[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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[962] | 27 | // $Id: G4LundStringFragmentation.cc,v 1.13 2008/06/23 09:17:10 gcosmo Exp $ |
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| 28 | // GEANT4 tag $Name: geant4-09-02-ref-02 $ 1.8 |
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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, 10-Jul-1998 |
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| 34 | // ----------------------------------------------------------------------------- |
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| 35 | #include "G4LundStringFragmentation.hh" |
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| 36 | #include "G4FragmentingString.hh" |
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| 37 | #include "G4DiQuarks.hh" |
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| 38 | #include "G4Quarks.hh" |
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| 39 | |
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| 40 | #include "Randomize.hh" |
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| 41 | |
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| 42 | // Class G4LundStringFragmentation |
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[962] | 43 | //************************************************************************************* |
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[819] | 44 | |
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| 45 | G4LundStringFragmentation::G4LundStringFragmentation() |
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| 46 | { |
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[962] | 47 | // ------ For estimation of a minimal string mass --------------- |
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| 48 | Mass_of_light_quark =140.*MeV; |
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| 49 | Mass_of_heavy_quark =500.*MeV; |
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| 50 | Mass_of_string_junction=720.*MeV; |
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| 51 | // ------ An estimated minimal string mass ---------------------- |
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| 52 | MinimalStringMass = 0.; |
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| 53 | MinimalStringMass2 = 0.; |
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| 54 | // ------ Minimal invariant mass used at a string fragmentation - |
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| 55 | WminLUND = 0.7*GeV; // Uzhi 0.8 1.5 |
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| 56 | // ------ Smooth parameter used at a string fragmentation for --- |
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| 57 | // ------ smearinr sharp mass cut-off --------------------------- |
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| 58 | SmoothParam = 0.2; |
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[819] | 59 | |
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[962] | 60 | SetStringTensionParameter(0.25); // Uzhi 20 June 08 |
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[819] | 61 | } |
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| 62 | |
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[962] | 63 | // -------------------------------------------------------------- |
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[819] | 64 | G4LundStringFragmentation::G4LundStringFragmentation(const G4LundStringFragmentation &) : G4VLongitudinalStringDecay() |
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| 65 | { |
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| 66 | } |
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| 67 | |
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| 68 | G4LundStringFragmentation::~G4LundStringFragmentation() |
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| 69 | { |
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| 70 | } |
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| 71 | |
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[962] | 72 | //************************************************************************************* |
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[819] | 73 | |
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| 74 | const G4LundStringFragmentation & G4LundStringFragmentation::operator=(const G4LundStringFragmentation &) |
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| 75 | { |
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| 76 | throw G4HadronicException(__FILE__, __LINE__, "G4LundStringFragmentation::operator= meant to not be accessable"); |
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| 77 | return *this; |
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| 78 | } |
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| 79 | |
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| 80 | int G4LundStringFragmentation::operator==(const G4LundStringFragmentation &right) const |
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| 81 | { |
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| 82 | return !memcmp(this, &right, sizeof(G4LundStringFragmentation)); |
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| 83 | } |
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| 84 | |
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| 85 | int G4LundStringFragmentation::operator!=(const G4LundStringFragmentation &right) const |
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| 86 | { |
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| 87 | return memcmp(this, &right, sizeof(G4LundStringFragmentation)); |
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| 88 | } |
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| 89 | |
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[962] | 90 | //-------------------------------------------------------------------------------------- |
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| 91 | void G4LundStringFragmentation::SetMinimalStringMass(const G4FragmentingString * const string) // Uzhi |
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| 92 | { |
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| 93 | /* |
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| 94 | G4cout<<"In SetMinMass -------------------"<<std::sqrt(string->Mass2())<<G4endl; |
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| 95 | G4cout<<string->GetLeftParton()->GetPDGEncoding()<<" "<< |
