| 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 | // $Id: G4StokesVector.hh,v 1.4 2007/11/01 17:32:34 schaelic Exp $ |
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| 27 | // GEANT4 tag $Name: geant4-09-03-cand-01 $ |
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| 28 | // |
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| 29 | // GEANT4 Class header file |
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| 30 | // |
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| 31 | // File name: G4StokesVector |
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| 32 | // |
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| 33 | // Author: Andreas Schaelicke |
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| 34 | // |
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| 35 | // Creation date: 01.05.2005 |
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| 36 | // |
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| 37 | // Modifications: |
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| 38 | // 27-07-06 added some test routines (P.Starovoitov) |
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| 39 | // 25-08-06 modified name of test routines (A.Schaelicke) |
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| 40 | // |
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| 41 | // Class Description: |
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| 42 | // |
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| 43 | // Provides Stokesvector representation employed in implementation of |
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| 44 | // polarized processes. |
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| 45 | // |
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| 46 | // aim: |
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| 47 | // - store three components of a stokesvector |
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| 48 | // - distinguish between boson or fermion state (different transformations) |
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| 49 | // - provide unique definition of reference frame (cf. G4PolarizationHelper) |
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| 50 | // |
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| 51 | |
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| 52 | #ifndef G4StokesVector_h |
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| 53 | #define G4StokesVector_h 1 |
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| 54 | |
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| 55 | #include "G4ThreeVector.hh" |
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| 56 | #include "G4RotationMatrix.hh" |
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| 57 | |
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| 58 | |
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| 59 | class G4StokesVector: public G4ThreeVector |
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| 60 | { |
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| 61 | public: |
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| 62 | // standard vectors: |
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| 63 | static const G4StokesVector ZERO; |
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| 64 | static const G4StokesVector P1; |
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| 65 | static const G4StokesVector P2; |
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| 66 | static const G4StokesVector P3; |
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| 67 | static const G4StokesVector M1; |
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| 68 | static const G4StokesVector M2; |
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| 69 | static const G4StokesVector M3; |
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| 70 | public: |
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| 71 | G4StokesVector(); |
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| 72 | G4StokesVector(const G4ThreeVector & v); |
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| 73 | virtual ~G4StokesVector(); |
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| 74 | public: |
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| 75 | inline G4double p1() const { return x(); } |
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| 76 | inline G4double p2() const { return y(); } |
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| 77 | inline G4double p3() const { return z(); } |
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| 78 | |
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| 79 | inline G4bool IsZero() const { return *this==ZERO; } |
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| 80 | inline G4double Transverse() const { return perp(); } |
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| 81 | |
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| 82 | inline G4ThreeVector PolSqr() const { |
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| 83 | return G4ThreeVector(x()*x(),y()*y(),z()*z()); |
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| 84 | } |
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| 85 | inline G4ThreeVector PolSqrt() const { |
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| 86 | return G4ThreeVector(std::sqrt(x()),std::sqrt(y()),std::sqrt(z())); |
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| 87 | } |
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| 88 | G4ThreeVector PolError(const G4StokesVector & sum2, long n); |
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| 89 | |
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| 90 | // Ratio of 3-vectors. |
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| 91 | G4ThreeVector PolDiv( const G4StokesVector & ); |
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| 92 | |
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| 93 | inline void SetPhoton() { isPhoton=true; } |
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| 94 | |
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| 95 | void RotateAz(G4ThreeVector nInteractionFrame, |
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| 96 | G4ThreeVector particleDirection); |
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| 97 | void InvRotateAz(G4ThreeVector nInteractionFrame, |
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| 98 | G4ThreeVector particleDirection); |
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| 99 | void RotateAz(G4double cosphi, G4double sinphi); |
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| 100 | G4double GetBeta(); |
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| 101 | |
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| 102 | void DiceUniform(); |
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| 103 | void DiceP1(); |
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| 104 | void DiceP2(); |
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| 105 | void DiceP3(); |
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| 106 | |
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| 107 | void FlipP3(); |
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| 108 | private: |
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| 109 | G4bool isPhoton; |
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| 110 | }; |
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| 111 | |
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| 112 | |
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| 113 | #endif |
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