[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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[1196] | 27 | // $Id: G4VLongitudinalStringDecay.cc,v 1.18 2009/08/03 13:21:25 vuzhinsk Exp $ |
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[1228] | 28 | // GEANT4 tag $Name: geant4-09-03 $ |
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[819] | 29 | // |
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| 30 | // ----------------------------------------------------------------------------- |
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| 31 | // GEANT 4 class implementation file |
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| 32 | // |
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| 33 | // History: first implementation, Maxim Komogorov, 1-Jul-1998 |
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| 34 | // redesign Gunter Folger, August/September 2001 |
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| 35 | // ----------------------------------------------------------------------------- |
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| 36 | #include "G4ios.hh" |
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| 37 | #include "Randomize.hh" |
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| 38 | #include "G4VLongitudinalStringDecay.hh" |
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| 39 | #include "G4FragmentingString.hh" |
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| 40 | |
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| 41 | #include "G4ParticleDefinition.hh" |
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| 42 | #include "G4ParticleTypes.hh" |
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| 43 | #include "G4ParticleChange.hh" |
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| 44 | #include "G4VShortLivedParticle.hh" |
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| 45 | #include "G4ShortLivedConstructor.hh" |
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| 46 | #include "G4ParticleTable.hh" |
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| 47 | #include "G4ShortLivedTable.hh" |
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| 48 | #include "G4PhaseSpaceDecayChannel.hh" |
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| 49 | #include "G4VDecayChannel.hh" |
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| 50 | #include "G4DecayTable.hh" |
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| 51 | |
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| 52 | #include "G4DiQuarks.hh" |
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| 53 | #include "G4Quarks.hh" |
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| 54 | #include "G4Gluons.hh" |
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| 55 | |
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| 56 | //------------------------debug switches |
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| 57 | //#define DEBUG_LightFragmentationTest 1 |
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| 58 | |
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| 59 | |
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| 60 | //******************************************************************************** |
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| 61 | // Constructors |
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| 62 | |
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| 63 | G4VLongitudinalStringDecay::G4VLongitudinalStringDecay() |
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| 64 | { |
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| 65 | MassCut = 0.35*GeV; |
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| 66 | ClusterMass = 0.15*GeV; |
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| 67 | |
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| 68 | SmoothParam = 0.9; |
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| 69 | StringLoopInterrupt = 1000; |
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| 70 | ClusterLoopInterrupt = 500; |
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| 71 | |
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| 72 | // Changable Parameters below. |
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| 73 | SigmaQT = 0.5 * GeV; |
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| 74 | |
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| 75 | StrangeSuppress = 0.44; // 27 % strange quarks produced, ie. u:d:s=1:1:0.27 |
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[962] | 76 | DiquarkSuppress = 0.07; |
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[819] | 77 | DiquarkBreakProb = 0.1; |
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| 78 | |
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| 79 | //... pspin_meson is probability to create vector meson |
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| 80 | pspin_meson = 0.5; |
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| 81 | |
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| 82 | //... pspin_barion is probability to create 3/2 barion |
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| 83 | pspin_barion = 0.5; |
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| 84 | |
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| 85 | //... vectorMesonMix[] is quark mixing parameters for vector mesons (Variable spin = 3) |
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| 86 | vectorMesonMix.resize(6); |
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| 87 | vectorMesonMix[0] = 0.5; |
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| 88 | vectorMesonMix[1] = 0.0; |
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| 89 | vectorMesonMix[2] = 0.5; |
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| 90 | vectorMesonMix[3] = 0.0; |
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| 91 | vectorMesonMix[4] = 1.0; |
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| 92 | vectorMesonMix[5] = 1.0; |
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| 93 | |
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| 94 | //... scalarMesonMix[] is quark mixing parameters for scalar mesons (Variable spin=1) |
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| 95 | scalarMesonMix.resize(6); |
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| 96 | scalarMesonMix[0] = 0.5; |
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| 97 | scalarMesonMix[1] = 0.25; |
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| 98 | scalarMesonMix[2] = 0.5; |
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| 99 | scalarMesonMix[3] = 0.25; |
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| 100 | scalarMesonMix[4] = 1.0; |
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| 101 | scalarMesonMix[5] = 0.5; |
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| 102 | |
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| 103 | // Parameters may be changed until the first fragmentation starts |
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| 104 | PastInitPhase=false; |
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| 105 | hadronizer = new G4HadronBuilder(pspin_meson,pspin_barion, |
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| 106 | scalarMesonMix,vectorMesonMix); |
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[962] | 107 | Kappa = 1.0 * GeV/fermi; |
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| 108 | |
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| 109 | |
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[819] | 110 | } |
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| 111 | |
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| 112 | |
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| 113 | G4VLongitudinalStringDecay::~G4VLongitudinalStringDecay() |
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| 114 | { |
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| 115 | delete hadronizer; |
