[819] | 1 | // |
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| 2 | // ******************************************************************** |
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| 17 | // * * |
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| 18 | // * This code implementation is the result of the scientific and * |
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| 19 | // * technical work of the GEANT4 collaboration. * |
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| 21 | // * any work based on the software) you agree to acknowledge its * |
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| 24 | // ******************************************************************** |
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| 25 | // |
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| 26 | // |
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[962] | 27 | // $Id: G4QTauNuclearCrossSection.hh,v 1.6 2008/10/24 19:23:48 dennis Exp $ |
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| 28 | // GEANT4 tag $Name: geant4-09-02-ref-02 $ |
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[819] | 29 | // |
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| 30 | // |
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| 31 | // GEANT4 physics class: G4QTauNuclearCrossSection -- header file |
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| 32 | // M.V. Kossov, CERN-ITEP(Moscow), 4-FEB-2004 |
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| 33 | // The last update: M.V. Kossov, CERN/ITEP (Moscow) 4-Feb-04 |
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| 34 | // |
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| 35 | // Short description: this G4 singletone class calculates tau-lepton-nuclear cross section |
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| 36 | // for the particular isotope (GetCrossSection member function) |
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| 37 | // **************************************************************************************** |
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| 38 | // ********* This HEADER is temporary moved from the photolepton_hadron directory ********* |
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| 39 | // ******* DO NOT MAKE ANY CHANGE! With time it'll move back to photolepton...(M.K.) ****** |
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| 40 | // **************************************************************************************** |
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| 41 | |
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| 42 | #ifndef G4QTauNuclearCrossSection_h |
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| 43 | #define G4QTauNuclearCrossSection_h 1 |
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| 44 | |
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| 45 | #include "G4ParticleTable.hh" |
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| 46 | #include "G4NucleiProperties.hh" |
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| 47 | #include <vector> |
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| 48 | #include "Randomize.hh" |
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| 49 | #include "G4MuonPlus.hh" |
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| 50 | #include "G4MuonMinus.hh" |
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| 51 | #include "G4VQCrossSection.hh" |
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| 52 | |
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| 53 | class G4QTauNuclearCrossSection : public G4VQCrossSection |
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| 54 | { |
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| 55 | protected: |
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| 56 | |
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| 57 | G4QTauNuclearCrossSection() {}; |
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| 58 | |
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| 59 | public: |
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| 60 | |
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| 61 | ~G4QTauNuclearCrossSection() {}; |
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| 62 | |
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| 63 | static G4VQCrossSection* GetPointer(); // Gives a pointer to this singletone |
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| 64 | |
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| 65 | G4double ThresholdEnergy(G4int Z, G4int N, G4int PDG=15); |
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| 66 | |
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| 67 | // At present momentum (pMom) must be in GeV (@@ Units) |
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| 68 | virtual G4double GetCrossSection(G4bool fCS, G4double pMom, G4int tgZ, G4int tgN, |
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| 69 | G4int pPDG=0); |
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| 70 | |
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| 71 | G4double CalculateCrossSection(G4bool CS, G4int F, G4int I, G4int PDG, G4int Z, G4int N, |
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| 72 | G4double Momentum); |
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| 73 | |
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| 74 | G4int GetExchangePDGCode(); |
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| 75 | |
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| 76 | G4double GetExchangeEnergy(); |
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| 77 | |
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| 78 | G4double GetVirtualFactor(G4double nu, G4double Q2); |
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| 79 | |
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| 80 | G4double GetExchangeQ2(G4double nu); |
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| 81 | |
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| 82 | private: |
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| 83 | G4int GetFunctions(G4double a, G4double* x, G4double* y, G4double* z); |
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| 84 | G4double HighEnergyJ1(G4double lE); |
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| 85 | G4double HighEnergyJ2(G4double lE); |
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| 86 | G4double HighEnergyJ3(G4double lE); |
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| 87 | G4double SolveTheEquation(G4double f); |
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| 88 | G4double Fun(G4double x); |
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| 89 | G4double DFun(G4double x); |
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| 90 | |
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| 91 | // Body |
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| 92 | private: |
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| 93 | static G4bool onlyCS; // flag to calculate only CS |
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| 94 | static G4double lastSig; // Last calculated cross section |
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| 95 | static G4int lastL; // Last used in the cross section TheLastBin |
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| 96 | static G4double lastE; // Last used in the cross section Energy |
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| 97 | static G4int lastF; // Last used in the cross section TheFirstBin |
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| 98 | static G4double lastG; // Last value of gamma=lnE-ln(m) |
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| 99 | static G4double lastH; // Last value of the High energy A-dependence |
