[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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| 27 | // $Id: G4PomeronCrossSection.cc,v 1.6 2006/11/07 12:51:39 gunter Exp $ |
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[962] | 28 | // GEANT4 tag $Name: geant4-09-02-ref-02 $ |
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[819] | 29 | // |
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| 30 | |
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| 31 | #include "G4PomeronCrossSection.hh" |
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| 32 | |
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| 33 | G4PomeronCrossSection::G4PomeronCrossSection() |
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| 34 | {;} |
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| 35 | |
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| 36 | |
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| 37 | G4PomeronCrossSection::~G4PomeronCrossSection() |
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| 38 | {;} |
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| 39 | //********************************************************************************************** |
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| 40 | |
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| 41 | G4PomeronCrossSection::G4PomeronCrossSection(const G4ParticleDefinition * particle) |
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| 42 | { |
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| 43 | G4int Encoding = std::abs(particle->GetPDGEncoding()); |
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| 44 | |
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| 45 | if (std::abs(particle->GetBaryonNumber())!=0) |
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| 46 | InitForNucleon(); |
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| 47 | else if (Encoding/100== 3 || Encoding/10 == 3) |
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| 48 | InitForKaon(); |
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| 49 | else |
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| 50 | InitForPion(); |
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| 51 | } |
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| 52 | |
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| 53 | //********************************************************************************************** |
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| 54 | |
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| 55 | G4PomeronCrossSection::G4PomeronCrossSection(const G4Proton * ) |
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| 56 | { |
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| 57 | InitForNucleon(); |
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| 58 | } |
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| 59 | G4PomeronCrossSection::G4PomeronCrossSection(const G4Neutron * ) |
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| 60 | { |
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| 61 | InitForNucleon(); |
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| 62 | } |
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| 63 | |
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| 64 | G4PomeronCrossSection::G4PomeronCrossSection(const G4PionPlus * ) |
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| 65 | { |
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| 66 | InitForPion(); |
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| 67 | } |
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| 68 | G4PomeronCrossSection::G4PomeronCrossSection(const G4PionMinus * ) |
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| 69 | { |
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| 70 | InitForPion(); |
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| 71 | } |
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| 72 | G4PomeronCrossSection::G4PomeronCrossSection(const G4PionZero * ) |
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| 73 | { |
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| 74 | InitForPion(); |
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| 75 | } |
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| 76 | |
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| 77 | G4PomeronCrossSection::G4PomeronCrossSection(const G4KaonPlus * ) |
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| 78 | { |
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| 79 | InitForKaon(); |
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| 80 | } |
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| 81 | G4PomeronCrossSection::G4PomeronCrossSection(const G4KaonMinus * ) |
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| 82 | { |
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| 83 | InitForKaon(); |
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| 84 | } |
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| 85 | G4PomeronCrossSection::G4PomeronCrossSection(const G4KaonZero * ) |
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| 86 | { |
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| 87 | InitForKaon(); |
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| 88 | } |
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| 89 | G4PomeronCrossSection::G4PomeronCrossSection(const G4KaonZeroLong * ) |
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| 90 | { |
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| 91 | InitForKaon(); |
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| 92 | } |
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| 93 | G4PomeronCrossSection::G4PomeronCrossSection(const G4KaonZeroShort * ) |
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| 94 | { |
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| 95 | InitForKaon(); |
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| 96 | } |
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| 97 | G4PomeronCrossSection::G4PomeronCrossSection(const G4Gamma * ) |
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| 98 | { |
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| 99 | InitForGamma(); |
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| 100 | } |
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| 101 | |
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| 102 | G4double G4PomeronCrossSection::GetTotalCrossSection(const G4double s) |
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| 103 | { |
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| 104 | G4double FZ2= Expand(Z(s)/2); |
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| 105 | return SigP(s) * FZ2; |
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| 106 | } |
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| 107 | |
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| 108 | |
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| 109 | G4double G4PomeronCrossSection::GetElasticCrossSection(const G4double s) |
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| 110 | { |
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| 111 | return SigP(s)/pomeron_C *(Expand(Z(s)/2) - Expand(Z(s))); |
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| 112 | } |
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| 113 | |
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| 114 | G4double G4PomeronCrossSection::GetDiffractiveCrossSection(const G4double s) |
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| 115 | { |
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| 116 | return ( pomeron_C -1) * GetElasticCrossSection(s); |
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| 117 | } |
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| 118 | |
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| 119 | G4double G4PomeronCrossSection::GetInelasticCrossSection(const G4double s) |
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| 120 | { |
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| 121 | return GetTotalCrossSection(s) - GetElasticCrossSection(s); |
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| 122 | } |
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| 123 | |
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| 124 | //-------------------------Probabilities ---------------------------- |
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| 125 | |