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| 116 | } |
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| 117 | |
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[962] | 118 | //============================================================================= |
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[819] | 119 | |
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| 120 | // Operators |
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| 121 | |
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| 122 | //const & G4VLongitudinalStringDecay::operator=(const G4VLongitudinalStringDecay &) |
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| 123 | // { |
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| 124 | // } |
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| 125 | |
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[962] | 126 | //----------------------------------------------------------------------------- |
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[819] | 127 | |
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| 128 | int G4VLongitudinalStringDecay::operator==(const G4VLongitudinalStringDecay &) const |
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| 129 | { |
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| 130 | throw G4HadronicException(__FILE__, __LINE__, "G4VLongitudinalStringDecay::operator== forbidden"); |
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| 131 | return false; |
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| 132 | } |
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| 133 | |
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[962] | 134 | //------------------------------------------------------------------------------------- |
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[819] | 135 | |
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| 136 | int G4VLongitudinalStringDecay::operator!=(const G4VLongitudinalStringDecay &) const |
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| 137 | { |
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| 138 | throw G4HadronicException(__FILE__, __LINE__, "G4VLongitudinalStringDecay::operator!= forbidden"); |
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| 139 | return true; |
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| 140 | } |
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| 141 | |
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[962] | 142 | //*********************************************************************************** |
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[819] | 143 | |
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[962] | 144 | // For changing Mass Cut used for selection of very small mass strings |
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| 145 | void G4VLongitudinalStringDecay::SetMassCut(G4double aValue){MassCut=aValue;} |
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| 146 | |
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| 147 | //----------------------------------------------------------------------------- |
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| 148 | |
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| 149 | // For handling a string with very low mass |
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| 150 | |
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| 151 | G4KineticTrackVector* G4VLongitudinalStringDecay::LightFragmentationTest(const |
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| 152 | G4ExcitedString * const string) |
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| 153 | { |
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| 154 | // Check string decay threshold |
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| 155 | |
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| 156 | G4KineticTrackVector * result=0; // return 0 when string exceeds the mass cut |
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| 157 | |
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| 158 | pDefPair hadrons((G4ParticleDefinition *)0,(G4ParticleDefinition *)0); |
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| 159 | |
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| 160 | G4FragmentingString aString(*string); |
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| 161 | |
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| 162 | if ( sqr(FragmentationMass(&aString,0,&hadrons)+MassCut) < aString.Mass2()) { |
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| 163 | return 0; |
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| 164 | } |
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| 165 | |
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| 166 | // The string mass is very low --------------------------- |
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| 167 | |
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| 168 | result=new G4KineticTrackVector; |
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| 169 | |
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| 170 | if ( hadrons.second ==0 ) |
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| 171 | { |
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| 172 | // Substitute string by light hadron, Note that Energy is not conserved here! |
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| 173 | |
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| 174 | /* |
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| 175 | #ifdef DEBUG_LightFragmentationTest |
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| 176 | G4cout << "VlongSF Warning replacing string by single hadron " <<G4endl; |
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| 177 | G4cout << hadrons.first->GetParticleName() |
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| 178 | << "string .. " << string->Get4Momentum() << " " |
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| 179 | << string->Get4Momentum().m() << G4endl; |
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| 180 | #endif |
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| 181 | G4cout << "VlongSF Warning replacing string by single hadron " <<G4endl; |
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| 182 | G4cout << hadrons.first->GetParticleName() << " string .. " <<G4endl; |
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| 183 | G4cout << string->Get4Momentum() << " " << string->Get4Momentum().m() << G4endl; |
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| 184 | */ |
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| 185 | G4ThreeVector Mom3 = string->Get4Momentum().vect(); |
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| 186 | G4LorentzVector Mom(Mom3, |
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| 187 | std::sqrt(Mom3.mag2() + |
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| 188 | sqr(hadrons.first->GetPDGMass()))); |
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| 189 | result->push_back(new G4KineticTrack(hadrons.first, 0, |
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| 190 | string->GetPosition(), |
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| 191 | Mom)); |
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| 192 | } else |
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| 193 | { |
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| 194 | //... string was qq--qqbar type: Build two stable hadrons, |
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| 195 | |
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| 196 | #ifdef DEBUG_LightFragmentationTest |
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| 197 | G4cout << "VlongSF Warning replacing qq-qqbar string by TWO hadrons " |
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| 198 | << hadrons.first->GetParticleName() << " / " |
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| 199 | << hadrons.second->GetParticleName() |
