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27 // -------------------------------------------------------------------
28 // GEANT4 Class file
29 //
30 // For information related to this code contact:
31 //
32 // File name: G4VElasticCollision
33 //
34 // Author: Maria Grazia Pia
35 //
36 // Creation date: 15 April 1999
37 //
38 // Modifications:
39 //
40 // -------------------------------------------------------------------
41
42 #ifndef G4VANNIHILATIONCOLLISION_HH
43 #define G4VANNIHILATIONCOLLISION_HH
44
45 #include "globals.hh"
46 #include "G4Log.hh"
47 #include "G4VCollision.hh"
48 #include "G4VCrossSectionSource.hh"
49 #include "G4VAngularDistribution.hh"
50 #include "G4KineticTrackVector.hh"
51
52 class G4KineticTrack;
53
54
55 class G4VAnnihilationCollision : public G4VCollision
56 {
57
58 public:
59
60 G4VAnnihilationCollision();
61
62 virtual ~G4VAnnihilationCollision();
63
64 G4bool operator==(const G4VAnnihilationCollision &right) const;
65 G4bool operator!=(const G4VAnnihilationCollision &right) const;
66
67 virtual G4KineticTrackVector* FinalState(const G4KineticTrack& trk1,
68 const G4KineticTrack& trk2) const;
69 virtual const G4VAngularDistribution* GetAngularDistribution() const
70 {
71 return theAngularDistribution;
72 }
73
74 protected:
75
76 virtual const G4ParticleDefinition* GetOutgoingParticle(const G4KineticTrack& trk1,
77 const G4KineticTrack& trk2) const = 0;
78
79 private:
80
81 double BrWigInt0(const double x, const double gamma, const double m0) const
82 { return 2.0*gamma*std::atan( 2.0 * (x-m0)/ gamma ); }
83
84 G4double BrWigInt1(const G4double x, const G4double gamma, const G4double m0) const
85 { return 0.5*gamma*gamma*G4Log( (x-m0)*(x-m0)+gamma*gamma/4.0 ) + m0*BrWigInt0(x,gamma,m0); }
86
87 double BrWigInv(const double x, const double gamma, const double m0) const
88 { return 0.5*gamma*std::tan( 0.5*x/gamma )+m0; }
89
90 double SampleResonanceMass(const double poleMass,
91 const double width,
92 const double minMass,
93 const double maxMass) const;
94 private:
95
96 G4VAngularDistribution * theAngularDistribution;
97
98 };
99
100
101
102
103 #endif
104