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27 // Geant4 Header : G4NeutrinoElectronNcModel 27 // Geant4 Header : G4NeutrinoElectronNcModel
28 // 28 //
29 // Author : V.Grichine 6.4.17 29 // Author : V.Grichine 6.4.17
30 // 30 //
31 31
32 #include "G4NeutrinoElectronNcModel.hh" 32 #include "G4NeutrinoElectronNcModel.hh"
33 #include "G4SystemOfUnits.hh" 33 #include "G4SystemOfUnits.hh"
34 #include "G4ParticleTable.hh" 34 #include "G4ParticleTable.hh"
35 #include "G4ParticleDefinition.hh" 35 #include "G4ParticleDefinition.hh"
36 #include "G4IonTable.hh" 36 #include "G4IonTable.hh"
37 #include "Randomize.hh" 37 #include "Randomize.hh"
38 #include "G4Electron.hh" 38 #include "G4Electron.hh"
39 #include "G4HadronicParameters.hh" 39 #include "G4HadronicParameters.hh"
40 #include "G4PhysicsModelCatalog.hh" 40 #include "G4PhysicsModelCatalog.hh"
41 41
42 using namespace std; 42 using namespace std;
43 using namespace CLHEP; 43 using namespace CLHEP;
44 44
45 G4NeutrinoElectronNcModel::G4NeutrinoElectronN 45 G4NeutrinoElectronNcModel::G4NeutrinoElectronNcModel(const G4String& name)
46 : G4HadronElastic(name) 46 : G4HadronElastic(name)
47 { 47 {
48 secID = G4PhysicsModelCatalog::GetModelID( " 48 secID = G4PhysicsModelCatalog::GetModelID( "model_" + name );
49 49
50 SetMinEnergy( 0.0*GeV ); 50 SetMinEnergy( 0.0*GeV );
51 SetMaxEnergy( G4HadronicParameters::Instance 51 SetMaxEnergy( G4HadronicParameters::Instance()->GetMaxEnergy() );
52 SetLowestEnergyLimit(1.e-6*eV); 52 SetLowestEnergyLimit(1.e-6*eV);
53 53
54 theElectron = G4Electron::Electron(); 54 theElectron = G4Electron::Electron();
55 // PDG2016: sin^2 theta Weinberg 55 // PDG2016: sin^2 theta Weinberg
56 56
57 fSin2tW = 0.23129; // 0.2312; 57 fSin2tW = 0.23129; // 0.2312;
58 58
59 fCutEnergy = 0.; // default value 59 fCutEnergy = 0.; // default value
60 } 60 }
61 61
62 62
63 G4NeutrinoElectronNcModel::~G4NeutrinoElectron 63 G4NeutrinoElectronNcModel::~G4NeutrinoElectronNcModel()
64 {} 64 {}
65 65
>> 66
66 void G4NeutrinoElectronNcModel::ModelDescripti 67 void G4NeutrinoElectronNcModel::ModelDescription(std::ostream& outFile) const
67 { 68 {
68 outFile << "G4NeutrinoElectronNcModel is a n << 69
69 << "model which uses the standard model \n << 70 outFile << "G4NeutrinoElectronNcModel is a neutrino-electron (neutral current) elastic scattering\n"
70 << "transfer parameterization. The model << 71 << "model which uses the standard model \n"
>> 72 << "transfer parameterization. The model is fully relativistic\n";
>> 73
71 } 74 }
72 75
73 ////////////////////////////////////////////// 76 /////////////////////////////////////////////////////////
74 77
75 G4bool G4NeutrinoElectronNcModel::IsApplicable << 78 G4bool G4NeutrinoElectronNcModel::IsApplicable(const G4HadProjectile & aTrack,
