[824] | 1 | // |
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| 2 | // ******************************************************************** |
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| 3 | // * License and Disclaimer * |
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| 4 | // * * |
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| 5 | // * The Geant4 software is copyright of the Copyright Holders of * |
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| 6 | // * the Geant4 Collaboration. It is provided under the terms and * |
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| 7 | // * conditions of the Geant4 Software License, included in the file * |
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| 8 | // * LICENSE and available at http://cern.ch/geant4/license . These * |
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| 9 | // * include a list of copyright holders. * |
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| 10 | // * * |
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| 11 | // * Neither the authors of this software system, nor their employing * |
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| 12 | // * institutes,nor the agencies providing financial support for this * |
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| 13 | // * work make any representation or warranty, express or implied, * |
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| 14 | // * regarding this software system or assume any liability for its * |
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| 15 | // * use. Please see the license in the file LICENSE and URL above * |
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| 16 | // * for the full disclaimer and the limitation of liability. * |
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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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| 20 | // * By using, copying, modifying or distributing the software (or * |
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| 21 | // * any work based on the software) you agree to acknowledge its * |
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| 22 | // * use in resulting scientific publications, and indicate your * |
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| 23 | // * acceptance of all terms of the Geant4 Software license. * |
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| 24 | // ******************************************************************** |
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| 25 | // |
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| 26 | // ------------------------------------------------------------ |
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| 27 | // GEANT 4 class header file |
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| 28 | // |
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| 29 | // History: |
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| 30 | // 25 July 2007 P.Gumplinger |
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| 31 | // Samples Radiative Muon Decay |
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| 32 | // Reference: |
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| 33 | // TRIUMF/TWIST Technote: |
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| 34 | // "Radiative muon decay" by P. Depommier and A. Vacheret |
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| 35 | // |
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| 36 | // ------------------------------------------------------------ |
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| 37 | // |
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| 38 | // |
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| 39 | // |
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| 40 | // |
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| 41 | |
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| 42 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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| 43 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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| 44 | |
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| 45 | #ifndef G4MuonRadiativeDecayChannelWithSpin_h |
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| 46 | #define G4MuonRadiativeDecayChannelWithSpin_h 1 |
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| 47 | |
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| 48 | #include "globals.hh" |
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| 49 | #include "Randomize.hh" |
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| 50 | #include "G4ThreeVector.hh" |
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| 51 | #include "G4VDecayChannel.hh" |
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| 52 | |
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| 53 | class G4MuonRadiativeDecayChannelWithSpin : public G4VDecayChannel |
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| 54 | { |
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| 55 | // Class Decription |
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| 56 | // This class describes radiative muon decay kinemtics, but |
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| 57 | // gives incorrect energy spectrum for neutrinos |
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| 58 | |
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| 59 | public: // With Description |
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| 60 | |
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| 61 | //Constructors |
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| 62 | G4MuonRadiativeDecayChannelWithSpin(const G4String& theParentName, |
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| 63 | G4double theBR); |
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| 64 | // Destructor |
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| 65 | virtual ~G4MuonRadiativeDecayChannelWithSpin(); |
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| 66 | |
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| 67 | public: // With Description |
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| 68 | |
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| 69 | virtual G4DecayProducts *DecayIt(G4double); |
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| 70 | |
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| 71 | void SetPolarization(G4ThreeVector); |
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| 72 | const G4ThreeVector& GetPolarization() const; |
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| 73 | |
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| 74 | private: |
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| 75 | |
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| 76 | G4ThreeVector parent_polarization; |
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| 77 | |
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| 78 | G4double fron(G4double Pmu, G4double x, G4double y, |
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| 79 | G4double cthetaE, G4double cthetaG, G4double cthetaEG); |
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| 80 | |
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| 81 | // rn3dim generates random vectors, uniformly distributed over the surface |
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| 82 | // of a sphere of given radius. |
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| 83 | // See http://wwwinfo.cern.ch/asdoc/shortwrupsdir/v131/top.html |
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| 84 | |
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| 85 | void rn3dim(G4double& x, G4double& y, G4double& z, G4double xlong); |
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| 86 | |
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| 87 | G4double atan4(G4double x, G4double y); |
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| 88 | |
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| 89 | G4double EMMU; |
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| 90 | G4double EMASS; |
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| 91 | |
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| 92 | }; |
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| 93 | |
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| 94 | inline void G4MuonRadiativeDecayChannelWithSpin:: |
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| 95 | SetPolarization(G4ThreeVector polar) |
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| 96 | { |
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| 97 | parent_polarization = polar; |
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| 98 | } |
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| 99 | |
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| 100 | inline const G4ThreeVector& G4MuonRadiativeDecayChannelWithSpin:: |
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| 101 | GetPolarization() const |
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| 102 | { |
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| 103 | return parent_polarization; |
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| 104 | } |
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| 105 | |
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| 106 | inline void G4MuonRadiativeDecayChannelWithSpin::rn3dim(G4double& x, |
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| 107 | G4double& y, |
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| 108 | G4double& z, |
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| 109 | G4double xlong) |
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| 110 | { |
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| 111 | G4double a = 0.; G4double b = 0.; G4double c = 0.; G4double r = 0.; |
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| 112 | |
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| 113 | do { |
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| 114 | a = G4UniformRand() - 0.5; |
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| 115 | b = G4UniformRand() - 0.5; |
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| 116 | c = G4UniformRand() - 0.5; |
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| 117 | r = a*a + b*b + c*c; |
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| 118 | } while (r > 0.25); |
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| 119 | |
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| 120 | G4double rinv = xlong/(std::sqrt(r)); |
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| 121 | x = a * rinv; |
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| 122 | y = b * rinv; |
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| 123 | z = c * rinv; |
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| 124 | |
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| 125 | return; |
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| 126 | } |
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| 127 | |
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| 128 | inline G4double G4MuonRadiativeDecayChannelWithSpin::atan4(G4double x, |
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| 129 | G4double y) |
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| 130 | { |
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| 131 | G4double phi = 0.; |
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| 132 | |
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| 133 | G4double pi = 4.*std::atan(1.); |
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| 134 | |
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| 135 | if (x==0. && y>0.){ |
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| 136 | phi = 0.5*pi; |
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| 137 | } else if (x==0. && y<0.){ |
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| 138 | phi = 1.5*pi; |
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| 139 | } else if (y==0. && x>0.){ |
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| 140 | phi = 0.; |
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| 141 | } else if (y==0. && x<0.){ |
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| 142 | phi = pi; |
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| 143 | } else if (x>0. ){ |
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| 144 | phi = std::atan(y/x); |
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| 145 | } else if (x<0. ){ |
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| 146 | phi = std::atan(y/x) + pi; |
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| 147 | } |
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| 148 | |
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| 149 | return phi; |
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| 150 | } |
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| 151 | |
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| 152 | #endif |
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