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| 200 | << "string .. " << string->Get4Momentum() << " " |
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| 201 | << string->Get4Momentum().m() << G4endl; |
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| 202 | #endif |
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| 203 | |
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| 204 | // Uzhi Formation time in the case??? |
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| 205 | |
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| 206 | G4LorentzVector Mom1, Mom2; |
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| 207 | Sample4Momentum(&Mom1, hadrons.first->GetPDGMass(), |
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| 208 | &Mom2,hadrons.second->GetPDGMass(), |
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| 209 | string->Get4Momentum().mag()); |
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| 210 | |
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| 211 | result->push_back(new G4KineticTrack(hadrons.first, 0, |
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| 212 | string->GetPosition(), |
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| 213 | Mom1)); |
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| 214 | result->push_back(new G4KineticTrack(hadrons.second, 0, |
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| 215 | string->GetPosition(), |
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| 216 | Mom2)); |
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| 217 | |
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| 218 | G4ThreeVector Velocity = string->Get4Momentum().boostVector(); |
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| 219 | result->Boost(Velocity); |
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| 220 | } |
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| 221 | |
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| 222 | return result; |
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| 223 | |
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| 224 | } |
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| 225 | |
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| 226 | //---------------------------------------------------------------------------------------- |
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| 227 | |
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| 228 | G4double G4VLongitudinalStringDecay::FragmentationMass( |
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| 229 | const G4FragmentingString * const string, |
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| 230 | Pcreate build, pDefPair * pdefs ) |
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| 231 | { |
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| 232 | |
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| 233 | G4double mass; |
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| 234 | static G4bool NeedInit(true); |
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| 235 | static std::vector<double> nomix; |
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| 236 | static G4HadronBuilder * minMassHadronizer; |
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| 237 | if ( NeedInit ) |
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| 238 | { |
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| 239 | NeedInit = false; |
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| 240 | nomix.resize(6); |
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| 241 | for ( G4int i=0; i<6 ; i++ ) nomix[i]=0; |
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| 242 | |
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| 243 | // minMassHadronizer=new G4HadronBuilder(pspin_meson,pspin_barion,nomix,nomix); |
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| 244 | minMassHadronizer=hadronizer; |
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| 245 | } |
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| 246 | |
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| 247 | if ( build==0 ) build=&G4HadronBuilder::BuildLowSpin; |
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| 248 | |
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| 249 | G4ParticleDefinition *Hadron1, *Hadron2=0; |
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| 250 | |
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| 251 | if (!string->FourQuarkString() ) |
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| 252 | { |
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| 253 | // spin 0 meson or spin 1/2 barion will be built |
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| 254 | |
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| 255 | Hadron1 = (minMassHadronizer->*build)(string->GetLeftParton(), |
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| 256 | string->GetRightParton()); |
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| 257 | mass= (Hadron1)->GetPDGMass(); |
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| 258 | } else |
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| 259 | { |
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| 260 | //... string is qq--qqbar: Build two stable hadrons, |
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| 261 | //... with extra uubar or ddbar quark pair |
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| 262 | G4int iflc = (G4UniformRand() < 0.5)? 1 : 2; |
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| 263 | if (string->GetLeftParton()->GetPDGEncoding() < 0) iflc = -iflc; |
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| 264 | |
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| 265 | //... theSpin = 4; spin 3/2 baryons will be built |
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| 266 | Hadron1 = (minMassHadronizer->*build)(string->GetLeftParton(), |
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| 267 | FindParticle(iflc) ); |
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| 268 | Hadron2 = (minMassHadronizer->*build)(string->GetRightParton(), |
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| 269 | FindParticle(-iflc) ); |
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| 270 | mass = (Hadron1)->GetPDGMass() + (Hadron2)->GetPDGMass(); |
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| 271 | } |
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| 272 | |
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| 273 | if ( pdefs != 0 ) |
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| 274 | { // need to return hadrons as well.... |
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| 275 | pdefs->first = Hadron1; |
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| 276 | pdefs->second = Hadron2; |
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| 277 | } |
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| 278 | |
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| 279 | return mass; |
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| 280 | } |
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| 281 | |
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| 282 | //---------------------------------------------------------------------------- |
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| 283 | |
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| 284 | G4ParticleDefinition* G4VLongitudinalStringDecay::FindParticle(G4int Encoding) |
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| 285 | { |
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| 286 | G4ParticleDefinition* ptr = G4ParticleTable::GetParticleTable()->FindParticle(Encoding); |
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| 287 | if (ptr == NULL) |
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| 288 | { |
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| 289 | G4cout << "Particle with encoding "<<Encoding<<" does not exist!!!"<<G4endl; |