>> 79 G4Nucleus & targetNucleus)
76 { 80 {
77 G4bool result = false; 81 G4bool result = false;
78 G4String pName = aTrack.GetDefinition()->Get 82 G4String pName = aTrack.GetDefinition()->GetParticleName();
79 G4double minEnergy = 0.; << 83 G4double minEnergy = 0., energy = aTrack.GetTotalEnergy();
80 G4double energy = aTrack.GetTotalEnergy(); <<
81 84
82 if( fCutEnergy > 0. ) // min detected recoil 85 if( fCutEnergy > 0. ) // min detected recoil electron energy
83 { 86 {
84 minEnergy = 0.5*(fCutEnergy+sqrt(fCutEnerg 87 minEnergy = 0.5*(fCutEnergy+sqrt(fCutEnergy*(fCutEnergy+2.*electron_mass_c2)));
85 } 88 }
86 if( ( pName == "nu_e" || pName == "anti_nu 89 if( ( pName == "nu_e" || pName == "anti_nu_e" ||
87 pName == "nu_mu" || pName == "anti_nu 90 pName == "nu_mu" || pName == "anti_nu_nu" ||
88 pName == "nu_tau" || pName == "anti_nu 91 pName == "nu_tau" || pName == "anti_nu_tau" ) &&
89 energy > minEnergy 92 energy > minEnergy )
90 { 93 {
91 result = true; 94 result = true;
92 } 95 }
>> 96 G4int Z = targetNucleus.GetZ_asInt();
>> 97 Z *= 1;
>> 98
93 return result; 99 return result;
94 } 100 }
95 101
96 ////////////////////////////////////////////// 102 ////////////////////////////////////////////////
97 // 103 //
98 // 104 //
99 105
100 G4HadFinalState* G4NeutrinoElectronNcModel::Ap 106 G4HadFinalState* G4NeutrinoElectronNcModel::ApplyYourself(
101 const G4HadProjectile& aTrack, G4Nucleus& << 107 const G4HadProjectile& aTrack, G4Nucleus& targetNucleus)
102 { 108 {
103 theParticleChange.Clear(); 109 theParticleChange.Clear();
104 110
105 const G4HadProjectile* aParticle = &aTrack; 111 const G4HadProjectile* aParticle = &aTrack;
106 G4double nuTkin = aParticle->GetKineticEnerg 112 G4double nuTkin = aParticle->GetKineticEnergy();
107 113
108 if( nuTkin <= LowestEnergyLimit() ) 114 if( nuTkin <= LowestEnergyLimit() )
109 { 115 {
110 theParticleChange.SetEnergyChange(nuTkin); 116 theParticleChange.SetEnergyChange(nuTkin);
111 theParticleChange.SetMomentumChange(aTrack 117 theParticleChange.SetMomentumChange(aTrack.Get4Momentum().vect().unit());
112 return &theParticleChange; 118 return &theParticleChange;
113 } 119 }
114 // sample and make final state in lab frame 120 // sample and make final state in lab frame
115 121
116 G4double eTkin = SampleElectronTkin( aPartic 122 G4double eTkin = SampleElectronTkin( aParticle );
117 123
118 if( eTkin > fCutEnergy ) 124 if( eTkin > fCutEnergy )
119 { 125 {
120 G4double ePlab = sqrt( eTkin*(eTkin + 2.*e 126 G4double ePlab = sqrt( eTkin*(eTkin + 2.*electron_mass_c2) );
121 127
122 G4double cost2 = eTkin*(nuTkin + electron 128 G4double cost2 = eTkin*(nuTkin + electron_mass_c2)*(nuTkin + electron_mass_c2);
