[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: G4LundStringFragmentation.cc,v 1.18 2009/10/05 12:52:48 vuzhinsk Exp $ |
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[1228] | 28 | // GEANT4 tag $Name: geant4-09-03 $ 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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[1196] | 60 | // SetStringTensionParameter(0.25); // Uzhi 20 June 08 |
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| 61 | SetStringTensionParameter(1.); // Uzhi 20 June 09 |
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[819] | 62 | } |
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| 63 | |
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[962] | 64 | // -------------------------------------------------------------- |
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[819] | 65 | G4LundStringFragmentation::G4LundStringFragmentation(const G4LundStringFragmentation &) : G4VLongitudinalStringDecay() |
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| 66 | { |
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| 67 | } |
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| 68 | |
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| 69 | G4LundStringFragmentation::~G4LundStringFragmentation() |
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| 70 | { |
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| 71 | } |
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| 72 | |
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[962] | 73 | //************************************************************************************* |
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[819] | 74 | |
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| 75 | const G4LundStringFragmentation & G4LundStringFragmentation::operator=(const G4LundStringFragmentation &) |
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| 76 | { |
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| 77 | throw G4HadronicException(__FILE__, __LINE__, "G4LundStringFragmentation::operator= meant to not be accessable"); |
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| 78 | return *this; |
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| 79 | } |
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| 80 | |
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| 81 | int G4LundStringFragmentation::operator==(const G4LundStringFragmentation &right) const |
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| 82 | { |
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| 83 | return !memcmp(this, &right, sizeof(G4LundStringFragmentation)); |
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| 84 | } |
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| 85 | |
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| 86 | int G4LundStringFragmentation::operator!=(const G4LundStringFragmentation &right) const |
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| 87 | { |
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| 88 | return memcmp(this, &right, sizeof(G4LundStringFragmentation)); |
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| 89 | } |
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| 90 | |
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[962] | 91 | //-------------------------------------------------------------------------------------- |
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| 92 | void G4LundStringFragmentation::SetMinimalStringMass(const G4FragmentingString * const string) // Uzhi |
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| 93 | { |
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| 94 | /* |
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| 95 | G4cout<<"In SetMinMass -------------------"<<std::sqrt(string->Mass2())<<G4endl; |
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| 96 | G4cout<<string->GetLeftParton()->GetPDGEncoding()<<" "<< |
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| 97 | string->GetRightParton()->GetPDGEncoding()<<G4endl; |
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| 98 | */ |
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| 99 | G4double EstimatedMass=0.; |
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| 100 | G4int Number_of_quarks=0; |
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[819] | 101 | |
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[962] | 102 | G4int Qleft =std::abs(string->GetLeftParton()->GetPDGEncoding()); |
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| 103 | |
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| 104 | if( Qleft > 1000) |
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| 105 | { |
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| 106 | Number_of_quarks+=2; |
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| 107 | G4int q1=Qleft/1000; |
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| 108 | if( q1 < 3) {EstimatedMass +=Mass_of_light_quark;} |
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| 109 | if( q1 > 2) {EstimatedMass +=Mass_of_heavy_quark;} |
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| 110 | |
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| 111 | G4int q2=(Qleft/100)%10; |
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| 112 | if( q2 < 3) {EstimatedMass +=Mass_of_light_quark;} |
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| 113 | if( q2 > 2) {EstimatedMass +=Mass_of_heavy_quark;} |
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| 114 | EstimatedMass +=Mass_of_string_junction; |
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| 115 | } |
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| 116 | else |
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| 117 | { |
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| 118 | Number_of_quarks++; |
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| 119 | if( Qleft < 3) {EstimatedMass +=Mass_of_light_quark;} |
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| 120 | if( Qleft > 2) {EstimatedMass +=Mass_of_heavy_quark;} |
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| 121 | } |
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| 122 | |
