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27
28 #ifndef G4DiffractiveExcitation_h
29 #define G4DiffractiveExcitation_h 1
30
31 // ------------------------------------------------------------
32 // GEANT 4 class header file
33 //
34 // ---------------- G4DiffractiveExcitation --------------
35 // by Gunter Folger, October 1998.
36 // diffractive Excitation used by strings models
37 // Take a projectile and a target
38 // excite the projectile and target
39 // ------------------------------------------------------------
40
41 #include "globals.hh"
42 #include "G4FTFParameters.hh"
43 #include "G4ElasticHNScattering.hh"
44 #include "G4ThreeVector.hh"
45 #include "G4LorentzVector.hh"
46 #include "G4LorentzRotation.hh"
47
48 class G4VSplitableHadron;
49 class G4ExcitedString;
50
51
52 class G4DiffractiveExcitation {
53 public:
54 G4DiffractiveExcitation();
55 virtual ~G4DiffractiveExcitation();
56
57 virtual G4bool ExciteParticipants( G4VSplitableHadron* aPartner,
58 G4VSplitableHadron* bPartner,
59 G4FTFParameters* theParameters,
60 G4ElasticHNScattering* theElastic ) const;
61
62 virtual void CreateStrings( G4VSplitableHadron* aHadron,
63 G4bool isProjectile,
64 G4ExcitedString*& FirstString,
65 G4ExcitedString*& SecondString,
66 G4FTFParameters* theParameters ) const;
67
68 private:
69 G4DiffractiveExcitation( const G4DiffractiveExcitation& right );
70 const G4DiffractiveExcitation& operator=( const G4DiffractiveExcitation& right );
71 G4bool operator==( const G4DiffractiveExcitation& right ) const;
72 G4bool operator!=( const G4DiffractiveExcitation& right ) const;
73
74 G4double LambdaF(G4double sqrM, G4double sqrM1, G4double sqrM2) const;
75
76 G4ThreeVector GaussianPt( G4double AveragePt2, G4double maxPtSquare ) const;
77 G4double ChooseP( G4double Pmin, G4double Pmax ) const;
78 G4double GetQuarkFractionOfKink( G4double zmin, G4double zmax ) const;
79 void UnpackMeson( G4int IdPDG, G4int& Q1, G4int& Q2 ) const;
80 void UnpackBaryon( G4int IdPDG, G4int& Q1, G4int& Q2, G4int& Q3 ) const;
81 G4int NewNucleonId( G4int Q1, G4int Q2, G4int Q3 ) const;
82
83 // The "ExciteParticipants" method uses the following struct and 3 new utility methods:
84 struct CommonVariables {
85 G4int ProjectilePDGcode = 0, absProjectilePDGcode = 0, TargetPDGcode = 0,
86 absTargetPDGcode = 0;
87 G4double M0projectile = 0.0, M0projectile2 = 0.0, M0target = 0.0, M0target2 = 0.0,
88 ProjMassT = 0.0, ProjMassT2 = 0.0, TargMassT = 0.0, TargMassT2 = 0.0,
89 MminProjectile = 0.0, MminTarget = 0.0,
90 ProjectileDiffStateMinMass = 0.0, ProjectileDiffStateMinMass2 = 0.0,
91 ProjectileNonDiffStateMinMass = 0.0, ProjectileNonDiffStateMinMass2 = 0.0,
92 TargetDiffStateMinMass = 0.0, TargetDiffStateMinMass2 = 0.0,
93 TargetNonDiffStateMinMass = 0.0, TargetNonDiffStateMinMass2 = 0.0,
94 S = 0.0, SqrtS = 0.0, Pt2 = 0.0, PZcms = 0.0, PZcms2 = 0.0,
95 AveragePt2 = 0.0, maxPtSquare = 0.0,
96 ProbExc = 0.0, Qminus = 0.0, Qplus = 0.0,
97 PMinusNew = 0.0, PPlusNew = 0.0, TMinusNew = 0.0, TPlusNew = 0.0,
98 PMinusMin = 0.0, PMinusMax = 0.0, TPlusMin = 0.0, TPlusMax = 0.0,
99 ProbProjectileDiffraction = 0.0, ProbTargetDiffraction = 0.0, ProbOfDiffraction = 0.0;
100 G4LorentzVector Pprojectile, Ptarget, Qmomentum;
101 G4LorentzRotation toCms, toLab;
102 G4SampleResonance BrW;
103 };
104 G4int ExciteParticipants_doChargeExchange( G4VSplitableHadron* projectile,
105 G4VSplitableHadron* target,
106 G4FTFParameters* theParameters,
107 G4ElasticHNScattering* theElastic,
108 CommonVariables& common ) const;
109 G4bool ExciteParticipants_doDiffraction( G4VSplitableHadron* projectile,
110 G4VSplitableHadron* target,
111 G4FTFParameters* theParameters,
112 CommonVariables& common ) const;
113 G4bool ExciteParticipants_doNonDiffraction( G4VSplitableHadron* projectile,
114 G4VSplitableHadron* target,
115 G4FTFParameters* theParameters,
116 CommonVariables& common ) const;
117 };
118
119 #endif
120
121