123 cost2 /= nuTkin*nuTkin*(eTkin + 2 129 cost2 /= nuTkin*nuTkin*(eTkin + 2.*electron_mass_c2);
124 130
125 if( cost2 > 1. ) cost2 = 1.; 131 if( cost2 > 1. ) cost2 = 1.;
126 if( cost2 < 0. ) cost2 = 0.; 132 if( cost2 < 0. ) cost2 = 0.;
127 133
128 G4double cost = sqrt(cost2); 134 G4double cost = sqrt(cost2);
129 G4double sint = std::sqrt( (1.0 - cost)*(1 135 G4double sint = std::sqrt( (1.0 - cost)*(1.0 + cost) );
130 G4double phi = G4UniformRand()*CLHEP::two 136 G4double phi = G4UniformRand()*CLHEP::twopi;
131 137
132 G4ThreeVector eP( sint*std::cos(phi), sint 138 G4ThreeVector eP( sint*std::cos(phi), sint*std::sin(phi), cost );
133 eP *= ePlab; 139 eP *= ePlab;
134 G4LorentzVector lvt2( eP, eTkin + electron 140 G4LorentzVector lvt2( eP, eTkin + electron_mass_c2 );
135 G4DynamicParticle * aSec = new G4DynamicPa 141 G4DynamicParticle * aSec = new G4DynamicParticle( theElectron, lvt2 );
136 theParticleChange.AddSecondary( aSec, secI 142 theParticleChange.AddSecondary( aSec, secID );
137 143
138 G4LorentzVector lvp1 = aParticle->Get4Mome 144 G4LorentzVector lvp1 = aParticle->Get4Momentum();
139 G4LorentzVector lvt1(0.,0.,0.,electron_mas 145 G4LorentzVector lvt1(0.,0.,0.,electron_mass_c2);
140 G4LorentzVector lvsum = lvp1+lvt1; 146 G4LorentzVector lvsum = lvp1+lvt1;
141 147
142 G4LorentzVector lvp2 = lvsum-lvt2; 148 G4LorentzVector lvp2 = lvsum-lvt2;
143 G4double nuTkin2 = lvp2.e()-aParticle->Get 149 G4double nuTkin2 = lvp2.e()-aParticle->GetDefinition()->GetPDGMass();
144 theParticleChange.SetEnergyChange(nuTkin2) 150 theParticleChange.SetEnergyChange(nuTkin2);
145 theParticleChange.SetMomentumChange(lvp2.v 151 theParticleChange.SetMomentumChange(lvp2.vect().unit());
146 } 152 }
147 else if( eTkin > 0.0 ) 153 else if( eTkin > 0.0 )
148 { 154 {
149 theParticleChange.SetLocalEnergyDeposit( e 155 theParticleChange.SetLocalEnergyDeposit( eTkin );
150 nuTkin -= eTkin; 156 nuTkin -= eTkin;
151 157
152 if( nuTkin > 0. ) 158 if( nuTkin > 0. )
153 { 159 {
154 theParticleChange.SetEnergyChange( nuTki 160 theParticleChange.SetEnergyChange( nuTkin );
155 theParticleChange.SetMomentumChange( aTr 161 theParticleChange.SetMomentumChange( aTrack.Get4Momentum().vect().unit() );
156 } 162 }
157 } 163 }
158 else 164 else
159 { 165 {
160 theParticleChange.SetEnergyChange( nuTkin 166 theParticleChange.SetEnergyChange( nuTkin );
161 theParticleChange.SetMomentumChange( aTrac 167 theParticleChange.SetMomentumChange( aTrack.Get4Momentum().vect().unit() );
162 } 168 }
>> 169 G4int Z = targetNucleus.GetZ_asInt();
>> 170 Z *= 1;
>> 171
163 return &theParticleChange; 172 return &theParticleChange;
164 } 173 }
165 174
166 ////////////////////////////////////////////// 175 //////////////////////////////////////////////////////