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| 123 | G4int Qright=std::abs(string->GetRightParton()->GetPDGEncoding()); |
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| 124 | |
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| 125 | if( Qright > 1000) |
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| 126 | { |
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| 127 | Number_of_quarks+=2; |
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| 128 | G4int q1=Qright/1000; |
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| 129 | if( q1 < 3) {EstimatedMass +=Mass_of_light_quark;} |
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| 130 | if( q1 > 2) {EstimatedMass +=Mass_of_heavy_quark;} |
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| 131 | |
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| 132 | G4int q2=(Qright/100)%10; |
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| 133 | if( q2 < 3) {EstimatedMass +=Mass_of_light_quark;} |
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| 134 | if( q2 > 2) {EstimatedMass +=Mass_of_heavy_quark;} |
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| 135 | EstimatedMass +=Mass_of_string_junction; |
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| 136 | } |
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| 137 | else |
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| 138 | { |
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| 139 | Number_of_quarks++; |
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| 140 | if( Qright < 3) {EstimatedMass +=Mass_of_light_quark;} |
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| 141 | if( Qright > 2) {EstimatedMass +=Mass_of_heavy_quark;} |
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| 142 | } |
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| 143 | |
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| 144 | if(Number_of_quarks==2){EstimatedMass +=100.*MeV;} |
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| 145 | if(Number_of_quarks==3){EstimatedMass += 20.*MeV;} |
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| 146 | if(Number_of_quarks==4){EstimatedMass -=2.*Mass_of_string_junction; |
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| 147 | if(EstimatedMass <= 1600.*MeV){EstimatedMass-=200.*MeV;} |
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| 148 | else {EstimatedMass+=100.*MeV;} |
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| 149 | } |
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| 150 | MinimalStringMass=EstimatedMass; |
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| 151 | SetMinimalStringMass2(EstimatedMass); |
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| 152 | //G4cout<<"Out SetMinimalStringMass "<<MinimalStringMass<<G4endl; |
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| 153 | } |
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| 154 | |
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| 155 | //-------------------------------------------------------------------------------------- |
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| 156 | void G4LundStringFragmentation::SetMinimalStringMass2( |
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| 157 | const G4double aValue) |
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[819] | 158 | { |
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[962] | 159 | MinimalStringMass2=aValue * aValue; |
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| 160 | } |
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[819] | 161 | |
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[962] | 162 | //-------------------------------------------------------------------------------------- |
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| 163 | G4KineticTrackVector* G4LundStringFragmentation::FragmentString( |
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| 164 | const G4ExcitedString& theString) |
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| 165 | { |
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| 166 | |
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[819] | 167 | //G4cout<<"In FragmentString"<<G4endl; |
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| 168 | |
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| 169 | // Can no longer modify Parameters for Fragmentation. |
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| 170 | PastInitPhase=true; |
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| 171 | |
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| 172 | // check if string has enough mass to fragment... |
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[962] | 173 | |
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| 174 | SetMassCut(160.*MeV); // For LightFragmentationTest it is required |
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| 175 | // that no one pi-meson can be produced |
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| 176 | /* |
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| 177 | G4cout<<G4endl<<"G4LundStringFragmentation::"<<G4endl; |
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| 178 | G4cout<<"FragmentString Position"<<theString.GetPosition()/fermi<<" "<< |
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| 179 | theString.GetTimeOfCreation()/fermi<<G4endl; |
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| 180 | G4cout<<"FragmentString Momentum"<<theString.Get4Momentum()<<theString.Get4Momentum().mag()<<G4endl; |
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| 181 | */ |
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[819] | 182 | G4KineticTrackVector * LeftVector=LightFragmentationTest(&theString); |
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| 183 | if ( LeftVector != 0 ) { |
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[962] | 184 | //G4cout<<"Return single hadron insted of string"<<G4endl; |
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| 185 | // Uzhi insert 6.05.08 start |
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| 186 | if(LeftVector->size() == 1){ |
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| 187 | // One hadron is saved in the interaction |
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| 188 | LeftVector->operator[](0)->SetFormationTime(theString.GetTimeOfCreation()); |
