[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: G4QString.cc,v 1.17 2009/09/04 14:38:00 mkossov Exp $ |
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[1340] | 28 | // GEANT4 tag $Name: hadr-chips-V09-03-08 $ |
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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 | // ---------------- G4QString ---------------- |
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| 34 | // by Mikhail Kossov Oct, 2006 |
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| 35 | // class for excited string used by Parton String Models |
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| 36 | // For comparison mirror member functions are taken from G4 classes: |
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| 37 | // G4FragmentingString |
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| 38 | // G4ExcitedStringDecay |
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[1055] | 39 | // --------------------------------------------------------------------- |
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| 40 | // Short description: If partons from the G4QPartonPair are close in |
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| 41 | // rapidity, they create Quasmons, but if they are far in the rapidity |
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| 42 | // space, they can not interact directly. Say the bottom parton (quark) |
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| 43 | // has rapidity 0, and the top parton (antiquark) has rapidity 8, then |
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| 44 | // the top quark splits in two by radiating gluon, and each part has |
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| 45 | // rapidity 4, then the gluon splits in quark-antiquark pair (rapidity |
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| 46 | // 2 each), and then the quark gadiates anothe gluon and reachs rapidity |
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| 47 | // 1. Now it can interact with the bottom antiquark, creating a Quasmon |
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| 48 | // or a hadron. The intermediate partons is the string ladder. |
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| 49 | // --------------------------------------------------------------------- |
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[819] | 50 | |
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| 51 | //#define debug |
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[1196] | 52 | //#define pdebug |
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| 53 | //#define edebug |
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[819] | 54 | |
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| 55 | #include "G4QString.hh" |
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| 56 | #include <algorithm> |
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| 57 | // Static parameters definition |
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| 58 | G4double G4QString::MassCut=350.*MeV; // minimum mass cut for the string |
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| 59 | G4double G4QString::SigmaQT=0.5*GeV; // quarkTransverseMomentum distribution parameter |
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| 60 | G4double G4QString::DiquarkSuppress=0.1; // is Diquark suppression parameter |
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| 61 | G4double G4QString::DiquarkBreakProb=0.1; // is Diquark breaking probability |
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| 62 | G4double G4QString::SmoothParam=0.9; // QGS model parameter |
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| 63 | G4double G4QString::StrangeSuppress=0.435;// Strangeness suppression (u:d:s=1:1:0.3 ?M.K.) |
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| 64 | G4double G4QString::widthOfPtSquare=-0.72*GeV*GeV; // pt -width2 forStringExcitation |
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| 65 | |
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[1196] | 66 | G4QString::G4QString() : theDirection(0), thePosition(G4ThreeVector(0.,0.,0.)) {} |
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[819] | 67 | |
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[1196] | 68 | G4QString::G4QString(G4QParton* Color, G4QParton* AntiColor, G4int Direction) |
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[819] | 69 | { |
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[1196] | 70 | #ifdef debug |
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| 71 | G4cout<<"G4QString::PPD-Constructor: Direction="<<Direction<<G4endl; |
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| 72 | #endif |
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[819] | 73 | ExciteString(Color, AntiColor, Direction); |
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[1196] | 74 | #ifdef debug |
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| 75 | G4cout<<"G4QString::PPD-Constructor: >>> String is excited"<<G4endl; |
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| 76 | #endif |
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[819] | 77 | } |
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| 78 | |
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[1196] | 79 | G4QString::G4QString(G4QPartonPair* CAC) |
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| 80 | { |
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| 81 | #ifdef debug |
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| 82 | G4cout<<"G4QString::PartonPair-Constructor: Is CALLED"<<G4endl; |
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| 83 | #endif |
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| 84 | ExciteString(CAC->GetParton1(), CAC->GetParton2(), CAC->GetDirection()); |
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| 85 | #ifdef debug |
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| 86 | G4cout<<"G4QString::PartonPair-Constructor: >>> String is excited"<<G4endl; |
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| 87 | #endif |
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| 88 | } |
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| 89 | |
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[819] | 90 | G4QString::G4QString(G4QParton* QCol,G4QParton* Gluon,G4QParton* QAntiCol,G4int Direction): |
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[1196] | 91 | theDirection(Direction), thePosition(QCol->GetPosition()) |
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[819] | 92 | { |
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| 93 | thePartons.push_back(QCol); |
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[1196] | 94 | G4LorentzVector sum=QCol->Get4Momentum(); |
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[819] | 95 | thePartons.push_back(Gluon); |
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[1196] | 96 | sum+=Gluon->Get4Momentum(); |
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[819] | 97 | thePartons.push_back(QAntiCol); |
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[1196] | 98 | sum+=QAntiCol->Get4Momentum(); |
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| 99 | Pplus =sum.e() + sum.pz(); |
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| 100 | Pminus=sum.e() - sum.pz(); |
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| 101 | decaying=None; |
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[819] | 102 | } |
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| 103 | |
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| 104 | G4QString::G4QString(const G4QString &right) : theDirection(right.GetDirection()), |
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[1196] | 105 | thePosition(right.GetPosition()) |
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| 106 | { |
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| 107 | //LeftParton=right.LeftParton; |
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| 108 | //RightParton=right.RightParton; |
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| 109 | Ptleft=right.Ptleft; |
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| 110 | Ptright=right.Ptright; |
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| 111 | Pplus=right.Pplus; |
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| 112 | Pminus=right.Pminus; |
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| 113 | decaying=right.decaying; |
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| 114 | } |
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[819] | 115 | |
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| 116 | G4QString::~G4QString() |
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[1196] | 117 | {if(thePartons.size()) std::for_each(thePartons.begin(),thePartons.end(),DeleteQParton());} |
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[819] | 118 | |
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| 119 | G4LorentzVector G4QString::Get4Momentum() const |
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| 120 | { |
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[1055] | 121 | G4LorentzVector momentum(0.,0.,0.,0.); |
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| 122 | for(unsigned i=0; i<thePartons.size(); i++) momentum += thePartons[i]->Get4Momentum(); |
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| 123 | return momentum; |
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[819] | 124 | } |
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| 125 | |
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| 126 | void G4QString::LorentzRotate(const G4LorentzRotation & rotation) |
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| 127 | { |
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[1055] | 128 | for(unsigned i=0; i<thePartons.size(); i++) |
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| 129 | thePartons[i]->Set4Momentum(rotation*thePartons[i]->Get4Momentum()); |
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[819] | 130 | } |
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| 131 | |
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[1196] | 132 | //void G4QString::InsertParton(G4QParton* aParton, const G4QParton* addafter) |
