[819] | 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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[1228] | 27 | // $Id: G4XPDGElastic.cc,v 1.3.2.1 2009/11/20 16:25:08 gunter Exp $ // |
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[819] | 28 | // ------------------------------------------------------------------- |
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| 29 | // |
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| 30 | // PDG Elastic cross section |
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| 31 | // PDG fits, Phys.Rev. D50 (1994), 1335 |
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| 32 | // |
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| 33 | // |
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| 34 | // ------------------------------------------------------------------- |
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| 35 | |
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| 36 | #include "globals.hh" |
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| 37 | #include "G4ios.hh" |
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| 38 | #include "G4XPDGElastic.hh" |
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| 39 | #include "G4KineticTrack.hh" |
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| 40 | #include "G4ParticleDefinition.hh" |
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| 41 | #include "G4DataVector.hh" |
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| 42 | |
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| 43 | #include "G4AntiProton.hh" |
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| 44 | #include "G4AntiNeutron.hh" |
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| 45 | #include "G4Proton.hh" |
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| 46 | #include "G4Neutron.hh" |
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| 47 | #include "G4PionPlus.hh" |
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| 48 | #include "G4PionMinus.hh" |
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| 49 | #include "G4KaonMinus.hh" |
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| 50 | #include "G4KaonPlus.hh" |
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| 51 | |
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| 52 | const G4double G4XPDGElastic::_lowLimit = 5. * GeV; |
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| 53 | const G4double G4XPDGElastic::_highLimit = DBL_MAX; |
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| 54 | |
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| 55 | // Parameters of the PDG Elastic cross-section fit (Rev. Particle Properties, 1998) |
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| 56 | // Columns are: lower and higher fit range, X, Y1, Y2 |
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| 57 | const G4int G4XPDGElastic::nPar = 7; |
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| 58 | // p pi+ |
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| 59 | const G4double G4XPDGElastic::pPiPlusPDGFit[7] = { 2., 200., 0., 11.4, -0.4, 0.079, 0. }; |
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| 60 | // p pi- |
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| 61 | const G4double G4XPDGElastic::pPiMinusPDGFit[7] = { 2., 360., 1.76, 11.2, -0.64, 0.043, 0. }; |
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| 62 | // p K+ |
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| 63 | const G4double G4XPDGElastic::pKPlusPDGFit[7] = { 2., 175., 5.0, 8.1, -1.8, 0.16, -1.3 }; |
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| 64 | // p K- |
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| 65 | const G4double G4XPDGElastic::pKMinusPDGFit[7] = { 2., 175., 7.3, 0., 0., 0.29, -2.40 }; |
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| 66 | // p p |
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| 67 | const G4double G4XPDGElastic::ppPDGFit[7] = { 2., 2100., 11.9, 26.9, -1.21, 0.169, -1.85 }; |
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| 68 | // p pbar |
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| 69 | const G4double G4XPDGElastic::ppbarPDGFit[7] = { 5., 1730000., 10.2, 52.7, -1.16, 0.125, -1.28 }; |
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| 70 | // n pbar |
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| 71 | const G4double G4XPDGElastic::npbarPDGFit[7] = { 1.1, 5.55, 36.5, 0., 0., 0., -11.9 }; |
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| 72 | |
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| 73 | |
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| 74 | G4XPDGElastic::G4XPDGElastic() |
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| 75 | { |
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[1228] | 76 | G4ParticleDefinition * proton = G4Proton::ProtonDefinition(); |
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| 77 | G4ParticleDefinition * neutron = G4Neutron::NeutronDefinition(); |
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| 78 | G4ParticleDefinition * piPlus = G4PionPlus::PionPlusDefinition(); |
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| 79 | G4ParticleDefinition * piMinus = G4PionMinus::PionMinusDefinition(); |
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| 80 | G4ParticleDefinition * KPlus = G4KaonPlus::KaonPlusDefinition(); |
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| 81 | G4ParticleDefinition * KMinus = G4KaonMinus::KaonMinusDefinition(); |
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| 82 | G4ParticleDefinition * antiproton = G4AntiProton::AntiProtonDefinition(); |
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[819] | 83 | |
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[1228] | 84 | std::pair<G4ParticleDefinition *,G4ParticleDefinition *> pp(proton,proton); |
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| 85 | std::pair<G4ParticleDefinition *,G4ParticleDefinition *> pn(proton,neutron); |
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| 86 | std::pair<G4ParticleDefinition *,G4ParticleDefinition *> piPlusp(piPlus,proton); |
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| 87 | std::pair<G4ParticleDefinition *,G4ParticleDefinition *> piMinusp(piMinus,proton); |
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| 88 | std::pair<G4ParticleDefinition *,G4ParticleDefinition *> KPlusp(KPlus,proton); |
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| 89 | std::pair<G4ParticleDefinition *,G4ParticleDefinition *> KMinusp(KMinus,proton); |
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| 90 | std::pair<G4ParticleDefinition *,G4ParticleDefinition *> nn(neutron,neutron); |
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| 91 | std::pair<G4ParticleDefinition *,G4ParticleDefinition *> ppbar(proton,antiproton); |
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| 92 | std::pair<G4ParticleDefinition *,G4ParticleDefinition *> npbar(antiproton,neutron); |
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[819] | 93 | |
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| 94 | std::vector<G4double> ppData; |
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| 95 | std::vector<G4double> pPiPlusData; |
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| 96 | std::vector<G4double> pPiMinusData; |
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| 97 | std::vector<G4double> pKPlusData; |