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| 96 | string->GetRightParton()->GetPDGEncoding()<<G4endl; |
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| 97 | */ |
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| 98 | G4double EstimatedMass=0.; |
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| 99 | G4int Number_of_quarks=0; |
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[819] | 100 | |
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[962] | 101 | G4int Qleft =std::abs(string->GetLeftParton()->GetPDGEncoding()); |
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| 102 | |
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| 103 | if( Qleft > 1000) |
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| 104 | { |
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| 105 | Number_of_quarks+=2; |
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| 106 | G4int q1=Qleft/1000; |
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| 107 | if( q1 < 3) {EstimatedMass +=Mass_of_light_quark;} |
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| 108 | if( q1 > 2) {EstimatedMass +=Mass_of_heavy_quark;} |
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| 109 | |
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| 110 | G4int q2=(Qleft/100)%10; |
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| 111 | if( q2 < 3) {EstimatedMass +=Mass_of_light_quark;} |
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| 112 | if( q2 > 2) {EstimatedMass +=Mass_of_heavy_quark;} |
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| 113 | EstimatedMass +=Mass_of_string_junction; |
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| 114 | } |
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| 115 | else |
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| 116 | { |
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| 117 | Number_of_quarks++; |
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| 118 | if( Qleft < 3) {EstimatedMass +=Mass_of_light_quark;} |
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| 119 | if( Qleft > 2) {EstimatedMass +=Mass_of_heavy_quark;} |
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| 120 | } |
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| 121 | |
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| 122 | G4int Qright=std::abs(string->GetRightParton()->GetPDGEncoding()); |
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| 123 | |
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| 124 | if( Qright > 1000) |
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| 125 | { |
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| 126 | Number_of_quarks+=2; |
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| 127 | G4int q1=Qright/1000; |
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| 128 | if( q1 < 3) {EstimatedMass +=Mass_of_light_quark;} |
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| 129 | if( q1 > 2) {EstimatedMass +=Mass_of_heavy_quark;} |
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| 130 | |
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| 131 | G4int q2=(Qright/100)%10; |
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| 132 | if( q2 < 3) {EstimatedMass +=Mass_of_light_quark;} |
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| 133 | if( q2 > 2) {EstimatedMass +=Mass_of_heavy_quark;} |
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| 134 | EstimatedMass +=Mass_of_string_junction; |
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| 135 | } |
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| 136 | else |
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| 137 | { |
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| 138 | Number_of_quarks++; |
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| 139 | if( Qright < 3) {EstimatedMass +=Mass_of_light_quark;} |
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| 140 | if( Qright > 2) {EstimatedMass +=Mass_of_heavy_quark;} |
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| 141 | } |
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| 142 | |
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| 143 | if(Number_of_quarks==2){EstimatedMass +=100.*MeV;} |
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| 144 | if(Number_of_quarks==3){EstimatedMass += 20.*MeV;} |
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| 145 | if(Number_of_quarks==4){EstimatedMass -=2.*Mass_of_string_junction; |
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| 146 | if(EstimatedMass <= 1600.*MeV){EstimatedMass-=200.*MeV;} |
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| 147 | else {EstimatedMass+=100.*MeV;} |
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| 148 | } |
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| 149 | MinimalStringMass=EstimatedMass; |
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| 150 | SetMinimalStringMass2(EstimatedMass); |
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| 151 | //G4cout<<"Out SetMinimalStringMass "<<MinimalStringMass<<G4endl; |
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| 152 | } |
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| 153 | |
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| 154 | //-------------------------------------------------------------------------------------- |
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| 155 | void G4LundStringFragmentation::SetMinimalStringMass2( |
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| 156 | const G4double aValue) |
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[819] | 157 | { |
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[962] | 158 | MinimalStringMass2=aValue * aValue; |
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| 159 | } |
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[819] | 160 | |
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[962] | 161 | //-------------------------------------------------------------------------------------- |
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| 162 | G4KineticTrackVector* G4LundStringFragmentation::FragmentString( |
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| 163 | const G4ExcitedString& theString) |
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| 164 | { |
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| 165 | |
