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26 26
27 27
28 #include "G4NeutrinoElectronNcXsc.hh" 28 #include "G4NeutrinoElectronNcXsc.hh"
29 #include "G4PhysicalConstants.hh" 29 #include "G4PhysicalConstants.hh"
30 #include "G4SystemOfUnits.hh" 30 #include "G4SystemOfUnits.hh"
31 #include "G4DynamicParticle.hh" 31 #include "G4DynamicParticle.hh"
32 #include "G4ParticleTable.hh" 32 #include "G4ParticleTable.hh"
33 #include "G4IonTable.hh" 33 #include "G4IonTable.hh"
34 #include "G4HadTmpUtil.hh" 34 #include "G4HadTmpUtil.hh"
35 #include "G4Proton.hh" 35 #include "G4Proton.hh"
36 #include "G4NistManager.hh" 36 #include "G4NistManager.hh"
37 37
38 using namespace std; 38 using namespace std;
39 using namespace CLHEP; 39 using namespace CLHEP;
40 40
41 G4NeutrinoElectronNcXsc::G4NeutrinoElectronNcX 41 G4NeutrinoElectronNcXsc::G4NeutrinoElectronNcXsc()
42 : G4VCrossSectionDataSet("NuElectronNcXsc") 42 : G4VCrossSectionDataSet("NuElectronNcXsc")
43 { 43 {
44 // PDG2016: Gf=1.1663787(6)e-5*(hc)^3/GeV^2 44 // PDG2016: Gf=1.1663787(6)e-5*(hc)^3/GeV^2
45 // fCofXsc = Gf*Gf*MeC2*2/pi 45 // fCofXsc = Gf*Gf*MeC2*2/pi
46 46
47 fCofXsc = 1.36044e-22; 47 fCofXsc = 1.36044e-22;
48 fCofXsc *= hbarc*hbarc*electron_mass_c2; 48 fCofXsc *= hbarc*hbarc*electron_mass_c2;
49 fCofXsc /= halfpi; 49 fCofXsc /= halfpi;
50 50
51 // G4cout<<"hbarc = "<<hbarc/MeV/fermi<<" Me 51 // G4cout<<"hbarc = "<<hbarc/MeV/fermi<<" MeV*fermi"<<G4endl;
52 52
53 // PDG2016: sin^2 theta Weinberg 53 // PDG2016: sin^2 theta Weinberg
54 54
55 fSin2tW = 0.23129; // 0.2312; 55 fSin2tW = 0.23129; // 0.2312;
56 56
57 fCutEnergy = 0.; // default value 57 fCutEnergy = 0.; // default value
58 fBiasingFactor = 1.; 58 fBiasingFactor = 1.;
59 } 59 }
60 60
61 G4NeutrinoElectronNcXsc::~G4NeutrinoElectronNc 61 G4NeutrinoElectronNcXsc::~G4NeutrinoElectronNcXsc()
62 {} 62 {}
63 63
64 ////////////////////////////////////////////// 64 //////////////////////////////////////////////////////
65 65
66 G4bool 66 G4bool
67 G4NeutrinoElectronNcXsc::IsElementApplicable( 67 G4NeutrinoElectronNcXsc::IsElementApplicable( const G4DynamicParticle* aPart, G4int, const G4Material*)
68 { 68 {
69 G4bool result = false; 69 G4bool result = false;
70 G4String pName = aPart->GetDefinition()->Get 70 G4String pName = aPart->GetDefinition()->GetParticleName();
71 G4double minEnergy = 0., energy = aPart->Get 71 G4double minEnergy = 0., energy = aPart->GetTotalEnergy();
72 // Z *= 1; 72 // Z *= 1;
73 if( fCutEnergy > 0. ) // min detected recoil 73 if( fCutEnergy > 0. ) // min detected recoil electron energy
74 { 74 {
75 minEnergy = 0.5*(fCutEnergy+sqrt(fCutEnerg 75 minEnergy = 0.5*(fCutEnergy+sqrt(fCutEnergy*(fCutEnergy+2.*electron_mass_c2)));
76 } 76 }
77 if( ( pName == "nu_e" || pName == "anti_nu 77 if( ( pName == "nu_e" || pName == "anti_nu_e" ||
78 pName == "nu_mu" || pName == "anti_nu 78 pName == "nu_mu" || pName == "anti_nu_mu" ||
79 pName == "nu_tau" || pName == "anti_nu 79 pName == "nu_tau" || pName == "anti_nu_tau" ) &&
80 energy > minEnergy 80 energy > minEnergy )
81 { 81 {
82 result = true; 82 result = true;
83 } 83 }
84 return result; 84 return result;
85 } 85 }
86 86
87 ////////////////////////////////////////////// 87 ////////////////////////////////////////////////////
88 88
89 G4double G4NeutrinoElectronNcXsc:: 89 G4double G4NeutrinoElectronNcXsc::
90 GetElementCrossSection(const G4DynamicParticle 90 GetElementCrossSection(const G4DynamicParticle* aPart, G4int ZZ,
91 const G4Material*) 91 const G4Material*)
92 { 92 {
93 G4double result = 0., cofL, cofR, cofL2, cof 93 G4double result = 0., cofL, cofR, cofL2, cofR2, cofLR;
94 94
95 G4double energy = aPart->GetTotalEnergy(); 95 G4double energy = aPart->GetTotalEnergy();
96 G4String pName = aPart->GetDefinition()->G 96 G4String pName = aPart->GetDefinition()->GetParticleName();
97 97
98 if( pName == "nu_e") 98 if( pName == "nu_e")
99 { 99 {
100 cofL = 0.5 + fSin2tW; 100 cofL = 0.5 + fSin2tW;
101 cofR = fSin2tW; 101 cofR = fSin2tW;
102 } 102 }
103 else if( pName == "anti_nu_e") 103 else if( pName == "anti_nu_e")
104 { 104 {
105 cofL = fSin2tW; 105 cofL = fSin2tW;
106 cofR = 0.5 + fSin2tW; 106 cofR = 0.5 + fSin2tW;
107 } 107 }
108 else if( pName == "nu_mu") 108 else if( pName == "nu_mu")
109 { 109 {
110 cofL = -0.5 + fSin2tW; 110 cofL = -0.5 + fSin2tW;
111 cofR = fSin2tW; 111 cofR = fSin2tW;
112 } 112 }
113 else if( pName == "anti_nu_mu") 113 else if( pName == "anti_nu_mu")
114 { 114 {
115 cofL = fSin2tW; 115 cofL = fSin2tW;
116 cofR = -0.5 + fSin2tW; 116 cofR = -0.5 + fSin2tW;
117 } 117 }
118 else if( pName == "nu_tau") // vmg: nu_tau a 118 else if( pName == "nu_tau") // vmg: nu_tau as nu_mu ???