167 // 176 //
168 // sample recoil electron energy in lab frame 177 // sample recoil electron energy in lab frame
169 178
170 G4double G4NeutrinoElectronNcModel::SampleElec 179 G4double G4NeutrinoElectronNcModel::SampleElectronTkin(const G4HadProjectile* aParticle)
171 { 180 {
172 G4double result = 0., xi, cofL, cofR, cofL2, 181 G4double result = 0., xi, cofL, cofR, cofL2, cofR2, cofLR;
173 182
174 G4double energy = aParticle->GetTotalEnergy( 183 G4double energy = aParticle->GetTotalEnergy();
175 if( energy == 0.) return result; // vmg: < t 184 if( energy == 0.) return result; // vmg: < th?? as in xsc
176 185
177 G4String pName = aParticle->GetDefinition() 186 G4String pName = aParticle->GetDefinition()->GetParticleName();
178 187
179 if( pName == "nu_e") 188 if( pName == "nu_e")
180 { 189 {
181 cofL = 0.5 + fSin2tW; 190 cofL = 0.5 + fSin2tW;
182 cofR = fSin2tW; 191 cofR = fSin2tW;
183 } 192 }
184 else if( pName == "anti_nu_e") 193 else if( pName == "anti_nu_e")
185 { 194 {
186 cofL = fSin2tW; 195 cofL = fSin2tW;
187 cofR = 0.5 + fSin2tW; 196 cofR = 0.5 + fSin2tW;
188 } 197 }
189 else if( pName == "nu_mu") 198 else if( pName == "nu_mu")
190 { 199 {
191 cofL = -0.5 + fSin2tW; 200 cofL = -0.5 + fSin2tW;
192 cofR = fSin2tW; 201 cofR = fSin2tW;
193 } 202 }
194 else if( pName == "anti_nu_mu") 203 else if( pName == "anti_nu_mu")
195 { 204 {
196 cofL = fSin2tW; 205 cofL = fSin2tW;
197 cofR = -0.5 + fSin2tW; 206 cofR = -0.5 + fSin2tW;
198 } 207 }
199 else if( pName == "nu_tau") // vmg: nu_tau a 208 else if( pName == "nu_tau") // vmg: nu_tau as nu_mu ???
200 { 209 {
201 cofL = -0.5 + fSin2tW; 210 cofL = -0.5 + fSin2tW;
202 cofR = fSin2tW; 211 cofR = fSin2tW;
203 } 212 }
204 else if( pName == "anti_nu_tau") 213 else if( pName == "anti_nu_tau")
205 { 214 {
206 cofL = fSin2tW; 215 cofL = fSin2tW;
207 cofR = -0.5 + fSin2tW; 216 cofR = -0.5 + fSin2tW;
208 } 217 }
209 else 218 else
210 { 219 {
211 return result; 220 return result;
212 } 221 }
213 xi = 0.5*electron_mass_c2/energy; 222 xi = 0.5*electron_mass_c2/energy;
214 223
215 cofL2 = cofL*cofL; 224 cofL2 = cofL*cofL;
216 cofR2 = cofR*cofR; 225 cofR2 = cofR*cofR;
217 cofLR = cofL*cofR; 226 cofLR = cofL*cofR;
218 227
219 // cofs of Tkin/Enu 3rd equation 228 // cofs of Tkin/Enu 3rd equation
220 229
221 G4double a = cofR2/3.; 230 G4double a = cofR2/3.;
222 G4double b = -(cofR2+cofLR*xi); 231 G4double b = -(cofR2+cofLR*xi);
223 G4double c = cofL2+cofR2; 232 G4double c = cofL2+cofR2;
224 233
225 G4double xMax = 1./(1. + xi); 234 G4double xMax = 1./(1. + xi);
226 G4double xMax2 = xMax*xMax; 235 G4double xMax2 = xMax*xMax;
227 G4double xMax3 = xMax*xMax2; 236 G4double xMax3 = xMax*xMax2;
228 237
229 G4double d = -( a*xMax3 + b*xMax2 + c*xMax 238 G4double d = -( a*xMax3 + b*xMax2 + c*xMax );