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| 133 | //{ |
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| 134 | // G4QPartonVector::iterator insert_index; // Begin by default (? M.K.) |
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| 135 | // if(addafter != NULL) |
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| 136 | // { |
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| 137 | // insert_index=std::find(thePartons.begin(), thePartons.end(), addafter); |
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| 138 | // if (insert_index == thePartons.end()) // No object addafter in thePartons |
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| 139 | // { |
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| 140 | // G4cerr<<"***G4QString::InsertParton: Addressed Parton is not found"<<G4endl; |
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| 141 | // G4Exception("G4QString::InsertParton:","72",FatalException,"NoAddressParton"); |
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| 142 | // } |
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| 143 | // } |
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| 144 | // thePartons.insert(insert_index+1, aParton); |
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| 145 | //} |
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[819] | 146 | |
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| 147 | void G4QString::Boost(G4ThreeVector& Velocity) |
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| 148 | { |
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| 149 | for(unsigned cParton=0; cParton<thePartons.size(); cParton++) |
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| 150 | { |
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| 151 | G4LorentzVector Mom = thePartons[cParton]->Get4Momentum(); |
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| 152 | Mom.boost(Velocity); |
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| 153 | thePartons[cParton]->Set4Momentum(Mom); |
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| 154 | } |
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| 155 | } |
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| 156 | |
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[1196] | 157 | //G4QParton* G4QString::GetColorParton(void) const |
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| 158 | //{ |
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| 159 | // G4QParton* start = *(thePartons.begin()); |
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| 160 | // G4QParton* end = *(thePartons.end()-1); |
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| 161 | // G4int Encoding = start->GetPDGCode(); |
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| 162 | // if (Encoding<-1000 || (Encoding < 1000 && Encoding > 0)) return start; |
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| 163 | // return end; |
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| 164 | //} |
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[819] | 165 | |
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[1196] | 166 | //G4QParton* G4QString::GetAntiColorParton(void) const |
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| 167 | //{ |
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| 168 | // G4QParton* start = *(thePartons.begin()); |
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| 169 | // G4QParton* end = *(thePartons.end()-1); |
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| 170 | // G4int Encoding = start->GetPDGCode(); |
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| 171 | // if (Encoding < -1000 || (Encoding < 1000 && Encoding > 0)) return end; |
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| 172 | // return start; |
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| 173 | //} |
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[819] | 174 | |
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| 175 | // Fill parameters |
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[1196] | 176 | void G4QString::SetParameters(G4double mCut, G4double sigQT, G4double DQSup, G4double DQBU, |
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| 177 | G4double smPar, G4double SSup, G4double SigPt) |
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[819] | 178 | {// ============================================================================= |
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| 179 | MassCut = mCut; // minimum mass cut for the string |
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| 180 | SigmaQT = sigQT; // quark transverse momentum distribution parameter |
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| 181 | DiquarkSuppress = DQSup; // is Diquark suppression parameter |
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| 182 | DiquarkBreakProb= DQBU; // is Diquark breaking probability |
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| 183 | SmoothParam = smPar; // QGS model parameter |
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| 184 | StrangeSuppress = SSup; // Strangeness suppression parameter |
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[1055] | 185 | widthOfPtSquare = -2*SigPt*SigPt; // width^2 of pt for string excitation |
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[819] | 186 | } |
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| 187 | |
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| 188 | // Pt distribution @@ one can use 1/(1+A*Pt^2)^B |
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| 189 | G4ThreeVector G4QString::GaussianPt(G4double widthSquare, G4double maxPtSquare) const |
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| 190 | { |
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[1055] | 191 | G4double pt2; do{pt2=widthSquare*std::log(G4UniformRand());} while (pt2>maxPtSquare); |
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| 192 | pt2=std::sqrt(pt2); |
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| 193 | G4double phi=G4UniformRand()*twopi; |
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| 194 | return G4ThreeVector(pt2*std::cos(phi),pt2*std::sin(phi),0.); |
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[819] | 195 | } // End of GaussianPt |
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| 196 | |
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| 197 | // Diffractively excite the string |
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[1196] | 198 | //void G4QString::DiffString(G4QHadron* hadron, G4bool isProjectile) |
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| 199 | //{ |
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| 200 | // hadron->SplitUp(); |
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| 201 | // G4QParton* start = hadron->GetNextParton(); |
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| 202 | // if( start==NULL) |
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| 203 | // { |
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| 204 | // G4cerr<<"***G4QString::DiffString: No start parton found, nothing is done"<<G4endl; |
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| 205 | // return; |
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| 206 | // } |
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| 207 | // G4QParton* end = hadron->GetNextParton(); |
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| 208 | // if( end==NULL) |
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| 209 | // { |
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| 210 | // G4cerr<<"***G4QString::DiffString: No end parton found, nothing is done"<<G4endl; |
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| 211 | // return; |
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| 212 | // } |
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| 213 | // if(isProjectile) ExciteString(end, start, 1); // 1 = Projectile |
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| 214 | // else ExciteString(start, end,-1); // -1 = Target |
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| 215 | // SetPosition(hadron->GetPosition()); |
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| 216 | // // momenta of string ends |
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| 217 | // G4double ptSquared= hadron->Get4Momentum().perp2(); |
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| 218 | // G4double hmins=hadron->Get4Momentum().minus(); |
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| 219 | // G4double hplus=hadron->Get4Momentum().plus(); |
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| 220 | // G4double transMassSquared=hplus*hmins; |
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| 221 | // G4double maxMomentum = std::sqrt(transMassSquared) - std::sqrt(ptSquared); |
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| 222 | // G4double maxAvailMomentumSquared = maxMomentum * maxMomentum; |
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| 223 | // G4ThreeVector pt=GaussianPt(widthOfPtSquare,maxAvailMomentumSquared); |
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| 224 | // G4LorentzVector Pstart(G4LorentzVector(pt,0.)); |
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| 225 | // G4LorentzVector Pend(hadron->Get4Momentum().px(), hadron->Get4Momentum().py(), 0.); |
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| 226 | // Pend-=Pstart; |
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| 227 | // G4double tm1=hmins+(Pend.perp2()-Pstart.perp2())/hplus; |
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| 228 | // G4double tm2=std::sqrt( std::max(0., tm1*tm1-4*Pend.perp2()*hmins/hplus ) ); |
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| 229 | // G4int Sign= isProjectile ? TARGET : PROJECTILE; |
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| 230 | // G4double endMinus = 0.5 * (tm1 + Sign*tm2); |
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| 231 | // G4double startMinus= hmins - endMinus; |
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| 232 | // G4double startPlus = Pstart.perp2() / startMinus; |
