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25 // 25 //
26 // G4TauLeptonicDecayChannel class implementat 26 // G4TauLeptonicDecayChannel class implementation
27 // 27 //
28 // Author: H.Kurashige, 30 May 1997 << 28 // Author: H.Kurashige, 30 May 1997
29 // ------------------------------------------- 29 // --------------------------------------------------------------------
30 30
31 #include "G4TauLeptonicDecayChannel.hh" <<
32 <<
33 #include "G4DecayProducts.hh" <<
34 #include "G4LorentzRotation.hh" <<
35 #include "G4LorentzVector.hh" <<
36 #include "G4ParticleDefinition.hh" 31 #include "G4ParticleDefinition.hh"
37 #include "G4PhysicalConstants.hh" 32 #include "G4PhysicalConstants.hh"
38 #include "G4SystemOfUnits.hh" 33 #include "G4SystemOfUnits.hh"
>> 34 #include "G4DecayProducts.hh"
39 #include "G4VDecayChannel.hh" 35 #include "G4VDecayChannel.hh"
>> 36 #include "G4TauLeptonicDecayChannel.hh"
40 #include "Randomize.hh" 37 #include "Randomize.hh"
>> 38 #include "G4LorentzVector.hh"
>> 39 #include "G4LorentzRotation.hh"
>> 40
41 41
42 G4TauLeptonicDecayChannel::G4TauLeptonicDecayC << 42 G4TauLeptonicDecayChannel::G4TauLeptonicDecayChannel()
43 << 43 : G4VDecayChannel()
>> 44 {
>> 45 }
>> 46
>> 47 // --------------------------------------------------------------------
>> 48 G4TauLeptonicDecayChannel::
>> 49 G4TauLeptonicDecayChannel(const G4String& theParentName,
>> 50 G4double theBR,
>> 51 const G4String& theLeptonName)
44 : G4VDecayChannel("Tau Leptonic Decay", 1) 52 : G4VDecayChannel("Tau Leptonic Decay", 1)
45 { 53 {
46 // set names for daughter particles 54 // set names for daughter particles
47 if (theParentName == "tau+") { << 55 if (theParentName == "tau+")
>> 56 {
48 SetBR(theBR); 57 SetBR(theBR);
49 SetParent("tau+"); 58 SetParent("tau+");
50 SetNumberOfDaughters(3); 59 SetNumberOfDaughters(3);
51 if ((theLeptonName == "e-" || theLeptonNam << 60 if ((theLeptonName=="e-"||theLeptonName=="e+"))
>> 61 {
52 SetDaughter(0, "e+"); 62 SetDaughter(0, "e+");
53 SetDaughter(1, "nu_e"); 63 SetDaughter(1, "nu_e");
54 SetDaughter(2, "anti_nu_tau"); 64 SetDaughter(2, "anti_nu_tau");
55 } 65 }
56 else { << 66 else
>> 67 {
57 SetDaughter(0, "mu+"); 68 SetDaughter(0, "mu+");
58 SetDaughter(1, "nu_mu"); 69 SetDaughter(1, "nu_mu");
59 SetDaughter(2, "anti_nu_tau"); 70 SetDaughter(2, "anti_nu_tau");
60 } << 71 }
61 } 72 }
62 else if (theParentName == "tau-") { << 73 else if (theParentName == "tau-")
>> 74 {
63 SetBR(theBR); 75 SetBR(theBR);
64 SetParent("tau-"); 76 SetParent("tau-");
65 SetNumberOfDaughters(3); 77 SetNumberOfDaughters(3);
66 if ((theLeptonName == "e-" || theLeptonNam << 78 if ((theLeptonName=="e-"||theLeptonName=="e+"))
>> 79 {
67 SetDaughter(0, "e-"); 80 SetDaughter(0, "e-");
68 SetDaughter(1, "anti_nu_e"); 81 SetDaughter(1, "anti_nu_e");
69 SetDaughter(2, "nu_tau"); 82 SetDaughter(2, "nu_tau");
70 } 83 }
71 else { << 84 else
>> 85 {
72 SetDaughter(0, "mu-"); 86 SetDaughter(0, "mu-");
73 SetDaughter(1, "anti_nu_mu"); 87 SetDaughter(1, "anti_nu_mu");
74 SetDaughter(2, "nu_tau"); 88 SetDaughter(2, "nu_tau");
75 } << 89 }
76 } 90 }
77 else { << 91 else
>> 92 {
78 #ifdef G4VERBOSE 93 #ifdef G4VERBOSE
79 if (GetVerboseLevel() > 0) { << 94 if (GetVerboseLevel()>0)
>> 95 {
80 G4cout << "G4TauLeptonicDecayChannel:: c 96 G4cout << "G4TauLeptonicDecayChannel:: constructor :";
