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// GEANT4 tag $Name: geant4-09-03 $
//
//
// GEANT4 physics class: G4QDiffractionRatio -- header file
// M.V. Kossov, ITEP(Moscow), 24-OCT-01
// The last update: M.V. Kossov, CERN/ITEP (Moscow) 10-Nov-2009
//
//=======================================================================
// Short description: Difraction excitation is a part of the incoherent
// (inelastic) interaction. This part is calculated in the class.
// --------------------------------------------------------------------

#ifndef G4QDiffractionRatio_h
#define G4QDiffractionRatio_h 1

#include "globals.hh"
#include "G4ios.hh"
#include "Randomize.hh"
#include <vector>
#include "G4QPDGCode.hh"
#include "G4QEnvironment.hh"
#include "G4Quasmon.hh"
#include "G4QHadronVector.hh"
#include "G4RandomDirection.hh"


class G4QDiffractionRatio
{
 protected:

  G4QDiffractionRatio()  {}                 // Constructor

 public:

  ~G4QDiffractionRatio() {}                 // Destructor

  static G4QDiffractionRatio* GetPointer(); // Gives a pointer to this singletone

  // Diffraction/Prodaction Ratio (Production=Inelastic-QuasiElastic)
  G4double GetRatio(G4double pIU, G4int prPDG, G4int tgZ, G4int tgN);

  // ==> The following will be a protected function for internal CHIPS usage
  // ProjFragment(pPDG,p4M) on a nucleus (tgZ, tgN), result: Vector of secondary hadrons
  // Whoever uses this member function is responsible for DEL/DESTROY of G4QHadronVector
  G4QHadronVector* ProjFragment(G4int pPDG, G4LorentzVector p4M, G4int tgZ, G4int tgN);

  // ==> The following will be a protected function for internal CHIPS usage
  // TargFragment(pPDG,p4M) on a nucleus (tgZ, tgN), result: Vector of secondary hadrons
  // Whoever uses this member function is responsible for DEL/DESTROY of G4QHadronVector
  G4QHadronVector* TargFragment(G4int pPDG, G4LorentzVector p4M, G4int tgZ, G4int tgN);

  // Single Diffraction Target Excitation Cross-Section (independent Units)
  G4double GetTargSingDiffXS(G4double pIU, G4int prPDG, G4int tgZ, G4int tgN);

 private:
  // These working member functions are in CHIPS units and must not be used externally
  G4double CalcDiff2Prod_Ratio(G4double s, G4int A); // R=Diff/Prod (sqrt(s)(hN) in GeV, A)

 // Body
 private:
};      
#endif