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| 233 | // G4double endPlus = hplus - startPlus; |
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| 234 | // Pstart.setPz(0.5*(startPlus - startMinus)); |
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| 235 | // Pstart.setE (0.5*(startPlus + startMinus)); |
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| 236 | // Pend.setPz (0.5*(endPlus - endMinus)); |
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| 237 | // Pend.setE (0.5*(endPlus + endMinus)); |
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| 238 | // start->Set4Momentum(Pstart); |
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| 239 | // end->Set4Momentum(Pend); |
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| 240 | //#ifdef debug |
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| 241 | // G4cout<<"G4QString::DiffString: StartQ="<<start->GetPDGCode()<<start->Get4Momentum()<<"(" |
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| 242 | // <<start->Get4Momentum().mag()<<"), EndQ="<<end->GetPDGCode()<<end ->Get4Momentum() |
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| 243 | // <<"("<<end->Get4Momentum().mag()<<"), sumOfEnds="<<Pstart+Pend<<", H4M(original)=" |
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| 244 | // <<hadron->Get4Momentum()<<G4endl; |
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| 245 | //#endif |
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| 246 | //} // End of DiffString (The string is excited diffractively) |
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[819] | 247 | |
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| 248 | // Excite the string by two partons |
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| 249 | void G4QString::ExciteString(G4QParton* Color, G4QParton* AntiColor, G4int Direction) |
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| 250 | { |
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[1196] | 251 | #ifdef debug |
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| 252 | G4cout<<"G4QString::ExciteString: **Called**, direction="<<Direction<<G4endl; |
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| 253 | #endif |
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| 254 | if(thePartons.size()) std::for_each(thePartons.begin(),thePartons.end(),DeleteQParton()); |
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| 255 | thePartons.clear(); |
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[1055] | 256 | theDirection = Direction; |
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[819] | 257 | thePosition = Color->GetPosition(); |
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[1196] | 258 | #ifdef debug |
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| 259 | G4cout<<"G4QString::ExciteString: ColourPosition = "<<thePosition<<", beg="<<Color->GetPDGCode() |
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| 260 | <<",end="<<AntiColor->GetPDGCode()<<G4endl; |
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| 261 | #endif |
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[819] | 262 | thePartons.push_back(Color); |
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[1196] | 263 | G4LorentzVector sum=Color->Get4Momentum(); |
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| 264 | thePartons.push_back(AntiColor); // @@ Complain of Valgrind |
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| 265 | sum+=AntiColor->Get4Momentum(); |
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| 266 | Pplus =sum.e() + sum.pz(); |
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| 267 | Pminus=sum.e() - sum.pz(); |
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| 268 | decaying=None; |
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| 269 | #ifdef debug |
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| 270 | G4cout<<"G4QString::ExciteString: ***Done***, beg="<<(*thePartons.begin())->GetPDGCode() |
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| 271 | <<",end="<<(*(thePartons.end()-1))->GetPDGCode()<<G4endl; |
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| 272 | #endif |
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[819] | 273 | } // End of ExciteString |
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| 274 | |
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| 275 | // LUND Longitudinal fragmentation |
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| 276 | G4double G4QString::GetLundLightConeZ(G4double zmin, G4double zmax, G4int , // @@ ? M.K. |
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| 277 | G4QHadron* pHadron, G4double Px, G4double Py) |
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| 278 | { |
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[1196] | 279 | static const G4double alund = 0.7/GeV/GeV; |
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| 280 | // If blund get restored, you MUST adapt the calculation of zOfMaxyf. |
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| 281 | //static const G4double blund = 1; |
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| 282 | G4double z, yf; |
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| 283 | G4double Mt2 = Px*Px + Py*Py + pHadron->GetMass2(); |
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| 284 | G4double zOfMaxyf=alund*Mt2/(alund*Mt2+1.); |
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| 285 | G4double maxYf=(1.-zOfMaxyf)/zOfMaxyf * std::exp(-alund*Mt2/zOfMaxyf); |
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| 286 | do |
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| 287 | { |
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| 288 | z = zmin + G4UniformRand()*(zmax-zmin); |
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| 289 | // yf = std::pow(1. - z, blund)/z*std::exp(-alund*Mt2/z); |
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| 290 | yf = (1-z)/z * std::exp(-alund*Mt2/z); |
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| 291 | } while (G4UniformRand()*maxYf>yf); |
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| 292 | return z; |
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[819] | 293 | } // End of GetLundLightConeZ |
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| 294 | |
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| 295 | |
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| 296 | // QGSM Longitudinal fragmentation |
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| 297 | G4double G4QString::GetQGSMLightConeZ(G4double zmin, G4double zmax, G4int PartonEncoding, |
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[1055] | 298 | G4QHadron* , G4double, G4double) // @@ M.K. |
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[819] | 299 | { |
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| 300 | static const G4double arho=0.5; |
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| 301 | static const G4double aphi=0.; |
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| 302 | static const G4double an=-0.5; |
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| 303 | static const G4double ala=-0.75; |
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| 304 | static const G4double aksi=-1.; |
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| 305 | static const G4double alft=0.5; |
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| 306 | G4double z; |
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| 307 | G4double theA(0), d2, yf; |
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| 308 | G4int absCode = std::abs(PartonEncoding); |
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| 309 | // @@ Crazy algorithm is used for simple power low... |
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| 310 | if (absCode < 10) // Quarks (@@ 9 can be a gluon) |
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| 311 | { |
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| 312 | if(absCode == 1 || absCode == 2) theA = arho; |
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| 313 | else if(absCode == 3) theA = aphi; |
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| 314 | else |
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| 315 | { |
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| 316 | G4cerr<<"***G4QString::GetQGSMLightConeZ: CHIPS is SU(3), quakCode="<<absCode<<G4endl; |
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| 317 | G4Exception("G4QString::GetQGSMLightConeZ:","72",FatalException,"WrongQuark"); |
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| 318 | } |
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[1055] | 319 | do |
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[819] | 320 | { |
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| 321 | z = zmin + G4UniformRand()*(zmax - zmin); |
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| 322 | d2 = alft - theA; |
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| 323 | yf = std::pow( 1.-z, d2); |
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| 324 | } |
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| 325 | while (G4UniformRand()>yf); |
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| 326 | } |
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| 327 | else // Di-quarks (@@ Crazy codes are not checked) |
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| 328 | { |
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| 329 | if (absCode==3101||absCode==3103||absCode==3201||absCode==3203) d2=alft-ala-ala+arho; |
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| 330 | else if(absCode==1103||absCode==2101||absCode==2203||absCode==2103) d2=alft-an-an+arho; |
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| 331 | else d2=alft-aksi-aksi+arho; |
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| 332 | do |
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| 333 | { |
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| 334 | z = zmin + G4UniformRand()*(zmax - zmin); |
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| 335 | yf = std::pow(1.-z, d2); |
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| 336 | } |
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| 337 | while (G4UniformRand()>yf); |