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| 189 | LeftVector->operator[](0)->SetPosition(theString.GetPosition()); |
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| 190 | |
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| 191 | /* // To set large formation time open * |
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| 192 | LeftVector->operator[](0)->SetFormationTime(theString.GetTimeOfCreation()+100.*fermi); |
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| 193 | LeftVector->operator[](0)->SetPosition(theString.GetPosition()); |
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| 194 | G4ThreeVector aPosition(theString.GetPosition().x(), |
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| 195 | theString.GetPosition().y(), |
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| 196 | theString.GetPosition().z()+100.*fermi); |
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| 197 | LeftVector->operator[](0)->SetPosition(aPosition); |
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| 198 | */ |
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[1196] | 199 | //G4cout<<"Single hadron "<<LeftVector->operator[](0)->Get4Momentum()<<" "<<LeftVector->operator[](0)->Get4Momentum().mag()<<G4endl; |
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[962] | 200 | } else { // 2 hadrons created from qq-qqbar are stored |
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| 201 | LeftVector->operator[](0)->SetFormationTime(theString.GetTimeOfCreation()); |
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| 202 | LeftVector->operator[](0)->SetPosition(theString.GetPosition()); |
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| 203 | LeftVector->operator[](1)->SetFormationTime(theString.GetTimeOfCreation()); |
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| 204 | LeftVector->operator[](1)->SetPosition(theString.GetPosition()); |
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| 205 | } |
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| 206 | // Uzhi insert 6.05.08 end |
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| 207 | return LeftVector; |
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| 208 | } |
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| 209 | |
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| 210 | //--------------------- The string can fragment ------------------------------- |
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| 211 | //--------------- At least two particles can be produced ---------------------- |
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| 212 | |
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| 213 | LeftVector =new G4KineticTrackVector; |
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[819] | 214 | G4KineticTrackVector * RightVector=new G4KineticTrackVector; |
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| 215 | |
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| 216 | G4ExcitedString *theStringInCMS=CPExcited(theString); |
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| 217 | G4LorentzRotation toCms=theStringInCMS->TransformToAlignedCms(); |
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| 218 | |
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| 219 | G4bool success=false, inner_sucess=true; |
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| 220 | G4int attempt=0; |
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| 221 | while ( !success && attempt++ < StringLoopInterrupt ) |
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[962] | 222 | { // If the string fragmentation do not be happend, repeat the fragmentation--- |
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[819] | 223 | G4FragmentingString *currentString=new G4FragmentingString(*theStringInCMS); |
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| 224 | |
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[962] | 225 | //G4cout<<"FragmentString cur M2 "<<std::sqrt(currentString->Mass2())<<G4endl; |
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| 226 | // Cleaning up the previously produced hadrons ------------------------------ |
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| 227 | std::for_each(LeftVector->begin() , LeftVector->end() , DeleteKineticTrack()); |
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| 228 | LeftVector->clear(); |
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[819] | 229 | |
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| 230 | std::for_each(RightVector->begin(), RightVector->end(), DeleteKineticTrack()); |
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| 231 | RightVector->clear(); |
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| 232 | |
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[962] | 233 | // Main fragmentation loop until the string will not be able to fragment ---- |
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[819] | 234 | inner_sucess=true; // set false on failure.. |
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| 235 | while (! StopFragmenting(currentString) ) |
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| 236 | { // Split current string into hadron + new string |
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| 237 | G4FragmentingString *newString=0; // used as output from SplitUp... |
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| 238 | |
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| 239 | //G4cout<<"FragmentString to Splitup ===================================="<<G4endl; |
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[962] | 240 | //G4cout<<"++++++++++++++++++++++++++ Enter num--------------------------"<<G4endl; |
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[819] | 241 | //G4int Uzhi; G4cin>>Uzhi; // Uzhi |
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[962] | 242 | |
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[819] | 243 | G4KineticTrack * Hadron=Splitup(currentString,newString); |
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| 244 | //G4cout<<" Hadron "<<Hadron<<G4endl; |
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| 245 | |
