G4SingleDiffractiveExcitation.hh

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00027 // $Id$
00028 
00029 #ifndef G4SingleDiffractiveExcitation_h
00030 #define G4SingleDiffractiveExcitation_h 1
00031 // ------------------------------------------------------------
00032 //      GEANT 4 class header file
00033 //
00034 //      ---------------- G4SingleDiffractiveExcitation --------------
00035 //             by Gunter Folger, October 1998.
00036 //      diffractive Excitation used by strings models
00037 //      Take a projectile and a target
00038 //      excite the projectile and target
00039 // ------------------------------------------------------------
00040 
00041 #include <CLHEP/Units/SystemOfUnits.h>
00042 
00043 #include "globals.hh"
00044 #include "G4ThreeVector.hh"
00045 #include "G4QGSDiffractiveExcitation.hh"
00046 
00047 class G4VSplitableHadron;
00048 class G4ExcitedString;
00049 
00050 class G4SingleDiffractiveExcitation : public G4QGSDiffractiveExcitation
00051 {
00052 
00053 public:
00054 
00055         G4SingleDiffractiveExcitation(G4double sigmaPt=0.6*CLHEP::GeV,
00056                                       G4double minExtraMass=250*CLHEP::MeV,
00057                                       G4double x0mass=250*CLHEP::MeV);
00058         ~G4SingleDiffractiveExcitation();
00059 
00060         G4bool ExciteParticipants (G4VSplitableHadron *aPartner, G4VSplitableHadron * bPartner) const;
00061 
00062         //      void SetPtWidth(G4double aValue) { widthOfPtSquare = aValue*aValue; }
00063         //      void SetExtraMass(G4double aValue) { minExtraMass = aValue; }
00064         //      void SetMinimumMass(G4double aValue) { minmass = aValue; }
00065 
00066 
00067 private:
00068 
00069         G4SingleDiffractiveExcitation(const G4SingleDiffractiveExcitation &right);
00070 
00071         G4double ChooseX(G4double Xmin, G4double Xmax) const;
00072         G4ThreeVector GaussianPt(G4double widthSquare, G4double maxPtSquare) const;
00073 
00074         const G4SingleDiffractiveExcitation & operator=(const G4SingleDiffractiveExcitation &right);
00075         int operator==(const G4SingleDiffractiveExcitation &right) const;
00076         int operator!=(const G4SingleDiffractiveExcitation &right) const;
00077 
00078 private:
00079         // Model Parameters:
00080         const G4double widthOfPtSquare; // width^2 of pt for string excitation
00081         const G4double minExtraMass;    // minimum excitation mass 
00082         const G4double minmass; // mean pion transverse mass; used for Xmin 
00083 };
00084 
00085 #endif

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