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| 290 | throw G4HadronicException(__FILE__, __LINE__, "Check your particle table"); |
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| 291 | } |
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| 292 | return ptr; |
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| 293 | } |
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| 294 | |
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| 295 | //----------------------------------------------------------------------------- |
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| 296 | // virtual void Sample4Momentum(G4LorentzVector* Mom, G4double Mass, |
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| 297 | // G4LorentzVector* AntiMom, G4double AntiMass, |
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| 298 | // G4double InitialMass)=0; |
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| 299 | //----------------------------------------------------------------------------- |
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| 300 | |
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| 301 | //********************************************************************************* |
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| 302 | // For decision on continue or stop string fragmentation |
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| 303 | // virtual G4bool StopFragmenting(const G4FragmentingString * const string)=0; |
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| 304 | // virtual G4bool IsFragmentable(const G4FragmentingString * const string)=0; |
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| 305 | |
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| 306 | // If a string can not fragment, make last break into 2 hadrons |
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| 307 | // virtual G4bool SplitLast(G4FragmentingString * string, |
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| 308 | // G4KineticTrackVector * LeftVector, |
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| 309 | // G4KineticTrackVector * RightVector)=0; |
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| 310 | //----------------------------------------------------------------------------- |
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| 311 | // |
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| 312 | // If a string fragments, do the following |
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| 313 | // |
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| 314 | // For transver of a string to its CMS frame |
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| 315 | //----------------------------------------------------------------------------- |
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| 316 | |
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| 317 | G4ExcitedString *G4VLongitudinalStringDecay::CPExcited(const G4ExcitedString & in) |
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| 318 | { |
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| 319 | G4Parton *Left=new G4Parton(*in.GetLeftParton()); |
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| 320 | G4Parton *Right=new G4Parton(*in.GetRightParton()); |
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| 321 | return new G4ExcitedString(Left,Right,in.GetDirection()); |
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| 322 | } |
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| 323 | |
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| 324 | //----------------------------------------------------------------------------- |
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| 325 | |
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| 326 | G4KineticTrack * G4VLongitudinalStringDecay::Splitup( |
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| 327 | G4FragmentingString *string, |
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| 328 | G4FragmentingString *&newString) |
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| 329 | { |
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| 330 | //G4cout<<"In G4VLong String Dec######################"<<G4endl; |
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| 331 | |
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| 332 | //... random choice of string end to use for creating the hadron (decay) |
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| 333 | SideOfDecay = (G4UniformRand() < 0.5)? 1: -1; |
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| 334 | if (SideOfDecay < 0) |
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| 335 | { |
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| 336 | string->SetLeftPartonStable(); |
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| 337 | } else |
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| 338 | { |
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| 339 | string->SetRightPartonStable(); |
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| 340 | } |
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| 341 | |
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| 342 | G4ParticleDefinition *newStringEnd; |
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| 343 | G4ParticleDefinition * HadronDefinition; |
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| 344 | if (string->DecayIsQuark()) |
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| 345 | { |
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| 346 | HadronDefinition= QuarkSplitup(string->GetDecayParton(), newStringEnd); |
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| 347 | } else { |
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| 348 | HadronDefinition= DiQuarkSplitup(string->GetDecayParton(), newStringEnd); |
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| 349 | } |
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| 350 | // create new String from old, ie. keep Left and Right order, but replace decay |
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| 351 | |
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| 352 | newString=new G4FragmentingString(*string,newStringEnd); // To store possible |
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| 353 | // quark containt of new string |
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| 354 | G4LorentzVector* HadronMomentum=SplitEandP(HadronDefinition, string, newString); |
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| 355 | |
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| 356 | delete newString; newString=0; // Uzhi 20.06.08 |
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| 357 | |
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| 358 | G4KineticTrack * Hadron =0; |
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| 359 | if ( HadronMomentum != 0 ) { |
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| 360 | |
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| 361 | G4ThreeVector Pos; |
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| 362 | Hadron = new G4KineticTrack(HadronDefinition, 0,Pos, *HadronMomentum); |
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| 363 | |
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| 364 | newString=new G4FragmentingString(*string,newStringEnd, |
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| 365 | HadronMomentum); |
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| 366 | |
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| 367 | //G4cout<<"Out G4VLong String Dec######################"<<G4endl; |
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| 368 | //G4cout<<"newString 4Mom"<<newString->Get4Momentum()<<G4endl; |
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| 369 | //G4cout<<"newString Pl "<<newString->LightConePlus()<<G4endl; |
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| 370 | //G4cout<<"newString Mi "<<newString->LightConeMinus()<<G4endl; |