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[962] | 246 | if ( Hadron != 0 ) // Store the hadron |
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[819] | 247 | { |
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| 248 | if ( currentString->GetDecayDirection() > 0 ) |
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| 249 | LeftVector->push_back(Hadron); |
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| 250 | else |
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| 251 | RightVector->push_back(Hadron); |
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| 252 | delete currentString; |
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| 253 | currentString=newString; |
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[962] | 254 | } |
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[819] | 255 | }; |
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[962] | 256 | // Split remaining string into 2 final Hadrons ------------------------ |
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[819] | 257 | //G4cout<<"FragmentString to SplitLast if inner_sucess#0"<<inner_sucess<<G4endl; |
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[962] | 258 | if ( inner_sucess && |
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[819] | 259 | SplitLast(currentString,LeftVector, RightVector) ) |
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| 260 | { |
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| 261 | success=true; |
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| 262 | } |
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| 263 | delete currentString; |
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[962] | 264 | } // End of the loop in attemps to fragment the string |
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[819] | 265 | |
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| 266 | delete theStringInCMS; |
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| 267 | |
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| 268 | if ( ! success ) |
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| 269 | { |
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| 270 | std::for_each(LeftVector->begin(), LeftVector->end(), DeleteKineticTrack()); |
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| 271 | LeftVector->clear(); |
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| 272 | std::for_each(RightVector->begin(), RightVector->end(), DeleteKineticTrack()); |
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| 273 | delete RightVector; |
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| 274 | return LeftVector; |
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| 275 | } |
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| 276 | |
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| 277 | // Join Left- and RightVector into LeftVector in correct order. |
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| 278 | while(!RightVector->empty()) |
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| 279 | { |
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| 280 | LeftVector->push_back(RightVector->back()); |
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| 281 | RightVector->erase(RightVector->end()-1); |
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| 282 | } |
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| 283 | delete RightVector; |
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| 284 | |
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| 285 | //G4cout<<"CalculateHadronTimePosition"<<G4endl; |
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| 286 | |
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| 287 | CalculateHadronTimePosition(theString.Get4Momentum().mag(), LeftVector); |
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| 288 | |
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| 289 | G4LorentzRotation toObserverFrame(toCms.inverse()); |
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| 290 | |
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[962] | 291 | // LeftVector->operator[](0)->SetFormationTime(theString.GetTimeOfCreation()); |
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| 292 | // LeftVector->operator[](0)->SetPosition(theString.GetPosition()); |
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| 293 | |
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| 294 | G4double TimeOftheStringCreation=theString.GetTimeOfCreation(); |
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| 295 | G4ThreeVector PositionOftheStringCreation(theString.GetPosition()); |
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[1196] | 296 | // Uzhi 11.07.09 |
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| 297 | //G4cout<<" String T Pos"<<TimeOftheStringCreation<<' '<<PositionOftheStringCreation<<G4endl; |
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[962] | 298 | /* // For large formation time open * |
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| 299 | G4double TimeOftheStringCreation=theString.GetTimeOfCreation()+100*fermi; |
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| 300 | G4ThreeVector PositionOftheStringCreation(theString.GetPosition().x(), |
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| 301 | theString.GetPosition().y(), |
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| 302 | theString.GetPosition().z()+100*fermi); |
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| 303 | */ |
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| 304 | |
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| 305 | /* |
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| 306 | if(theString.GetPosition().y() > 100.*fermi){ |
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| 307 | // It is a projectile-like string ------------------------------------- |
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| 308 | G4double Zmin=theString.GetPosition().y()-1000.*fermi; |
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| 309 | G4double Zmax=theString.GetPosition().z(); |
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| 310 | TimeOftheStringCreation= |
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| 311 | (Zmax-Zmin)*theString.Get4Momentum().e()/theString.Get4Momentum().z(); |