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[819] | 166 | //G4cout<<"In FragmentString"<<G4endl; |
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| 167 | |
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| 168 | // Can no longer modify Parameters for Fragmentation. |
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| 169 | PastInitPhase=true; |
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| 170 | |
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| 171 | // check if string has enough mass to fragment... |
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[962] | 172 | |
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| 173 | SetMassCut(160.*MeV); // For LightFragmentationTest it is required |
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| 174 | // that no one pi-meson can be produced |
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| 175 | /* |
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| 176 | G4cout<<G4endl<<"G4LundStringFragmentation::"<<G4endl; |
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| 177 | G4cout<<"FragmentString Position"<<theString.GetPosition()/fermi<<" "<< |
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| 178 | theString.GetTimeOfCreation()/fermi<<G4endl; |
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| 179 | G4cout<<"FragmentString Momentum"<<theString.Get4Momentum()<<theString.Get4Momentum().mag()<<G4endl; |
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| 180 | */ |
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[819] | 181 | G4KineticTrackVector * LeftVector=LightFragmentationTest(&theString); |
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| 182 | if ( LeftVector != 0 ) { |
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[962] | 183 | //G4cout<<"Return single hadron insted of string"<<G4endl; |
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| 184 | // Uzhi insert 6.05.08 start |
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| 185 | if(LeftVector->size() == 1){ |
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| 186 | // One hadron is saved in the interaction |
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| 187 | LeftVector->operator[](0)->SetFormationTime(theString.GetTimeOfCreation()); |
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| 188 | LeftVector->operator[](0)->SetPosition(theString.GetPosition()); |
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| 189 | |
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| 190 | /* // To set large formation time open * |
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| 191 | LeftVector->operator[](0)->SetFormationTime(theString.GetTimeOfCreation()+100.*fermi); |
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| 192 | LeftVector->operator[](0)->SetPosition(theString.GetPosition()); |
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| 193 | G4ThreeVector aPosition(theString.GetPosition().x(), |
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| 194 | theString.GetPosition().y(), |
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| 195 | theString.GetPosition().z()+100.*fermi); |
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| 196 | LeftVector->operator[](0)->SetPosition(aPosition); |
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| 197 | */ |
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| 198 | //G4cout<<"Single hadron "<<LeftVector->operator[](0)->GetPosition()<<" "<<LeftVector->operator[](0)->GetFormationTime()<<G4endl; |
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| 199 | } else { // 2 hadrons created from qq-qqbar are stored |
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| 200 | LeftVector->operator[](0)->SetFormationTime(theString.GetTimeOfCreation()); |
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| 201 | LeftVector->operator[](0)->SetPosition(theString.GetPosition()); |
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| 202 | LeftVector->operator[](1)->SetFormationTime(theString.GetTimeOfCreation()); |
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| 203 | LeftVector->operator[](1)->SetPosition(theString.GetPosition()); |
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| 204 | } |
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| 205 | // Uzhi insert 6.05.08 end |
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| 206 | return LeftVector; |
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| 207 | } |
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| 208 | |
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| 209 | //--------------------- The string can fragment ------------------------------- |
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| 210 | //--------------- At least two particles can be produced ---------------------- |
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| 211 | |
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| 212 | LeftVector =new G4KineticTrackVector; |
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[819] | 213 | G4KineticTrackVector * RightVector=new G4KineticTrackVector; |
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| 214 | |
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| 215 | G4ExcitedString *theStringInCMS=CPExcited(theString); |
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| 216 | G4LorentzRotation toCms=theStringInCMS->TransformToAlignedCms(); |
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| 217 | |
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| 218 | G4bool success=false, inner_sucess=true; |
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| 219 | G4int attempt=0; |
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| 220 | while ( !success && attempt++ < StringLoopInterrupt ) |
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[962] | 221 | { // If the string fragmentation do not be happend, repeat the fragmentation--- |
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[819] | 222 | G4FragmentingString *currentString=new G4FragmentingString(*theStringInCMS); |
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| 223 | |
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[962] | 224 | //G4cout<<"FragmentString cur M2 "<<std::sqrt(currentString->Mass2())<<G4endl; |
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| 225 | // Cleaning up the previously produced hadrons ------------------------------ |