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| 338 | } |
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| 339 | return z; |
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| 340 | } // End of GetQGSMLightConeZ |
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| 341 | |
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[1196] | 342 | // Diffractively excite the string (QL=true - QGS Light Cone, =false - Lund Light Cone) |
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[819] | 343 | G4QHadronVector* G4QString::FragmentString(G4bool QL) |
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| 344 | { |
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| 345 | // Can no longer modify Parameters for Fragmentation. |
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[1196] | 346 | #ifdef edebug |
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| 347 | G4LorentzVector string4M=Get4Momentum(); // Just for Energy-Momentum ConservCheck |
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| 348 | #endif |
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| 349 | #ifdef debug |
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| 350 | G4cout<<"G4QString::FragmentString:-->Called,QL="<<QL<<", M="<<Get4Momentum().m()<<", L=" |
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| 351 | <<GetLeftParton()->Get4Momentum()<<",R="<<GetRightParton()->Get4Momentum()<<G4endl; |
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| 352 | #endif |
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| 353 | // check if string has enough mass to fragment. If not, convert to one or two hadrons |
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| 354 | G4QHadronVector* LeftVector = LightFragmentationTest(); |
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| 355 | if(LeftVector) |
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| 356 | { |
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| 357 | #ifdef edebug |
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| 358 | G4LorentzVector sL=string4M; |
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| 359 | for(unsigned L = 0; L < LeftVector->size(); L++) |
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| 360 | { |
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| 361 | G4QHadron* LH = (*LeftVector)[L]; |
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| 362 | G4LorentzVector L4M=LH->Get4Momentum(); |
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| 363 | sL-=L4M; |
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| 364 | G4cout<<"-EMC-G4QStr::FragStr:L#"<<L<<",PDG="<<LH->GetPDGCode()<<",4M="<<L4M<<G4endl; |
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| 365 | } |
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| 366 | G4cout<<"-EMC-G4QString::FragmentString:---LightFragmentation---> Res4M="<<sL<<G4endl; |
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| 367 | #endif |
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| 368 | return LeftVector; //@@ Just decay in 2 or 1 (?) hadron, if below theCut |
---|
| 369 | } |
---|
| 370 | #ifdef debug |
---|
| 371 | G4cout<<"G4QString::FragmentString:OUTPUT is not yet defined, define Left/Right"<<G4endl; |
---|
| 372 | #endif |
---|
| 373 | LeftVector = new G4QHadronVector; // Valgrind complain to LeftVector |
---|
[1055] | 374 | G4QHadronVector* RightVector = new G4QHadronVector; |
---|
[1196] | 375 | // Remember 4-momenta of the string ends (@@ only for the two-parton string, no gluons) |
---|
| 376 | G4LorentzVector left4M=GetLeftParton()->Get4Momentum(); // For recovery when failed |
---|
| 377 | G4LorentzVector right4M=GetRightParton()->Get4Momentum(); |
---|
| 378 | #ifdef debug |
---|
| 379 | G4cout<<"G4QString::FragmString: ***Remember*** L4M="<<left4M<<", R4M="<<right4M<<G4endl; |
---|
| 380 | #endif |
---|
| 381 | G4int leftPDG=GetLeftParton()->GetPDGCode(); |
---|
| 382 | G4int rightPDG=GetRightParton()->GetPDGCode(); |
---|
| 383 | // Transform string to CMS |
---|
| 384 | G4LorentzVector momentum=Get4Momentum(); |
---|
| 385 | G4LorentzRotation toCms(-(momentum.boostVector())); |
---|
| 386 | momentum= toCms * thePartons[0]->Get4Momentum(); |
---|
| 387 | toCms.rotateZ(-1*momentum.phi()); |
---|
| 388 | toCms.rotateY(-1*momentum.theta()); |
---|
| 389 | for(unsigned index=0; index<thePartons.size(); index++) |
---|
| 390 | { |
---|
| 391 | momentum = toCms * thePartons[index]->Get4Momentum(); // @@ reuse of the momentum |
---|
| 392 | thePartons[index]->Set4Momentum(momentum); |
---|
| 393 | } |
---|
| 394 | // Copy the string for independent attempts |
---|
| 395 | G4QParton* LeftParton = new G4QParton(GetLeftParton()); |
---|
| 396 | G4QParton* RightParton= new G4QParton(GetRightParton()); |
---|
| 397 | G4QString* theStringInCMS = new G4QString(LeftParton,RightParton,GetDirection()); |
---|
| 398 | #ifdef debug |
---|
| 399 | G4cout<<"G4QString::FragmentString: Copy with nP="<<theStringInCMS->thePartons.size() |
---|
| 400 | <<", beg="<<(*(theStringInCMS->thePartons.begin()))->GetPDGCode() |
---|
| 401 | <<", end="<<(*(theStringInCMS->thePartons.end()-1))->GetPDGCode()<<G4endl; |
---|
| 402 | #endif |
---|
[1055] | 403 | G4bool success=false; |
---|
| 404 | G4bool inner_sucess=true; |
---|
| 405 | G4int attempt=0; |
---|
[1196] | 406 | G4int StringLoopInterrupt=27; // String fragmentation LOOP limit |
---|
| 407 | #ifdef debug |
---|
| 408 | G4cout<<"G4QString::FragmentString: BeforeWhileLOOP, max = "<<StringLoopInterrupt |
---|
| 409 | <<", nP="<<thePartons.size()<<", beg="<<(*thePartons.begin())->GetPDGCode() |
---|
| 410 | <<",end="<<(*(thePartons.end()-1))->GetPDGCode()<<G4endl; |
---|
| 411 | #endif |
---|
| 412 | #ifdef edebug |
---|
| 413 | G4LorentzVector cmS4M=theStringInCMS->Get4Momentum(); |
---|
| 414 | G4cout<<"-EMC-G4QString::FragmString: c4M="<<cmS4M<<",Max="<<StringLoopInterrupt<<G4endl; |
---|
| 415 | #endif |
---|
| 416 | while (!success && attempt++ < StringLoopInterrupt) // Try fragment String till success |
---|
[1055] | 417 | { |
---|
[1196] | 418 | // Recover the CMS String |
---|
| 419 | G4QParton* LeftParton = new G4QParton(theStringInCMS->GetLeftParton()); |
---|
| 420 | G4QParton* RightParton= new G4QParton(theStringInCMS->GetRightParton()); |
---|
| 421 | ExciteString(LeftParton, RightParton, theStringInCMS->GetDirection()); |
---|
| 422 | #ifdef edebug |
---|
| 423 | G4LorentzVector cm4M=cmS4M; // Copy the full momentum for the reduction and check |
---|
| 424 | G4cout<<"-EMC-.G4QString::FragmentString: CHEK "<<cm4M<<" ?= "<<Get4Momentum()<<G4endl; |
---|
| 425 | #endif |
---|
| 426 | #ifdef debug |
---|
| 427 | G4cout<<"G4QString::FragmentString:===>LOOP, attempt = "<<attempt<<", nP=" |
---|
| 428 | <<thePartons.size()<<", beg="<<(*thePartons.begin())->GetPDGCode() |
---|
| 429 | <<",end="<<(*(thePartons.end()-1))->GetPDGCode()<<G4endl; |
---|
| 430 | #endif |
---|
| 431 | // Now clean up all hadrons in the Left and Right vectors for the new attempt |
---|
[1055] | 432 | if(LeftVector->size()) |
---|
[819] | 433 | { |
---|
| 434 | std::for_each(LeftVector->begin(), LeftVector->end(), DeleteQHadron()); |
---|
[1055] | 435 | LeftVector->clear(); |
---|
[819] | 436 | } |
---|
[1196] | 437 | //delete LeftVector; // @@ Valgrind ? |
---|
[1055] | 438 | if(RightVector->size()) |
---|
| 439 | { |
---|
[819] | 440 | std::for_each(RightVector->begin(), RightVector->end(), DeleteQHadron()); |
---|
[1055] | 441 | RightVector->clear(); |
---|
| 442 | } |
---|
[1196] | 443 | //delete RightVector; // @@ Valgrind ? |
---|
| 444 | inner_sucess=true; // set false on failure |
---|
| 445 | while (!StopFragmentation()) // LOOP with break |
---|
| 446 | { // Split current string into hadron + new string state |
---|
| 447 | #ifdef debug |
---|
| 448 | G4cout<<"G4QString::FragmentString:-->Begin LOOP/LOOP, decaying="<<decaying<<G4endl; |
---|
| 449 | #endif |
---|
| 450 | G4QHadron* Hadron=Splitup(QL); // MAIN: where the hadron is split from the string |
---|
| 451 | #ifdef edebug |
---|
| 452 | cm4M-=Hadron->Get4Momentum(); |
---|
| 453 | G4cout<<"-EMC-G4QString::FragmentString:LOOP/LOOP,d4M="<<cm4M-Get4Momentum()<<G4endl; |
---|
| 454 | #endif |
---|
| 455 | G4bool canBeFrag=IsFragmentable(); |
---|
| 456 | #ifdef debug |
---|
| 457 | G4cout<<"G4QString::FragmentString: LOOP/LOOP, canBeFrag="<<canBeFrag<<", decay=" |
---|
| 458 | <<decaying<<", H="<<Hadron<<", newStringMass="<<Get4Momentum().m()<<G4endl; |
---|
| 459 | #endif |
---|
| 460 | if(Hadron && canBeFrag) |
---|
[1055] | 461 | { |
---|
[1196] | 462 | #ifdef debug |
---|
| 463 | G4cout<<">>G4QString::FragmentString: LOOP/LOOP-NO FRAGM-, dec="<<decaying<<G4endl; |
---|
| 464 | #endif |
---|
| 465 | if(GetDecayDirection()>0) LeftVector->push_back(Hadron); |
---|
[1055] | 466 | else RightVector->push_back(Hadron); |
---|
| 467 | } |
---|
[819] | 468 | else |
---|
| 469 | { |
---|
[1196] | 470 | // @@ Try to convert to the resonance and decay, abandon if M<mGS+mPI0 |
---|
[1055] | 471 | // abandon ... start from the beginning |
---|
[1196] | 472 | #ifdef debug |
---|
| 473 | G4cout<<"G4QString::FragmentString: LOOP/LOOP, Start from scratch"<<G4endl; |
---|
| 474 | #endif |
---|
| 475 | if (Hadron) delete Hadron; |
---|
[1055] | 476 | inner_sucess=false; |
---|
| 477 | break; |
---|
| 478 | } |
---|
[1196] | 479 | #ifdef debug |
---|
| 480 | G4cout<<"G4QString::FragmentString: LOOP/LOOP End, nP=" |
---|
| 481 | <<thePartons.size()<<", beg="<<(*thePartons.begin())->GetPDGCode() |
---|
| 482 | <<",end="<<(*(thePartons.end()-1))->GetPDGCode()<<G4endl; |
---|
| 483 | #endif |
---|
[1055] | 484 | } |
---|
[1196] | 485 | #ifdef edebug |
---|
| 486 | G4LorentzVector fLR=cmS4M-Get4Momentum(); |
---|
| 487 | for(unsigned L = 0; L < LeftVector->size(); L++) |
---|
| 488 | { |
---|
| 489 | G4QHadron* LH = (*LeftVector)[L]; |
---|
| 490 | G4LorentzVector L4M=LH->Get4Momentum(); |
---|
| 491 | fLR-=L4M; |
---|
| 492 | G4cout<<"-EMC-G4QStr::FrStr:L#"<<L<<",PDG="<<LH->GetPDGCode()<<",4M="<<L4M<<G4endl; |
---|
| 493 | } |
---|
| 494 | for(unsigned R = 0; R < RightVector->size(); R++) |
---|
| 495 | { |
---|
| 496 | G4QHadron* RH = (*RightVector)[R]; |
---|
| 497 | G4LorentzVector R4M=RH->Get4Momentum(); |
---|
| 498 | fLR-=R4M; |
---|
