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// $Id: G4PolarizedMollerBhabhaModel.hh,v 1.3 2007/05/23 08:52:20 vnivanch Exp $
// GEANT4 tag $Name: geant4-09-02 $
// -------------------------------------------------------------------
//
// GEANT4 Class header file
//
//
// File name:     G4PolarizedMollerBhabhaModel
//
// Author:        A.Schaelicke on base of Vladimir Ivanchenko code
//
// Creation date: 10.11.2005
//
// Modifications:
//
// 20-08-05, modified interface (A.Schaelicke)
//
//
// Class Description:
//
// Physics implementation of polarized Bhabha/Moller scattering
//
// -------------------------------------------------------------------
//

#ifndef G4PolarizedMollerBhabhaModel_h
#define G4PolarizedMollerBhabhaModel_h 1

#include "G4VEmModel.hh"
#include "G4MollerBhabhaModel.hh"
#include "G4StokesVector.hh"

class G4VPolarizedCrossSection;

class G4PolarizedMollerBhabhaModel : public G4MollerBhabhaModel
{

public:

  G4PolarizedMollerBhabhaModel(const G4ParticleDefinition* p =0, 
			     const G4String& nam = "PolarizedMollerBhabha");

  virtual ~G4PolarizedMollerBhabhaModel();

  virtual G4double ComputeCrossSectionPerElectron(
                                const G4ParticleDefinition*,
                                      G4double kinEnergy, 
                                      G4double cut,
                                      G4double emax);

  virtual void SampleSecondaries(std::vector<G4DynamicParticle*>*,
				 const G4MaterialCutsCouple*,
				 const G4DynamicParticle*,
				 G4double tmin,
				 G4double maxEnergy);


  // polarization access routines (may go if using a modified ParticleChange)

  void SetTargetPolarization(const G4ThreeVector & pTarget)
  {
    theTargetPolarization = pTarget;
  }
  void SetBeamPolarization(const G4ThreeVector & pBeam)
  {
    theBeamPolarization = pBeam;
  }
  const G4StokesVector & GetTargetPolarization()
  {
    return theTargetPolarization;
  }
  const G4StokesVector & GetBeamPolarization()
  {
    return theBeamPolarization;
  }
  const G4StokesVector & GetFinalElectronPolarization()
  {
    return fElectronPolarization;
  }
  const G4StokesVector &  GetFinalPositronPolarization()
  {
    return fPositronPolarization;
  }
private:
  G4StokesVector theBeamPolarization;
  G4StokesVector theTargetPolarization;

  G4VPolarizedCrossSection * crossSectionCalculator;

  G4StokesVector fPositronPolarization;
  G4StokesVector fElectronPolarization;
};

//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......

#endif