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| 98 | std::vector<G4double> pKMinusData; |
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| 99 | std::vector<G4double> ppbarData; |
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| 100 | std::vector<G4double> npbarData; |
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| 101 | |
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| 102 | G4int i; |
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| 103 | for (i=0; i<2; i++) |
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| 104 | { |
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| 105 | ppData.push_back(ppPDGFit[i] * GeV); |
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| 106 | pPiPlusData.push_back(pPiPlusPDGFit[i] * GeV); |
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| 107 | pPiMinusData.push_back(pPiMinusPDGFit[i] * GeV); |
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| 108 | pKPlusData.push_back(pKPlusPDGFit[i] * GeV); |
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| 109 | pKMinusData.push_back(pKMinusPDGFit[i] * GeV); |
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| 110 | ppbarData.push_back(ppbarPDGFit[i] * GeV); |
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| 111 | npbarData.push_back(npbarPDGFit[i] * GeV); |
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| 112 | } |
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| 113 | |
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| 114 | for (i=2; i<nPar; i++) |
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| 115 | { |
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| 116 | ppData.push_back(ppPDGFit[i]); |
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| 117 | pPiPlusData.push_back(pPiPlusPDGFit[i]); |
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| 118 | pPiMinusData.push_back(pPiMinusPDGFit[i]); |
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| 119 | pKPlusData.push_back(pKPlusPDGFit[i]); |
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| 120 | pKMinusData.push_back(pKMinusPDGFit[i]); |
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| 121 | ppbarData.push_back(ppbarPDGFit[i]); |
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| 122 | npbarData.push_back(npbarPDGFit[i]); |
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| 123 | } |
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| 124 | |
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| 125 | xMap[nn] = ppData; |
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| 126 | xMap[pp] = ppData; |
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| 127 | xMap[pn] = ppData; |
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| 128 | xMap[piPlusp] = pPiPlusData; |
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| 129 | xMap[piMinusp] = pPiMinusData; |
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| 130 | xMap[KPlusp] = pKPlusData; |
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| 131 | xMap[KMinusp] = pKMinusData; |
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| 132 | xMap[ppbar] = ppbarData; |
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| 133 | xMap[npbar] = npbarData; |
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| 134 | } |
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| 135 | |
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| 136 | |
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| 137 | G4XPDGElastic::~G4XPDGElastic() |
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| 138 | { } |
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| 139 | |
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| 140 | |
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| 141 | G4bool G4XPDGElastic::operator==(const G4XPDGElastic &right) const |
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| 142 | { |
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| 143 | return (this == (G4XPDGElastic *) &right); |
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| 144 | } |
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| 145 | |
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| 146 | |
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| 147 | G4bool G4XPDGElastic::operator!=(const G4XPDGElastic &right) const |
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| 148 | { |
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| 149 | return (this != (G4XPDGElastic *) &right); |
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| 150 | } |
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| 151 | |
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| 152 | |
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| 153 | G4double G4XPDGElastic::CrossSection(const G4KineticTrack& trk1, const G4KineticTrack& trk2) const |
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| 154 | { |
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| 155 | // Elastic Cross-section fit, 1994 Review of Particle Properties, (1994), 1 |
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| 156 | |
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| 157 | G4double sigma = 0.; |
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| 158 | |
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| 159 | G4ParticleDefinition* def1 = trk1.GetDefinition(); |
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| 160 | G4ParticleDefinition* def2 = trk2.GetDefinition(); |
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| 161 | |
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| 162 | G4double sqrtS = (trk1.Get4Momentum() + trk2.Get4Momentum()).mag(); |
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| 163 | G4double m1 = def1->GetPDGMass(); |
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| 164 | G4double m2 = def2->GetPDGMass(); |
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| 165 | G4double m = std::max(m1,m2); |
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| 166 | // if (m1 > m) m = m1; |
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| 167 | |
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| 168 | G4double pLab = 0.; |
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| 169 | |
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| 170 | if (m > 0. && sqrtS > (m1 + m2)) |
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| 171 | { |
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| 172 | pLab = std::sqrt( (sqrtS*sqrtS - (m1+m2)*(m1+m2) ) * (sqrtS*sqrtS - (m1-m2)*(m1-m2)) ) / (2*m); |
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| 173 | |
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| 174 | // The PDG fit formula requires p in GeV/c |
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| 175 | |
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| 176 | G4double enc1 = def1->GetPDGEncoding(); |
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| 177 | G4double enc2 = def2->GetPDGEncoding(); |
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| 178 | G4double coeff = -1.; |
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| 179 | if ( (enc1 < 0 && enc2 >0) || (enc2 < 0 && enc1 >0) ) coeff = 1.; |
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| 180 | |
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| 181 | // Order the pair: first is the lower mass particle, second is the higher mass one |
