Geant4  10.01
G4PolarizedAnnihilationCrossSection.hh
Go to the documentation of this file.
1 //
2 // ********************************************************************
3 // * License and Disclaimer *
4 // * *
5 // * The Geant4 software is copyright of the Copyright Holders of *
6 // * the Geant4 Collaboration. It is provided under the terms and *
7 // * conditions of the Geant4 Software License, included in the file *
8 // * LICENSE and available at http://cern.ch/geant4/license . These *
9 // * include a list of copyright holders. *
10 // * *
11 // * Neither the authors of this software system, nor their employing *
12 // * institutes,nor the agencies providing financial support for this *
13 // * work make any representation or warranty, express or implied, *
14 // * regarding this software system or assume any liability for its *
15 // * use. Please see the license in the file LICENSE and URL above *
16 // * for the full disclaimer and the limitation of liability. *
17 // * *
18 // * This code implementation is the result of the scientific and *
19 // * technical work of the GEANT4 collaboration. *
20 // * By using, copying, modifying or distributing the software (or *
21 // * any work based on the software) you agree to acknowledge its *
22 // * use in resulting scientific publications, and indicate your *
23 // * acceptance of all terms of the Geant4 Software license. *
24 // ********************************************************************
25 //
26 // -------------------------------------------------------------------
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 
90 
92  // - unpolarised + part depending on the polarization of the intial pair
94  // - part depending on the polarization of the final positron
96  // - part depending on the polarization of the final electron
101 };
102 #endif
virtual G4double XSection(const G4StokesVector &pol2, const G4StokesVector &pol3)
CLHEP::Hep3Vector G4ThreeVector
void DefineCoefficients(const G4StokesVector &pol0, const G4StokesVector &pol1)
virtual G4double TotalXSection(G4double xmin, G4double xmax, G4double y, const G4StokesVector &pol0, const G4StokesVector &pol1)
static const G4double eps
int G4int
Definition: G4Types.hh:78
virtual void Initialize(G4double eps, G4double gamma, G4double phi, const G4StokesVector &p0, const G4StokesVector &p1, G4int flag=0)
double G4double
Definition: G4Types.hh:76