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| 312 | |
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| 313 | G4ThreeVector aPosition(0.,0.,Zmax); |
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| 314 | PositionOftheStringCreation=aPosition; |
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| 315 | } |
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| 316 | */ |
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[1196] | 317 | |
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| 318 | //G4cout<<"Lund Frag # hadrons"<<LeftVector->size()<<G4endl; // Uzhi 11.07.09 |
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[819] | 319 | for(size_t C1 = 0; C1 < LeftVector->size(); C1++) |
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| 320 | { |
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| 321 | G4KineticTrack* Hadron = LeftVector->operator[](C1); |
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| 322 | G4LorentzVector Momentum = Hadron->Get4Momentum(); |
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| 323 | Momentum = toObserverFrame*Momentum; |
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| 324 | Hadron->Set4Momentum(Momentum); |
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[962] | 325 | |
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[819] | 326 | G4LorentzVector Coordinate(Hadron->GetPosition(), Hadron->GetFormationTime()); |
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| 327 | Momentum = toObserverFrame*Coordinate; |
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[1196] | 328 | Hadron->SetFormationTime(TimeOftheStringCreation+Momentum.e() // Uzhi 11.07.09 |
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| 329 | -fermi/c_light); // Uzhi 11.07.09 |
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[819] | 330 | G4ThreeVector aPosition(Momentum.vect()); |
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[962] | 331 | // Hadron->SetPosition(theString.GetPosition()+aPosition); |
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| 332 | Hadron->SetPosition(PositionOftheStringCreation+aPosition); |
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| 333 | //G4cout<<"Hadron "<<C1<<" "<<Hadron->GetPosition()/fermi<<" "<<Hadron->GetFormationTime()/fermi<<G4endl; |
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[1196] | 334 | /* // Uzhi 11.07.09 |
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| 335 | G4cout<<C1<<' '<<Hadron->GetDefinition()->GetParticleName()<<G4endl; |
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| 336 | G4cout<<Hadron->GetDefinition()->GetPDGMass()<<' ' |
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| 337 | <<Hadron->Get4Momentum()<<G4endl; |
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| 338 | G4cout<<Hadron->GetFormationTime()<<' ' |
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| 339 | <<Hadron->GetPosition()<<' ' |
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| 340 | <<Hadron->GetPosition().z()/fermi<<G4endl; |
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| 341 | */ // Uzhi |
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[962] | 342 | }; |
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[819] | 343 | |
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| 344 | //G4cout<<"Out FragmentString"<<G4endl; |
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| 345 | return LeftVector; |
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| 346 | |
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[962] | 347 | } |
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[819] | 348 | |
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[962] | 349 | //---------------------------------------------------------------------------------- |
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| 350 | G4bool G4LundStringFragmentation::IsFragmentable(const G4FragmentingString * const string) |
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| 351 | { |
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| 352 | //G4cout<<"In IsFragmentable"<<G4endl; |
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| 353 | SetMinimalStringMass(string); // Uzhi |
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| 354 | //G4cout<<"Out IsFragmentable MinMass"<<MinimalStringMass<<" String Mass"<<std::sqrt(string->Get4Momentum().mag2())<<G4endl; |
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| 355 | return sqr(MinimalStringMass + WminLUND) < string->Get4Momentum().mag2(); // Uzhi |
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[819] | 356 | |
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[962] | 357 | // return sqr(FragmentationMass(string)+MassCut) < // Uzhi |
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| 358 | // string->Mass2(); // Uzhi |
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[819] | 359 | } |
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| 360 | |
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[962] | 361 | //---------------------------------------------------------------------------------------- |
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| 362 | G4bool G4LundStringFragmentation::StopFragmenting(const G4FragmentingString * const string) |
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| 363 | { |
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| 364 | //G4cout<<"StopFragmenting"<<G4endl; |
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[819] | 365 | |
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[962] | 366 | SetMinimalStringMass(string); |
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[819] | 367 | |
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[962] | 368 | //G4cout<<"StopFragm MinMass "<<MinimalStringMass<<" String Mass "<<std::sqrt(string->Get4Momentum().mag2())<<G4endl; |
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[819] | 369 | |
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[962] | 370 | return (MinimalStringMass + WminLUND)* |
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| 371 | (1 + SmoothParam * (1.-2*G4UniformRand())) > |
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| 372 | string->Mass(); |