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| 371 | //G4cout<<"newString Pts "<<newString->StablePt()<<G4endl; |
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| 372 | //G4cout<<"newString Ptd "<<newString->DecayPt()<<G4endl; |
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| 373 | //G4cout<<"newString M2 "<<newString->Mass2()<<G4endl; |
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| 374 | //G4cout<<"newString M2 "<<newString->Mass()<<G4endl; |
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| 375 | delete HadronMomentum; |
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| 376 | } |
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| 377 | return Hadron; |
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| 378 | } |
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| 379 | |
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| 380 | //-------------------------------------------------------------------------------------- |
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| 381 | |
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| 382 | G4ParticleDefinition * |
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| 383 | G4VLongitudinalStringDecay::QuarkSplitup(G4ParticleDefinition* |
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| 384 | decay, G4ParticleDefinition *&created) |
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| 385 | { |
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| 386 | G4int IsParticle=(decay->GetPDGEncoding()>0) ? -1 : +1; // if we have a quark, |
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| 387 | // we need antiquark |
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| 388 | // (or diquark) |
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| 389 | pDefPair QuarkPair = CreatePartonPair(IsParticle); |
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| 390 | created = QuarkPair.second; |
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| 391 | return hadronizer->Build(QuarkPair.first, decay); |
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| 392 | |
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| 393 | } |
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| 394 | |
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| 395 | //----------------------------------------------------------------------------- |
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| 396 | |
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| 397 | G4ParticleDefinition *G4VLongitudinalStringDecay::DiQuarkSplitup( |
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| 398 | G4ParticleDefinition* decay, |
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| 399 | G4ParticleDefinition *&created) |
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| 400 | { |
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| 401 | //... can Diquark break or not? |
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| 402 | if (G4UniformRand() < DiquarkBreakProb ){ |
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| 403 | //... Diquark break |
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| 404 | |
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| 405 | G4int stableQuarkEncoding = decay->GetPDGEncoding()/1000; |
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| 406 | G4int decayQuarkEncoding = (decay->GetPDGEncoding()/100)%10; |
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| 407 | if (G4UniformRand() < 0.5) |
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| 408 | { |
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| 409 | G4int Swap = stableQuarkEncoding; |
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| 410 | stableQuarkEncoding = decayQuarkEncoding; |
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| 411 | decayQuarkEncoding = Swap; |
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| 412 | } |
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| 413 | |
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| 414 | G4int IsParticle=(decayQuarkEncoding>0) ? -1 : +1; |
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| 415 | // if we have a quark, we need antiquark) |
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| 416 | pDefPair QuarkPair = CreatePartonPair(IsParticle,false); // no diquarks wanted |
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| 417 | //... Build new Diquark |
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| 418 | G4int QuarkEncoding=QuarkPair.second->GetPDGEncoding(); |
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| 419 | G4int i10 = std::max(std::abs(QuarkEncoding), std::abs(stableQuarkEncoding)); |
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| 420 | G4int i20 = std::min(std::abs(QuarkEncoding), std::abs(stableQuarkEncoding)); |
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| 421 | G4int spin = (i10 != i20 && G4UniformRand() <= 0.5)? 1 : 3; |
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| 422 | G4int NewDecayEncoding = -1*IsParticle*(i10 * 1000 + i20 * 100 + spin); |
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| 423 | created = FindParticle(NewDecayEncoding); |
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| 424 | G4ParticleDefinition * decayQuark=FindParticle(decayQuarkEncoding); |
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| 425 | G4ParticleDefinition * had=hadronizer->Build(QuarkPair.first, decayQuark); |
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| 426 | return had; |
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| 427 | // return hadronizer->Build(QuarkPair.first, decayQuark); |
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| 428 | |
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| 429 | } else { |
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| 430 | //... Diquark does not break |
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| 431 | |
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| 432 | G4int IsParticle=(decay->GetPDGEncoding()>0) ? +1 : -1; |
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| 433 | // if we have a diquark, we need quark) |
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| 434 | pDefPair QuarkPair = CreatePartonPair(IsParticle,false); // no diquarks wanted |
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| 435 | created = QuarkPair.second; |
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| 436 | |
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| 437 | G4ParticleDefinition * had=hadronizer->Build(QuarkPair.first, decay); |
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| 438 | return had; |
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| 439 | // return G4ParticleDefinition * had=hadronizer->Build(QuarkPair.first, decay); |
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| 440 | } |
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| 441 | } |
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| 442 | |
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| 443 | //----------------------------------------------------------------------------- |
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| 444 | |
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[819] | 445 | G4int G4VLongitudinalStringDecay::SampleQuarkFlavor(void) |
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| 446 | { |
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| 447 | return (1 + (int)(G4UniformRand()/StrangeSuppress)); |
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| 448 | } |
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| 449 | |
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[962] | 450 | //----------------------------------------------------------------------------- |
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[819] | 451 | |
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| 452 | G4VLongitudinalStringDecay::pDefPair G4VLongitudinalStringDecay::CreatePartonPair(G4int NeedParticle,G4bool AllowDiquarks) |