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| 226 | std::for_each(LeftVector->begin() , LeftVector->end() , DeleteKineticTrack()); |
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| 227 | LeftVector->clear(); |
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[819] | 228 | |
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| 229 | std::for_each(RightVector->begin(), RightVector->end(), DeleteKineticTrack()); |
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| 230 | RightVector->clear(); |
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| 231 | |
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[962] | 232 | // Main fragmentation loop until the string will not be able to fragment ---- |
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[819] | 233 | inner_sucess=true; // set false on failure.. |
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| 234 | while (! StopFragmenting(currentString) ) |
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| 235 | { // Split current string into hadron + new string |
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| 236 | G4FragmentingString *newString=0; // used as output from SplitUp... |
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| 237 | |
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| 238 | //G4cout<<"FragmentString to Splitup ===================================="<<G4endl; |
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[962] | 239 | //G4cout<<"++++++++++++++++++++++++++ Enter num--------------------------"<<G4endl; |
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[819] | 240 | //G4int Uzhi; G4cin>>Uzhi; // Uzhi |
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[962] | 241 | |
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[819] | 242 | G4KineticTrack * Hadron=Splitup(currentString,newString); |
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| 243 | //G4cout<<" Hadron "<<Hadron<<G4endl; |
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| 244 | |
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[962] | 245 | if ( Hadron != 0 ) // Store the hadron |
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[819] | 246 | { |
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| 247 | if ( currentString->GetDecayDirection() > 0 ) |
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| 248 | LeftVector->push_back(Hadron); |
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| 249 | else |
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| 250 | RightVector->push_back(Hadron); |
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| 251 | delete currentString; |
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| 252 | currentString=newString; |
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[962] | 253 | } |
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[819] | 254 | }; |
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[962] | 255 | // Split remaining string into 2 final Hadrons ------------------------ |
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[819] | 256 | //G4cout<<"FragmentString to SplitLast if inner_sucess#0"<<inner_sucess<<G4endl; |
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[962] | 257 | if ( inner_sucess && |
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[819] | 258 | SplitLast(currentString,LeftVector, RightVector) ) |
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| 259 | { |
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| 260 | success=true; |
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| 261 | } |
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| 262 | delete currentString; |
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[962] | 263 | } // End of the loop in attemps to fragment the string |
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[819] | 264 | |
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| 265 | delete theStringInCMS; |
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| 266 | |
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| 267 | if ( ! success ) |
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| 268 | { |
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| 269 | std::for_each(LeftVector->begin(), LeftVector->end(), DeleteKineticTrack()); |
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| 270 | LeftVector->clear(); |
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| 271 | std::for_each(RightVector->begin(), RightVector->end(), DeleteKineticTrack()); |
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| 272 | delete RightVector; |
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| 273 | return LeftVector; |
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| 274 | } |
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| 275 | |
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| 276 | // Join Left- and RightVector into LeftVector in correct order. |
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| 277 | while(!RightVector->empty()) |
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| 278 | { |
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| 279 | LeftVector->push_back(RightVector->back()); |
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| 280 | RightVector->erase(RightVector->end()-1); |
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| 281 | } |
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| 282 | delete RightVector; |
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| 283 | |
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| 284 | //G4cout<<"CalculateHadronTimePosition"<<G4endl; |
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| 285 | |
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| 286 | CalculateHadronTimePosition(theString.Get4Momentum().mag(), LeftVector); |
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| 287 | |
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| 288 | G4LorentzRotation toObserverFrame(toCms.inverse()); |
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| 289 | |
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[962] | 290 | // LeftVector->operator[](0)->SetFormationTime(theString.GetTimeOfCreation()); |
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| 291 | // LeftVector->operator[](0)->SetPosition(theString.GetPosition()); |
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| 292 | |
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| 293 | G4double TimeOftheStringCreation=theString.GetTimeOfCreation(); |
