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25 //
26 //
27
28 #include "globals.hh"
29 #include "G4ios.hh"
30 #include "G4XMesonBaryonElastic.hh"
31 #include "G4KineticTrack.hh"
32 #include "G4Gamma.hh"
33 #include "G4PionPlus.hh"
34 #include "G4Proton.hh"
35 #include "G4XAqmElastic.hh"
36 #include "G4XPDGElastic.hh"
37
38 G4XMesonBaryonElastic::G4XMesonBaryonElastic()
39 {
40 // As a first approximation the model is assumed to be valid over
41 // the entire energy range
42 lowLimit = 0.;
43 highLimit = DBL_MAX;
44 }
45
46
47 G4XMesonBaryonElastic::~G4XMesonBaryonElastic()
48 { }
49
50
51 G4bool G4XMesonBaryonElastic::operator==(const G4XMesonBaryonElastic &right) const
52 {
53 return (this == (G4XMesonBaryonElastic *) &right);
54 }
55
56
57 G4bool G4XMesonBaryonElastic::operator!=(const G4XMesonBaryonElastic &right) const
58 {
59 return (this != (G4XMesonBaryonElastic *) &right);
60 }
61
62
63 G4double G4XMesonBaryonElastic::CrossSection(const G4KineticTrack& trk1, const G4KineticTrack& trk2) const
64 {
65 G4double sigma;
66
67 // No gamma-baryon elastic scattering
68 const G4ParticleDefinition* defLight = FindLightParticle(trk1,trk2);
69 if (defLight == G4Gamma::GammaDefinition())
70 {
71 sigma = 0;
72 }
73 else
74 {
75
76 G4LorentzVector p41 = trk1.Get4Momentum();
77 G4ThreeVector p3 = trk1.GetPosition();
78 G4ParticleDefinition* def = G4PionPlus::PionPlusDefinition();
79
80 G4KineticTrack piTrk(def,
81 trk1.GetFormationTime(),
82 p3,
83 (G4LorentzVector&)p41);
84
85 G4LorentzVector p42 = trk2.Get4Momentum();
86 G4KineticTrack pTrk(((G4ParticleDefinition*)G4Proton::ProtonDefinition()),
87 trk2.GetFormationTime(),
88 (G4ThreeVector)trk2.GetPosition(),
89 (G4LorentzVector&)p42);
90
91 G4XAqmElastic aqm;
92 G4double xAqmDummy = aqm.CrossSection(piTrk,pTrk);
93 G4double xAqm = aqm.CrossSection(trk1,trk2);
94 G4double factor = 1.;
95 if (xAqmDummy != 0.0)
96 {
97 factor = xAqm / xAqmDummy;
98 }
99 G4XPDGElastic pdg;
100
101 sigma = pdg.CrossSection(piTrk,pTrk);
102 sigma = sigma * factor;
103 }
104
105 return sigma;
106 }
107
108
109 G4String G4XMesonBaryonElastic::Name() const
110 {
111 G4String name("MesonBaryonElasticCrossSection");
112 return name;
113 }
114
115
116
117 G4bool G4XMesonBaryonElastic::IsValid(G4double e) const
118 {
119 G4bool answer = InLimits(e,lowLimit,highLimit);
120
121 return answer;
122 }
123