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| 453 | { |
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| 454 | // NeedParticle = +1 for Particle, -1 for Antiparticle |
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| 455 | |
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| 456 | if ( AllowDiquarks && G4UniformRand() < DiquarkSuppress ) |
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| 457 | { |
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| 458 | // Create a Diquark - AntiDiquark pair , first in pair is anti to IsParticle |
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| 459 | G4int q1 = SampleQuarkFlavor(); |
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| 460 | G4int q2 = SampleQuarkFlavor(); |
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| 461 | G4int spin = (q1 != q2 && G4UniformRand() <= 0.5)? 1 : 3; |
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| 462 | // convention: quark with higher PDG number is first |
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| 463 | G4int PDGcode = (std::max(q1,q2) * 1000 + std::min(q1,q2) * 100 + spin) * NeedParticle; |
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| 464 | return pDefPair (FindParticle(-PDGcode),FindParticle(PDGcode)); |
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| 465 | |
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| 466 | |
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| 467 | } else { |
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| 468 | // Create a Quark - AntiQuark pair, first in pair IsParticle |
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| 469 | G4int PDGcode=SampleQuarkFlavor()*NeedParticle; |
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| 470 | return pDefPair (FindParticle(PDGcode),FindParticle(-PDGcode)); |
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| 471 | } |
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| 472 | |
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| 473 | } |
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| 474 | |
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[962] | 475 | //----------------------------------------------------------------------------- |
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[819] | 476 | |
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| 477 | // G4ThreeVector G4VLongitudinalStringDecay::SampleQuarkPt() |
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| 478 | // { |
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| 479 | // G4double width_param= 2.0 * GeV*GeV; |
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| 480 | // G4double R = G4UniformRand(); |
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| 481 | // G4double Pt = std::sqrt(width_param*R/(1-R)); |
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| 482 | // G4double phi = 2.*pi*G4UniformRand(); |
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| 483 | // return G4ThreeVector(Pt * std::cos(phi),Pt * std::sin(phi),0); |
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| 484 | // } |
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[962] | 485 | |
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[1055] | 486 | G4ThreeVector G4VLongitudinalStringDecay::SampleQuarkPt(G4double ptMax) |
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[819] | 487 | { |
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[1055] | 488 | G4double Pt; |
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| 489 | if ( ptMax < 0 ) { |
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| 490 | // sample full gaussian |
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| 491 | Pt = -std::log(G4UniformRand()); |
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| 492 | } else { |
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| 493 | // sample in limited range |
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[1196] | 494 | Pt = -std::log(CLHEP::RandFlat::shoot(std::exp(-sqr(ptMax)/sqr(SigmaQT)), 1.)); |
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[1055] | 495 | } |
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[819] | 496 | Pt = SigmaQT * std::sqrt(Pt); |
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| 497 | G4double phi = 2.*pi*G4UniformRand(); |
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| 498 | return G4ThreeVector(Pt * std::cos(phi),Pt * std::sin(phi),0); |
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| 499 | } |
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| 500 | |
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[962] | 501 | //****************************************************************************** |
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[819] | 502 | |
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| 503 | void G4VLongitudinalStringDecay::CalculateHadronTimePosition(G4double theInitialStringMass, G4KineticTrackVector* Hadrons) |
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| 504 | { |
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[962] | 505 | |
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[1196] | 506 | // `yo-yo` formation time |
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[962] | 507 | // const G4double kappa = 1.0 * GeV/fermi/4.; // Uzhi String tension 1.06.08 |
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| 508 | G4double kappa = GetStringTensionParameter(); |
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| 509 | //G4cout<<"Kappa "<<kappa<<G4endl; // Uzhi 20.06.08 |
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| 510 | //G4int Uzhi; G4cin>>Uzhi; // Uzhi 20.06.08 |
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[1196] | 511 | //G4cout<<"Number of hadrons "<<Hadrons->size()<<G4endl; // Vova |
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[819] | 512 | for(size_t c1 = 0; c1 < Hadrons->size(); c1++) |
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| 513 | { |
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| 514 | G4double SumPz = 0; |
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| 515 | G4double SumE = 0; |
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| 516 | for(size_t c2 = 0; c2 < c1; c2++) |
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| 517 | { |
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| 518 | SumPz += Hadrons->operator[](c2)->Get4Momentum().pz(); |
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| 519 | SumE += Hadrons->operator[](c2)->Get4Momentum().e(); |
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| 520 | } |
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| 521 | G4double HadronE = Hadrons->operator[](c1)->Get4Momentum().e(); |
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| 522 | G4double HadronPz = Hadrons->operator[](c1)->Get4Momentum().pz(); |
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[1196] | 523 | Hadrons->operator[](c1)->SetFormationTime( |
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| 524 | (theInitialStringMass - 2.*SumPz + HadronE - HadronPz)/(2.*kappa)/c_light); //Uzhi1.07.09c_light |
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| 525 | |
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| 526 | G4ThreeVector aPosition(0, 0, |
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| 527 | (theInitialStringMass - 2.*SumE - HadronE + HadronPz)/(2.*kappa)); |
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[819] | 528 | Hadrons->operator[](c1)->SetPosition(aPosition); |
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[1196] | 529 | |
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| 530 | /* |
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| 531 | G4cout<<"kappa "<<kappa<<G4endl; |
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| 532 | G4cout<<c1<<" Partic time, position Old "<< |
