| 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: G4PolarizedBhabhaCrossSection.hh,v 1.2 2006/11/17 14:14:17 vnivanch Exp $
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| 27 | // GEANT4 tag $Name: geant4-09-04-beta-01 $
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| 28 | //
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| 29 | // GEANT4 Class file
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| 30 | //
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| 31 | //
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| 32 | // File name: G4PolarizedBhabhaCrossSection
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| 33 | //
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| 34 | // Author: Andreas Schaelicke and Pavel Starovoitov
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| 35 | //
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| 36 | // Creation date: 12.01.2006
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| 37 | //
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| 38 | // Modifications:
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| 39 | // 16-01-06 included cross section as calculated by P.Starovoitov
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| 40 | //
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| 41 | // Class Description:
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| 42 | // * calculates the differential cross section (ME squared, without phase space)
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| 43 | // incomming positron (along positive z direction) scatters at an electron at rest
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| 44 | // * phi denotes the angle between the scattering plane and the incoming PRF X-axis
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| 45 | // * all stokes vectors refer to spins in the Global System (X,Y,Z)
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| 46 | //
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| 47 | #ifndef G4PolarizedBhabhaCrossSection_h
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| 48 | #define G4PolarizedBhabhaCrossSection_h 1
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| 49 |
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| 50 | #include "G4StokesVector.hh"
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| 51 | #include "G4VPolarizedCrossSection.hh"
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| 52 |
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| 53 | class G4PolarizedBhabhaCrossSection : public G4VPolarizedCrossSection
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| 54 | {
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| 55 | public:
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| 56 | G4PolarizedBhabhaCrossSection();
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| 57 | virtual ~G4PolarizedBhabhaCrossSection();
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| 58 | public:
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| 59 | void Initialize(G4double x, G4double y, G4double phi,
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| 60 | const G4StokesVector & p0,const G4StokesVector & p1,
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| 61 | G4int flag=0);
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| 62 |
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| 63 | G4double XSection(const G4StokesVector & pol2,const G4StokesVector & pol3);
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| 64 | G4double TotalXSection(G4double xmin, G4double xmax, G4double y,
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| 65 | const G4StokesVector & pol0,
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| 66 | const G4StokesVector & pol1);
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| 67 | // return expected mean polarisation
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| 68 | G4StokesVector GetPol2();
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| 69 | G4StokesVector GetPol3();
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| 70 | private:
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| 71 | G4double phi0;
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| 72 | // - part depending on the polarization of the final positron
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| 73 | G4ThreeVector phi2;
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| 74 | // - part depending on the polarization of the final electron
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| 75 | G4ThreeVector phi3;
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| 76 |
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| 77 | };
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| 78 | #endif
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