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#ifndef G4QuarkExchange_h
#define G4QuarkExchange_h 1
// ------------------------------------------------------------
//      GEANT 4 class header file
//
//      ---------------- G4QuarkExchange --------------
//             by V. Uzhinsky, October 2016.
//       QuarkExchange is used by strings models.
//	    Take a projectile and a target.
//Simulate Q exchange with excitation of projectile or target.
// ------------------------------------------------------------

//#include "G4SystemOfUnits.hh"
#include "globals.hh"
#include "G4ThreeVector.hh"
//#include "G4QGSDiffractiveExcitation.hh"

class G4VSplitableHadron;
class G4ExcitedString;

class G4QuarkExchange
{
  public:
	G4QuarkExchange();
	~G4QuarkExchange();

	G4bool ExciteParticipants (G4VSplitableHadron *aPartner, G4VSplitableHadron * bPartner) const;

  private:
	G4QuarkExchange(const G4QuarkExchange &right);

	G4ThreeVector GaussianPt(G4double widthSquare, G4double maxPtSquare) const;

	const G4QuarkExchange & operator=(const G4QuarkExchange &right);
	G4bool operator==(const G4QuarkExchange &right) const;
	G4bool operator!=(const G4QuarkExchange &right) const;
};

#endif
