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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 << 27 // 26 // 28 // Author: H.Kurashige, 30 May 1997 << 27 // $Id: G4DalitzDecayChannel.cc 67971 2013-03-13 10:13:24Z gcosmo $ 29 // ------------------------------------------- << 28 // 30 << 29 // 31 #include "G4DalitzDecayChannel.hh" << 30 // ------------------------------------------------------------ >> 31 // GEANT 4 class header file >> 32 // >> 33 // History: first implementation, based on object model of >> 34 // 30 May 1997 H.Kurashige >> 35 // ------------------------------------------------------------ 32 36 33 #include "G4DecayProducts.hh" << 34 #include "G4LorentzRotation.hh" << 35 #include "G4LorentzVector.hh" << 36 #include "G4ParticleDefinition.hh" << 37 #include "G4PhaseSpaceDecayChannel.hh" << 38 #include "G4PhysicalConstants.hh" 37 #include "G4PhysicalConstants.hh" 39 #include "G4SystemOfUnits.hh" 38 #include "G4SystemOfUnits.hh" >> 39 #include "G4ParticleDefinition.hh" >> 40 #include "G4DecayProducts.hh" 40 #include "G4VDecayChannel.hh" 41 #include "G4VDecayChannel.hh" >> 42 #include "G4DalitzDecayChannel.hh" >> 43 #include "G4PhaseSpaceDecayChannel.hh" 41 #include "Randomize.hh" 44 #include "Randomize.hh" >> 45 #include "G4LorentzVector.hh" >> 46 #include "G4LorentzRotation.hh" 42 47 43 G4DalitzDecayChannel::G4DalitzDecayChannel(con << 48 G4DalitzDecayChannel::G4DalitzDecayChannel() 44 con << 49 :G4VDecayChannel() 45 con << 50 { 46 : G4VDecayChannel("Dalitz Decay", 1) << 51 } >> 52 >> 53 G4DalitzDecayChannel::G4DalitzDecayChannel( >> 54 const G4String& theParentName, >> 55 G4double theBR, >> 56 const G4String& theLeptonName, >> 57 const G4String& theAntiLeptonName) >> 58 :G4VDecayChannel("Dalitz Decay",1) 47 { 59 { 48 // set names for daughter particles 60 // set names for daughter particles 49 SetParent(theParentName); 61 SetParent(theParentName); 50 SetBR(theBR); 62 SetBR(theBR); 51 SetNumberOfDaughters(3); 63 SetNumberOfDaughters(3); 52 G4String gammaName = "gamma"; 64 G4String gammaName = "gamma"; 53 SetDaughter(idGamma, gammaName); 65 SetDaughter(idGamma, gammaName); 54 SetDaughter(idLepton, theLeptonName); 66 SetDaughter(idLepton, theLeptonName); 55 SetDaughter(idAntiLepton, theAntiLeptonName) 67 SetDaughter(idAntiLepton, theAntiLeptonName); 56 } 68 } 57 69 58 G4DalitzDecayChannel& G4DalitzDecayChannel::op << 70 G4DalitzDecayChannel::~G4DalitzDecayChannel() 59 { 71 { 60 if (this != &right) { << 72 } >> 73 >> 74 G4DalitzDecayChannel::G4DalitzDecayChannel(const G4DalitzDecayChannel &right): >> 75 G4VDecayChannel(right) >> 76 { >> 77 } >> 78 >> 79 G4DalitzDecayChannel & G4DalitzDecayChannel::operator=(const G4DalitzDecayChannel & right) >> 80 { >> 81 if (this != &right) { 61 kinematics_name = right.kinematics_name; 82 kinematics_name = right.kinematics_name; 62 verboseLevel = right.verboseLevel; 83 verboseLevel = right.verboseLevel; 63 rbranch = right.rbranch; 84 rbranch = right.rbranch; 64 85 65 // copy parent name 86 // copy parent name 66 parent_name = new G4String(*right.parent_n 87 parent_name = new G4String(*right.parent_name); 67 88 68 // clear daughters_name array 89 // clear daughters_name array 69 ClearDaughtersName(); 90 ClearDaughtersName(); 70 91 71 // recreate array 92 // recreate array 72 numberOfDaughters = right.numberOfDaughter 93 numberOfDaughters = right.numberOfDaughters; 73 if (numberOfDaughters > 0) { << 94 if ( numberOfDaughters >0 ) { 74 if (daughters_name != nullptr) ClearDaug << 95 if (daughters_name !