Geant4_10
G4PolarizedAnnihilationCrossSection.hh
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27 // $Id: G4PolarizedAnnihilationCrossSection.hh 68046 2013-03-13 14:31:38Z gcosmo $
28 // -------------------------------------------------------------------
29 //
30 // GEANT4 Class file
31 //
32 //
33 // File name: PolarizedAnnihilationCrossSection
34 //
35 // Author: Andreas Schaelicke and Pavel Starovoitov
36 //
37 // Creation date: 22.03.2006
38 //
39 // Modifications:
40 // 15.10.07 introduced a more general framework for cross sections
41 //
42 // Class Description:
43 // * calculates the differential cross section (ME squared,
44 // without phase space) incoming positron (along positive z direction)
45 // annihilations with an electron at rest
46 // * phi denotes the angle between the scattering plane and
47 // X axis of incoming partice reference frame (PRF)
48 //
49 #ifndef G4PolarizedAnnihilationCrossSection_h
50 #define G4PolarizedAnnihilationCrossSection_h 1
51 
52 #include "G4StokesVector.hh"
54 
56 {
57 public:
60 public:
61  virtual void Initialize(G4double eps, G4double gamma, G4double phi,
62  const G4StokesVector & p0,const G4StokesVector & p1,
63  G4int flag=0);
64 
66  virtual G4double XSection(const G4StokesVector & pol2,
67  const G4StokesVector & pol3);
68  virtual G4double TotalXSection(G4double xmin, G4double xmax,
69  G4double y,
70  const G4StokesVector & pol0,
71  const G4StokesVector & pol1);
72 
73  // return expected mean polarisation
76 
77  virtual G4double GetXmin(G4double y); // minimal energy fraction in TotalXSection
78  virtual G4double GetXmax(G4double y); // maximal energy fraction in TotalXSection
79 
81  // test routine
82  void getCoeff();
83 private:
84  void TotalXS();
85  void DefineCoefficients(const G4StokesVector & pol0,
86  const G4StokesVector & pol1);
87 
88 
89  G4double polxx, polyy, polzz, polxz, polzx, polxy, polyx, polyz, polzy;
90 
91  G4double re2, diffXSFactor, totalXSFactor;
92  // - unpolarised + part depending on the polarization of the intial pair
93  G4double phi0;
94  // - part depending on the polarization of the final positron
95  G4ThreeVector phi2;
96  // - part depending on the polarization of the final electron
97  G4ThreeVector phi3;
98  G4double dice;
99  G4double polXS, unpXS;
100  G4double ISPxx, ISPyy, ISPzz, ISPnd;
101 };
102 #endif
virtual G4double XSection(const G4StokesVector &pol2, const G4StokesVector &pol3)
virtual G4double TotalXSection(G4double xmin, G4double xmax, G4double y, const G4StokesVector &pol0, const G4StokesVector &pol1)
int G4int
Definition: G4Types.hh:78
Double_t y
Definition: plot.C:279
virtual void Initialize(G4double eps, G4double gamma, G4double phi, const G4StokesVector &p0, const G4StokesVector &p1, G4int flag=0)
double G4double
Definition: G4Types.hh:76