81 G4cout << " parent particle is not tau b 97 G4cout << " parent particle is not tau but ";
82 G4cout << theParentName << G4endl; 98 G4cout << theParentName << G4endl;
83 } 99 }
84 #endif 100 #endif
85 } 101 }
86 } 102 }
87 103
>> 104 // --------------------------------------------------------------------
>> 105 G4TauLeptonicDecayChannel::~G4TauLeptonicDecayChannel()
>> 106 {
>> 107 }
>> 108
>> 109 // --------------------------------------------------------------------
>> 110 G4TauLeptonicDecayChannel::
>> 111 G4TauLeptonicDecayChannel(const G4TauLeptonicDecayChannel& right)
>> 112 : G4VDecayChannel(right)
>> 113 {
>> 114 }
>> 115
>> 116 // --------------------------------------------------------------------
88 G4TauLeptonicDecayChannel& 117 G4TauLeptonicDecayChannel&
89 G4TauLeptonicDecayChannel::operator=(const G4T 118 G4TauLeptonicDecayChannel::operator=(const G4TauLeptonicDecayChannel& right)
90 { 119 {
91 if (this != &right) { << 120 if (this != &right)
>> 121 {
92 kinematics_name = right.kinematics_name; 122 kinematics_name = right.kinematics_name;
93 verboseLevel = right.verboseLevel; 123 verboseLevel = right.verboseLevel;
94 rbranch = right.rbranch; 124 rbranch = right.rbranch;
95 125
96 // copy parent name 126 // copy parent name
97 parent_name = new G4String(*right.parent_n 127 parent_name = new G4String(*right.parent_name);
98 128
99 // clear daughters_name array 129 // clear daughters_name array
100 ClearDaughtersName(); 130 ClearDaughtersName();
101 131
102 // recreate array 132 // recreate array
103 numberOfDaughters = right.numberOfDaughter 133 numberOfDaughters = right.numberOfDaughters;
104 if (numberOfDaughters > 0) { << 134 if ( numberOfDaughters >0 )
105 if (daughters_name != nullptr) ClearDaug << 135 {
>> 136 if (daughters_name !=0) ClearDaughtersName();
106 daughters_name = new G4String*[numberOfD 137 daughters_name = new G4String*[numberOfDaughters];
107 // copy daughters name 138 // copy daughters name
108 for (G4int index = 0; index < numberOfDa << 139 for (G4int index=0; index<numberOfDaughters; ++index)
>> 140 {
109 daughters_name[index] = new G4String(* 141 daughters_name[index] = new G4String(*right.daughters_name[index]);
110 } 142 }
111 } 143 }
112 } 144 }
113 return *this; 145 return *this;
114 } 146 }
115 147
116 G4DecayProducts* G4TauLeptonicDecayChannel::De << 148 // --------------------------------------------------------------------
>> 149 G4DecayProducts* G4TauLeptonicDecayChannel::DecayIt(G4double)
117 { 150 {
118 // this version neglects muon polarization << 151 // this version neglects muon polarization
119 // assumes the pure V-A couplin 152 // assumes the pure V-A coupling
120 // gives incorrect energy spect 153 // gives incorrect energy spectrum for neutrinos
121 154
122 #ifdef G4VERBOSE 155 #ifdef G4VERBOSE
123 if (GetVerboseLevel() > 1) G4cout << "G4TauL << 156 if (GetVerboseLevel()>1) G4cout << "G4TauLeptonicDecayChannel::DecayIt()";
124 #endif 157 #endif
125 158
126 CheckAndFillParent(); 159 CheckAndFillParent();
127 CheckAndFillDaughters(); 160 CheckAndFillDaughters();
128 << 161
129 // parent mass 162 // parent mass
130 G4double parentmass = G4MT_parent->GetPDGMas 163 G4double parentmass = G4MT_parent->GetPDGMass();
131 164
132 // daughters'mass 165 // daughters'mass
133 const G4int N_DAUGHTER = 3; << 166 const G4int N_DAUGHTER=3;