| 499 | G4cout<<"-EMC-G4QStr::FrStr:R#"<<R<<",PDG="<<RH->GetPDGCode()<<",4M="<<R4M<<G4endl; |
---|
| 500 | } |
---|
| 501 | G4cout<<"-EMC-G4QString::FragmentString:L/R_BeforLast->r4M/M2="<<fLR<<fLR.m2()<<G4endl; |
---|
| 502 | #endif |
---|
| 503 | // Split current string into 2 final Hadrons |
---|
| 504 | #ifdef debug |
---|
| 505 | G4cout<<"G4QString::FragmentString: inner_success = "<<inner_sucess<<G4endl; |
---|
| 506 | #endif |
---|
| 507 | if(inner_sucess) |
---|
| 508 | { |
---|
| 509 | success=true; // Default prototype |
---|
| 510 | //... perform last cluster decay |
---|
| 511 | G4LorentzVector tot4M = Get4Momentum(); |
---|
| 512 | G4double totM = tot4M.m(); |
---|
| 513 | #ifdef debug |
---|
| 514 | G4cout<<"G4QString::FragmString: string4M="<<tot4M<<totM<<G4endl; |
---|
| 515 | #endif |
---|
| 516 | G4QHadron* LeftHadron; |
---|
| 517 | G4QHadron* RightHadron; |
---|
| 518 | G4QParton* RQuark = 0; |
---|
| 519 | SetLeftPartonStable(); // to query quark contents |
---|
| 520 | if(DecayIsQuark() && StableIsQuark()) // There're quarks on clusterEnds |
---|
| 521 | { |
---|
| 522 | #ifdef debug |
---|
| 523 | G4cout<<"G4QString::FragmentString: LOOP Quark Algorithm"<<G4endl; |
---|
| 524 | #endif |
---|
| 525 | LeftHadron= QuarkSplitup(GetLeftParton(), RQuark); |
---|
| 526 | } |
---|
| 527 | else |
---|
| 528 | { |
---|
| 529 | #ifdef debug |
---|
| 530 | G4cout<<"G4QString::FragmentString: LOOP Di-Quark Algorithm"<<G4endl; |
---|
| 531 | #endif |
---|
| 532 | //... there is a Diquark on cluster ends |
---|
| 533 | G4int IsParticle; |
---|
| 534 | if(StableIsQuark()) IsParticle=(GetLeftParton()->GetPDGCode()>0)?-1:1; |
---|
| 535 | else IsParticle=(GetLeftParton()->GetPDGCode()>0)?1:-1; |
---|
| 536 | G4QPartonPair QuarkPair = CreatePartonPair(IsParticle,false); // no diquarks |
---|
| 537 | RQuark = QuarkPair.GetParton2(); |
---|
| 538 | G4QParton* LQuark = QuarkPair.GetParton1(); |
---|
| 539 | LeftHadron = CreateHadron(LQuark, GetLeftParton()); // Create Left Hadron |
---|
| 540 | delete LQuark; // Delete the temporaryParton |
---|
| 541 | } |
---|
| 542 | RightHadron = CreateHadron(GetRightParton(), RQuark); // Create Right Hadron |
---|
| 543 | delete RQuark; // Delete the temporaryParton |
---|
| 544 | //... repeat procedure, if mass of cluster is too low to produce hadrons |
---|
| 545 | G4double LhM=LeftHadron->GetMass(); |
---|
| 546 | G4double RhM=RightHadron->GetMass(); |
---|
| 547 | #ifdef debug |
---|
| 548 | G4cout<<"G4QStr::FrSt:L="<<LeftHadron->GetPDGCode()<<",R="<<RightHadron->GetPDGCode() |
---|
| 549 | <<",ML="<<LhM<<",MR="<<RhM<<",SumM="<<LhM+RhM<<",tM="<<totM<<G4endl; |
---|
| 550 | #endif |
---|
| 551 | if(totM < LhM + RhM) success=false; |
---|
| 552 | //... compute hadron momenta and energies |
---|
| 553 | if(success) |
---|
| 554 | { |
---|
| 555 | G4ThreeVector Pos=GetPosition(); |
---|
| 556 | G4LorentzVector Lh4M(0.,0.,0.,LhM); |
---|
| 557 | G4LorentzVector Rh4M(0.,0.,0.,RhM); |
---|
| 558 | if(G4QHadron(tot4M).DecayIn2(Lh4M,Rh4M)) |
---|
| 559 | { |
---|
| 560 | LeftVector->push_back(new G4QHadron(LeftHadron, 0, Pos, Lh4M)); |
---|
| 561 | delete LeftHadron; |
---|
| 562 | RightVector->push_back(new G4QHadron(RightHadron, 0, Pos, Rh4M)); |
---|
| 563 | delete RightHadron; |
---|
| 564 | } |
---|
| 565 | #ifdef debug |
---|
| 566 | G4cout<<">>>G4QStr::FragString:HFilled (L) PDG="<<LeftHadron->GetPDGCode()<<", 4M=" |
---|
| 567 | <<Lh4M<<", (R) PDG="<<RightHadron->GetPDGCode()<<", 4M="<<Rh4M<<G4endl; |
---|
| 568 | #endif |
---|
| 569 | #ifdef edebug |
---|
| 570 | G4cout<<"-EMC-G4QString::FragmentString: Residual4M="<<tot4M-Lh4M-Rh4M<<G4endl; |
---|
| 571 | #endif |
---|
| 572 | } |
---|
| 573 | else |
---|
| 574 | { |
---|
| 575 | if(LeftHadron) delete LeftHadron; |
---|
| 576 | if(RightHadron) delete RightHadron; |
---|
| 577 | } |
---|
| 578 | } // End of inner success |
---|
| 579 | } // End of while |
---|
[1055] | 580 | delete theStringInCMS; |
---|
[1196] | 581 | #ifdef debug |
---|
| 582 | G4cout<<"G4QString::FragmentString: LOOP/LOOP, success="<<success<<G4endl; |
---|
| 583 | #endif |
---|
[1055] | 584 | if (!success) |
---|
| 585 | { |
---|
| 586 | if(RightVector->size()) |
---|
| 587 | { |
---|
[819] | 588 | std::for_each(RightVector->begin(), RightVector->end(), DeleteQHadron()); |
---|
[1055] | 589 | RightVector->clear(); |
---|
| 590 | } |
---|
| 591 | delete RightVector; |
---|
| 592 | if(LeftVector->size()) |
---|
[819] | 593 | { |
---|
| 594 | std::for_each(LeftVector->begin(), LeftVector->end(), DeleteQHadron()); |
---|
[1055] | 595 | LeftVector->clear(); |
---|
[819] | 596 | } |
---|
[1196] | 597 | delete LeftVector; |
---|
| 598 | #ifdef debug |
---|
| 599 | G4cout<<"G4QString::FragmString:StringNotFragm,L4M="<<left4M<<",R4M="<<right4M<<G4endl; |
---|
| 600 | #endif |
---|
| 601 | // Recover the Left/Right partons 4-moms of the String in ZLS |
---|
| 602 | GetLeftParton()->SetPDGCode(leftPDG); |
---|
| 603 | GetRightParton()->SetPDGCode(rightPDG); |
---|
| 604 | GetLeftParton()->Set4Momentum(left4M); |
---|
| 605 | GetRightParton()->Set4Momentum(right4M); |
---|
| 606 | return 0; // The string can not be fragmented |
---|
| 607 | } |
---|
| 608 | // @@@@@ Print collected Left and Right Hadrons (decay resonances!) |
---|
| 609 | #ifdef edebug |
---|
| 610 | G4LorentzVector sLR=cmS4M; |
---|
| 611 | for(unsigned L = 0; L < LeftVector->size(); L++) |
---|
| 612 | { |
---|
| 613 | G4QHadron* LH = (*LeftVector)[L]; |
---|
| 614 | G4LorentzVector L4M=LH->Get4Momentum(); |
---|
| 615 | sLR-=L4M; |
---|
| 616 | G4cout<<"-EMC-G4QStr::FragmStri:L#"<<L<<",PDG="<<LH->GetPDGCode()<<",4M="<<L4M<<G4endl; |
---|
| 617 | } |
---|
| 618 | for(unsigned R = 0; R < RightVector->size(); R++) |
---|
| 619 | { |
---|
| 620 | G4QHadron* RH = (*RightVector)[R]; |
---|
| 621 | G4LorentzVector R4M=RH->Get4Momentum(); |
---|
| 622 | sLR-=R4M; |
---|
| 623 | G4cout<<"-EMC-G4QStr::FragmStri:R#"<<R<<",PDG="<<RH->GetPDGCode()<<",4M="<<R4M<<G4endl; |
---|
| 624 | } |
---|
| 625 | G4cout<<"-EMC-G4QString::FragmentString:---L/R_BeforeMerge---> Res4M="<<sLR<<G4endl; |
---|
| 626 | #endif |
---|
[1055] | 627 | // Join Left and Right Vectors into LeftVector in correct order. |
---|
| 628 | while(!RightVector->empty()) |
---|
| 629 | { |
---|
| 630 | LeftVector->push_back(RightVector->back()); |
---|
| 631 | RightVector->erase(RightVector->end()-1); |
---|
| 632 | } |
---|
| 633 | delete RightVector; |
---|
[1196] | 634 | // @@ A trick, the real bug should be found !! |
---|
| 635 | G4QHadronVector::iterator ilv; // @@ |
---|
| 636 | for(ilv = LeftVector->begin(); ilv < LeftVector->end(); ilv++) // @@ |
---|
| 637 | { |
---|
| 638 | G4ThreeVector CV=(*ilv)->Get4Momentum().vect(); // @@ |
---|
| 639 | if(CV.x()==0. && CV.y()==0. && CV.z()==0.) LeftVector->erase(ilv); // @@ |
---|
| 640 | } |
---|
| 641 | // Calculate time and position of hadrons with @@ very rough formation time |
---|
| 642 | G4double StringMass=Get4Momentum().mag(); |
---|
| 643 | static const G4double dkappa = 2.0 * GeV/fermi; // @@ 2*kappa kappa=1 GeV/fermi (?) |
---|
| 644 | for(unsigned c1 = 0; c1 < LeftVector->size(); c1++) |
---|
| 645 | { |
---|
| 646 | G4double SumPz = 0; |
---|
| 647 | G4double SumE = 0; |
---|
| 648 | for(unsigned c2 = 0; c2 < c1; c2++) |
---|
| 649 | { |
---|
| 650 | G4LorentzVector hc2M=(*LeftVector)[c2]->Get4Momentum(); |
---|
| 651 | SumPz += hc2M.pz(); |
---|
| 652 | SumE += hc2M.e(); |
---|
| 653 | } |
---|
| 654 | G4QHadron* hc1=(*LeftVector)[c1]; |
---|
| 655 | G4LorentzVector hc1M=hc1->Get4Momentum(); |
---|
| 656 | G4double HadronE = hc1M.e(); |
---|
| 657 | G4double HadronPz= hc1M.pz(); |
---|
| 658 | hc1->SetFormationTime((StringMass-SumPz-SumPz+HadronE-HadronPz)/dkappa); |
---|
| 659 | hc1->SetPosition(G4ThreeVector(0,0,(StringMass-SumE-SumE-HadronE+HadronPz)/dkappa)); |
---|
| 660 | } |
---|
[1055] | 661 | G4LorentzRotation toObserverFrame(toCms.inverse()); |
---|
[1196] | 662 | #ifdef debug |
---|
| 663 | G4cout<<"G4QString::FragmentString: beforeLoop LVsize = "<<LeftVector->size()<<G4endl; |
---|
| 664 | #endif |
---|
[1055] | 665 | for(unsigned C1 = 0; C1 < LeftVector->size(); C1++) |
---|
| 666 | { |
---|
| 667 | G4QHadron* Hadron = (*LeftVector)[C1]; |
---|
| 668 | G4LorentzVector Momentum = Hadron->Get4Momentum(); |
---|
| 669 | Momentum = toObserverFrame*Momentum; |
---|
| 670 | Hadron->Set4Momentum(Momentum); |
---|
| 671 | G4LorentzVector Coordinate(Hadron->GetPosition(), Hadron->GetFormationTime()); |
---|
| 672 | Momentum = toObserverFrame*Coordinate; |
---|
| 673 | Hadron->SetFormationTime(Momentum.e()); |
---|
| 674 | Hadron->SetPosition(GetPosition()+Momentum.vect()); |
---|
| 675 | } |
---|
[1196] | 676 | #ifdef edebug |
---|
| 677 | G4LorentzVector sLA=string4M; |
---|
| 678 | for(unsigned L = 0; L < LeftVector->size(); L++) |
---|
| 679 | { |
---|
| 680 | G4QHadron* LH = (*LeftVector)[L]; |
---|
| 681 | G4LorentzVector L4M=LH->Get4Momentum(); |
---|
| 682 | sLA-=L4M; |
---|
| 683 | G4cout<<"-EMC-G4QStr::FragmStri:L#"<<L<<",PDG="<<LH->GetPDGCode()<<",4M="<<L4M<<G4endl; |
---|
| 684 | } |
---|
| 685 | G4cout<<"-EMC-G4QString::FragmentString:---LSAfterMerge&Conv---> Res4M="<<sLA<<G4endl; |
---|
| 686 | #endif |
---|
| 687 | #ifdef debug |
---|
| 688 | G4cout<<"G4QString::FragmentString: *** Done *** "<<G4endl; |
---|
| 689 | #endif |
---|
| 690 | return LeftVector; // Should be deleted by user (@@ Valgrind complain ?) |
---|
| 691 | } // End of FragmentString |
---|
[819] | 692 | |
---|
[1196] | 693 | // Simple decay of the string if the excitation mass is too small for HE fragmentation |
---|
| 694 | // !! If the mass is below the single hadron threshold, make warning (improve) and convert |
---|
| 695 | // the string to the single S-hadron breaking energy conservation (temporary) and improve, |
---|
| 696 | // taking the threshold into account on the level of the String creation (merge strings) !! |
---|
[819] | 697 | G4QHadronVector* G4QString::LightFragmentationTest() |
---|
| 698 | { |
---|
| 699 | // Check string decay threshold |
---|
[1196] | 700 | G4LorentzVector tot4M=Get4Momentum(); |
---|
| 701 | #ifdef debug |
---|
| 702 | G4cout<<"G4QString::LightFragmentationTest: ***Called***, string4M="<<tot4M<<G4endl; |
---|
| 703 | #endif |
---|