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| 533 | (theInitialStringMass - 2.*SumPz + HadronE - HadronPz)/(2.*kappa)<<' '<< |
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| 534 | (theInitialStringMass - 2.*SumE - HadronE + HadronPz)/(2.*kappa)<<G4endl; |
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| 535 | |
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| 536 | G4cout<<c1<<" Partic time, position New "<< |
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| 537 | (theInitialStringMass - 2.*SumPz + HadronE - HadronPz)/(2.*kappa)/c_light<<' '<< |
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| 538 | (theInitialStringMass - 2.*SumE - HadronE + HadronPz)/(2.*kappa)<<G4endl; |
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| 539 | |
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| 540 | G4cout<<"fermi "<<fermi<<" 1/fermi "<<1./fermi<<' '<<"1*fermi/c "<<1.*fermi/c_light<<G4endl; |
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| 541 | G4int Uzhi; G4cin>>Uzhi; // Uzhi 20.06.08 |
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| 542 | */ |
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[819] | 543 | } |
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| 544 | } |
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| 545 | |
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[962] | 546 | //----------------------------------------------------------------------------- |
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[819] | 547 | |
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| 548 | /* |
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| 549 | void G4VLongitudinalStringDecay::CalculateHadronTimePosition(G4double theInitialStringMass, G4KineticTrackVector* Hadrons) |
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| 550 | { |
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| 551 | // 'constituent' formation time |
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| 552 | const G4double kappa = 1.0 * GeV/fermi; |
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| 553 | for(G4int c1 = 0; c1 < Hadrons->length(); c1++) |
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| 554 | { |
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| 555 | G4double SumPz = 0; |
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| 556 | G4double SumE = 0; |
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| 557 | for(G4int c2 = 0; c2 <= c1; c2++) |
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| 558 | { |
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| 559 | SumPz += Hadrons->at(c2)->Get4Momentum().pz(); |
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| 560 | SumE += Hadrons->at(c2)->Get4Momentum().e(); |
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| 561 | } |
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| 562 | Hadrons->at(c1)->SetFormationTime((theInitialStringMass - 2.*SumPz)/(2.*kappa)); |
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| 563 | G4ThreeVector aPosition(0, 0, (theInitialStringMass - 2.*SumE)/(2.*kappa)); |
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| 564 | Hadrons->at(c1)->SetPosition(aPosition); |
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| 565 | } |
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| 566 | c1 = Hadrons->length()-1; |
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| 567 | Hadrons->at(c1)->SetFormationTime(Hadrons->at(c1-1)->GetFormationTime()); |
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| 568 | Hadrons->at(c1)->SetPosition(Hadrons->at(c1-1)->GetPosition()); |
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| 569 | } |
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| 570 | */ |
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| 571 | |
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| 572 | |
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[962] | 573 | //***************************************************************************** |
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[819] | 574 | |
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| 575 | void G4VLongitudinalStringDecay::SetSigmaTransverseMomentum(G4double aValue) |
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| 576 | { |
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| 577 | if ( PastInitPhase ) { |
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| 578 | throw G4HadronicException(__FILE__, __LINE__, "4VLongitudinalStringDecay::SetSigmaTransverseMomentum after FragmentString() not allowed"); |
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| 579 | } else { |
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| 580 | SigmaQT = aValue; |
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| 581 | } |
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| 582 | } |
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| 583 | |
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| 584 | //---------------------------------------------------------------------------------------------------------- |
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| 585 | |
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| 586 | void G4VLongitudinalStringDecay::SetStrangenessSuppression(G4double aValue) |
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| 587 | { |
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| 588 | if ( PastInitPhase ) { |
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| 589 | throw G4HadronicException(__FILE__, __LINE__, "4VLongitudinalStringDecay::SetStrangenessSuppression after FragmentString() not allowed"); |
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| 590 | } else { |
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| 591 | StrangeSuppress = aValue; |
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| 592 | } |
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| 593 | } |
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| 594 | |
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| 595 | //---------------------------------------------------------------------------------------------------------- |
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| 596 | |
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| 597 | void G4VLongitudinalStringDecay::SetDiquarkSuppression(G4double aValue) |
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| 598 | { |
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| 599 | if ( PastInitPhase ) { |
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| 600 | throw G4HadronicException(__FILE__, __LINE__, "4VLongitudinalStringDecay::SetDiquarkSuppression after FragmentString() not allowed"); |
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| 601 | } else { |
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| 602 | DiquarkSuppress = aValue; |
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| 603 | } |
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| 604 | } |
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| 605 | |
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[962] | 606 | //---------------------------------------------------------------------------------------- |
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| 607 | |
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[819] | 608 | void G4VLongitudinalStringDecay::SetDiquarkBreakProbability(G4double aValue) |
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| 609 | { |
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| 610 | if ( PastInitPhase ) { |
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| 611 | throw G4HadronicException(__FILE__, __LINE__, "4VLongitudinalStringDecay::SetDiquarkBreakProbability after FragmentString() not allowed"); |
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| 612 | } else { |
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| 613 | DiquarkBreakProb = aValue; |
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| 614 | } |
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| 615 | } |
