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