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| 100 | static G4double* lastJ1; // Pointer to the last array of the J1 function |
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| 101 | static G4double* lastJ2; // Pointer to the last array of the J2 function |
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| 102 | static G4double* lastJ3; // Pointer to the last array of the J3 function |
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| 103 | static G4int lastPDG; // The last projectile PDG |
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| 104 | static G4int lastN; // The last N of calculated nucleus |
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| 105 | static G4int lastZ; // The last Z of calculated nucleus |
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| 106 | static G4double lastP; // Last used in the cross section Momentum |
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| 107 | static G4double lastTH; // Last value of the Momentum Threshold |
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| 108 | static G4double lastCS; // Last value of the Cross Section |
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| 109 | static G4int lastI; // The last position in the DAMDB |
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| 110 | }; |
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| 111 | |
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| 112 | inline G4double G4QTauNuclearCrossSection::DFun(G4double x)// Parametrization of PhotNucCS |
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| 113 | { |
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| 114 | static const G4double shd=1.0734; // HE PomShadowing(D) |
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| 115 | static const G4double poc=0.0375; // HE Pomeron coefficient |
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| 116 | static const G4double pos=16.5; // HE Pomeron shift |
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| 117 | static const G4double reg=.11; // HE Reggeon slope |
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| 118 | static const G4double mtu=1777.; // Mass of a muon in MeV |
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| 119 | static const G4double lmtu=std::log(mtu); // Log of a muon mass |
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| 120 | G4double y=std::exp(x-lastG-lmtu); // y for the x |
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| 121 | G4double flux=lastG*(2.-y*(2.-y))-1.; // flux factor |
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| 122 | return (poc*(x-pos)+shd*std::exp(-reg*x))*flux; |
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| 123 | } |
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| 124 | |
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| 125 | inline G4double G4QTauNuclearCrossSection::Fun(G4double x) // Integrated PhoNucCS |
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| 126 | { |
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| 127 | G4double dlg1=lastG+lastG-1.; |
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| 128 | G4double lgoe=lastG/lastE; |
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| 129 | G4double HE2=HighEnergyJ2(x); |
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| 130 | return dlg1*HighEnergyJ1(x)-lgoe*(HE2+HE2-HighEnergyJ3(x)/lastE); |
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| 131 | } |
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| 132 | |
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| 133 | inline G4double G4QTauNuclearCrossSection::HighEnergyJ1(G4double lEn) |
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| 134 | { |
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| 135 | static const G4double le=std::log(50000.); // log(E0) |
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| 136 | static const G4double le2=le*le; // log(E0)^2 |
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| 137 | static const G4double a=.0375; // a |
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| 138 | static const G4double ha=a*.5; // a/2 |
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| 139 | static const G4double ab=a*16.5; // a*b |
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| 140 | static const G4double d=0.11; // d |
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| 141 | static const G4double cd=1.0734/d; // c/d |
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| 142 | static const G4double ele=std::exp(-d*le); // E0^(-d) |
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| 143 | return ha*(lEn*lEn-le2)-ab*(lEn-le)-cd*(std::exp(-d*lEn)-ele); |
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| 144 | } |
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| 145 | |
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| 146 | inline G4double G4QTauNuclearCrossSection::HighEnergyJ2(G4double lEn) |
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| 147 | { |
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| 148 | static const G4double e=50000.; // E0 |
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| 149 | static const G4double le=std::log(e); // log(E0) |
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| 150 | static const G4double le1=(le-1.)*e; // (log(E0)-1)*E0 |
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| 151 | static const G4double a=.0375; // a |
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| 152 | static const G4double ab=a*16.5; // a*b |
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| 153 | static const G4double d=1.-0.11; // 1-d |
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| 154 | static const G4double cd=1.0734/d; // c/(1-d) |
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| 155 | static const G4double ele=std::exp(d*le); // E0^(1-d) |
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| 156 | G4double En=std::exp(lEn); |
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| 157 | return a*((lEn-1.)*En-le1)-ab*(En-e)+cd*(std::exp(d*lEn)-ele); |
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| 158 | } |
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| 159 | |
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| 160 | inline G4double G4QTauNuclearCrossSection::HighEnergyJ3(G4double lEn) |
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| 161 | { |
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| 162 | static const G4double e=50000.; // E0 |
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| 163 | static const G4double le=std::log(e); // log(E0) |
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| 164 | static const G4double e2=e*e; // E0^2 |
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| 165 | static const G4double leh=(le-.5)*e2; // (log(E0)-.5)*E0^2 |
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| 166 | static const G4double ha=.0375*.5; // a/2 |
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| 167 | static const G4double hab=ha*16.5; // a*b/2 |
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| 168 | static const G4double d=2.-.11; // 2-d |
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| 169 | static const G4double cd=1.0734/d; // c/(2-d) |
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| 170 | static const G4double ele=std::exp(d*le); // E0^(2-d) |
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| 171 | G4double lastE2=std::exp(lEn+lEn); |
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| 172 | return ha*((lEn-.5)*lastE2-leh)-hab*(lastE2-e2)+cd*(std::exp(d*lEn)-ele); |
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| 173 | } |
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| 174 | |
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| 175 | #endif |
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