134 G4double daughtermass[N_DAUGHTER]; << 167 G4double daughtermass[N_DAUGHTER];
135 for (G4int index = 0; index < N_DAUGHTER; ++ << 168 for (G4int index=0; index<N_DAUGHTER; ++index)
>> 169 {
136 daughtermass[index] = G4MT_daughters[index 170 daughtermass[index] = G4MT_daughters[index]->GetPDGMass();
137 } 171 }
138 172
139 // create parent G4DynamicParticle at rest 173 // create parent G4DynamicParticle at rest
140 G4ThreeVector dummy; 174 G4ThreeVector dummy;
141 auto parentparticle = new G4DynamicParticle( << 175 G4DynamicParticle* parentparticle
>> 176 = new G4DynamicParticle(G4MT_parent, dummy, 0.0);
142 // create G4Decayproducts 177 // create G4Decayproducts
143 auto products = new G4DecayProducts(*parentp << 178 G4DecayProducts* products = new G4DecayProducts(*parentparticle);
144 delete parentparticle; 179 delete parentparticle;
145 180
146 // calculate daughter momentum 181 // calculate daughter momentum
147 G4double daughtermomentum[N_DAUGHTER]; 182 G4double daughtermomentum[N_DAUGHTER];
148 183
149 // calculate lepton momentum 184 // calculate lepton momentum
150 G4double pmax = (parentmass * parentmass - d << 185 G4double pmax = (parentmass*parentmass
>> 186 - daughtermass[0]*daughtermass[0])/2./parentmass;
151 G4double p, e; 187 G4double p, e;
152 G4double r; 188 G4double r;
153 const std::size_t MAX_LOOP = 10000; << 189 const std::size_t MAX_LOOP=10000;
154 for (std::size_t loop_counter = 0; loop_coun << 190 for (std::size_t loop_counter=0; loop_counter<MAX_LOOP; ++loop_counter)
>> 191 {
155 // determine momentum/energy 192 // determine momentum/energy
156 r = G4UniformRand(); 193 r = G4UniformRand();
157 p = pmax * G4UniformRand(); << 194 p = pmax*G4UniformRand();
158 e = std::sqrt(p * p + daughtermass[0] * da << 195 e = std::sqrt(p*p + daughtermass[0]*daughtermass[0]);
159 if (r < spectrum(p, e, parentmass, daughte << 196 if (r < spectrum(p,e,parentmass,daughtermass[0]) ) break;
160 } << 197 }
161 198
162 // create daughter G4DynamicParticle << 199 // create daughter G4DynamicParticle
163 // daughter 0 (lepton) 200 // daughter 0 (lepton)
164 daughtermomentum[0] = p; 201 daughtermomentum[0] = p;
165 G4double costheta, sintheta, phi, sinphi, co << 202 G4double costheta, sintheta, phi, sinphi, cosphi;
166 costheta = 2. * G4UniformRand() - 1.0; << 203 costheta = 2.*G4UniformRand()-1.0;
167 sintheta = std::sqrt((1.0 - costheta) * (1.0 << 204 sintheta = std::sqrt((1.0-costheta)*(1.0+costheta));
168 phi = twopi * G4UniformRand() * rad; << 205 phi = twopi*G4UniformRand()*rad;
169 sinphi = std::sin(phi); 206 sinphi = std::sin(phi);
170 cosphi = std::cos(phi); 207 cosphi = std::cos(phi);
171 G4ThreeVector direction0(sintheta * cosphi, << 208 G4ThreeVector direction0(sintheta*cosphi,sintheta*sinphi,costheta);
172 auto daughterparticle = << 209 G4DynamicParticle * daughterparticle
173 new G4DynamicParticle(G4MT_daughters[0], d << 210 = new G4DynamicParticle(G4MT_daughters[0], direction0*daughtermomentum[0]);
174 products->PushProducts(daughterparticle); 211 products->PushProducts(daughterparticle);
175 212
176 // daughter 1 ,2 (nutrinos) 213 // daughter 1 ,2 (nutrinos)
177 // create neutrinos in the C.M frame of two 214 // create neutrinos in the C.M frame of two neutrinos
178 G4double energy2 = parentmass - e; << 215 G4double energy2 = parentmass-e;
179 G4double vmass = std::sqrt((energy2 - daught << 216 G4double vmass = std::sqrt((energy2-daughtermomentum[0])