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| 126 | G4double G4PomeronCrossSection::GetTotalProbability(const G4double s, |
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| 127 | const G4double impactsquare) |
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| 128 | { |
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| 129 | return 2/pomeron_C*(1-std::exp(-1*Eikonal(s,impactsquare))); |
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| 130 | } |
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| 131 | |
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| 132 | G4double G4PomeronCrossSection::GetDiffractiveProbability(const G4double s, |
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| 133 | const G4double impactsquare) |
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| 134 | { |
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| 135 | return (pomeron_C-1)/pomeron_C * |
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| 136 | (GetTotalProbability(s,impactsquare) - |
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| 137 | GetNondiffractiveProbability(s,impactsquare)); |
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| 138 | } |
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| 139 | |
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| 140 | G4double G4PomeronCrossSection::GetNondiffractiveProbability(const G4double s, |
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| 141 | const G4double impactsquare) |
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| 142 | { |
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| 143 | return (1-std::exp(-2*Eikonal(s,impactsquare)))/pomeron_C; |
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| 144 | } |
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| 145 | |
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| 146 | G4double G4PomeronCrossSection::GetElasticProbability(const G4double s, |
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| 147 | const G4double impactsquare) |
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| 148 | { |
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| 149 | return (GetTotalProbability(s,impactsquare) - |
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| 150 | GetInelasticProbability(s,impactsquare)); |
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| 151 | } |
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| 152 | |
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| 153 | G4double G4PomeronCrossSection::GetInelasticProbability(const G4double s, |
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| 154 | const G4double impactsquare) |
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| 155 | { |
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| 156 | return GetNondiffractiveProbability(s,impactsquare) + |
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| 157 | GetDiffractiveProbability(s,impactsquare); |
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| 158 | } |
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| 159 | |
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| 160 | G4double G4PomeronCrossSection::GetCutPomeronProbability(const G4double s, |
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| 161 | const G4double impactsquare, const G4int nPomerons) |
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| 162 | { |
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| 163 | G4double factorial=1; |
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| 164 | for (G4int i=2; i<= nPomerons ; i++) |
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| 165 | { factorial *= i; |
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| 166 | } |
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| 167 | |
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| 168 | return std::exp(-2*Eikonal(s,impactsquare))/pomeron_C* |
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| 169 | std::pow(2*Eikonal(s,impactsquare),nPomerons)/factorial; |
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| 170 | } |
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| 171 | |
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| 172 | // ---------------Temporary --- GF |
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| 173 | void G4PomeronCrossSection::Setgamma(const G4double agam) |
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| 174 | { |
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| 175 | pomeron_Gamma=agam/GeV/GeV; |
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| 176 | } |
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| 177 | |
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| 178 | |
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| 179 | //----------------- private/Implementation methods |
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| 180 | |
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| 181 | void G4PomeronCrossSection::InitForNucleon() |
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| 182 | { |
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| 183 | // pomeron_S= 3.0*GeV*GeV; |
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| 184 | pomeron_S= 2.7*GeV*GeV; |
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| 185 | // pomeron_Gamma= 2.16/GeV/GeV; |
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| 186 | // pomeron_Gamma= 3.96/GeV/GeV; |
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| 187 | pomeron_Gamma= (2.6+3.96)/GeV/GeV; |
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| 188 | pomeron_C= 1.4; |
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| 189 | pomeron_Rsquare= 3.56/GeV/GeV; |
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| 190 | // pomeron_Alpha= 1.0808; |
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| 191 | pomeron_Alpha= 0.9808; |
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| 192 | pomeron_Alphaprime= 0.25/GeV/GeV; |
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| 193 | pomeron_Gamma_Hard = 0.0002/GeV/GeV; // Note! if pomeron_Gamma_Hard != 0 to fit total pp-crosscection |
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| 194 | // pomeron_Gamma_Soft shold be 2.35/GeV/GeV |
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| 195 | pomeron_Alpha_Hard = 1.47; |
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| 196 | } |
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| 197 | |
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| 198 | void G4PomeronCrossSection::InitForPion() |
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| 199 | { |
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| 200 | pomeron_S= 1.5*GeV*GeV; |
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| 201 | // pomeron_Gamma= 1.46/GeV/GeV; |
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| 202 | pomeron_Gamma= 2.17/GeV/GeV; |
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| 203 | pomeron_C= 1.6; |
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| 204 | pomeron_Rsquare= 2.36/GeV/GeV; |
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| 205 | pomeron_Alpha= 1.0808; |
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| 206 | pomeron_Alphaprime= 0.25/GeV/GeV; |
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| 207 | pomeron_Gamma_Hard = 0.0002/GeV/GeV; |
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| 208 | pomeron_Alpha_Hard = 1.47; |
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| 209 | } |
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| 210 | |
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| 211 | void G4PomeronCrossSection::InitForKaon() |
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| 212 | { |
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| 213 | pomeron_S= 2.3*GeV*GeV; |
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| 214 | // pomeron_Gamma= 1.31/GeV/GeV; |
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| 215 | pomeron_Gamma= 1.92/GeV/GeV; |
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| 216 | pomeron_C= 1.8; |
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| 217 | pomeron_Rsquare= 1.96/GeV/GeV; |
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| 218 | pomeron_Alpha= 1.0808; |
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| 219 | pomeron_Alphaprime= 0.25/GeV/GeV; |
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| 220 | pomeron_Gamma_Hard = 0.0002/GeV/GeV; |