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| 294 | G4ThreeVector PositionOftheStringCreation(theString.GetPosition()); |
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| 295 | |
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| 296 | /* // For large formation time open * |
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| 297 | G4double TimeOftheStringCreation=theString.GetTimeOfCreation()+100*fermi; |
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| 298 | G4ThreeVector PositionOftheStringCreation(theString.GetPosition().x(), |
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| 299 | theString.GetPosition().y(), |
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| 300 | theString.GetPosition().z()+100*fermi); |
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| 301 | */ |
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| 302 | |
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| 303 | /* |
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| 304 | if(theString.GetPosition().y() > 100.*fermi){ |
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| 305 | // It is a projectile-like string ------------------------------------- |
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| 306 | G4double Zmin=theString.GetPosition().y()-1000.*fermi; |
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| 307 | G4double Zmax=theString.GetPosition().z(); |
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| 308 | TimeOftheStringCreation= |
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| 309 | (Zmax-Zmin)*theString.Get4Momentum().e()/theString.Get4Momentum().z(); |
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| 310 | |
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| 311 | G4ThreeVector aPosition(0.,0.,Zmax); |
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| 312 | PositionOftheStringCreation=aPosition; |
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| 313 | } |
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| 314 | */ |
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[819] | 315 | for(size_t C1 = 0; C1 < LeftVector->size(); C1++) |
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| 316 | { |
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| 317 | G4KineticTrack* Hadron = LeftVector->operator[](C1); |
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| 318 | G4LorentzVector Momentum = Hadron->Get4Momentum(); |
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| 319 | Momentum = toObserverFrame*Momentum; |
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| 320 | Hadron->Set4Momentum(Momentum); |
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[962] | 321 | |
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[819] | 322 | G4LorentzVector Coordinate(Hadron->GetPosition(), Hadron->GetFormationTime()); |
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| 323 | Momentum = toObserverFrame*Coordinate; |
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[962] | 324 | Hadron->SetFormationTime(TimeOftheStringCreation+Momentum.e()); |
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[819] | 325 | G4ThreeVector aPosition(Momentum.vect()); |
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[962] | 326 | // Hadron->SetPosition(theString.GetPosition()+aPosition); |
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| 327 | Hadron->SetPosition(PositionOftheStringCreation+aPosition); |
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| 328 | //G4cout<<"Hadron "<<C1<<" "<<Hadron->GetPosition()/fermi<<" "<<Hadron->GetFormationTime()/fermi<<G4endl; |
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| 329 | }; |
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[819] | 330 | |
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| 331 | //G4cout<<"Out FragmentString"<<G4endl; |
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| 332 | return LeftVector; |
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| 333 | |
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[962] | 334 | } |
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[819] | 335 | |
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[962] | 336 | //---------------------------------------------------------------------------------- |
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| 337 | G4bool G4LundStringFragmentation::IsFragmentable(const G4FragmentingString * const string) |
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| 338 | { |
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| 339 | //G4cout<<"In IsFragmentable"<<G4endl; |
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| 340 | SetMinimalStringMass(string); // Uzhi |
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| 341 | //G4cout<<"Out IsFragmentable MinMass"<<MinimalStringMass<<" String Mass"<<std::sqrt(string->Get4Momentum().mag2())<<G4endl; |
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| 342 | return sqr(MinimalStringMass + WminLUND) < string->Get4Momentum().mag2(); // Uzhi |
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[819] | 343 | |
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[962] | 344 | // return sqr(FragmentationMass(string)+MassCut) < // Uzhi |
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| 345 | // string->Mass2(); // Uzhi |
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[819] | 346 | } |
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| 347 | |
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[962] | 348 | //---------------------------------------------------------------------------------------- |
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| 349 | G4bool G4LundStringFragmentation::StopFragmenting(const G4FragmentingString * const string) |
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| 350 | { |
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| 351 | //G4cout<<"StopFragmenting"<<G4endl; |
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[819] | 352 | |
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[962] | 353 | SetMinimalStringMass(string); |
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[819] | 354 | |
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[962] | 355 | //G4cout<<"StopFragm MinMass "<<MinimalStringMass<<" String Mass "<<std::sqrt(string->Get4Momentum().mag2())<<G4endl; |
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[819] | 356 | |
