| Geant4 Cross Reference |
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 // Geant4 Class header file
27 //
28 // File name: G4StokesVector
29 //
30 // Author: Andreas Schaelicke
31 //
32 // Class Description:
33 // Provides Stokesvector representation employed in implementation of
34 // polarized processes.
35 // - store three components of a stokesvector
36 // - distinguish between boson or fermion state (different transformations)
37 // - provide unique definition of reference frame (cf. G4PolarizationHelper)
38
39 #ifndef G4StokesVector_h
40 #define G4StokesVector_h 1
41
42 #include "G4ThreeVector.hh"
43 #include "G4RotationMatrix.hh"
44
45 class G4StokesVector : public G4ThreeVector
46 {
47 public:
48 G4StokesVector();
49 explicit G4StokesVector(const G4ThreeVector& v);
50 ~G4StokesVector() = default;
51
52 G4bool IsZero() const;
53
54 inline G4double p1() const { return x(); }
55 inline G4double p2() const { return y(); }
56 inline G4double p3() const { return z(); }
57
58 inline G4double Transverse() const { return perp(); }
59
60 inline G4ThreeVector PolSqr() const
61 {
62 return G4ThreeVector(x() * x(), y() * y(), z() * z());
63 }
64 inline G4ThreeVector PolSqrt() const
65 {
66 return G4ThreeVector(std::sqrt(x()), std::sqrt(y()), std::sqrt(z()));
67 }
68 G4ThreeVector PolError(const G4StokesVector& sum2, long n);
69
70 // Ratio of 3-vectors.
71 G4ThreeVector PolDiv(const G4StokesVector&);
72
73 inline void SetPhoton() { fIsPhoton = true; }
74
75 void RotateAz(G4ThreeVector nInteractionFrame,
76 G4ThreeVector particleDirection);
77 void InvRotateAz(G4ThreeVector nInteractionFrame,
78 G4ThreeVector particleDirection);
79 void RotateAz(G4double cosphi, G4double sinphi);
80 G4double GetBeta();
81
82 void DiceUniform();
83 void DiceP1();
84 void DiceP2();
85 void DiceP3();
86
87 void FlipP3();
88
89 // standard vectors:
90 static const G4StokesVector ZERO;
91 static const G4StokesVector P1;
92 static const G4StokesVector P2;
93 static const G4StokesVector P3;
94 static const G4StokesVector M1;
95 static const G4StokesVector M2;
96 static const G4StokesVector M3;
97
98 private:
99 G4bool fIsPhoton;
100 };
101
102 #endif
103