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[1228] | 182 | std::pair<G4ParticleDefinition *,G4ParticleDefinition *> trkPair(def1,def2); |
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[819] | 183 | if (def1->GetPDGMass() > def2->GetPDGMass()) |
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[1228] | 184 | trkPair = std::pair<G4ParticleDefinition *,G4ParticleDefinition *>(def2,def1); |
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[819] | 185 | |
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| 186 | std::vector<G4double> data; |
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| 187 | G4double pMinFit = 0.; |
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| 188 | G4double pMaxFit = 0.; |
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| 189 | G4double aFit = 0.; |
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| 190 | G4double bFit = 0.; |
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| 191 | G4double cFit = 0.; |
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| 192 | G4double dFit = 0.; |
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| 193 | G4double nFit = 0.; |
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| 194 | |
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| 195 | // Debug |
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| 196 | // G4cout << "Map has " << xMap.size() << " elements" << G4endl; |
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| 197 | // Debug end |
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| 198 | |
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| 199 | if (xMap.find(trkPair) != xMap.end()) |
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| 200 | { |
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| 201 | PairDoubleMap::const_iterator iter; |
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| 202 | for (iter = xMap.begin(); iter != xMap.end(); ++iter) |
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| 203 | { |
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[1228] | 204 | std::pair<G4ParticleDefinition *,G4ParticleDefinition *> thePair = (*iter).first; |
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[819] | 205 | if (thePair == trkPair) |
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| 206 | { |
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| 207 | data = (*iter).second; |
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| 208 | pMinFit = data[0]; |
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| 209 | pMaxFit = data[1]; |
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| 210 | aFit = data[2]; |
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| 211 | bFit = data[3]; |
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| 212 | cFit = data[5]; |
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| 213 | dFit = data[6]; |
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| 214 | nFit = data[4]; |
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| 215 | |
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| 216 | if (pLab < pMinFit) return 0.0; |
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| 217 | if (pLab > pMaxFit ) |
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| 218 | G4cout << "WARNING! G4XPDGElastic::PDGElastic " |
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| 219 | << trk1.GetDefinition()->GetParticleName() << "-" |
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| 220 | << trk2.GetDefinition()->GetParticleName() |
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| 221 | << " elastic cross section: momentum " |
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| 222 | << pLab / GeV << " GeV outside valid fit range " |
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| 223 | << pMinFit /GeV << "-" << pMaxFit / GeV |
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| 224 | << G4endl; |
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| 225 | |
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| 226 | pLab /= GeV; |
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| 227 | if (pLab > 0.) |
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| 228 | { |
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| 229 | G4double logP = std::log(pLab); |
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| 230 | sigma = aFit + bFit * std::pow(pLab, nFit) + cFit * logP*logP + dFit * logP; |
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| 231 | sigma = sigma * millibarn; |
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| 232 | } |
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| 233 | } |
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| 234 | } |
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| 235 | } |
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| 236 | else |
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| 237 | { |
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| 238 | G4cout << "G4XPDGElastic::CrossSection - Data not found in Map" << G4endl; |
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| 239 | } |
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| 240 | } |
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| 241 | |
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| 242 | if (sigma < 0.) |
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| 243 | { |
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| 244 | G4cout << "WARNING! G4XPDGElastic::PDGElastic " |
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[1228] | 245 | << def1->GetParticleName() << "-" << def2->GetParticleName() |
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[819] | 246 | << " elastic cross section: momentum " |
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| 247 | << pLab << " GeV, negative cross section " |
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| 248 | << sigma / millibarn << " mb set to 0" << G4endl; |
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| 249 | sigma = 0.; |
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| 250 | } |
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| 251 | |
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| 252 | return sigma; |
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| 253 | } |
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| 254 | |
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| 255 | |
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| 256 | G4String G4XPDGElastic::Name() const |
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| 257 | { |
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| 258 | G4String name = "PDGElastic "; |
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| 259 | return name; |
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| 260 | } |
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| 261 | |
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| 262 | |
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| 263 | G4bool G4XPDGElastic::IsValid(G4double e) const |
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| 264 | { |
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| 265 | G4bool answer = InLimits(e,_lowLimit,_highLimit); |
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| 266 | |
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| 267 | return answer; |
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| 268 | } |
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