230 d *= G4UniformRand(); 239 d *= G4UniformRand();
231 240
232 // G4cout<<a<<" "<<b<<" "<<c<<" "<<d<< 241 // G4cout<<a<<" "<<b<<" "<<c<<" "<<d<<G4endl<<G4endl;
233 242
234 // cofs of the incomplete 3rd equation 243 // cofs of the incomplete 3rd equation
235 244
236 G4double p = c/a; 245 G4double p = c/a;
237 p -= b*b/a/a/3.; 246 p -= b*b/a/a/3.;
238 G4double q = d/a; 247 G4double q = d/a;
239 q -= b*c/a/a/3.; 248 q -= b*c/a/a/3.;
240 q += 2*b*b*b/a/a/a/27.; 249 q += 2*b*b*b/a/a/a/27.;
241 250
242 251
243 // cofs for the incomplete colutions 252 // cofs for the incomplete colutions
244 253
245 G4double D = p*p*p/3./3./3.; 254 G4double D = p*p*p/3./3./3.;
246 D += q*q/2./2.; 255 D += q*q/2./2.;
247 256
248 // G4cout<<"D = "<<D<<G4endl; 257 // G4cout<<"D = "<<D<<G4endl;
249 // D = -D; 258 // D = -D;
250 // G4complex A1 = G4complex(- q/2., std:: 259 // G4complex A1 = G4complex(- q/2., std::sqrt(-D) );
251 // G4complex A = std::pow(A1,1./3.); 260 // G4complex A = std::pow(A1,1./3.);
252 261
253 // G4complex B1 = G4complex(- q/2., -std: 262 // G4complex B1 = G4complex(- q/2., -std::sqrt(-D) );
254 // G4complex B = std::pow(B1,1./3.); 263 // G4complex B = std::pow(B1,1./3.);
255 264
256 G4double A1 = - q/2. + std::sqrt(D); 265 G4double A1 = - q/2. + std::sqrt(D);
257 G4double A = std::pow(A1,1./3.); 266 G4double A = std::pow(A1,1./3.);
258 267
259 G4double B1 = - q/2. - std::sqrt(D); 268 G4double B1 = - q/2. - std::sqrt(D);
260 G4double B = std::pow(-B1,1./3.); 269 G4double B = std::pow(-B1,1./3.);
261 B = -B; 270 B = -B;
262 271
263 // roots of the incomplete 3rd equation 272 // roots of the incomplete 3rd equation
264 273
265 G4complex y1 = A + B; 274 G4complex y1 = A + B;
266 // G4complex y2 = -0.5*(A + B) + 0.5*std::sq 275 // G4complex y2 = -0.5*(A + B) + 0.5*std::sqrt(3.)*(A - B)*G4complex(0.,1.);
267 // G4complex y3 = -0.5*(A + B) - 0.5*std::sq 276 // G4complex y3 = -0.5*(A + B) - 0.5*std::sqrt(3.)*(A - B)*G4complex(0.,1.);
268 277
269 G4complex x1 = y1 - b/a/3.; 278 G4complex x1 = y1 - b/a/3.;
270 // G4complex x2 = y2 - b/a/3.; 279 // G4complex x2 = y2 - b/a/3.;
271 // G4complex x3 = y3 - b/a/3.; 280 // G4complex x3 = y3 - b/a/3.;
272 281
273 // G4cout<<"re_x1 = "<<real(x1)<<"; re_x2 = 282 // G4cout<<"re_x1 = "<<real(x1)<<"; re_x2 = "<<real(x2)<<"; re_x3 = "<<real(x3)<<G4endl;
274 // G4cout<<"im_x1 = "<<imag(x1)<<"; im_x2 = 283 // G4cout<<"im_x1 = "<<imag(x1)<<"; im_x2 = "<<imag(x2)<<"; im_x3 = "<<imag(x3)<<G4endl<<G4endl;
275 284
276 result = real(x1)*energy; 285 result = real(x1)*energy;
277 286
278 return result; 287 return result;
279 } 288 }
280 289
281 // 290 //
282 // 291 //
283 /////////////////////////// 292 ///////////////////////////
284 293