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[819] | 373 | } |
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| 374 | |
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[962] | 375 | //---------------------------------------------------------------------------------------- |
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[819] | 376 | G4bool G4LundStringFragmentation::SplitLast(G4FragmentingString * string, |
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| 377 | G4KineticTrackVector * LeftVector, |
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| 378 | G4KineticTrackVector * RightVector) |
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| 379 | { |
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| 380 | //... perform last cluster decay |
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[962] | 381 | /* |
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| 382 | G4cout<<"SplitLast String mass "<<string->Mass()<<G4endl; |
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| 383 | G4cout<<string->GetLeftParton()->GetPDGEncoding()<<" "<<G4endl; |
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| 384 | G4cout<<string->GetRightParton()->GetPDGEncoding()<<" "<<G4endl; |
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| 385 | */ |
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| 386 | G4LorentzVector Str4Mom=string->Get4Momentum(); |
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| 387 | //G4cout<<"String 4 momentum "<<Str4Mom<<G4endl; |
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[819] | 388 | G4ThreeVector ClusterVel =string->Get4Momentum().boostVector(); |
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| 389 | |
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| 390 | G4double ResidualMass = string->Mass(); |
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| 391 | |
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[962] | 392 | G4ParticleDefinition * LeftHadron, * RightHadron; |
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| 393 | |
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[819] | 394 | G4int cClusterInterrupt = 0; |
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| 395 | do |
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| 396 | { |
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| 397 | //G4cout<<" Cicle "<<cClusterInterrupt<<" "<< ClusterLoopInterrupt<<G4endl; |
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| 398 | |
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| 399 | if (cClusterInterrupt++ >= ClusterLoopInterrupt) |
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| 400 | { |
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| 401 | return false; |
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| 402 | } |
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| 403 | G4ParticleDefinition * quark = NULL; |
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| 404 | string->SetLeftPartonStable(); // to query quark contents.. |
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| 405 | |
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[962] | 406 | if (!string->FourQuarkString() ) |
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| 407 | { |
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| 408 | // The string is q-qbar, or q-qq, or qbar-qqbar type |
---|
| 409 | if (string->DecayIsQuark() && string->StableIsQuark() ) |
---|
| 410 | { |
---|
| 411 | //... there are quarks on cluster ends |
---|
| 412 | LeftHadron= QuarkSplitup(string->GetLeftParton(), quark); |
---|
| 413 | } else |
---|
| 414 | { |
---|
| 415 | //... there is a Diquark on one of the cluster ends |
---|
| 416 | G4int IsParticle; |
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[819] | 417 | |
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[962] | 418 | if ( string->StableIsQuark() ) |
---|
| 419 | { |
---|
| 420 | IsParticle=(string->GetLeftParton()->GetPDGEncoding()>0) ? -1 : +1; |
---|
| 421 | } else |
---|
| 422 | { |
---|
| 423 | IsParticle=(string->GetLeftParton()->GetPDGEncoding()>0) ? +1 : -1; |
---|
| 424 | } |
---|
[819] | 425 | |
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[962] | 426 | pDefPair QuarkPair = CreatePartonPair(IsParticle,false); // no diquarks wanted |
---|
| 427 | quark = QuarkPair.second; |
---|
[819] | 428 | |
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[962] | 429 | LeftHadron=hadronizer->Build(QuarkPair.first, string->GetLeftParton()); |
---|
| 430 | } |
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[819] | 431 | |
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[962] | 432 | RightHadron = hadronizer->Build(string->GetRightParton(), quark); |
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| 433 | } else |
---|
| 434 | { |
---|
| 435 | // The string is qq-qqbar type. Diquarks are on the string ends |
---|
| 436 | G4int LiftQuark1= string->GetLeftParton()->GetPDGEncoding()/1000; |
---|
| 437 | G4int LiftQuark2=(string->GetLeftParton()->GetPDGEncoding()/100)%10; |
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[819] | 438 | |
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[962] | 439 | G4int RightQuark1= string->GetRightParton()->GetPDGEncoding()/1000; |
---|
| 440 | G4int RightQuark2=(string->GetRightParton()->GetPDGEncoding()/100)%10; |
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[819] | 441 | |
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[962] | 442 | if(G4UniformRand()<0.5) |
---|
| 443 | { |
---|
| 444 | LeftHadron =hadronizer->Build(FindParticle( LiftQuark1), |
---|
| 445 | FindParticle(RightQuark1)); |
---|
| 446 | RightHadron=hadronizer->Build(FindParticle( LiftQuark2), |
---|
| 447 | FindParticle(RightQuark2)); |
---|
| 448 | } else |
---|
| 449 | { |
---|
| 450 | LeftHadron =hadronizer->Build(FindParticle( LiftQuark1), |
---|
| 451 | FindParticle(RightQuark2)); |
---|
| 452 | RightHadron=hadronizer->Build(FindParticle( LiftQuark2), |
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| 453 | FindParticle(RightQuark1)); |
---|
| 454 | } |
---|
| 455 | } |
---|
| 456 | /* |
---|
| 457 | G4cout<<"SplitLast Left Right hadrons "<<LeftHadron->GetPDGEncoding()<<" "<<RightHadron->GetPDGEncoding()<<G4endl; |
---|
