| 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 | // 30 July 2007 P.Gumplinger |
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| 31 | // Samples Radiative Pion Decay |
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| 32 | // Reference: |
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| 33 | // TRIUMF/PIENU Technote: |
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| 34 | // "Inclusion of pi->enug in the Monte Carlo" |
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| 35 | // by M. Blecher |
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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 | |
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| 43 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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| 44 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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| 45 | |
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| 46 | #ifndef G4PionRadiativeDecayChannel_h |
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| 47 | #define G4PionRadiativeDecayChannel_h 1 |
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| 48 | |
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| 49 | #include "globals.hh" |
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| 50 | #include "Randomize.hh" |
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| 51 | #include "G4ThreeVector.hh" |
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| 52 | #include "G4VDecayChannel.hh" |
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| 53 | |
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| 54 | class G4PionRadiativeDecayChannel : public G4VDecayChannel |
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| 55 | { |
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| 56 | // Class Decription |
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| 57 | // This class describes radiative pion decay kinemtics, but |
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| 58 | // gives incorrect energy spectrum for neutrino |
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| 59 | |
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| 60 | public: // With Description |
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| 61 | |
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| 62 | //Constructors |
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| 63 | G4PionRadiativeDecayChannel(const G4String& theParentName, |
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| 64 | G4double theBR); |
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| 65 | // Destructor |
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| 66 | virtual ~G4PionRadiativeDecayChannel(); |
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| 67 | |
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| 68 | public: // With Description |
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| 69 | |
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| 70 | virtual G4DecayProducts *DecayIt(G4double); |
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| 71 | |
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| 72 | private: |
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| 73 | |
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| 74 | G4double beta; |
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| 75 | |
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| 76 | G4double cib; |
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| 77 | G4double csdp; |
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| 78 | G4double csdm; |
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| 79 | G4double cif; |
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| 80 | G4double cig; |
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| 81 | |
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| 82 | G4double xl, yl, xu, yu, d2wmax; |
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| 83 | |
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| 84 | G4double D2W(const G4double x, const G4double y); |
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| 85 | |
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| 86 | }; |
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| 87 | |
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| 88 | inline G4double G4PionRadiativeDecayChannel::D2W(const G4double x, |
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| 89 | const G4double y) |
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| 90 | { |
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| 91 | G4double d2w = cib*(1.-y)*(1.+((1.-x)*(1.-x)))/((x*x)*(x+y-1.)) + |
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| 92 | csdp*(1.-x)*((x+y-1.)*(x+y-1.)) + |
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| 93 | csdm*(1.-x)*((1.-y)*(1.-y)) + |
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| 94 | cif*(x-1.)*(1.-y)/x + |
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| 95 | cig*(1.-y)*(1.-x+(x*x)/(x+y-1.))/x; |
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| 96 | return d2w; |
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| 97 | } |
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| 98 | |
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| 99 | #endif |
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