| 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: geant4-09-02 $
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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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