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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