| 704 | G4QHadronVector* result=0; // return 0 when string exceeds the mass cut or below mh1+mh2 |
---|
[1055] | 705 | |
---|
[1196] | 706 | G4QHadronPair hadrons((G4QHadron*)0, (G4QHadron*)0); // pair of hadrons for output of FrM |
---|
| 707 | G4double fragMass = FragmentationMass(0,&hadrons); // Minimum mass to decay the string |
---|
| 708 | #ifdef debug |
---|
| 709 | G4cout<<"G4QString::LightFragTest: before check nP="<<thePartons.size()<<", MS2=" |
---|
| 710 | <<Mass2()<<", MCut="<<MassCut<<", beg="<<(*thePartons.begin())->GetPDGCode() |
---|
| 711 | <<",end="<<(*(thePartons.end()-1))->GetPDGCode()<<", fM="<<fragMass<<G4endl; |
---|
| 712 | #endif |
---|
| 713 | if(Mass2() > sqr(fragMass+MassCut))// Big enough to fragment in a lader (avoid the decay) |
---|
[1055] | 714 | { |
---|
[1196] | 715 | if(hadrons.first) delete hadrons.first; |
---|
| 716 | if(hadrons.second) delete hadrons.second; |
---|
| 717 | #ifdef debug |
---|
| 718 | G4cout<<"G4QString::LightFragTest:NO,M2="<<Mass2()<<">"<<sqr(fragMass+MassCut)<<G4endl; |
---|
| 719 | #endif |
---|
| 720 | return result; // =0. Depends on the parameter of the Mass Cut |
---|
[1055] | 721 | } |
---|
[1196] | 722 | G4double totM= tot4M.m(); |
---|
| 723 | G4QHadron* h1=hadrons.first; |
---|
| 724 | G4QHadron* h2=hadrons.second; |
---|
| 725 | if(h1 && h2) |
---|
[1055] | 726 | { |
---|
[1196] | 727 | G4double h1M = h1->GetMass(); |
---|
| 728 | G4double h2M = h2->GetMass(); |
---|
| 729 | #ifdef debug |
---|
| 730 | G4cout<<"G4QString::LightFragTest:tM="<<totM<<","<<h1M<<"+"<<h2M<<"+"<<h1M+h2M<<G4endl; |
---|
| 731 | #endif |
---|
| 732 | if(h1M + h2M <= totM) // The string can decay in these two hadrons |
---|
| 733 | { |
---|
| 734 | // Create two stable hadrons |
---|
| 735 | G4LorentzVector h4M1(0.,0.,0.,h1M); |
---|
| 736 | G4LorentzVector h4M2(0.,0.,0.,h2M); |
---|
| 737 | if(G4QHadron(tot4M).DecayIn2(h4M1,h4M2)) |
---|
| 738 | { |
---|
| 739 | result = new G4QHadronVector; |
---|
| 740 | result->push_back(new G4QHadron(hadrons.first, 0, GetPosition(), h4M1)); |
---|
| 741 | result->push_back(new G4QHadron(hadrons.second,0, GetPosition(), h4M2)); |
---|
| 742 | } |
---|
| 743 | #ifdef edebug |
---|
| 744 | G4int L=result->size(); if(L) for(G4int i=0; i<L; i++) |
---|
| 745 | { |
---|
| 746 | tot4M-=(*result)[i]->Get4Momentum(); |
---|
| 747 | G4cout<<"-EMC-G4QString::LightFragTest: i="<<i<<", residual4M="<<tot4M<<G4endl; |
---|
| 748 | } |
---|
| 749 | #endif |
---|
| 750 | } |
---|
| 751 | #ifdef debug |
---|
| 752 | else G4cout<<"-Warning-G4QString::LightFragTest: TooBigHadronMasses to decay"<<G4endl; |
---|
| 753 | #endif |
---|
[1055] | 754 | } |
---|
[1196] | 755 | #ifdef debug |
---|
| 756 | else G4cout<<"-Warning-G4QString::LightFragTest: No Hadrons have been proposed"<<G4endl; |
---|
| 757 | #endif |
---|
| 758 | delete hadrons.first; |
---|
| 759 | delete hadrons.second; |
---|
[1055] | 760 | return result; |
---|
[819] | 761 | } // End of LightFragmentationTest |
---|
| 762 | |
---|
| 763 | // Calculate Fragmentation Mass (if pdefs # 0, returns two hadrons) |
---|
[1196] | 764 | G4double G4QString::FragmentationMass(G4int HighSpin, G4QHadronPair* pdefs) |
---|
[819] | 765 | { |
---|
[1196] | 766 | G4double mass=0.; |
---|
| 767 | #ifdef debug |
---|
| 768 | G4cout<<"G4QString::FragmMass: ***Called***, s4M="<<Get4Momentum()<<G4endl; |
---|
| 769 | #endif |
---|
[819] | 770 | // Example how to use an interface to different member functions |
---|
[1196] | 771 | G4QHadron* Hadron1 = 0; |
---|
[819] | 772 | G4QHadron* Hadron2 = 0; |
---|
[1196] | 773 | #ifdef debug |
---|
| 774 | G4cout<<"G4QString::FragmentationMass: Create spin-0 or spin-1/2 hadron: nP=" |
---|
| 775 | <<thePartons.size()<<", beg="<<(*thePartons.begin())->GetPDGCode() |
---|
| 776 | <<",end="<<(*(thePartons.end()-1))->GetPDGCode()<<G4endl; |
---|
| 777 | #endif |
---|
| 778 | G4int iflc = (G4UniformRand() < 0.5) ? 1 : 2; // Create additional Q-antiQ pair @@ No S |
---|
| 779 | G4int LPDG= GetLeftParton()->GetPDGCode(); |
---|
| 780 | G4int LT = GetLeftParton()->GetType(); |
---|
| 781 | if ( (LPDG > 0 && LT == 1) || (LPDG < 0 && LT == 2) ) iflc = -iflc; // anti-quark |
---|
| 782 | G4QParton* piflc = new G4QParton( iflc); |
---|
| 783 | G4QParton* miflc = new G4QParton(-iflc); |
---|
| 784 | if(HighSpin) |
---|
[819] | 785 | { |
---|
[1196] | 786 | Hadron1 = CreateHighSpinHadron(GetLeftParton(),piflc); |
---|
| 787 | Hadron2 = CreateHighSpinHadron(GetRightParton(),miflc); |
---|
| 788 | #ifdef debug |
---|
| 789 | G4cout<<"G4QString::FragmentationMass: High, PDG1="<<Hadron1->GetPDGCode() |
---|
| 790 | <<", PDG2="<<Hadron2->GetPDGCode()<<G4endl; |
---|
| 791 | #endif |
---|
[819] | 792 | } |
---|
| 793 | else |
---|
| 794 | { |
---|
[1196] | 795 | Hadron1 = CreateLowSpinHadron(GetLeftParton(),piflc); |
---|
| 796 | Hadron2 = CreateLowSpinHadron(GetRightParton(),miflc); |
---|
| 797 | #ifdef debug |
---|
| 798 | G4cout<<"G4QString::FragmentationMass: Low, PDG1="<<Hadron1->GetPDGCode() |
---|
| 799 | <<", PDG2="<<Hadron2->GetPDGCode()<<G4endl; |
---|
| 800 | #endif |
---|
[819] | 801 | } |
---|
[1196] | 802 | mass = Hadron1->GetMass() + Hadron2->GetMass(); |
---|
| 803 | if(pdefs) // need to return hadrons as well as the mass estimate |
---|
[1055] | 804 | { |
---|
[1196] | 805 | pdefs->first = Hadron1; // To be deleted by the calling program if not zero |
---|
| 806 | pdefs->second = Hadron2; // To be deleted by the calling program if not zero |
---|
| 807 | } |
---|
| 808 | else // Forget about the hadrons |
---|
| 809 | { |
---|
| 810 | if(Hadron1) delete Hadron1; |
---|
| 811 | if(Hadron2) delete Hadron2; |
---|
| 812 | } |
---|
| 813 | delete piflc; |
---|
| 814 | delete miflc; |
---|
| 815 | #ifdef debug |
---|
| 816 | G4cout<<"G4QString::FragmentationMass: ***Done*** mass="<<mass<<G4endl; |
---|
| 817 | #endif |
---|
[819] | 818 | return mass; |
---|
| 819 | } // End of FragmentationMass |
---|
| 820 | |
---|
| 821 | void G4QString::SetLeftPartonStable() |
---|
| 822 | { |
---|
[1196] | 823 | theStableParton=GetLeftParton(); |
---|
| 824 | theDecayParton=GetRightParton(); |
---|
| 825 | decaying=Right; |
---|
[819] | 826 | } |
---|
| 827 | |
---|
| 828 | void G4QString::SetRightPartonStable() |
---|
| 829 | { |
---|
[1196] | 830 | theStableParton=GetRightParton(); |
---|
| 831 | theDecayParton=GetLeftParton(); |
---|
| 832 | decaying=Left; |
---|
[819] | 833 | } |
---|
| 834 | |
---|
| 835 | G4int G4QString::GetDecayDirection() const |
---|
| 836 | { |
---|
[1055] | 837 | if (decaying == Left ) return +1; |
---|
| 838 | else if (decaying == Right) return -1; |
---|
| 839 | else |
---|
| 840 | { |
---|
| 841 | G4cerr<<"***G4QString::GetDecayDirection: wrong DecayDirection="<<decaying<<G4endl; |
---|
[819] | 842 | G4Exception("G4QString::GetDecayDirection:","72",FatalException,"WrongDecayDirection"); |
---|
[1055] | 843 | } |
---|
| 844 | return 0; |
---|
[819] | 845 | } |
---|
| 846 | |
---|
[1196] | 847 | //G4ThreeVector G4QString::StablePt() |
---|
| 848 | //{ |
---|
| 849 | // if (decaying == Left ) return Ptright; |
---|
| 850 | // else if (decaying == Right ) return Ptleft; |
---|
| 851 | // else |
---|
| 852 | // { |
---|
| 853 | // G4cerr<<"***G4QString::StablePt: wrong DecayDirection="<<decaying<<G4endl; |
---|
| 854 | // G4Exception("G4QString::StablePt:","72",FatalException,"WrongDecayDirection"); |
---|
| 855 | // } |
---|
| 856 | // return G4ThreeVector(); |
---|
| 857 | //} |
---|
[819] | 858 | |
---|
| 859 | G4ThreeVector G4QString::DecayPt() |
---|
| 860 | { |
---|
[1055] | 861 | if (decaying == Left ) return Ptleft; |
---|
| 862 | else if (decaying == Right ) return Ptright; |
---|
| 863 | else |
---|
| 864 | { |
---|
| 865 | G4cerr<<"***G4QString::DecayPt: wrong DecayDirection="<<decaying<<G4endl; |
---|
[819] | 866 | G4Exception("G4QString::DecayPt:","72",FatalException,"WrongDecayDirection"); |
---|
[1055] | 867 | } |
---|
| 868 | return G4ThreeVector(); |
---|
[819] | 869 | } |
---|
| 870 | |
---|
| 871 | // Random choice of string end to use it for creating the hadron (decay) |
---|
| 872 | G4QHadron* G4QString::Splitup(G4bool QL) |
---|
| 873 | { |
---|
[1196] | 874 | SideOfDecay = (G4UniformRand() < 0.5) ? 1: -1; |
---|
| 875 | #ifdef debug |
---|
| 876 | G4cout<<"G4QString::Splitup:**Called**,s="<<SideOfDecay<<",s4M="<<Get4Momentum()<<G4endl; |
---|
| 877 | #endif |
---|
[819] | 878 | if(SideOfDecay<0) SetLeftPartonStable(); // Decay Right parton |
---|
| 879 | else SetRightPartonStable(); // Decay Left parton |
---|
| 880 | G4QParton* newStringEnd; |
---|
| 881 | G4QHadron* Hadron; |
---|
[1196] | 882 | if(DecayIsQuark()) Hadron= QuarkSplitup(theDecayParton, newStringEnd); // Split Quark |
---|
| 883 | else Hadron= DiQuarkSplitup(theDecayParton, newStringEnd); // Split DiQuark |
---|
| 884 | #ifdef debug |
---|
| 885 | G4cout<<"G4QString::Splitup: newStringEndPDG="<<newStringEnd->GetPDGCode()<<", nP=" |
---|
| 886 | <<thePartons.size()<<", beg="<<(*thePartons.begin())->GetPDGCode() |
---|
| 887 | <<",end="<<(*(thePartons.end()-1))->GetPDGCode()<<G4endl; |
---|
| 888 | #endif |
---|
| 889 | // create new String from the old one: keep Left and Right order, but replace decay |
---|
| 890 | G4LorentzVector* HadronMomentum=SplitEandP(Hadron, QL);//The decayed parton isn't changed |
---|
| 891 | #ifdef debug |
---|
| 892 | G4cout<<"G4QString::Splitup: HM="<<HadronMomentum<<", nP=" |
---|
| 893 | <<thePartons.size()<<", beg="<<(*thePartons.begin())->GetPDGCode() |
---|
| 894 | <<",end="<<(*(thePartons.end()-1))->GetPDGCode()<<G4endl; |
---|
| 895 | #endif |
---|
| 896 | if(HadronMomentum) // The decay succeeded, now the new 4-mon can be set to NewStringEnd |
---|
[819] | 897 | { |
---|
[1196] | 898 | #ifdef pdebug |
---|
| 899 | G4cout<<">>>>>G4QString::Splitup: HFilled 4M="<<*HadronMomentum<<",PDG=" |
---|
| 900 | <<Hadron->GetPDGCode()<<",s4M-h4M="<<Get4Momentum()-*HadronMomentum<<G4endl; |
---|
| 901 | #endif |
---|
| 902 | newStringEnd->Set4Momentum(theDecayParton->Get4Momentum()-*HadronMomentum); |
---|
[1055] | 903 | Hadron->Set4Momentum(*HadronMomentum); |
---|
[1196] | 904 | Hadron->SetPosition(GetPosition()); |
---|
| 905 | if(decaying == Left) |
---|
| 906 | { |
---|
| 907 | G4QParton* theFirst = thePartons[0]; // Substitute for the First Parton |
---|
| 908 | delete theFirst; // The OldParton instance is deleted |