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[962] | 357 | return (MinimalStringMass + WminLUND)* |
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| 358 | (1 + SmoothParam * (1.-2*G4UniformRand())) > |
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| 359 | string->Mass(); |
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[819] | 360 | } |
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| 361 | |
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[962] | 362 | //---------------------------------------------------------------------------------------- |
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[819] | 363 | G4bool G4LundStringFragmentation::SplitLast(G4FragmentingString * string, |
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| 364 | G4KineticTrackVector * LeftVector, |
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| 365 | G4KineticTrackVector * RightVector) |
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| 366 | { |
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| 367 | //... perform last cluster decay |
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[962] | 368 | /* |
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| 369 | G4cout<<"SplitLast String mass "<<string->Mass()<<G4endl; |
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| 370 | G4cout<<string->GetLeftParton()->GetPDGEncoding()<<" "<<G4endl; |
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| 371 | G4cout<<string->GetRightParton()->GetPDGEncoding()<<" "<<G4endl; |
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| 372 | */ |
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| 373 | G4LorentzVector Str4Mom=string->Get4Momentum(); |
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| 374 | //G4cout<<"String 4 momentum "<<Str4Mom<<G4endl; |
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[819] | 375 | G4ThreeVector ClusterVel =string->Get4Momentum().boostVector(); |
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| 376 | |
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| 377 | G4double ResidualMass = string->Mass(); |
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| 378 | |
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[962] | 379 | G4ParticleDefinition * LeftHadron, * RightHadron; |
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| 380 | |
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[819] | 381 | G4int cClusterInterrupt = 0; |
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| 382 | do |
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| 383 | { |
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| 384 | //G4cout<<" Cicle "<<cClusterInterrupt<<" "<< ClusterLoopInterrupt<<G4endl; |
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| 385 | |
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| 386 | if (cClusterInterrupt++ >= ClusterLoopInterrupt) |
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| 387 | { |
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| 388 | return false; |
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| 389 | } |
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| 390 | G4ParticleDefinition * quark = NULL; |
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| 391 | string->SetLeftPartonStable(); // to query quark contents.. |
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| 392 | |
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[962] | 393 | if (!string->FourQuarkString() ) |
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| 394 | { |
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| 395 | // The string is q-qbar, or q-qq, or qbar-qqbar type |
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| 396 | if (string->DecayIsQuark() && string->StableIsQuark() ) |
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| 397 | { |
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| 398 | //... there are quarks on cluster ends |
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| 399 | LeftHadron= QuarkSplitup(string->GetLeftParton(), quark); |
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| 400 | } else |
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| 401 | { |
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| 402 | //... there is a Diquark on one of the cluster ends |
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| 403 | G4int IsParticle; |
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[819] | 404 | |
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[962] | 405 | if ( string->StableIsQuark() ) |
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| 406 | { |
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| 407 | IsParticle=(string->GetLeftParton()->GetPDGEncoding()>0) ? -1 : +1; |
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| 408 | } else |
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| 409 | { |
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| 410 | IsParticle=(string->GetLeftParton()->GetPDGEncoding()>0) ? +1 : -1; |
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| 411 | } |
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[819] | 412 | |
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[962] | 413 | pDefPair QuarkPair = CreatePartonPair(IsParticle,false); // no diquarks wanted |
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| 414 | quark = QuarkPair.second; |
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[819] | 415 | |
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[962] | 416 | LeftHadron=hadronizer->Build(QuarkPair.first, string->GetLeftParton()); |
---|
| 417 | } |
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[819] | 418 | |
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[962] | 419 | RightHadron = hadronizer->Build(string->GetRightParton(), quark); |
---|
| 420 | } else |
---|
| 421 | { |
---|
| 422 | // The string is qq-qqbar type. Diquarks are on the string ends |
---|
| 423 | G4int LiftQuark1= string->GetLeftParton()->GetPDGEncoding()/1000; |
---|
| 424 | G4int LiftQuark2=(string->GetLeftParton()->GetPDGEncoding()/100)%10; |
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[819] | 425 | |
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[962] | 426 | G4int RightQuark1= string->GetRightParton()->GetPDGEncoding()/1000; |
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| 427 | G4int RightQuark2=(string->GetRightParton()->GetPDGEncoding()/100)%10; |
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[819] | 428 | |