| 458 | G4cout<<"SplitLast Left Right hadrons "<<LeftHadron->GetPDGMass()<<" "<<RightHadron->GetPDGMass()<<G4endl; |
---|
| 459 | G4cout<<"Sum H mass Str Mass "<<LeftHadron->GetPDGMass() + RightHadron->GetPDGMass()<<" "<<ResidualMass<<G4endl; |
---|
| 460 | */ |
---|
[819] | 461 | //... repeat procedure, if mass of cluster is too low to produce hadrons |
---|
| 462 | //... ClusterMassCut = 0.15*GeV model parameter |
---|
| 463 | |
---|
| 464 | } |
---|
[962] | 465 | while (ResidualMass <= LeftHadron->GetPDGMass() + RightHadron->GetPDGMass());// UzhiVOVA |
---|
| 466 | |
---|
[819] | 467 | //... compute hadron momenta and energies |
---|
| 468 | |
---|
| 469 | G4LorentzVector LeftMom, RightMom; |
---|
| 470 | G4ThreeVector Pos; |
---|
| 471 | |
---|
[962] | 472 | Sample4Momentum(&LeftMom, LeftHadron->GetPDGMass(), |
---|
| 473 | &RightMom, RightHadron->GetPDGMass(), |
---|
| 474 | ResidualMass); |
---|
[819] | 475 | |
---|
| 476 | LeftMom.boost(ClusterVel); |
---|
| 477 | RightMom.boost(ClusterVel); |
---|
| 478 | |
---|
| 479 | LeftVector->push_back(new G4KineticTrack(LeftHadron, 0, Pos, LeftMom)); |
---|
| 480 | RightVector->push_back(new G4KineticTrack(RightHadron, 0, Pos, RightMom)); |
---|
| 481 | |
---|
[962] | 482 | //G4cout<<"Out SplitLast "<<G4endl; |
---|
[819] | 483 | return true; |
---|
| 484 | |
---|
| 485 | } |
---|
| 486 | |
---|
| 487 | //---------------------------------------------------------------------------------------------------------- |
---|
| 488 | |
---|
[962] | 489 | void G4LundStringFragmentation::Sample4Momentum(G4LorentzVector* Mom, G4double Mass, G4LorentzVector* AntiMom, G4double AntiMass, G4double InitialMass) |
---|
| 490 | { |
---|
| 491 | // ------ Sampling of momenta of 2 last produced hadrons -------------------- |
---|
| 492 | G4ThreeVector Pt; |
---|
| 493 | G4double MassMt2, AntiMassMt2; |
---|
| 494 | G4double AvailablePz, AvailablePz2; |
---|
[819] | 495 | |
---|
[962] | 496 | //G4cout<<"Sample4Momentum "<<G4endl; |
---|
| 497 | //G4cout<<"Sample4Momentum Mass"<<Mass<<" "<<AntiMass<<" "<<InitialMass<<G4endl; |
---|
| 498 | |
---|
| 499 | if(Mass > 930. || AntiMass > 930.) // If there is a baryon |
---|
| 500 | { |
---|
| 501 | // ----------------- Isotripic decay ------------------------------------ |
---|
| 502 | G4double r_val = sqr(InitialMass*InitialMass - Mass*Mass - AntiMass*AntiMass) - |
---|
| 503 | sqr(2.*Mass*AntiMass); |
---|
| 504 | G4double Pabs = (r_val > 0.)? std::sqrt(r_val)/(2.*InitialMass) : 0; |
---|
[819] | 505 | |
---|
[962] | 506 | //... sample unit vector |
---|
| 507 | G4double pz = 1. - 2.*G4UniformRand(); |
---|
| 508 | G4double st = std::sqrt(1. - pz * pz)*Pabs; |
---|
| 509 | G4double phi = 2.*pi*G4UniformRand(); |
---|
| 510 | G4double px = st*std::cos(phi); |
---|
| 511 | G4double py = st*std::sin(phi); |
---|
| 512 | pz *= Pabs; |
---|
| 513 | |
---|
| 514 | Mom->setPx(px); Mom->setPy(py); Mom->setPz(pz); |
---|
| 515 | Mom->setE(std::sqrt(Pabs*Pabs + Mass*Mass)); |
---|
[819] | 516 | |
---|
[962] | 517 | AntiMom->setPx(-px); AntiMom->setPy(-py); AntiMom->setPz(-pz); |
---|
| 518 | AntiMom->setE (std::sqrt(Pabs*Pabs + AntiMass*AntiMass)); |
---|
| 519 | } |
---|
| 520 | else |
---|
| 521 | { |
---|
| 522 | do |
---|
[1055] | 523 | { |
---|
| 524 | // GF 22-May-09, limit sampled pt to allowed range |
---|
| 525 | |
---|
| 526 | G4double termD = InitialMass*InitialMass -Mass*Mass - AntiMass*AntiMass; |
---|
| 527 | G4double termab = 4*sqr(Mass*AntiMass); |
---|
| 528 | G4double termN = 2*termD + 4*Mass*Mass + 4*AntiMass*AntiMass; |
---|
| 529 | G4double pt2max=(termD*termD - termab )/ termN ; |
---|
| 530 | |
---|
| 531 | // G4cout << " termD, ab, N " << termD << " " << termab << " " << termN |
---|
| 532 | // << " pt2max= " << pt2max ; |
---|
| 533 | |
---|
[1196] | 534 | Pt=SampleQuarkPt(std::sqrt(pt2max)); Pt.setZ(0); G4double Pt2=Pt.mag2(); |
---|
[819] | 535 | |
---|
[1055] | 536 | |
---|
| 537 | // G4cout << " sampled Pt2 = " << Pt2 << " " << pt2max-Pt2 << G4endl; |
---|
| 538 | // end.. GF |
---|
| 539 | |
---|
[819] | 540 | //G4cout<<"Sample4Momentum Pt x y "<<Pt.getX()<<" "<<Pt.getY()<<G4endl; |
---|
| 541 | |
---|
[962] | 542 | MassMt2 = Mass * Mass + Pt2; |
---|
| 543 | AntiMassMt2= AntiMass * AntiMass + Pt2; |
---|
[819] | 544 | |
---|
| 545 | //G4cout<<"Mts "<<MassMt2<<" "<<AntiMassMt2<<" "<<InitialMass*InitialMass<<G4endl; |
---|
| 546 | |
---|
[962] | 547 | AvailablePz2= sqr(InitialMass*InitialMass - MassMt2 - AntiMassMt2) - |
---|
| 548 | 4.*MassMt2*AntiMassMt2; |
---|
| 549 | } |
---|
[1055] | 550 | while(AvailablePz2 < 0.); // GF will occur only for numerical precision problem with limit in sampled pt |
---|
[962] | 551 | |
---|
| 552 | AvailablePz2 /=(4.*InitialMass*InitialMass); |
---|
| 553 | AvailablePz = std::sqrt(AvailablePz2); |
---|
[819] | 554 | |
---|
| 555 | //G4cout<<"AvailablePz "<<AvailablePz<<G4endl; |
---|
| 556 | |
---|
[962] | 557 | G4double Px=Pt.getX(); |
---|
| 558 | G4double Py=Pt.getY(); |
---|
[819] | 559 | |
---|
[962] | 560 | //if(Mass > AntiMass){AvailablePz=-AvailablePz;} // May30 // Uzhi |
---|
[819] | 561 | |
---|
[962] | 562 | Mom->setPx(Px); Mom->setPy(Py); Mom->setPz(AvailablePz); |
---|
| 563 | Mom->setE(std::sqrt(MassMt2+AvailablePz2)); |
---|
| 564 | |
---|
[819] | 565 | //G4cout<<" 1 part "<<Px<<" "<<Py<<" "<<AvailablePz<<" "<<std::sqrt(MassMt2+AvailablePz2)<<G4endl; |
---|
| 566 | |
---|
[962] | 567 | AntiMom->setPx(-Px); AntiMom->setPy(-Py); AntiMom->setPz(-AvailablePz); |
---|
| 568 | AntiMom->setE (std::sqrt(AntiMassMt2+AvailablePz2)); |
---|
[819] | 569 | |
---|
| 570 | //G4cout<<" 2 part "<<-Px<<" "<<-Py<<" "<<-AvailablePz<<" "<<std::sqrt(AntiMassMt2+AvailablePz2)<<G4endl; |
---|
[962] | 571 | } |
---|
[819] | 572 | |
---|
[962] | 573 | //G4cout<<"Out Sample4Momentum "<<G4endl; |
---|
| 574 | } |
---|
[819] | 575 | |
---|
[962] | 576 | //----------------------------------------------------------------------------- |
---|
[819] | 577 | |
---|
[962] | 578 | G4LorentzVector * G4LundStringFragmentation::SplitEandP(G4ParticleDefinition * pHadron, |
---|
| 579 | G4FragmentingString * string, G4FragmentingString * newString) |
---|
| 580 | { |
---|
| 581 | /* |
---|
| 582 | G4cout<<"SplitEandP "<<G4endl; |
---|
| 583 | G4cout<<"SplitEandP string mass "<<string->Mass()<<G4endl; |
---|