---|
| 909 | thePartons[0] = newStringEnd; // Delete equivalent for newStringEnd |
---|
| 910 | #ifdef debug |
---|
| 911 | G4cout<<"G4QString::Splitup: theFirstPDG="<<theFirst->GetPDGCode()<<G4endl; |
---|
| 912 | #endif |
---|
| 913 | Ptleft -= HadronMomentum->vect(); |
---|
| 914 | Ptleft.setZ(0.); // @@ (Z is anyway ignored) M.K. (?) |
---|
| 915 | } |
---|
| 916 | else if (decaying == Right) |
---|
| 917 | { |
---|
| 918 | G4QParton* theLast = thePartons[thePartons.size()-1]; // Substitute for theLastParton |
---|
| 919 | delete theLast; // The OldParton instance is deleted |
---|
| 920 | thePartons[thePartons.size()-1] = newStringEnd; // Delete equivalent for newStringEnd |
---|
| 921 | #ifdef debug |
---|
| 922 | G4cout<<"G4QString::Splitup: theLastPDG="<<theLast->GetPDGCode()<<", nP=" |
---|
| 923 | <<thePartons.size()<<", beg="<<thePartons[0]->GetPDGCode()<<",end=" |
---|
| 924 | <<thePartons[thePartons.size()-1]->GetPDGCode()<<",P="<<theLast |
---|
| 925 | <<"="<<thePartons[thePartons.size()-1]<<G4endl; |
---|
| 926 | #endif |
---|
| 927 | Ptright -= HadronMomentum->vect(); |
---|
| 928 | Ptright.setZ(0.); // @@ (Z is anyway ignored) M.K. (?) |
---|
| 929 | } |
---|
| 930 | else |
---|
| 931 | { |
---|
| 932 | G4cerr<<"***G4QString::Splitup: wrong oldDecay="<<decaying<<G4endl; |
---|
| 933 | G4Exception("G4QString::Splitup","72",FatalException,"WrongDecayDirection"); |
---|
| 934 | } |
---|
| 935 | Pplus -= HadronMomentum->e() + HadronMomentum->pz();// Reduce Pplus ofTheString (Left) |
---|
| 936 | Pminus -= HadronMomentum->e() - HadronMomentum->pz();// Reduce Pminus ofTheString(Rite) |
---|
| 937 | #ifdef debug |
---|
| 938 | G4cout<<"G4QString::Splitup: P+="<<Pplus<<",P-="<<Pminus<<", nP=" |
---|
| 939 | <<thePartons.size()<<", beg="<<(*thePartons.begin())->GetPDGCode() |
---|
| 940 | <<",end="<<(*(thePartons.end()-1))->GetPDGCode()<<G4endl; |
---|
| 941 | G4cout<<">...>G4QString::Splitup: NewString4M="<<Get4Momentum()<<G4endl; |
---|
| 942 | #endif |
---|
[1055] | 943 | delete HadronMomentum; |
---|
[819] | 944 | } |
---|
[1196] | 945 | #ifdef debug |
---|
| 946 | G4cout<<"G4QString::Splitup: ***Done*** H4M="<<Hadron->Get4Momentum()<<", nP=" |
---|
| 947 | <<thePartons.size()<<", beg="<<(*thePartons.begin())->GetPDGCode() |
---|
| 948 | <<",end="<<(*(thePartons.end()-1))->GetPDGCode()<<G4endl; |
---|
| 949 | #endif |
---|
[819] | 950 | return Hadron; |
---|
| 951 | } // End of Splitup |
---|
| 952 | |
---|
| 953 | // QL=true for QGSM and QL=false for Lund fragmentation |
---|
| 954 | G4LorentzVector* G4QString::SplitEandP(G4QHadron* pHadron, G4bool QL) |
---|
| 955 | { |
---|
| 956 | G4double HadronMass = pHadron->GetMass(); |
---|
[1196] | 957 | #ifdef debug |
---|
| 958 | G4cout<<"G4QString::SplitEandP: ***Called*** HMass="<<HadronMass<<G4endl; |
---|
| 959 | #endif |
---|
[819] | 960 | // calculate and assign hadron transverse momentum component HadronPx andHadronPy |
---|
[1196] | 961 | G4ThreeVector HadronPt = SampleQuarkPt() + DecayPt(); // @@ SampleQuarkPt & DecayPt once |
---|
[819] | 962 | HadronPt.setZ(0.); |
---|
| 963 | //... sample z to define hadron longitudinal momentum and energy |
---|
| 964 | //... but first check the available phase space |
---|
| 965 | G4double HadronMass2T = HadronMass*HadronMass + HadronPt.mag2(); |
---|
[1196] | 966 | if (HadronMass2T >= SmoothParam*Mass2() ) return 0; // restart! |
---|
[819] | 967 | //... then compute allowed z region z_min <= z <= z_max |
---|
| 968 | G4double zMin = HadronMass2T/Mass2(); |
---|
[1196] | 969 | G4double zMax = 1.; |
---|
| 970 | #ifdef debug |
---|
| 971 | G4cout<<"G4QString::SplitEandP: zMin="<<zMin<<", zMax"<<zMax<<G4endl; |
---|
| 972 | #endif |
---|
[1055] | 973 | if (zMin >= zMax) return 0; // have to start all over! |
---|
[819] | 974 | G4double z=0; |
---|
[1196] | 975 | if(QL) z = GetQGSMLightConeZ(zMin, zMax, theDecayParton->GetPDGCode(), pHadron, |
---|
[819] | 976 | HadronPt.x(), HadronPt.y()); |
---|
[1196] | 977 | else z = GetLundLightConeZ(zMin, zMax, theDecayParton->GetPDGCode(), pHadron, |
---|
[819] | 978 | HadronPt.x(), HadronPt.y()); |
---|
| 979 | //... now compute hadron longitudinal momentum and energy |
---|
| 980 | // longitudinal hadron momentum component HadronPz |
---|
[1196] | 981 | G4double zl= z; |
---|
| 982 | if (decaying == Left ) zl*=Pplus; |
---|
| 983 | else if (decaying == Right ) zl*=Pminus; |
---|
| 984 | else // @@ Is that possible? |
---|
| 985 | { |
---|
| 986 | G4cerr<<"***G4QString::SplitEandP: wrong DecayDirection="<<decaying<<G4endl; |
---|
| 987 | G4Exception("G4QString::SplitEandP:","72",FatalException,"WrongDecayDirection"); |
---|
| 988 | } |
---|
[819] | 989 | G4double HadronE = (zl + HadronMass2T/zl)/2; |
---|
| 990 | HadronPt.setZ( GetDecayDirection() * (zl - HadronE) ); |
---|
| 991 | G4LorentzVector* a4Momentum= new G4LorentzVector(HadronPt,HadronE); |
---|
| 992 | return a4Momentum; |
---|
| 993 | } |
---|
| 994 | |
---|
| 995 | G4ThreeVector G4QString::SampleQuarkPt() |
---|
| 996 | { |
---|
| 997 | G4double Pt = SigmaQT * std::sqrt( -std::log(G4UniformRand())); |
---|
| 998 | G4double phi = twopi*G4UniformRand(); |
---|
| 999 | return G4ThreeVector(Pt * std::cos(phi),Pt * std::sin(phi),0); |
---|
| 1000 | } |
---|
| 1001 | |
---|
[1196] | 1002 | G4QHadron* G4QString::QuarkSplitup(G4QParton* decay, G4QParton* &created)// VGComplTo decay |
---|
[819] | 1003 | { |
---|
[1055] | 1004 | G4int IsParticle=(decay->GetPDGCode()>0) ? -1 : +1; // a quark needs antiquark or diquark |
---|
[819] | 1005 | G4QPartonPair QuarkPair = CreatePartonPair(IsParticle); |
---|
[1196] | 1006 | created = QuarkPair.GetParton2(); // New Parton after splitting |
---|
| 1007 | #ifdef debug |
---|
| 1008 | G4cout<<"G4QString::QuarkSplitup: ***Called*** crP="<<created->GetPDGCode()<<G4endl; |
---|
| 1009 | #endif |
---|
| 1010 | G4QParton* P1=QuarkPair.GetParton1(); |
---|
| 1011 | G4QHadron* result=CreateHadron(P1, decay); // New Hadron after splitting |
---|
| 1012 | delete P1; // Clean up the temporary parton |
---|
| 1013 | return result; |
---|
[819] | 1014 | } // End of QuarkSplitup |
---|
| 1015 | |
---|
| 1016 | // |
---|
| 1017 | G4QHadron* G4QString::DiQuarkSplitup(G4QParton* decay, G4QParton* &created) |
---|
| 1018 | { |
---|
| 1019 | //... can Diquark break or not? |
---|
| 1020 | if (G4UniformRand() < DiquarkBreakProb ) |
---|
| 1021 | { |
---|
| 1022 | //... Diquark break |
---|
| 1023 | G4int stableQuarkEncoding = decay->GetPDGCode()/1000; |
---|
| 1024 | G4int decayQuarkEncoding = (decay->GetPDGCode()/100)%10; |
---|
| 1025 | if (G4UniformRand() < 0.5) |
---|
| 1026 | { |
---|
| 1027 | G4int Swap = stableQuarkEncoding; |
---|
| 1028 | stableQuarkEncoding = decayQuarkEncoding; |
---|
| 1029 | decayQuarkEncoding = Swap; |
---|
| 1030 | } |
---|
[1196] | 1031 | G4int IsParticle=(decayQuarkEncoding>0) ? -1 : +1;// Diquark is equivalent to antiquark |
---|
[819] | 1032 | G4QPartonPair QuarkPair = CreatePartonPair(IsParticle,false); // no diquarks wanted |
---|
[1196] | 1033 | G4QParton* P2=QuarkPair.GetParton2(); |
---|
| 1034 | G4int QuarkEncoding=P2->GetPDGCode(); |
---|
| 1035 | delete P2; |
---|
[819] | 1036 | G4int i10 = std::max(std::abs(QuarkEncoding), std::abs(stableQuarkEncoding)); |
---|
| 1037 | G4int i20 = std::min(std::abs(QuarkEncoding), std::abs(stableQuarkEncoding)); |
---|
[1196] | 1038 | G4int spin = (i10 != i20 && G4UniformRand() <= 0.5) ? 1 : 3; |
---|
[819] | 1039 | G4int NewDecayEncoding = -1*IsParticle*(i10 * 1000 + i20 * 100 + spin); |
---|
[1196] | 1040 | created = new G4QParton(NewDecayEncoding); |
---|
| 1041 | #ifdef debug |
---|
| 1042 | G4cout<<"G4QString::DiQuarkSplitup: inside, crP="<<created->GetPDGCode()<<G4endl; |
---|
| 1043 | #endif |
---|
| 1044 | G4QParton* decayQuark= new G4QParton(decayQuarkEncoding); |
---|
| 1045 | G4QParton* P1=QuarkPair.GetParton1(); |
---|
| 1046 | G4QHadron* newH=CreateHadron(P1, decayQuark); |
---|
| 1047 | delete P1; |
---|
| 1048 | delete decayQuark; |
---|
| 1049 | return newH; |
---|
[819] | 1050 | } |
---|
| 1051 | else |
---|
| 1052 | { |
---|
| 1053 | //... Diquark does not break |
---|
| 1054 | G4int IsParticle=(decay->GetPDGCode()>0) ? +1 : -1; |
---|
| 1055 | G4QPartonPair QuarkPair = CreatePartonPair(IsParticle,false); // no diquarks wanted |
---|
| 1056 | created = QuarkPair.GetParton2(); |
---|
[1196] | 1057 | #ifdef debug |
---|
| 1058 | G4cout<<"G4QString::DiQuarkSplitup: diQ not break, crP="<<created->GetPDGCode()<<G4endl; |
---|
| 1059 | #endif |
---|
| 1060 | G4QParton* P1=QuarkPair.GetParton1(); |
---|
| 1061 | G4QHadron* newH=CreateHadron(P1, decay); |
---|
| 1062 | delete P1; |
---|
| 1063 | return newH; |
---|
[819] | 1064 | } |
---|
| 1065 | } // End of DiQuarkSplitup |
---|
| 1066 | |
---|
| 1067 | G4QPartonPair G4QString::CreatePartonPair(G4int NeedParticle, G4bool AllowDiquarks) |
---|
| 1068 | { |
---|
[1196] | 1069 | #ifdef debug |
---|
| 1070 | G4cout<<"G4QString::CreatePartonPair: ***Called***, P="<<NeedParticle<<", ALLOWdQ=" |
---|
| 1071 | <<AllowDiquarks<<G4endl; |
---|
| 1072 | #endif |
---|
[819] | 1073 | // NeedParticle = {+1 for Particle, -1 for AntiParticle} |
---|
| 1074 | if(AllowDiquarks && G4UniformRand() < DiquarkSuppress) |
---|
| 1075 | { |
---|
| 1076 | // Create a Diquark - AntiDiquark pair , first in pair is anti to IsParticle |
---|
| 1077 | G4int q1 = SampleQuarkFlavor(); |
---|
| 1078 | G4int q2 = SampleQuarkFlavor(); |
---|
[1196] | 1079 | G4int spin = (q1 != q2 && G4UniformRand() <= 0.5) ? 1 : 3; // @@ 0.5 M.K.? |
---|
[819] | 1080 | // Convention: quark with higher PDG number is first |
---|
| 1081 | G4int PDGcode = (std::max(q1,q2) * 1000 + std::min(q1,q2) * 100 + spin) * NeedParticle; |
---|
[1196] | 1082 | #ifdef debug |
---|
| 1083 | G4cout<<"G4QString::CreatePartonPair: Created dQ-AdQ, PDG="<<PDGcode<<G4endl; |
---|
| 1084 | #endif |
---|
| 1085 | return G4QPartonPair(new G4QParton(-PDGcode), new G4QParton(PDGcode)); |
---|
[819] | 1086 | } |
---|
| 1087 | else |
---|
| 1088 | { |
---|
[1196] | 1089 | // Create a Quark - AntiQuark pair, first in pair is a Particle |
---|
[819] | 1090 | G4int PDGcode=SampleQuarkFlavor()*NeedParticle; |
---|
[1196] | 1091 | #ifdef debug |
---|
| 1092 | G4cout<<"G4QString::CreatePartonPair: Created Q-aQ, PDG="<<PDGcode<<G4endl; |
