| 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 | // GEANT4 Class file
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| 29 | //
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| 30 | // For information related to this code contact:
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| 31 | //
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| 32 | // File name: G4XAqmTotal
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| 33 | //
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| 34 | // Author:
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| 35 | //
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| 36 | // Creation date: 15 April 1999
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| 37 | //
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| 38 | // Modifications:
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| 39 | //
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| 40 | // Additive Quark Model total cross section
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| 41 | // (H.J. Lipkin and F. Scheck, Phys.Rev. 16 (1966) 71
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| 42 | //
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| 43 | // -------------------------------------------------------------------
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| 44 |
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| 45 | #include "globals.hh"
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| 46 | #include "G4ios.hh"
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| 47 | #include "G4XAqmTotal.hh"
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| 48 | #include "G4KineticTrack.hh"
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| 49 | #include "G4ParticleDefinition.hh"
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| 50 |
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| 51 |
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| 52 | // Validity range of this cross-section
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| 53 | const G4double G4XAqmTotal::_lowLimit = 0.;
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| 54 | const G4double G4XAqmTotal::_highLimit = DBL_MAX;
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| 55 |
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| 56 | G4XAqmTotal::G4XAqmTotal()
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| 57 | {
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| 58 | // As a first approximation the model is assumed to be valid over
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| 59 | // the entire energy range
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| 60 | }
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| 61 |
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| 62 |
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| 63 | G4XAqmTotal::~G4XAqmTotal()
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| 64 | { }
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| 65 |
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| 66 |
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| 67 | G4bool G4XAqmTotal::operator==(const G4XAqmTotal &right) const
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| 68 | {
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| 69 | return (this == (G4XAqmTotal *) &right);
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| 70 | }
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| 71 |
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| 72 |
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| 73 | G4bool G4XAqmTotal::operator!=(const G4XAqmTotal &right) const
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| 74 | {
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| 75 | return (this != (G4XAqmTotal *) &right);
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| 76 | }
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| 77 |
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| 78 |
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| 79 | G4double G4XAqmTotal::CrossSection(const G4KineticTrack& trk1, const G4KineticTrack& trk2) const
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| 80 | {
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| 81 | G4double sigma = 0.;
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| 82 |
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| 83 | // Get strangeness content
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| 84 | G4ParticleDefinition* def1 = trk1.GetDefinition();
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| 85 | G4int sTrk1 = def1->GetQuarkContent(3) + def1->GetAntiQuarkContent(3);
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| 86 | G4ParticleDefinition* def2 = trk2.GetDefinition();
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| 87 | G4int sTrk2 = def2->GetQuarkContent(3) + def2->GetAntiQuarkContent(3);
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| 88 |
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| 89 | // Get non-strange quark content
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| 90 | G4int qTrk1 = def1->GetQuarkContent(1) + def1->GetAntiQuarkContent(1) +
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| 91 | def1->GetQuarkContent(2) + def1->GetAntiQuarkContent(2) +
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| 92 | def1->GetQuarkContent(4) + def1->GetAntiQuarkContent(4) +
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| 93 | def1->GetQuarkContent(5) + def1->GetAntiQuarkContent(5) +
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| 94 | def1->GetQuarkContent(6) + def1->GetAntiQuarkContent(6);
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| 95 |
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| 96 | G4int qTrk2 = def2->GetQuarkContent(1) + def2->GetAntiQuarkContent(1) +
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| 97 | def2->GetQuarkContent(2) + def2->GetAntiQuarkContent(2) +
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| 98 | def2->GetQuarkContent(4) + def2->GetAntiQuarkContent(4) +
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| 99 | def2->GetQuarkContent(5) + def2->GetAntiQuarkContent(5) +
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| 100 | def2->GetQuarkContent(6) + def2->GetAntiQuarkContent(6);
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| 101 |
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| 102 | G4double sRatio1 = 0.;
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| 103 | if (qTrk1 != 0) sRatio1 = sTrk1 / qTrk1;
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| 104 |
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| 105 | G4double sRatio2 = 0.;
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| 106 | if (qTrk2 != 0) sRatio2 = sTrk2 / qTrk2;
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| 107 |
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| 108 | // Calculate the number of colliding mesons
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| 109 | G4int nMesons = 0;
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| 110 | G4int nQ1 = sTrk1 + qTrk1;
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| 111 |
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| 112 | if (nQ1 == 2) nMesons++;
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| 113 | G4int nQ2 = sTrk2 + qTrk2;
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| 114 | if (nQ2 == 2) nMesons++;
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| 115 |
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| 116 | // Cross-section (units to be checked!)
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| 117 | sigma = 40. * std::pow((2.0/3.0),nMesons) * (1. - 0.4 * sRatio1) * (1. - 0.4 * sRatio2) * millibarn;
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| 118 |
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| 119 | return sigma;
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| 120 | }
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| 121 |
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| 122 |
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| 123 | G4String G4XAqmTotal::Name() const
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| 124 | {
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| 125 | G4String name("AqmTotalCrossSection");
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| 126 | return name;
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| 127 | }
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| 128 |
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| 129 |
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| 130 |
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| 131 | G4bool G4XAqmTotal::IsValid(G4double e) const
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| 132 | {
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| 133 | G4bool answer = InLimits(e,_lowLimit,_highLimit);
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| 134 |
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| 135 | return answer;
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| 136 | }
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