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//
// -------------------------------------------------------------------
//
// GEANT4 Class header file
//
//
// File name:     G4MuPairProductionModel
//
// Author:        Vladimir Ivanchenko on base of Laszlo Urban code
// 
// Creation date: 18.05.2002
//
// Modifications: 

//
// Class Description: 
//
// Implementation of e+e- pair production by muons
// 

// -------------------------------------------------------------------
//

#ifndef G4MuPairProductionModel_h
#define G4MuPairProductionModel_h 1

#include "G4VEmModel.hh"

class G4MuPairProductionModel : public G4VEmModel
{

public:

  G4MuPairProductionModel(const G4ParticleDefinition* p = 0);

  ~G4MuPairProductionModel();

  G4double HighEnergyLimit(const G4ParticleDefinition* p,
                           const G4Material*);
 
  G4double LowEnergyLimit(const G4ParticleDefinition* p,
                          const G4Material*);

  void SetHighEnergyLimit(const G4Material*, G4double e) {highKinEnergy = e;};
 
  void SetLowEnergyLimit(const G4Material*, G4double e) {lowKinEnergy = e;};

  G4double MinEnergyCut(const G4ParticleDefinition*,
                        const G4Material*);
 
  G4bool IsInCharge(const G4ParticleDefinition*,
	            const G4Material*);

  G4double ComputeDEDX(const G4Material*,
                       const G4ParticleDefinition*,
                             G4double kineticEnergy,
                             G4double cutEnergy);

  G4double CrossSection(const G4Material*,
                        const G4ParticleDefinition*,
                              G4double kineticEnergy,
                              G4double cutEnergy,
                              G4double maxEnergy);

  G4std::vector<G4DynamicParticle*>* SampleSecondary(
                                const G4Material*,
                                const G4DynamicParticle*,
                                      G4double tmin,
                                      G4double maxEnergy);

  virtual G4double MaxSecondaryEnergy(
				const G4DynamicParticle* dynParticle); 
protected:

  virtual G4double MaxSecondaryEnergy(const G4ParticleDefinition*,
    				            G4double kineticEnergy); 

private:

  G4double ComputMuPairLoss(G4double Z, G4double tkin, G4double cut);  

  G4double ComputeMicroscopicCrossSection(G4double tkin,
                                          G4double Z,
                                          G4double A,   
                                          G4double cut);

  G4double ComputeDMicroscopicCrossSection(G4double tkin,
                                           G4double Z,
                                           G4double pairEnergy);                                    

  G4double ComputeDDMicroscopicCrossSection(G4double tkin,
                                           G4double Z,
                                           G4double pairEnergy,
                                           G4double asymmetry);                                    

  void ComputePartialSumSigma(const G4Material* material, G4double tkin, G4double cut);

  const G4Element* SelectRandomAtom(const G4Material* material) const;

  void MakeSamplingTables();

  // hide assignment operator 
  G4MuPairProductionModel & operator=(const  G4MuPairProductionModel &right);
  G4MuPairProductionModel(const  G4MuPairProductionModel&);

  G4double minPairEnergy;
  G4double highKinEnergy;
  G4double lowKinEnergy;
  G4double minThreshold;

  // tables for sampling 
  G4int nzdat,ntdat,NBIN;
  static G4double zdat[5],adat[5],tdat[8];
  G4double ya[1001],proba[5][8][1001];

  const G4Material* oldMaterial;
  G4std::vector<G4DataVector*> partialSumSigma;
  G4bool  samplingTablesAreFilled;
};

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

inline 
G4double G4MuPairProductionModel::MaxSecondaryEnergy(
				 const G4DynamicParticle* dynParticle)
{
  return dynParticle->GetKineticEnergy();
} 

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

inline 
G4double G4MuPairProductionModel::MaxSecondaryEnergy(
                                 const G4ParticleDefinition*,
    				       G4double kineticEnergy)
{
  return kineticEnergy;
}

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

#endif