---|
[962] | 429 | if(G4UniformRand()<0.5) |
---|
| 430 | { |
---|
| 431 | LeftHadron =hadronizer->Build(FindParticle( LiftQuark1), |
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| 432 | FindParticle(RightQuark1)); |
---|
| 433 | RightHadron=hadronizer->Build(FindParticle( LiftQuark2), |
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| 434 | FindParticle(RightQuark2)); |
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| 435 | } else |
---|
| 436 | { |
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| 437 | LeftHadron =hadronizer->Build(FindParticle( LiftQuark1), |
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| 438 | FindParticle(RightQuark2)); |
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| 439 | RightHadron=hadronizer->Build(FindParticle( LiftQuark2), |
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| 440 | FindParticle(RightQuark1)); |
---|
| 441 | } |
---|
| 442 | } |
---|
| 443 | /* |
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| 444 | G4cout<<"SplitLast Left Right hadrons "<<LeftHadron->GetPDGEncoding()<<" "<<RightHadron->GetPDGEncoding()<<G4endl; |
---|
| 445 | G4cout<<"SplitLast Left Right hadrons "<<LeftHadron->GetPDGMass()<<" "<<RightHadron->GetPDGMass()<<G4endl; |
---|
| 446 | G4cout<<"Sum H mass Str Mass "<<LeftHadron->GetPDGMass() + RightHadron->GetPDGMass()<<" "<<ResidualMass<<G4endl; |
---|
| 447 | */ |
---|
[819] | 448 | //... repeat procedure, if mass of cluster is too low to produce hadrons |
---|
| 449 | //... ClusterMassCut = 0.15*GeV model parameter |
---|
| 450 | |
---|
| 451 | } |
---|
[962] | 452 | while (ResidualMass <= LeftHadron->GetPDGMass() + RightHadron->GetPDGMass());// UzhiVOVA |
---|
| 453 | |
---|
[819] | 454 | //... compute hadron momenta and energies |
---|
| 455 | |
---|
| 456 | G4LorentzVector LeftMom, RightMom; |
---|
| 457 | G4ThreeVector Pos; |
---|
| 458 | |
---|
[962] | 459 | Sample4Momentum(&LeftMom, LeftHadron->GetPDGMass(), |
---|
| 460 | &RightMom, RightHadron->GetPDGMass(), |
---|
| 461 | ResidualMass); |
---|
[819] | 462 | |
---|
| 463 | LeftMom.boost(ClusterVel); |
---|
| 464 | RightMom.boost(ClusterVel); |
---|
| 465 | |
---|
| 466 | LeftVector->push_back(new G4KineticTrack(LeftHadron, 0, Pos, LeftMom)); |
---|
| 467 | RightVector->push_back(new G4KineticTrack(RightHadron, 0, Pos, RightMom)); |
---|
| 468 | |
---|
[962] | 469 | //G4cout<<"Out SplitLast "<<G4endl; |
---|
[819] | 470 | return true; |
---|
| 471 | |
---|
| 472 | } |
---|
| 473 | |
---|
| 474 | //---------------------------------------------------------------------------------------------------------- |
---|
| 475 | |
---|
[962] | 476 | void G4LundStringFragmentation::Sample4Momentum(G4LorentzVector* Mom, G4double Mass, G4LorentzVector* AntiMom, G4double AntiMass, G4double InitialMass) |
---|
| 477 | { |
---|
| 478 | // ------ Sampling of momenta of 2 last produced hadrons -------------------- |
---|
| 479 | G4ThreeVector Pt; |
---|
| 480 | G4double MassMt2, AntiMassMt2; |
---|
| 481 | G4double AvailablePz, AvailablePz2; |
---|
[819] | 482 | |
---|
[962] | 483 | //G4cout<<"Sample4Momentum "<<G4endl; |
---|
| 484 | //G4cout<<"Sample4Momentum Mass"<<Mass<<" "<<AntiMass<<" "<<InitialMass<<G4endl; |
---|
| 485 | |
---|
| 486 | if(Mass > 930. || AntiMass > 930.) // If there is a baryon |
---|
| 487 | { |
---|
| 488 | // ----------------- Isotripic decay ------------------------------------ |
---|
| 489 | G4double r_val = sqr(InitialMass*InitialMass - Mass*Mass - AntiMass*AntiMass) - |
---|
| 490 | sqr(2.*Mass*AntiMass); |
---|
| 491 | G4double Pabs = (r_val > 0.)? std::sqrt(r_val)/(2.*InitialMass) : 0; |
---|
[819] | 492 | |
---|
[962] | 493 | //... sample unit vector |
---|
| 494 | G4double pz = 1. - 2.*G4UniformRand(); |
---|
| 495 | G4double st = std::sqrt(1. - pz * pz)*Pabs; |
---|
| 496 | G4double phi = 2.*pi*G4UniformRand(); |
---|
| 497 | G4double px = st*std::cos(phi); |
---|
| 498 | G4double py = st*std::sin(phi); |
---|
| 499 | pz *= Pabs; |
---|
| 500 | |
---|
| 501 | Mom->setPx(px); Mom->setPy(py); Mom->setPz(pz); |
---|
| 502 | Mom->setE(std::sqrt(Pabs*Pabs + Mass*Mass)); |
---|
[819] | 503 | |
---|
[962] | 504 | AntiMom->setPx(-px); AntiMom->setPy(-py); AntiMom->setPz(-pz); |
---|
| 505 | AntiMom->setE (std::sqrt(Pabs*Pabs + AntiMass*AntiMass)); |
---|
| 506 | } |
---|
| 507 | else |
---|
| 508 | { |
---|
| 509 | do |
---|
| 510 | { |
---|
| 511 | Pt=SampleQuarkPt(); Pt.setZ(0); G4double Pt2=Pt.mag2(); |
---|
[819] | 512 | |
---|
| 513 | //G4cout<<"Sample4Momentum Pt x y "<<Pt.getX()<<" "<<Pt.getY()<<G4endl; |
---|
| 514 | |
---|
[962] | 515 | MassMt2 = Mass * Mass + Pt2; |
---|
| 516 | AntiMassMt2= AntiMass * AntiMass + Pt2; |
---|
[819] | 517 | |
---|
| 518 | //G4cout<<"Mts "<<MassMt2<<" "<<AntiMassMt2<<" "<<InitialMass*InitialMass<<G4endl; |
---|
| 519 | |
---|
[962] | 520 | AvailablePz2= sqr(InitialMass*InitialMass - MassMt2 - AntiMassMt2) - |
---|
| 521 | 4.*MassMt2*AntiMassMt2; |
---|
| 522 | } |
---|
| 523 | while(AvailablePz2 < 0.); |
---|
| 524 | |
---|
| 525 | AvailablePz2 /=(4.*InitialMass*InitialMass); |
---|
| 526 | AvailablePz = std::sqrt(AvailablePz2); |
---|
[819] | 527 | |
---|
| 528 | //G4cout<<"AvailablePz "<<AvailablePz<<G4endl; |
---|
| 529 | |
---|
[962] | 530 | G4double Px=Pt.getX(); |
---|
| 531 | G4double Py=Pt.getY(); |
---|
[819] | 532 | |
---|
[962] | 533 | //if(Mass > AntiMass){AvailablePz=-AvailablePz;} // May30 // Uzhi |
---|
[819] | 534 | |
---|
[962] | 535 | Mom->setPx(Px); Mom->setPy(Py); Mom->setPz(AvailablePz); |
---|
| 536 | Mom->setE(std::sqrt(MassMt2+AvailablePz2)); |
---|
| 537 | |
---|
[819] | 538 | //G4cout<<" 1 part "<<Px<<" "<<Py<<" "<<AvailablePz<<" "<<std::sqrt(MassMt2+AvailablePz2)<<G4endl; |
---|
| 539 | |
---|
[962] | 540 | AntiMom->setPx(-Px); AntiMom->setPy(-Py); AntiMom->setPz(-AvailablePz); |
---|
| 541 | AntiMom->setE (std::sqrt(AntiMassMt2+AvailablePz2)); |
---|
[819] | 542 | |
---|
| 543 | //G4cout<<" 2 part "<<-Px<<" "<<-Py<<" "<<-AvailablePz<<" "<<std::sqrt(AntiMassMt2+AvailablePz2)<<G4endl; |
---|
[962] | 544 | } |
---|
[819] | 545 | |
---|
[962] | 546 | //G4cout<<"Out Sample4Momentum "<<G4endl; |
---|
| 547 | } |
---|
[819] | 548 | |
---|
[962] | 549 | //----------------------------------------------------------------------------- |
---|
[819] | 550 | |
---|
[962] | 551 | G4LorentzVector * G4LundStringFragmentation::SplitEandP(G4ParticleDefinition * pHadron, |
---|
| 552 | G4FragmentingString * string, G4FragmentingString * newString) |