| 584 | G4cout<<string->GetLeftParton()->GetPDGEncoding()<<" " |
---|
| 585 | <<string->GetRightParton()->GetPDGEncoding()<<" "<<G4endl; |
---|
| 586 | G4cout<<G4endl; |
---|
| 587 | G4cout<<newString->GetLeftParton()->GetPDGEncoding()<<" "<<G4endl; |
---|
| 588 | G4cout<<newString->GetRightParton()->GetPDGEncoding()<<" "<<G4endl; |
---|
| 589 | */ |
---|
| 590 | G4LorentzVector String4Momentum=string->Get4Momentum(); |
---|
| 591 | G4double StringMT2=string->Get4Momentum().mt2(); |
---|
| 592 | //G4cout<<"StringMt2 "<<StringMT2<<G4endl; |
---|
[819] | 593 | |
---|
[962] | 594 | G4double HadronMass = pHadron->GetPDGMass(); |
---|
| 595 | //G4cout<<"Hadron mass "<<HadronMass<<" "<<pHadron->GetParticleName()<<G4endl; |
---|
[819] | 596 | |
---|
[962] | 597 | SetMinimalStringMass(newString); |
---|
| 598 | String4Momentum.setPz(0.); |
---|
| 599 | G4ThreeVector StringPt=String4Momentum.vect(); |
---|
| 600 | //G4cout<<"StringPt "<<StringPt<<G4endl<<G4endl; |
---|
| 601 | //G4cout<<"Min string mass "<<MinimalStringMass<<G4endl; |
---|
[819] | 602 | |
---|
[962] | 603 | // calculate and assign hadron transverse momentum component HadronPx and HadronPy |
---|
| 604 | G4ThreeVector thePt; |
---|
| 605 | thePt=SampleQuarkPt(); |
---|
[819] | 606 | |
---|
[962] | 607 | G4ThreeVector HadronPt = thePt +string->DecayPt(); |
---|
| 608 | HadronPt.setZ(0); |
---|
| 609 | //G4cout<<"Hadron Pt"<<HadronPt<<G4endl; |
---|
[819] | 610 | |
---|
[962] | 611 | G4ThreeVector RemSysPt = StringPt - HadronPt; |
---|
| 612 | //G4cout<<"RemSys Pt"<<RemSysPt<<G4endl; |
---|
[819] | 613 | |
---|
[962] | 614 | //... sample z to define hadron longitudinal momentum and energy |
---|
| 615 | //... but first check the available phase space |
---|
[819] | 616 | |
---|
[962] | 617 | G4double HadronMassT2 = sqr(HadronMass) + HadronPt.mag2(); |
---|
| 618 | G4double ResidualMassT2=sqr(MinimalStringMass) + RemSysPt.mag2(); |
---|
[819] | 619 | |
---|
[962] | 620 | //G4cout<<"Mt h res str "<<std::sqrt(HadronMassT2)<<" "<<std::sqrt(ResidualMassT2)<<" srt mass"<<StringMT2<<G4endl; |
---|
[819] | 621 | |
---|
[962] | 622 | G4double Pz2 = (sqr(StringMT2 - HadronMassT2 - ResidualMassT2) - |
---|
| 623 | 4*HadronMassT2 * ResidualMassT2)/4./StringMT2; |
---|
[819] | 624 | |
---|
[962] | 625 | //G4cout<<"Pz**2 "<<Pz2<<G4endl; |
---|
[819] | 626 | |
---|
[962] | 627 | if(Pz2 < 0 ) {return 0;} // have to start all over! |
---|
[819] | 628 | |
---|
[962] | 629 | //... then compute allowed z region z_min <= z <= z_max |
---|
| 630 | |
---|
| 631 | G4double Pz = std::sqrt(Pz2); |
---|
| 632 | G4double zMin = (std::sqrt(HadronMassT2+Pz2) - Pz)/std::sqrt(StringMT2); |
---|
| 633 | G4double zMax = (std::sqrt(HadronMassT2+Pz2) + Pz)/std::sqrt(StringMT2); |
---|
[819] | 634 | |
---|
[962] | 635 | //G4cout<<"Zmin max "<<zMin<<" "<<zMax<<G4endl; // Uzhi |
---|
[819] | 636 | |
---|
[962] | 637 | if (zMin >= zMax) return 0; // have to start all over! |
---|
| 638 | |
---|
| 639 | G4double z = GetLightConeZ(zMin, zMax, |
---|
| 640 | string->GetDecayParton()->GetPDGEncoding(), pHadron, |
---|
| 641 | HadronPt.x(), HadronPt.y()); |
---|
| 642 | |
---|
| 643 | //... now compute hadron longitudinal momentum and energy |
---|
| 644 | // longitudinal hadron momentum component HadronPz |
---|
[819] | 645 | |
---|
[962] | 646 | HadronPt.setZ(0.5* string->GetDecayDirection() * |
---|
| 647 | (z * string->LightConeDecay() - |
---|
| 648 | HadronMassT2/(z * string->LightConeDecay()))); |
---|
[819] | 649 | |
---|
[962] | 650 | G4double HadronE = 0.5* (z * string->LightConeDecay() + |
---|
| 651 | HadronMassT2/(z * string->LightConeDecay())); |
---|
[819] | 652 | |
---|
[962] | 653 | G4LorentzVector * a4Momentum= new G4LorentzVector(HadronPt,HadronE); |
---|
[819] | 654 | |
---|
[962] | 655 | //G4cout<<"Hadron Pt"<<HadronPt<<G4endl; |
---|
| 656 | //G4cout<<"Out of SplitEandP Pz E "<<HadronPt.getZ()<<" "<<HadronE<<G4endl; |
---|
[819] | 657 | |
---|
[962] | 658 | return a4Momentum; |
---|
[819] | 659 | } |
---|
| 660 | |
---|
[962] | 661 | //----------------------------------------------------------------------------------------- |
---|
| 662 | G4double G4LundStringFragmentation::GetLightConeZ(G4double zmin, G4double zmax, |
---|
| 663 | G4int PDGEncodingOfDecayParton, |
---|
| 664 | G4ParticleDefinition* pHadron, |
---|
| 665 | G4double Px, G4double Py) |
---|
[819] | 666 | { |
---|
[962] | 667 | G4double alund; |
---|
[819] | 668 | |
---|
[962] | 669 | // If blund get restored, you MUST adapt the calculation of zOfMaxyf. |
---|
| 670 | // const G4double blund = 1; |
---|
| 671 | |
---|
| 672 | G4double z, yf; |
---|
| 673 | G4double Mass = pHadron->GetPDGMass(); |
---|
| 674 | // G4int HadronEncoding=pHadron->GetPDGEncoding(); |
---|
| 675 | |
---|
| 676 | G4double Mt2 = Px*Px + Py*Py + Mass*Mass; |
---|
| 677 | |
---|
| 678 | if(std::abs(PDGEncodingOfDecayParton) < 1000) |
---|
| 679 | { |
---|
| 680 | // ---------------- Quark fragmentation ---------------------- |
---|
| 681 | alund=0.35/GeV/GeV; // Instead of 0.7 because kinks are not considered |
---|
| 682 | G4double zOfMaxyf=alund*Mt2/(alund*Mt2 + 1.); |
---|
| 683 | G4double maxYf=(1-zOfMaxyf)/zOfMaxyf * std::exp(-alund*Mt2/zOfMaxyf); |
---|
| 684 | |
---|
| 685 | do |
---|
| 686 | { |
---|
| 687 | z = zmin + G4UniformRand()*(zmax-zmin); |
---|
| 688 | // yf = std::pow(1. - z, blund)/z*std::exp(-alund*Mt2/z); |
---|
| 689 | yf = (1-z)/z * std::exp(-alund*Mt2/z); |
---|
| 690 | } |
---|
| 691 | while (G4UniformRand()*maxYf > yf); |
---|
| 692 | } |
---|
| 693 | else |
---|
| 694 | { |
---|
| 695 | // ---------------- Di-quark fragmentation ---------------------- |
---|
| 696 | //G4cout<<"Di-quark"<<G4endl; // Vova |
---|
| 697 | alund=0.7/GeV/GeV; // 0.7 2.0 |
---|
| 698 | G4double zOfMaxyf=alund*Mt2/(alund*Mt2 + 1.); |
---|
| 699 | G4double maxYf=(1-zOfMaxyf)/zOfMaxyf * std::exp(-alund*Mt2/zOfMaxyf); |
---|
| 700 | do |
---|
| 701 | { |
---|
| 702 | z = zmin + G4UniformRand()*(zmax-zmin); |
---|
| 703 | // yf = std::pow(1. - z, blund)/z*std::exp(-alund*Mt2/z); |
---|
| 704 | yf = (1-z)/z * std::exp(-alund*Mt2/z); |
---|
| 705 | } |
---|
| 706 | while (G4UniformRand()*maxYf > yf); |
---|
| 707 | }; |
---|
| 708 | |
---|
| 709 | //G4cout<<" test z "<<std::pow(2.,3.)<<" "<<z<<G4endl; |
---|
| 710 | return z; |
---|
| 711 | } |
---|