=0) ClearDaughtersName(); 75 daughters_name = new G4String*[numberOfD 96 daughters_name = new G4String*[numberOfDaughters]; 76 // copy daughters name << 97 //copy daughters name 77 for (G4int index = 0; index < numberOfDa << 98 for (G4int index=0; index < numberOfDaughters; index++) { 78 daughters_name[index] = new G4String(* << 99 daughters_name[index] = new G4String(*right.daughters_name[index]); 79 } 100 } 80 } 101 } 81 } 102 } 82 return *this; 103 return *this; 83 } 104 } 84 105 85 G4DecayProducts* G4DalitzDecayChannel::DecayIt << 106 G4DecayProducts *G4DalitzDecayChannel::DecayIt(G4double) 86 { 107 { 87 #ifdef G4VERBOSE 108 #ifdef G4VERBOSE 88 if (GetVerboseLevel() > 1) G4cout << "G4Dali << 109 if (GetVerboseLevel()>1) G4cout << "G4DalitzDecayChannel::DecayIt "; 89 #endif << 110 #endif 90 CheckAndFillParent(); << 111 if (G4MT_parent == 0) FillParent(); 91 CheckAndFillDaughters(); << 112 if (G4MT_daughters == 0) FillDaughters(); 92 113 93 // parent mass 114 // parent mass 94 G4double parentmass = G4MT_parent->GetPDGMas 115 G4double parentmass = G4MT_parent->GetPDGMass(); 95 << 116 96 // create parent G4DynamicParticle at rest << 117 //create parent G4DynamicParticle at rest 97 G4ThreeVector dummy; 118 G4ThreeVector dummy; 98 auto parentparticle = new G4DynamicParticle( << 119 G4DynamicParticle * parentparticle = new G4DynamicParticle( G4MT_parent, dummy, 0.0); 99 << 120 100 // daughters' mass << 121 //daughters'mass 101 G4double leptonmass = G4MT_daughters[idLepto << 122 G4double leptonmass = G4MT_daughters[idLepton]->GetPDGMass(); 102 << 123 103 // Generate t ( = std::exp(x):mass Square of << 124 // Generate t ( = std::exp(x):mass Square of (l+ l-) system) 104 G4double xmin = 2.0 * std::log(2.0 * leptonm << 125 G4double xmin = 2.0*std::log(2.0*leptonmass); 105 G4double xmax = 2.0 * std::log(parentmass); << 126 G4double xmax = 2.0*std::log(parentmass); 106 G4double wmax = 1.5; 127 G4double wmax = 1.5; 107 G4double x, w, ww, w1, w2, w3, t; 128 G4double x, w, ww, w1, w2, w3, t; 108 const std::size_t MAX_LOOP = 10000; << 129 do { 109 for (std::size_t loop_counter = 0; loop_coun << 130 x = G4UniformRand()*(xmax-xmin) + xmin; 110 x = G4UniformRand() * (xmax - xmin) + xmin << 131 w = G4UniformRand()*wmax; 111 w = G4UniformRand() * wmax; << 112 t = std::exp(x); 132 t = std::exp(x); 113 w1 = (1.0 - 4.0 * leptonmass * leptonmass << 133 w1 = (1.0-4.0*leptonmass*leptonmass/t); 114 if (w1 > 0.0) { << 134 if ( w1 > 0.0) { 115 w2 = (1.0 + 2.0 * leptonmass * leptonmas << 135 w2 = ( 1.0 + 2.0*leptonmass*leptonmass/t ); 116 w3 = (1.0 - t / parentmass / parentmass) << 136 w3 = ( 1.0 - t/parentmass/parentmass ); 117 w3 = w3 * w3 * w3; 137 w3 = w3 * w3 * w3; 118 ww = w3 * w2 * std::sqrt(w1); 138 ww = w3 * w2 * std::sqrt(w1); 119 } << 139 } else { 120 else { << 121 ww = 0.0; 140 ww = 0.0; 122 } 141 } 123 if (w <= ww) break; << 142 } while (w > ww); 124 } << 143 125 << 126 // calculate gamma momentum 144 // calculate gamma momentum 127 G4double Pgamma = G4PhaseSpaceDecayChannel:: << 145 G4double Pgamma = 128 G4double costheta = 2. * G4UniformRand() - 1 << 146 G4PhaseSpaceDecayChannel::Pmx(parentmass, 0.0, std::sqrt(t)); 129 G4double sintheta = std::sqrt((1.0 - costhet << 147 G4double costheta = 2.