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| 616 | |
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| 617 | //---------------------------------------------------------------------------------------------------------- |
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| 618 | |
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| 619 | void G4VLongitudinalStringDecay::SetVectorMesonProbability(G4double aValue) |
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| 620 | { |
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| 621 | if ( PastInitPhase ) { |
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| 622 | throw G4HadronicException(__FILE__, __LINE__, "G4VLongitudinalStringDecay::SetVectorMesonProbability after FragmentString() not allowed"); |
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| 623 | } else { |
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| 624 | pspin_meson = aValue; |
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| 625 | delete hadronizer; |
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| 626 | hadronizer = new G4HadronBuilder(pspin_meson,pspin_barion, |
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| 627 | scalarMesonMix,vectorMesonMix); |
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| 628 | } |
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| 629 | } |
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| 630 | |
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| 631 | //---------------------------------------------------------------------------------------------------------- |
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| 632 | |
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| 633 | void G4VLongitudinalStringDecay::SetSpinThreeHalfBarionProbability(G4double aValue) |
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| 634 | { |
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| 635 | if ( PastInitPhase ) { |
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| 636 | throw G4HadronicException(__FILE__, __LINE__, "G4VLongitudinalStringDecay::SetSpinThreeHalfBarionProbability after FragmentString() not allowed"); |
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| 637 | } else { |
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| 638 | pspin_barion = aValue; |
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| 639 | delete hadronizer; |
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| 640 | hadronizer = new G4HadronBuilder(pspin_meson,pspin_barion, |
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| 641 | scalarMesonMix,vectorMesonMix); |
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| 642 | } |
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| 643 | } |
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| 644 | |
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| 645 | //---------------------------------------------------------------------------------------------------------- |
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| 646 | |
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| 647 | void G4VLongitudinalStringDecay::SetScalarMesonMixings(std::vector<G4double> aVector) |
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| 648 | { |
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| 649 | if ( PastInitPhase ) { |
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| 650 | throw G4HadronicException(__FILE__, __LINE__, "G4VLongitudinalStringDecay::SetScalarMesonMixings after FragmentString() not allowed"); |
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| 651 | } else { |
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| 652 | if ( aVector.size() < 6 ) |
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| 653 | throw G4HadronicException(__FILE__, __LINE__, "G4VLongitudinalStringDecay::SetScalarMesonMixings( argument Vector too small"); |
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| 654 | scalarMesonMix[0] = aVector[0]; |
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| 655 | scalarMesonMix[1] = aVector[1]; |
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| 656 | scalarMesonMix[2] = aVector[2]; |
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| 657 | scalarMesonMix[3] = aVector[3]; |
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| 658 | scalarMesonMix[4] = aVector[4]; |
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| 659 | scalarMesonMix[5] = aVector[5]; |
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| 660 | delete hadronizer; |
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| 661 | hadronizer = new G4HadronBuilder(pspin_meson,pspin_barion, |
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| 662 | scalarMesonMix,vectorMesonMix); |
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| 663 | } |
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| 664 | } |
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| 665 | |
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| 666 | //---------------------------------------------------------------------------------------------------------- |
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| 667 | |
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| 668 | void G4VLongitudinalStringDecay::SetVectorMesonMixings(std::vector<G4double> aVector) |
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| 669 | { |
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| 670 | if ( PastInitPhase ) { |
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| 671 | throw G4HadronicException(__FILE__, __LINE__, "G4VLongitudinalStringDecay::SetVectorMesonMixings after FragmentString() not allowed"); |
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| 672 | } else { |
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| 673 | if ( aVector.size() < 6 ) |
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| 674 | throw G4HadronicException(__FILE__, __LINE__, "G4VLongitudinalStringDecay::SetVectorMesonMixings( argument Vector too small"); |
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| 675 | vectorMesonMix[0] = aVector[0]; |
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| 676 | vectorMesonMix[1] = aVector[1]; |
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| 677 | vectorMesonMix[2] = aVector[2]; |
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| 678 | vectorMesonMix[3] = aVector[3]; |
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| 679 | vectorMesonMix[4] = aVector[4]; |
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| 680 | vectorMesonMix[5] = aVector[5]; |
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| 681 | delete hadronizer; |
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| 682 | hadronizer = new G4HadronBuilder(pspin_meson,pspin_barion, |
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| 683 | scalarMesonMix,vectorMesonMix); |
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| 684 | |
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| 685 | } |
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[962] | 686 | } |
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| 687 | |
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| 688 | //------------------------------------------------------------------------------------------- |
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| 689 | void G4VLongitudinalStringDecay::SetStringTensionParameter(G4double aValue)// Uzhi 20 June 08 |
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| 690 | { |
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| 691 | Kappa = aValue * GeV/fermi; |
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[819] | 692 | } |
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[962] | 693 | //************************************************************************************** |
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| 694 | |
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