G4VAnnihilationCollision.hh

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// -------------------------------------------------------------------
//      GEANT4 Class file
//
//      For information related to this code contact:
//
//      File name:     G4VElasticCollision
//
//      Author:        Maria Grazia Pia
// 
//      Creation date: 15 April 1999
//
//      Modifications: 
//      
// -------------------------------------------------------------------
 
#ifndef G4VANNIHILATIONCOLLISION_HH
#define G4VANNIHILATIONCOLLISION_HH
 
#include "globals.hh"
#include "G4Log.hh"
#include "G4VCollision.hh"
#include "G4VCrossSectionSource.hh"
#include "G4VAngularDistribution.hh"
#include "G4KineticTrackVector.hh"
 
class G4KineticTrack;
 
 
class G4VAnnihilationCollision : public G4VCollision
{
 
public:
 
  G4VAnnihilationCollision();
 
  virtual ~G4VAnnihilationCollision();
 
  G4bool operator==(const G4VAnnihilationCollision &right) const;
  G4bool operator!=(const G4VAnnihilationCollision &right) const;
 
  virtual G4KineticTrackVector* FinalState(const G4KineticTrack& trk1, 
                          const G4KineticTrack& trk2) const;
  virtual const G4VAngularDistribution* GetAngularDistribution() const
  {
    return theAngularDistribution;
  }
 
protected:
 
  virtual const G4ParticleDefinition* GetOutgoingParticle(const G4KineticTrack& trk1, 
                              const G4KineticTrack& trk2) const = 0;
 
private:  
 
  double BrWigInt0(const double x, const double gamma, const double m0) const
    { return 2.0*gamma*std::atan( 2.0 * (x-m0)/ gamma  ); }
 
  G4double BrWigInt1(const G4double x, const G4double gamma, const G4double m0) const
    { return 0.5*gamma*gamma*G4Log( (x-m0)*(x-m0)+gamma*gamma/4.0 ) + m0*BrWigInt0(x,gamma,m0); }
 
  double BrWigInv(const double x, const double gamma, const double m0) const
    { return 0.5*gamma*std::tan( 0.5*x/gamma )+m0; }
  
  double SampleResonanceMass(const double poleMass, 
                 const double width,
                 const double minMass,
                 const double maxMass) const;
private:
 
 G4VAngularDistribution * theAngularDistribution;
 
};    
 
 
 
 
#endif