*G4UniformRand()-1.0; 130 G4double phi = twopi * G4UniformRand() * rad << 148 G4double sintheta = std::sqrt((1.0 - costheta)*(1.0 + costheta)); 131 G4ThreeVector gdirection(sintheta * std::cos << 149 G4double phi = twopi*G4UniformRand()*rad; >> 150 G4ThreeVector gdirection(sintheta*std::cos(phi),sintheta*std::sin(phi),costheta); >> 151 >> 152 //create G4DynamicParticle for gamma >> 153 G4DynamicParticle * gammaparticle >> 154 = new G4DynamicParticle(G4MT_daughters[idGamma] , gdirection, Pgamma); 132 155 133 // create G4DynamicParticle for gamma << 156 // calcurate beta of (l+ l-)system 134 auto gammaparticle = new G4DynamicParticle(G << 157 G4double beta = Pgamma/(parentmass-Pgamma); 135 << 136 // calculate beta of (l+ l-)system << 137 G4double beta = Pgamma / (parentmass - Pgamm << 138 158 139 // calculate lepton momentum in the rest fra 159 // calculate lepton momentum in the rest frame of (l+ l-)system 140 G4double Plepton = G4PhaseSpaceDecayChannel: << 160 G4double Plepton = 141 G4double Elepton = std::sqrt(Plepton * Plept << 161 G4PhaseSpaceDecayChannel::Pmx(std::sqrt(t),leptonmass, leptonmass); 142 costheta = 2. * G4UniformRand() - 1.0; << 162 G4double Elepton = std::sqrt(Plepton*Plepton + leptonmass*leptonmass ); 143 sintheta = std::sqrt((1.0 - costheta) * (1.0 << 163 costheta = 2.*G4UniformRand()-1.0; 144 phi = twopi * G4UniformRand() * rad; << 164 sintheta = std::sqrt((1.0 - costheta)*(1.0 + costheta)); 145 G4ThreeVector ldirection(sintheta * std::cos << 165 phi = twopi*G4UniformRand()*rad; 146 // create G4DynamicParticle for leptons in << 166 G4ThreeVector ldirection(sintheta*std::cos(phi),sintheta*std::sin(phi),costheta); 147 auto leptonparticle = << 167 //create G4DynamicParticle for leptons in the rest frame of (l+ l-)system 148 new G4DynamicParticle(G4MT_daughters[idLep << 168 G4DynamicParticle * leptonparticle 149 auto antileptonparticle = << 169 = new G4DynamicParticle(G4MT_daughters[idLepton] , 150 new G4DynamicParticle(G4MT_daughters[idAnt << 170 ldirection, Elepton-leptonmass ); 151 // boost leptons in the rest frame of the pa << 171 G4DynamicParticle * antileptonparticle >> 172 = new G4DynamicParticle(G4MT_daughters[idAntiLepton] , >> 173 -1.0*ldirection, Elepton-leptonmass ); >> 174 //boost leptons in the rest frame of the parent 152 G4LorentzVector p4 = leptonparticle->Get4Mom 175 G4LorentzVector p4 = leptonparticle->Get4Momentum(); 153 p4.boost(-1.0 * gdirection.x() * beta, -1.0 << 176 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); 177 leptonparticle->Set4Momentum(p4); 156 p4 = antileptonparticle->Get4Momentum(); 178 p4 = antileptonparticle->Get4Momentum(); 157 p4.boost(-1.0 * gdirection.x() * beta, -1.0 << 179 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); 180 antileptonparticle->Set4Momentum(p4); 160 181 161 // create G4Decayproducts << 182 //create G4Decayproducts 162 auto products = new G4DecayProducts(*parentp << 183 G4DecayProducts *products = new G4DecayProducts(*parentparticle); 163 delete parentparticle; 184 delete parentparticle; 164 products->PushProducts(gammaparticle); 185 products->PushProducts(gammaparticle); 165 products->PushProducts(leptonparticle); 186 products->PushProducts(leptonparticle); 166 products->PushProducts(antileptonparticle); 187 products->PushProducts(antileptonparticle); 167 188 168 #ifdef G4VERBOSE 189 #ifdef G4VERBOSE 169 if (GetVerboseLevel() > 1) { << 190 if (GetVerboseLevel()>1) { 170 G4cout << "G4DalitzDecayChannel::DecayIt " << 191 G4cout << "G4DalitzDecayChannel::DecayIt "; 171 G4cout << " create decay products in rest << 192 G4cout << " create decay products in rest frame " <<G4endl; 172 products->DumpInfo(); << 193 products->DumpInfo(); 173 } 194 } 174 #endif 195 #endif 175 return products; 196 return products; 176 } 197 } >> 198 >> 199 >> 200 >> 201 >> 202 177 203