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| 221 | pomeron_Alpha_Hard = 1.47; |
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| 222 | } |
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| 223 | |
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| 224 | void G4PomeronCrossSection::InitForGamma() |
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| 225 | { |
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| 226 | pomeron_S= 1.7*GeV*GeV; |
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| 227 | // pomeron_Gamma= 1.42/GeV/GeV; |
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| 228 | pomeron_Gamma= 2.07/GeV/GeV; |
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| 229 | pomeron_C= 1.7; |
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| 230 | pomeron_Rsquare= 2.16/GeV/GeV; |
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| 231 | pomeron_Alpha= 1.0808; |
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| 232 | pomeron_Alphaprime= 0.25/GeV/GeV; |
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| 233 | pomeron_Gamma_Hard = 0.0002/GeV/GeV; |
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| 234 | pomeron_Alpha_Hard = 1.47; |
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| 235 | } |
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| 236 | |
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| 237 | G4double G4PomeronCrossSection::Expand(G4double z) |
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| 238 | { |
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| 239 | |
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| 240 | G4double sum=1.; |
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| 241 | G4double current=1.; |
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| 242 | for (G4int j=2; j<21; j++ ) |
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| 243 | { |
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| 244 | current *= -z *(j-1)/sqr(j); |
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| 245 | sum+=current; |
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| 246 | } |
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| 247 | return sum; |
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| 248 | } |
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| 249 | |
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| 250 | inline G4double G4PomeronCrossSection::Power(const G4double s) |
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| 251 | { |
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| 252 | return pomeron_Gamma *std::pow(s/pomeron_S, pomeron_Alpha -1); |
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| 253 | } |
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| 254 | |
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| 255 | inline G4double G4PomeronCrossSection::Z(const G4double s) |
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| 256 | { |
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| 257 | return 2*pomeron_C * Power(s) / Lambda(s); |
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| 258 | } |
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| 259 | |
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| 260 | inline G4double G4PomeronCrossSection::Lambda(const G4double s) |
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| 261 | { |
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| 262 | return pomeron_Rsquare+pomeron_Alphaprime*std::log(s/pomeron_S); |
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| 263 | } |
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| 264 | |
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| 265 | inline G4double G4PomeronCrossSection::SigP(const G4double s) |
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| 266 | { |
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| 267 | return 8 * pi * hbarc_squared * Power(s); |
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| 268 | } |
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| 269 | |
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| 270 | inline G4double G4PomeronCrossSection::Eikonal(const G4double s, |
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| 271 | const G4double impactsquare) |
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| 272 | { |
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| 273 | return Z(s)/2 * std::exp(-impactsquare/(4*Lambda(s)*hbarc_squared)); |
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| 274 | } |
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| 275 | //************************************************************************************************* |
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| 276 | inline G4double G4PomeronCrossSection::PowerSoft(const G4double s) |
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| 277 | { |
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| 278 | return pomeron_Gamma *std::pow(s/pomeron_S, pomeron_Alpha -1); |
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| 279 | } |
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| 280 | |
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| 281 | inline G4double G4PomeronCrossSection::PowerHard(const G4double s) |
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| 282 | { |
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| 283 | return pomeron_Gamma_Hard*std::pow(s/pomeron_S, pomeron_Alpha_Hard -1); |
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| 284 | } |
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| 285 | |
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| 286 | inline G4double G4PomeronCrossSection::LambdaSoft(const G4double s) |
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| 287 | { |
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| 288 | return pomeron_Rsquare+pomeron_Alphaprime*std::log(s/pomeron_S); |
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| 289 | } |
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| 290 | |
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| 291 | inline G4double G4PomeronCrossSection::LambdaHard(const G4double /*s*/) |
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| 292 | { |
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| 293 | return pomeron_Rsquare; //+pomeron_Alphaprime*std::log(s/pomeron_S); |
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| 294 | } |
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| 295 | |
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| 296 | inline G4double G4PomeronCrossSection::Zsoft(const G4double s) |
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| 297 | { |
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| 298 | return 2*pomeron_C*PowerHard(s) / LambdaSoft(s); |
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| 299 | } |
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| 300 | |
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| 301 | inline G4double G4PomeronCrossSection::Zhard(const G4double s) |
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| 302 | { |
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| 303 | return 2*pomeron_C*PowerHard(s)/LambdaHard(s); |
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| 304 | } |
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| 305 | |
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| 306 | G4double G4PomeronCrossSection::SoftEikonal(G4double s, G4double impactsquare) |
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| 307 | { |
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| 308 | return Zsoft(s)/2*std::exp(-impactsquare/LambdaSoft(s)/hbarc_squared/4); |
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| 309 | } |
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| 310 | |
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| 311 | G4double G4PomeronCrossSection::HardEikonal(G4double s, G4double impactsquare) |
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| 312 | { |
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| 313 | return Zhard(s)/2*std::exp(-impactsquare/LambdaHard(s)/hbarc_squared/4); |
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| 314 | } |
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| 315 | |
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| 316 | //************************************************************************************************* |
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