119 { 119 {
120 cofL = -0.5 + fSin2tW; 120 cofL = -0.5 + fSin2tW;
121 cofR = fSin2tW; 121 cofR = fSin2tW;
122 } 122 }
123 else if( pName == "anti_nu_tau") 123 else if( pName == "anti_nu_tau")
124 { 124 {
125 cofL = fSin2tW; 125 cofL = fSin2tW;
126 cofR = -0.5 + fSin2tW; 126 cofR = -0.5 + fSin2tW;
127 } 127 }
128 else 128 else
129 { 129 {
130 return result; 130 return result;
131 } 131 }
132 // if( energy <= electron_mass_c2 ) return r 132 // if( energy <= electron_mass_c2 ) return result;
133 133
134 cofL2 = cofL*cofL; 134 cofL2 = cofL*cofL;
135 cofR2 = cofR*cofR; 135 cofR2 = cofR*cofR;
136 cofLR = cofL*cofR; 136 cofLR = cofL*cofR;
137 137
138 if( fCutEnergy > 0. ) 138 if( fCutEnergy > 0. )
139 { 139 {
140 G4double tM = 2.*energy*energy/(electron_ 140 G4double tM = 2.*energy*energy/(electron_mass_c2 + 2.*energy);
141 G4double tM2 = tM*tM; 141 G4double tM2 = tM*tM;
142 G4double tM3 = tM*tM2; 142 G4double tM3 = tM*tM2;
143 G4double tC = fCutEnergy; 143 G4double tC = fCutEnergy;
144 G4double tC2 = tC*tC; 144 G4double tC2 = tC*tC;
145 G4double tC3 = tC*tC2; 145 G4double tC3 = tC*tC2;
146 146
147 result = (cofL2+cofR2)*(tM-tC); 147 result = (cofL2+cofR2)*(tM-tC);
148 result -= (cofR2+cofLR*0.5*electron_mass_c 148 result -= (cofR2+cofLR*0.5*electron_mass_c2/energy)*(tM2-tC2)/energy;
149 result += cofR2*(tM3-tC3)/energy/energy/3. 149 result += cofR2*(tM3-tC3)/energy/energy/3.;
150 } 150 }
151 else 151 else
152 { 152 {
153 G4double rtM = 2.*energy/(electron_mass_c 153 G4double rtM = 2.*energy/(electron_mass_c2 + 2.*energy);
154 G4double rtM2 = rtM*rtM; 154 G4double rtM2 = rtM*rtM;
155 G4double rtM3 = rtM*rtM2; 155 G4double rtM3 = rtM*rtM2;
156 156
157 result = (cofL2+cofR2)*rtM*energy; 157 result = (cofL2+cofR2)*rtM*energy;
158 result -= (cofR2*energy+cofLR*0.5*electron 158 result -= (cofR2*energy+cofLR*0.5*electron_mass_c2)*rtM2;
159 result += cofR2*rtM3*energy/3.; 159 result += cofR2*rtM3*energy/3.;
160 } 160 }
161 // result = cofL*cofL + cofR*cofR/3.; 161 // result = cofL*cofL + cofR*cofR/3.;
162 // G4cout<<"cofL2 + cofR2/3. = "<<result<<G4 162 // G4cout<<"cofL2 + cofR2/3. = "<<result<<G4endl;
163 // result -= 0.5*cofL*cofR*electron_mass_c2/ 163 // result -= 0.5*cofL*cofR*electron_mass_c2/energy;
164 164
165 G4double aa = 1.; <<
166 G4double bb = 1.7; <<
167 G4double gw = 2.141*GeV; <<
168 G4double dd = 5000.; <<
169 G4double mw = 80.385*GeV; <<
170 G4double mz = 91.1876*GeV; <<
171 <<
172 G4double emass = electron_mass_c2; <<
173 G4double totS = 2.*energy*emass + emass*ema <<
174 <<
175 if( energy > 50.*GeV ) <<
176 { <<
177 result *= bb; <<
178 result /= 1.+ aa*totS/mz/mz; <<
179 <<
180 if( pName == "anti_nu_e") <<
181 { <<
182 result *= 1. + dd*gw*gw*totS/( (totS-mw* <<
183 } <<
184 } <<
185 <<
186 result *= fCofXsc; //*energy; 165 result *= fCofXsc; //*energy;
187 166
188 result *= ZZ; // incoherent sum over all e 167 result *= ZZ; // incoherent sum over all element electrons
189 168
190 result *= fBiasingFactor; 169 result *= fBiasingFactor;
191 170
192 return result; 171 return result;
193 } 172 }
194 173
195 174