gdirection.z() * beta); << 186 -1.0*gdirection.y()*beta,
>> 187 -1.0*gdirection.z()*beta);
155 leptonparticle->Set4Momentum(p4); 188 leptonparticle->Set4Momentum(p4);
156 p4 = antileptonparticle->Get4Momentum(); 189 p4 = antileptonparticle->Get4Momentum();
157 p4.boost(-1.0 * gdirection.x() * beta, -1.0 << 190 p4.boost( -1.0*gdirection.x()*beta,
158 -1.0 * gdirection.z() * beta); << 191 -1.0*gdirection.y()*beta,
>> 192 -1.0*gdirection.z()*beta);
159 antileptonparticle->Set4Momentum(p4); 193 antileptonparticle->Set4Momentum(p4);
160 194
161 // create G4Decayproducts << 195 //create G4Decayproducts
162 auto products = new G4DecayProducts(*parentp << 196 G4DecayProducts* products = new G4DecayProducts(*parentparticle);
163 delete parentparticle; 197 delete parentparticle;
164 products->PushProducts(gammaparticle); 198 products->PushProducts(gammaparticle);
165 products->PushProducts(leptonparticle); 199 products->PushProducts(leptonparticle);
166 products->PushProducts(antileptonparticle); 200 products->PushProducts(antileptonparticle);
167 201
168 #ifdef G4VERBOSE 202 #ifdef G4VERBOSE
169 if (GetVerboseLevel() > 1) { << 203 if (GetVerboseLevel()>1)
170 G4cout << "G4DalitzDecayChannel::DecayIt " << 204 {
171 G4cout << " create decay products in rest << 205 G4cout << "G4DalitzDecayChannel::DecayIt ";
172 products->DumpInfo(); << 206 G4cout << " create decay products in rest frame " <<G4endl;
>> 207 products->DumpInfo();
173 } 208 }
174 #endif 209 #endif
175 return products; 210 return products;
176 } 211 }
177 212