G4PionRadiativeDecayChannel.hh

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00025 //
00026 // ------------------------------------------------------------
00027 //      GEANT 4 class header file
00028 //
00029 //      History:
00030 //               30 July 2007 P.Gumplinger
00031 //               Samples Radiative Pion Decay
00032 //               Reference: 
00033 //                    TRIUMF/PIENU Technote: 
00034 //                    "Inclusion of pi->enug in the Monte Carlo" 
00035 //                    by M. Blecher
00036 //
00037 // ------------------------------------------------------------
00038 //
00039 //
00040 //
00041 //
00042 
00043 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
00044 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
00045 
00046 #ifndef G4PionRadiativeDecayChannel_h
00047 #define G4PionRadiativeDecayChannel_h 1
00048 
00049 #include "globals.hh"
00050 #include "Randomize.hh"
00051 #include "G4ThreeVector.hh"
00052 #include "G4VDecayChannel.hh"
00053 
00054 class G4PionRadiativeDecayChannel : public G4VDecayChannel
00055 {
00056   // Class Decription
00057   // This class describes radiative pion decay kinemtics, but
00058   // gives incorrect energy spectrum for neutrino
00059 
00060   public:  // With Description
00061 
00062     //Constructors 
00063     G4PionRadiativeDecayChannel(const G4String& theParentName,
00064                                 G4double        theBR);
00065     //  Destructor
00066     virtual ~G4PionRadiativeDecayChannel();
00067 
00068   protected:
00069     // Copy constructor and assignment operator
00070     G4PionRadiativeDecayChannel(const G4PionRadiativeDecayChannel &);
00071     G4PionRadiativeDecayChannel & operator=(const G4PionRadiativeDecayChannel &);
00072 
00073   protected:
00074       G4PionRadiativeDecayChannel();
00075 
00076   public:  // With Description
00077 
00078     virtual G4DecayProducts *DecayIt(G4double);
00079 
00080   private:
00081 
00082     G4double beta;
00083 
00084     G4double cib;
00085     G4double csdp;
00086     G4double csdm;
00087     G4double cif;
00088     G4double cig;
00089 
00090     G4double xl, yl, xu, yu, d2wmax;
00091 
00092     G4double D2W(const G4double x, const G4double y);
00093 
00094 };
00095 
00096 inline G4double G4PionRadiativeDecayChannel::D2W(const G4double x, 
00097                                                  const G4double y)
00098 {
00099   G4double d2w = cib*(1.-y)*(1.+((1.-x)*(1.-x)))/((x*x)*(x+y-1.)) +
00100                  csdp*(1.-x)*((x+y-1.)*(x+y-1.)) +
00101                  csdm*(1.-x)*((1.-y)*(1.-y)) +
00102                  cif*(x-1.)*(1.-y)/x +
00103                  cig*(1.-y)*(1.-x+(x*x)/(x+y-1.))/x;
00104   return d2w;
00105 }
00106 
00107 #endif

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