---|
| 1093 | #endif |
---|
| 1094 | return G4QPartonPair(new G4QParton(PDGcode), new G4QParton(-PDGcode)); |
---|
[819] | 1095 | } |
---|
| 1096 | } // End of CreatePartonPair |
---|
[1196] | 1097 | |
---|
| 1098 | // Creation of the Meson out of two partons (q, anti-q) |
---|
| 1099 | G4QHadron* G4QString::CreateMeson(G4QParton* black, G4QParton* white, Spin theSpin) |
---|
| 1100 | { |
---|
| 1101 | static G4double scalarMesonMixings[6]={0.5, 0.25, 0.5, 0.25, 1.0, 0.5}; |
---|
| 1102 | static G4double vectorMesonMixings[6]={0.5, 0.0, 0.5, 0.0, 1.0, 1.0}; |
---|
| 1103 | G4int id1= black->GetPDGCode(); |
---|
| 1104 | G4int id2= white->GetPDGCode(); |
---|
| 1105 | #ifdef debug |
---|
| 1106 | G4cout<<"G4QString::CreateMeson: bT="<<black->GetType()<<"("<<id1<<"), wT=" |
---|
| 1107 | <<white->GetType()<<"("<<id2<<")"<<G4endl; |
---|
| 1108 | #endif |
---|
| 1109 | if (std::abs(id1) < std::abs(id2)) // exchange black and white |
---|
| 1110 | { |
---|
| 1111 | G4int xchg = id1; |
---|
| 1112 | id1 = id2; |
---|
| 1113 | id2 = xchg; |
---|
| 1114 | } |
---|
| 1115 | if(std::abs(id1)>3) |
---|
| 1116 | { |
---|
| 1117 | G4cerr<<"***G4QString::CreateMeson: q1="<<id1<<", q2="<<id2 |
---|
| 1118 | <<" while CHIPS is only SU(3)"<<G4endl; |
---|
| 1119 | G4Exception("G4QString::CreateMeson:","72",FatalException,"HeavyQuarkFound"); |
---|
| 1120 | } |
---|
| 1121 | G4int PDGEncoding=0; |
---|
| 1122 | if(!(id1+id2)) // annihilation case (neutral) |
---|
| 1123 | { |
---|
| 1124 | G4double rmix = G4UniformRand(); |
---|
| 1125 | G4int imix = 2*std::abs(id1) - 1; |
---|
| 1126 | if(theSpin == SpinZero) |
---|
| 1127 | PDGEncoding = 110*(1 + G4int(rmix + scalarMesonMixings[imix - 1]) |
---|
| 1128 | + G4int(rmix + scalarMesonMixings[imix] ) ) + theSpin; |
---|
| 1129 | else |
---|
| 1130 | PDGEncoding = 110*(1 + G4int(rmix + vectorMesonMixings[imix - 1]) |
---|
| 1131 | + G4int(rmix + vectorMesonMixings[imix] ) ) + theSpin; |
---|
| 1132 | } |
---|
| 1133 | else |
---|
| 1134 | { |
---|
| 1135 | PDGEncoding = 100 * std::abs(id1) + 10 * std::abs(id2) + theSpin; |
---|
| 1136 | G4bool IsUp = (std::abs(id1)&1) == 0; // quark 1 is up type quark (u or c?) |
---|
| 1137 | G4bool IsAnti = id1 < 0; // quark 1 is an antiquark? |
---|
| 1138 | if( (IsUp && IsAnti) || (!IsUp && !IsAnti) ) PDGEncoding = - PDGEncoding; |
---|
| 1139 | // Correction for the true neutral mesons |
---|
| 1140 | if( PDGEncoding == -111 || PDGEncoding == -113 || PDGEncoding == -223 || |
---|
| 1141 | PDGEncoding == -221 || PDGEncoding == -331 || PDGEncoding == -333 ) |
---|
| 1142 | PDGEncoding = - PDGEncoding; |
---|
| 1143 | } |
---|
| 1144 | G4QHadron* Meson= new G4QHadron(PDGEncoding); |
---|
| 1145 | #ifdef debug |
---|
| 1146 | G4cout<<"G4QString::CreateBaryon: Meson is created with PDG="<<PDGEncoding<<G4endl; |
---|
| 1147 | #endif |
---|
| 1148 | //delete black; // It is better to delete here and consider |
---|
| 1149 | //delete white; // the hadron creation as a delete equivalent |
---|
| 1150 | return Meson; |
---|
| 1151 | } |
---|
| 1152 | |
---|
| 1153 | // Creation of the Baryon out of two partons (q, di-q), (anti-q, anti-di-q) |
---|
| 1154 | G4QHadron* G4QString::CreateBaryon(G4QParton* black, G4QParton* white, Spin theSpin) |
---|
| 1155 | { |
---|
| 1156 | G4int id1= black->GetPDGCode(); |
---|
| 1157 | G4int id2= white->GetPDGCode(); |
---|
| 1158 | #ifdef debug |
---|
| 1159 | G4cout<<"G4QString::CreateBaryon: bT="<<black->GetType()<<"("<<id1<<"), wT=" |
---|
| 1160 | <<white->GetType()<<"("<<id2<<")"<<G4endl; |
---|
| 1161 | #endif |
---|
| 1162 | if(std::abs(id1) < std::abs(id2)) |
---|
| 1163 | { |
---|
| 1164 | G4int xchg = id1; |
---|
| 1165 | id1 = id2; |
---|
| 1166 | id2 = xchg; |
---|
| 1167 | } |
---|
| 1168 | if(std::abs(id1)<1000 || std::abs(id2)> 3) |
---|
| 1169 | { |
---|
| 1170 | G4cerr<<"***G4QString::CreateBaryon: q1="<<id1<<", q2="<<id2 |
---|
| 1171 | <<" can't create a Baryon"<<G4endl; |
---|
| 1172 | G4Exception("G4QString::CreateBaryon:","72",FatalException,"WrongQdQSequence"); |
---|
| 1173 | } |
---|
| 1174 | G4int ifl1= std::abs(id1)/1000; |
---|
| 1175 | G4int ifl2 = (std::abs(id1) - ifl1 * 1000)/100; |
---|
| 1176 | G4int diquarkSpin = std::abs(id1)%10; |
---|
| 1177 | G4int ifl3 = id2; |
---|
| 1178 | if (id1 < 0) {ifl1 = - ifl1; ifl2 = - ifl2;} |
---|
| 1179 | //... Construct baryon, distinguish Lambda and Sigma baryons. |
---|
| 1180 | G4int kfla = std::abs(ifl1); |
---|
| 1181 | G4int kflb = std::abs(ifl2); |
---|
| 1182 | G4int kflc = std::abs(ifl3); |
---|
| 1183 | G4int kfld = std::max(kfla,kflb); |
---|
| 1184 | kfld = std::max(kfld,kflc); |
---|
| 1185 | G4int kflf = std::min(kfla,kflb); |
---|
| 1186 | kflf = std::min(kflf,kflc); |
---|
| 1187 | G4int kfle = kfla + kflb + kflc - kfld - kflf; |
---|
| 1188 | //... baryon with content uuu or ddd or sss has always spin = 3/2 |
---|
| 1189 | if(kfla==kflb && kflb==kflc) theSpin=SpinThreeHalf; |
---|
| 1190 | |
---|
| 1191 | G4int kfll = 0; |
---|
| 1192 | if(theSpin == SpinHalf && kfld > kfle && kfle > kflf) |
---|
| 1193 | { |
---|
| 1194 | // Spin J=1/2 and all three quarks different |
---|
| 1195 | // Two states exist: (uds -> lambda or sigma0) |
---|
| 1196 | // - lambda: s(ud)0 s : 3122; ie. reverse the two lighter quarks |
---|
| 1197 | // - sigma0: s(ud)1 s : 3212 |
---|
| 1198 | if(diquarkSpin == 1 ) |
---|
| 1199 | { |
---|
| 1200 | if ( kfla == kfld) kfll = 1; // heaviest quark in diquark |
---|
| 1201 | else kfll = G4int(0.25 + G4UniformRand()); |
---|
| 1202 | } |
---|
| 1203 | if(diquarkSpin==3 && kfla!=kfld) kfll = G4int(0.75+G4UniformRand()); |
---|
| 1204 | } |
---|
| 1205 | G4int PDGEncoding=0; |
---|
| 1206 | if (kfll == 1) PDGEncoding = 1000 * kfld + 100 * kflf + 10 * kfle + theSpin; |
---|
| 1207 | else PDGEncoding = 1000 * kfld + 100 * kfle + 10 * kflf + theSpin; |
---|
| 1208 | if (id1 < 0) PDGEncoding = -PDGEncoding; |
---|
| 1209 | G4QHadron* Baryon= new G4QHadron(PDGEncoding); |
---|
| 1210 | #ifdef debug |
---|
| 1211 | G4cout<<"G4QString::CreateBaryon: Baryon is created with PDG="<<PDGEncoding<<G4endl; |
---|
| 1212 | #endif |
---|
| 1213 | //delete black; // It is better to delete here and consider |
---|
| 1214 | //delete white; // the hadron creation as a delete equivalent |
---|
| 1215 | return Baryon; |
---|
| 1216 | } // End of CreateBaryon |
---|
| 1217 | |
---|
| 1218 | G4QHadron* G4QString::CreateHadron(G4QParton* black, G4QParton* white) |
---|
| 1219 | { |
---|
| 1220 | //static G4double mesonLowSpin = 0.25; // probability to create scalar meson (2s+1) |
---|
| 1221 | //static G4double baryonLowSpin= 1./3.; // probability to create 1/2 baryon (2s+1) |
---|
| 1222 | static G4double mesonLowSpin = 0.5; // probability to create scalar meson (spFlip) |
---|
| 1223 | static G4double baryonLowSpin= 0.5; // probability to create 1/2 baryon (spinFlip) |
---|
| 1224 | G4int bT=black->GetType(); |
---|
| 1225 | G4int wT=white->GetType(); |
---|
| 1226 | #ifdef debug |
---|
| 1227 | G4cout<<"G4QString::CreateHadron: bT="<<bT<<"("<<black->GetPDGCode()<<"), wT="<<wT<<"(" |
---|
| 1228 | <<white->GetPDGCode()<<")"<<G4endl; |
---|
| 1229 | #endif |
---|
| 1230 | if(bT==2 || wT==2) |
---|
| 1231 | { |
---|
| 1232 | // Baryon consists of quark and at least one di-quark |
---|
| 1233 | Spin spin = (G4UniformRand() < baryonLowSpin) ? SpinHalf : SpinThreeHalf; |
---|
| 1234 | #ifdef debug |
---|
| 1235 | G4cout<<"G4QString::CreateHadron: ----> Baryon is under creation"<<G4endl; |
---|
| 1236 | #endif |
---|
| 1237 | return CreateBaryon(black, white, spin); |
---|
| 1238 | } |
---|
| 1239 | else |
---|
| 1240 | { |
---|
| 1241 | // Meson consists of quark and abnti-quark |
---|
| 1242 | Spin spin = (G4UniformRand() < mesonLowSpin) ? SpinZero : SpinOne; |
---|
| 1243 | #ifdef debug |
---|
| 1244 | G4cout<<"G4QString::CreateHadron: ----> Meson is under creation"<<G4endl; |
---|
| 1245 | #endif |
---|
| 1246 | return CreateMeson(black, white, spin); |
---|
| 1247 | } |
---|
| 1248 | } // End of Create Hadron |
---|
| 1249 | |
---|
| 1250 | // Creation of only High Spin (2,3/2) hadrons |
---|
| 1251 | G4QHadron* G4QString::CreateLowSpinHadron(G4QParton* black, G4QParton* white) |
---|
| 1252 | { |
---|
| 1253 | G4int bT=black->GetType(); |
---|
| 1254 | G4int wT=white->GetType(); |
---|
| 1255 | #ifdef debug |
---|
| 1256 | G4cout<<"G4QString::CreateLowSpinHadron: ***Called***, bT="<<bT<<"("<<black->GetPDGCode() |
---|
| 1257 | <<"), wT="<<wT<<"("<<white->GetPDGCode()<<")"<<G4endl; |
---|
| 1258 | #endif |
---|
| 1259 | if(bT == 1 && wT == 1) |
---|
| 1260 | { |
---|
| 1261 | #ifdef debug |
---|
| 1262 | G4cout<<"G4QString::CreateLowSpinHadron: ----> Meson is under creation"<<G4endl; |
---|
| 1263 | #endif |
---|
| 1264 | return CreateMeson(black, white, SpinZero); |
---|
| 1265 | } |
---|
| 1266 | else // returns a SpinThreeHalf Baryon if all quarks are the same |
---|
| 1267 | { |
---|
| 1268 | #ifdef debug |
---|
| 1269 | G4cout<<"G4QString::CreateLowSpinHadron: ----> Baryon is under creation"<<G4endl; |
---|
| 1270 | #endif |
---|
| 1271 | return CreateBaryon(black, white, SpinHalf); |
---|
| 1272 | } |
---|
| 1273 | } // End of CreateLowSpinHadron |
---|
| 1274 | |
---|
| 1275 | // Creation of only High Spin (2,3/2) hadrons |
---|
| 1276 | G4QHadron* G4QString::CreateHighSpinHadron(G4QParton* black, G4QParton* white) |
---|
| 1277 | { |
---|
| 1278 | G4int bT=black->GetType(); |
---|
| 1279 | G4int wT=white->GetType(); |
---|
| 1280 | #ifdef debug |
---|
| 1281 | G4cout<<"G4QString::CreateHighSpinHadron:***Called***, bT="<<bT<<"("<<black->GetPDGCode() |
---|
| 1282 | <<"), wT="<<wT<<"("<<white->GetPDGCode()<<")"<<G4endl; |
---|
| 1283 | #endif |
---|
| 1284 | if(bT == 1 && wT == 1) |
---|
| 1285 | { |
---|
| 1286 | #ifdef debug |
---|
| 1287 | G4cout<<"G4QString::CreateHighSpinHadron: ----> Meson is created"<<G4endl; |
---|
| 1288 | #endif |
---|
| 1289 | return CreateMeson(black,white, SpinOne); |
---|
| 1290 | } |
---|
| 1291 | else |
---|
| 1292 | { |
---|
| 1293 | #ifdef debug |
---|
| 1294 | G4cout<<"G4QString::CreateHighSpinHadron: ----> Baryon is created"<<G4endl; |
---|
| 1295 | #endif |
---|
| 1296 | return CreateBaryon(black,white,SpinThreeHalf); |
---|
| 1297 | } |
---|
| 1298 | } // End of CreateHighSpinHadron |
---|