180 G4double beta = -1.0 * daughtermomentum[0] / << 217 *(energy2+daughtermomentum[0]));
181 G4double costhetan = 2. * G4UniformRand() - << 218 G4double beta = -1.0*daughtermomentum[0]/energy2;
182 G4double sinthetan = std::sqrt((1.0 - costhe << 219 G4double costhetan = 2.*G4UniformRand()-1.0;
183 G4double phin = twopi * G4UniformRand() * ra << 220 G4double sinthetan = std::sqrt((1.0-costhetan)*(1.0+costhetan));
>> 221 G4double phin = twopi*G4UniformRand()*rad;
184 G4double sinphin = std::sin(phin); 222 G4double sinphin = std::sin(phin);
185 G4double cosphin = std::cos(phin); 223 G4double cosphin = std::cos(phin);
186 224
187 G4ThreeVector direction1(sinthetan * cosphin << 225 G4ThreeVector direction1(sinthetan*cosphin,sinthetan*sinphin,costhetan);
188 auto daughterparticle1 = new G4DynamicPartic << 226 G4DynamicParticle * daughterparticle1
189 auto daughterparticle2 = << 227 = new G4DynamicParticle( G4MT_daughters[1], direction1*(vmass/2.));
190 new G4DynamicParticle(G4MT_daughters[2], d << 228 G4DynamicParticle * daughterparticle2
>> 229 = new G4DynamicParticle( G4MT_daughters[2], direction1*(-1.0*vmass/2.));
191 230
192 // boost to the muon rest frame 231 // boost to the muon rest frame
193 G4LorentzVector p4; 232 G4LorentzVector p4;
194 p4 = daughterparticle1->Get4Momentum(); 233 p4 = daughterparticle1->Get4Momentum();
195 p4.boost(direction0.x() * beta, direction0.y << 234 p4.boost( direction0.x()*beta, direction0.y()*beta, direction0.z()*beta);
196 daughterparticle1->Set4Momentum(p4); 235 daughterparticle1->Set4Momentum(p4);
197 p4 = daughterparticle2->Get4Momentum(); 236 p4 = daughterparticle2->Get4Momentum();
198 p4.boost(direction0.x() * beta, direction0.y << 237 p4.boost( direction0.x()*beta, direction0.y()*beta, direction0.z()*beta);
199 daughterparticle2->Set4Momentum(p4); 238 daughterparticle2->Set4Momentum(p4);
200 products->PushProducts(daughterparticle1); 239 products->PushProducts(daughterparticle1);
201 products->PushProducts(daughterparticle2); 240 products->PushProducts(daughterparticle2);
202 daughtermomentum[1] = daughterparticle1->Get 241 daughtermomentum[1] = daughterparticle1->GetTotalMomentum();
203 daughtermomentum[2] = daughterparticle2->Get 242 daughtermomentum[2] = daughterparticle2->GetTotalMomentum();
204 243
205 // output message 244 // output message
206 #ifdef G4VERBOSE 245 #ifdef G4VERBOSE
207 if (GetVerboseLevel() > 1) { << 246 if (GetVerboseLevel()>1)
>> 247 {
208 G4cout << "G4TauLeptonicDecayChannel::Deca 248 G4cout << "G4TauLeptonicDecayChannel::DecayIt ";
209 G4cout << " create decay products in rest 249 G4cout << " create decay products in rest frame " << G4endl;
210 products->DumpInfo(); 250 products->DumpInfo();
211 } 251 }
212 #endif 252 #endif
213 return products; 253 return products;
214 } 254 }
215 255
216 G4double G4TauLeptonicDecayChannel::spectrum(G << 256 // --------------------------------------------------------------------
>> 257 G4double G4TauLeptonicDecayChannel::spectrum(G4double p,
>> 258 G4double e,
>> 259 G4double mtau,
>> 260 G4double ml)
217 { 261 {
218 G4double f1; 262 G4double f1;
219 f1 = 3.0 * e * (mtau * mtau + ml * ml) - 4.0 << 263 f1 = 3.0*e*(mtau*mtau+ml*ml)-4.0*mtau*e*e-2.0*mtau*ml*ml;
220 return p * (f1) / (mtau * mtau * mtau * mtau << 264 return p*(f1)/(mtau*mtau*mtau*mtau)/(0.6);
221 } 265 }
222 266