---|
| 553 | { |
---|
| 554 | /* |
---|
| 555 | G4cout<<"SplitEandP "<<G4endl; |
---|
| 556 | G4cout<<"SplitEandP string mass "<<string->Mass()<<G4endl; |
---|
| 557 | G4cout<<string->GetLeftParton()->GetPDGEncoding()<<" " |
---|
| 558 | <<string->GetRightParton()->GetPDGEncoding()<<" "<<G4endl; |
---|
| 559 | G4cout<<G4endl; |
---|
| 560 | G4cout<<newString->GetLeftParton()->GetPDGEncoding()<<" "<<G4endl; |
---|
| 561 | G4cout<<newString->GetRightParton()->GetPDGEncoding()<<" "<<G4endl; |
---|
| 562 | */ |
---|
| 563 | G4LorentzVector String4Momentum=string->Get4Momentum(); |
---|
| 564 | G4double StringMT2=string->Get4Momentum().mt2(); |
---|
| 565 | //G4cout<<"StringMt2 "<<StringMT2<<G4endl; |
---|
[819] | 566 | |
---|
[962] | 567 | G4double HadronMass = pHadron->GetPDGMass(); |
---|
| 568 | //G4cout<<"Hadron mass "<<HadronMass<<" "<<pHadron->GetParticleName()<<G4endl; |
---|
[819] | 569 | |
---|
[962] | 570 | SetMinimalStringMass(newString); |
---|
| 571 | String4Momentum.setPz(0.); |
---|
| 572 | G4ThreeVector StringPt=String4Momentum.vect(); |
---|
| 573 | //G4cout<<"StringPt "<<StringPt<<G4endl<<G4endl; |
---|
| 574 | //G4cout<<"Min string mass "<<MinimalStringMass<<G4endl; |
---|
[819] | 575 | |
---|
[962] | 576 | // calculate and assign hadron transverse momentum component HadronPx and HadronPy |
---|
| 577 | G4ThreeVector thePt; |
---|
| 578 | thePt=SampleQuarkPt(); |
---|
[819] | 579 | |
---|
[962] | 580 | G4ThreeVector HadronPt = thePt +string->DecayPt(); |
---|
| 581 | HadronPt.setZ(0); |
---|
| 582 | //G4cout<<"Hadron Pt"<<HadronPt<<G4endl; |
---|
[819] | 583 | |
---|
[962] | 584 | G4ThreeVector RemSysPt = StringPt - HadronPt; |
---|
| 585 | //G4cout<<"RemSys Pt"<<RemSysPt<<G4endl; |
---|
[819] | 586 | |
---|
[962] | 587 | //... sample z to define hadron longitudinal momentum and energy |
---|
| 588 | //... but first check the available phase space |
---|
[819] | 589 | |
---|
[962] | 590 | G4double HadronMassT2 = sqr(HadronMass) + HadronPt.mag2(); |
---|
| 591 | G4double ResidualMassT2=sqr(MinimalStringMass) + RemSysPt.mag2(); |
---|
[819] | 592 | |
---|
[962] | 593 | //G4cout<<"Mt h res str "<<std::sqrt(HadronMassT2)<<" "<<std::sqrt(ResidualMassT2)<<" srt mass"<<StringMT2<<G4endl; |
---|
[819] | 594 | |
---|
[962] | 595 | G4double Pz2 = (sqr(StringMT2 - HadronMassT2 - ResidualMassT2) - |
---|
| 596 | 4*HadronMassT2 * ResidualMassT2)/4./StringMT2; |
---|
[819] | 597 | |
---|
[962] | 598 | //G4cout<<"Pz**2 "<<Pz2<<G4endl; |
---|
[819] | 599 | |
---|
[962] | 600 | if(Pz2 < 0 ) {return 0;} // have to start all over! |
---|
[819] | 601 | |
---|
[962] | 602 | //... then compute allowed z region z_min <= z <= z_max |
---|
| 603 | |
---|
| 604 | G4double Pz = std::sqrt(Pz2); |
---|
| 605 | G4double zMin = (std::sqrt(HadronMassT2+Pz2) - Pz)/std::sqrt(StringMT2); |
---|
| 606 | G4double zMax = (std::sqrt(HadronMassT2+Pz2) + Pz)/std::sqrt(StringMT2); |
---|
[819] | 607 | |
---|
[962] | 608 | //G4cout<<"Zmin max "<<zMin<<" "<<zMax<<G4endl; // Uzhi |
---|
[819] | 609 | |
---|
[962] | 610 | if (zMin >= zMax) return 0; // have to start all over! |
---|
| 611 | |
---|
| 612 | G4double z = GetLightConeZ(zMin, zMax, |
---|
| 613 | string->GetDecayParton()->GetPDGEncoding(), pHadron, |
---|
| 614 | HadronPt.x(), HadronPt.y()); |
---|
| 615 | |
---|
| 616 | //... now compute hadron longitudinal momentum and energy |
---|
| 617 | // longitudinal hadron momentum component HadronPz |
---|
[819] | 618 | |
---|
[962] | 619 | HadronPt.setZ(0.5* string->GetDecayDirection() * |
---|
| 620 | (z * string->LightConeDecay() - |
---|
| 621 | HadronMassT2/(z * string->LightConeDecay()))); |
---|
[819] | 622 | |
---|
[962] | 623 | G4double HadronE = 0.5* (z * string->LightConeDecay() + |
---|
| 624 | HadronMassT2/(z * string->LightConeDecay())); |
---|
[819] | 625 | |
---|
[962] | 626 | G4LorentzVector * a4Momentum= new G4LorentzVector(HadronPt,HadronE); |
---|
[819] | 627 | |
---|
[962] | 628 | //G4cout<<"Hadron Pt"<<HadronPt<<G4endl; |
---|
| 629 | //G4cout<<"Out of SplitEandP Pz E "<<HadronPt.getZ()<<" "<<HadronE<<G4endl; |
---|
[819] | 630 | |
---|
[962] | 631 | return a4Momentum; |
---|
[819] | 632 | } |
---|
| 633 | |
---|
[962] | 634 | //----------------------------------------------------------------------------------------- |
---|
| 635 | G4double G4LundStringFragmentation::GetLightConeZ(G4double zmin, G4double zmax, |
---|
| 636 | G4int PDGEncodingOfDecayParton, |
---|
| 637 | G4ParticleDefinition* pHadron, |
---|
| 638 | G4double Px, G4double Py) |
---|
[819] | 639 | { |
---|
[962] | 640 | G4double alund; |
---|
[819] | 641 | |
---|
[962] | 642 | // If blund get restored, you MUST adapt the calculation of zOfMaxyf. |
---|
| 643 | // const G4double blund = 1; |
---|
| 644 | |
---|
| 645 | G4double z, yf; |
---|
| 646 | G4double Mass = pHadron->GetPDGMass(); |
---|
| 647 | // G4int HadronEncoding=pHadron->GetPDGEncoding(); |
---|
| 648 | |
---|
| 649 | G4double Mt2 = Px*Px + Py*Py + Mass*Mass; |
---|
| 650 | |
---|
| 651 | if(std::abs(PDGEncodingOfDecayParton) < 1000) |
---|
| 652 | { |
---|
| 653 | // ---------------- Quark fragmentation ---------------------- |
---|
| 654 | alund=0.35/GeV/GeV; // Instead of 0.7 because kinks are not considered |
---|
| 655 | G4double zOfMaxyf=alund*Mt2/(alund*Mt2 + 1.); |
---|
| 656 | G4double maxYf=(1-zOfMaxyf)/zOfMaxyf * std::exp(-alund*Mt2/zOfMaxyf); |
---|
| 657 | |
---|
| 658 | do |
---|
| 659 | { |
---|
| 660 | z = zmin + G4UniformRand()*(zmax-zmin); |
---|
| 661 | // yf = std::pow(1. - z, blund)/z*std::exp(-alund*Mt2/z); |
---|
| 662 | yf = (1-z)/z * std::exp(-alund*Mt2/z); |
---|
| 663 | } |
---|
| 664 | while (G4UniformRand()*maxYf > yf); |
---|
| 665 | } |
---|
| 666 | else |
---|
| 667 | { |
---|
| 668 | // ---------------- Di-quark fragmentation ---------------------- |
---|
| 669 | //G4cout<<"Di-quark"<<G4endl; // Vova |
---|
| 670 | alund=0.7/GeV/GeV; // 0.7 2.0 |
---|
| 671 | G4double zOfMaxyf=alund*Mt2/(alund*Mt2 + 1.); |
---|
| 672 | G4double maxYf=(1-zOfMaxyf)/zOfMaxyf * std::exp(-alund*Mt2/zOfMaxyf); |
---|
| 673 | do |
---|
| 674 | { |
---|
| 675 | z = zmin + G4UniformRand()*(zmax-zmin); |
---|
| 676 | // yf = std::pow(1. - z, blund)/z*std::exp(-alund*Mt2/z); |
---|
| 677 | yf = (1-z)/z * std::exp(-alund*Mt2/z); |
---|
| 678 | } |
---|
| 679 | while (G4UniformRand()*maxYf > yf); |
---|
| 680 | }; |
---|
| 681 | |
---|
| 682 | //G4cout<<" test z "<<std::pow(2.,3.)<<" "<<z<<G4endl; |
---|
| 683 | return z; |
---|
| 684 | } |
---|