Geant4 Cross Reference

Cross-Referencing   Geant4
Geant4/processes/hadronic/models/im_r_matrix/src/G4XMesonBaryonElastic.cc

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  1 //
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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