| 1 | //
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| 2 | // ********************************************************************
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| 3 | // * License and Disclaimer *
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| 4 | // * *
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| 5 | // * The Geant4 software is copyright of the Copyright Holders of *
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| 6 | // * the Geant4 Collaboration. It is provided under the terms and *
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| 7 | // * conditions of the Geant4 Software License, included in the file *
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| 8 | // * LICENSE and available at http://cern.ch/geant4/license . These *
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| 9 | // * include a list of copyright holders. *
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| 10 | // * *
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| 11 | // * Neither the authors of this software system, nor their employing *
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| 12 | // * institutes,nor the agencies providing financial support for this *
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| 13 | // * work make any representation or warranty, express or implied, *
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| 14 | // * regarding this software system or assume any liability for its *
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| 15 | // * use. Please see the license in the file LICENSE and URL above *
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| 16 | // * for the full disclaimer and the limitation of liability. *
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| 17 | // * *
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| 18 | // * This code implementation is the result of the scientific and *
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| 19 | // * technical work of the GEANT4 collaboration. *
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| 20 | // * By using, copying, modifying or distributing the software (or *
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| 21 | // * any work based on the software) you agree to acknowledge its *
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| 22 | // * use in resulting scientific publications, and indicate your *
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| 23 | // * acceptance of all terms of the Geant4 Software license. *
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| 24 | // ********************************************************************
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| 25 | //
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| 26 | //
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| 27 |
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| 28 | #include "globals.hh"
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| 29 | #include "G4ios.hh"
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| 30 | #include "G4XMesonBaryonElastic.hh"
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| 31 | #include "G4KineticTrack.hh"
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| 32 | #include "G4Gamma.hh"
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| 33 | #include "G4PionPlus.hh"
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| 34 | #include "G4Proton.hh"
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| 35 | #include "G4XAqmElastic.hh"
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| 36 | #include "G4XPDGElastic.hh"
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| 37 |
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| 38 | G4XMesonBaryonElastic::G4XMesonBaryonElastic()
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| 39 | {
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| 40 | // As a first approximation the model is assumed to be valid over
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| 41 | // the entire energy range
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| 42 | lowLimit = 0.;
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| 43 | highLimit = DBL_MAX;
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| 44 | }
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| 45 |
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| 46 |
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| 47 | G4XMesonBaryonElastic::~G4XMesonBaryonElastic()
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| 48 | { }
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| 49 |
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| 50 |
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| 51 | G4bool G4XMesonBaryonElastic::operator==(const G4XMesonBaryonElastic &right) const
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| 52 | {
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| 53 | return (this == (G4XMesonBaryonElastic *) &right);
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| 54 | }
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| 55 |
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| 56 |
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| 57 | G4bool G4XMesonBaryonElastic::operator!=(const G4XMesonBaryonElastic &right) const
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| 58 | {
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| 59 | return (this != (G4XMesonBaryonElastic *) &right);
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| 60 | }
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| 61 |
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| 62 |
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| 63 | G4double G4XMesonBaryonElastic::CrossSection(const G4KineticTrack& trk1, const G4KineticTrack& trk2) const
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| 64 | {
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| 65 | G4double sigma;
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| 66 |
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| 67 | // No gamma-baryon elastic scattering
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| 68 | const G4ParticleDefinition* defLight = FindLightParticle(trk1,trk2);
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| 69 | if (defLight == G4Gamma::GammaDefinition())
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| 70 | {
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| 71 | sigma = 0;
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| 72 | }
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| 73 | else
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| 74 | {
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| 75 |
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| 76 | G4LorentzVector p41 = trk1.Get4Momentum();
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| 77 | G4ThreeVector p3 = trk1.GetPosition();
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| 78 | G4ParticleDefinition* def = G4PionPlus::PionPlusDefinition();
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| 79 |
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| 80 | G4KineticTrack piTrk(def,
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| 81 | trk1.GetFormationTime(),
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| 82 | p3,
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| 83 | (G4LorentzVector&)p41);
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| 84 |
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| 85 | G4LorentzVector p42 = trk2.Get4Momentum();
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| 86 | G4KineticTrack pTrk(((G4ParticleDefinition*)G4Proton::ProtonDefinition()),
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| 87 | trk2.GetFormationTime(),
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| 88 | (G4ThreeVector)trk2.GetPosition(),
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| 89 | (G4LorentzVector&)p42);
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| 90 |
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| 91 | G4XAqmElastic aqm;
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| 92 | G4double xAqmDummy = aqm.CrossSection(piTrk,pTrk);
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| 93 | G4double xAqm = aqm.CrossSection(trk1,trk2);
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| 94 | G4double factor = 1.;
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| 95 | if (xAqmDummy != 0.0)
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| 96 | {
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| 97 | factor = xAqm / xAqmDummy;
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| 98 | }
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| 99 | G4XPDGElastic pdg;
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| 100 |
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| 101 | sigma = pdg.CrossSection(piTrk,pTrk);
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| 102 | sigma = sigma * factor;
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| 103 | }
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| 104 |
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| 105 | return sigma;
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| 106 | }
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| 107 |
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| 108 |
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| 109 | G4String G4XMesonBaryonElastic::Name() const
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| 110 | {
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| 111 | G4String name("MesonBaryonElasticCrossSection");
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| 112 | return name;
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| 113 | }
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| 114 |
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| 115 |
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| 116 |
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| 117 | G4bool G4XMesonBaryonElastic::IsValid(G4double e) const
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| 118 | {
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| 119 | G4bool answer = InLimits(e,lowLimit,highLimit);
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| 120 |
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| 121 | return answer;
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| 122 | }
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