Geant4 Cross Reference |
1 // 1 2 // ******************************************* 3 // * License and Disclaimer 4 // * 5 // * The Geant4 software is copyright of th 6 // * the Geant4 Collaboration. It is provided 7 // * conditions of the Geant4 Software License 8 // * LICENSE and available at http://cern.ch/ 9 // * include a list of copyright holders. 10 // * 11 // * Neither the authors of this software syst 12 // * institutes,nor the agencies providing fin 13 // * work make any representation or warran 14 // * regarding this software system or assum 15 // * use. Please see the license in the file 16 // * for the full disclaimer and the limitatio 17 // * 18 // * This code implementation is the result 19 // * technical work of the GEANT4 collaboratio 20 // * By using, copying, modifying or distri 21 // * any work based on the software) you ag 22 // * use in resulting scientific publicati 23 // * acceptance of all terms of the Geant4 Sof 24 // ******************************************* 25 // 26 27 28 #include "G4NeutrinoElectronCcXsc.hh" 29 #include "G4PhysicalConstants.hh" 30 #include "G4SystemOfUnits.hh" 31 #include "G4DynamicParticle.hh" 32 #include "G4ParticleTable.hh" 33 #include "G4IonTable.hh" 34 #include "G4HadTmpUtil.hh" 35 #include "G4NistManager.hh" 36 37 #include "G4MuonMinus.hh" 38 #include "G4TauMinus.hh" 39 40 using namespace std; 41 using namespace CLHEP; 42 43 G4NeutrinoElectronCcXsc::G4NeutrinoElectronCcX 44 : G4VCrossSectionDataSet("NuElectronCcXsc") 45 { 46 // PDG2016: Gf=1.1663787(6)e-5*(hc)^3/GeV^2 47 // fCofXsc = Gf*Gf*MeC2*2/pi 48 49 fCofXsc = 1.36044e-22; 50 fCofXsc *= hbarc*hbarc*electron_mass_c2; 51 fCofXsc /= halfpi; 52 53 // G4cout<<"fCofXsc = "<<fCofXsc*GeV/cm2<<" 54 55 // G4cout<<"hbarc = "<<hbarc/MeV/fermi<<" Me 56 57 // PDG2016: sin^2 theta Weinberg 58 59 fSin2tW = 0.23129; // 0.2312; 60 61 fCutEnergy = 0.; // default value 62 63 fBiasingFactor = 1.; // default as physics 64 65 theMuonMinus = G4MuonMinus::MuonMinus(); 66 theTauMinus = G4TauMinus::TauMinus(); 67 } 68 69 G4NeutrinoElectronCcXsc::~G4NeutrinoElectronCc 70 {} 71 72 ////////////////////////////////////////////// 73 74 G4bool 75 G4NeutrinoElectronCcXsc::IsElementApplicable( 76 { 77 G4bool result = false; 78 G4String pName = aPart->GetDefinition()->Get 79 G4double minEnergy = 0., energy = aPart->Get 80 G4double fmass, emass = electron_mass_c2; 81 82 if( pName == "anti_nu_e" || pName == "n 83 else if( pName == "nu_tau" || pName == "ant 84 else fmass = emass; 85 86 minEnergy = (fmass-emass)*(fmass+emass)/emas 87 88 if( ( pName == "nu_mu" || pName == "anti_nu 89 pName == "nu_tau" || pName == "anti_nu 90 energy > minEnergy 91 { 92 result = true; 93 } 94 return result; 95 } 96 97 ////////////////////////////////////////////// 98 99 G4double G4NeutrinoElectronCcXsc:: 100 GetElementCrossSection(const G4DynamicParticle 101 const G4Material*) 102 { 103 G4double result = 0., totS, fmass, fmass2, e 104 105 G4double energy = aPart->GetTotalEnergy(); 106 G4String pName = aPart->GetDefinition()->G 107 108 emass2 = emass*emass; 109 totS = 2.*energy*emass + emass2; 110 111 if( pName == "anti_nu_e" || pName == "nu_mu" 112 { 113 fmass = theMuonMinus->GetPDGMass(); 114 fmass2 = fmass*fmass; 115 result = (1. - fmass2/totS)*(1. - fmass2/t 116 } 117 else if( pName == "anti_nu_mu") 118 { 119 fmass = theMuonMinus->GetPDGMass(); 120 fmass2 = fmass*fmass; 121 122 result = (1.+ emass2/totS)*(1.+ fmass2/to 123 result += (1.- emass2/totS)*(1.- fmass2/to 124 result *= 0.25*(1. - fmass2/totS)*(1. - fm 125 } 126 else if( pName == "nu_tau") 127 { 128 fmass = theTauMinus->GetPDGMass(); 129 fmass2 = fmass*fmass; 130 result = (1. - fmass2/totS)*(1. - fmass2/t 131 } 132 else if( pName == "anti_nu_tau") 133 { 134 fmass = theTauMinus->GetPDGMass(); 135 fmass2 = fmass*fmass; 136 137 result = (1.+ emass2/totS)*(1.+ fmass2/to 138 result += (1.- emass2/totS)*(1.- fmass2/to 139 result *= 0.25*(1. - fmass2/totS)*(1. - fm 140 } 141 else 142 { 143 return result; 144 } 145 // if( energy <= electron_mass_c2 ) return r 146 147 G4double aa = 1.; 148 G4double bb = 1.7; 149 G4double gw = 2.141*GeV; 150 G4double dd = 5000.; 151 G4double mw = 80.385*GeV; 152 153 if( energy > 50.*GeV ) 154 { 155 result *= bb; 156 result /= 1.+ aa*totS/mw/mw; 157 158 if( pName == "anti_nu_e") 159 { 160 result *= 1. + dd*gw*gw*totS/( (totS-mw* 161 } 162 } 163 result *= fCofXsc; //*energy; 164 result *= energy + 0.5*emass; 165 result *= ZZ; // incoherent sum over all e 166 167 result *= fBiasingFactor; // biasing up, if 168 169 return result; 170 } 171 172