[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: G4QParton.cc,v 1.9 2009/07/17 16:54:57 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 | // ---------------- G4QParton ---------------- |
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| 34 | // by Mikhail Kossov, Oct 2006. |
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| 35 | // class for Parton (inside a string) used by Parton String Models |
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| 36 | // For comparison mirror member functions are taken from G4 class: |
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| 37 | // G4Parton |
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[1055] | 38 | // ------------------------------------------------------------------------ |
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| 39 | // Short description: The Quark-Gluon String consists of the partons, which |
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| 40 | // are quarks and some times gluons. |
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| 41 | // ------------------------------------------------------------------------ |
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[1196] | 42 | |
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| 43 | //#define debug |
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| 44 | |
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[819] | 45 | #include "G4QParton.hh" |
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| 46 | |
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[1196] | 47 | G4QParton::G4QParton() // By default creates only quarks (not di-quarks) |
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[819] | 48 | { |
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[1196] | 49 | // CHIPS is working only with u, d, and s quarks (SU(3)xSU(3)) (no gluons! M.K.) |
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| 50 | // Random Flavor/Colour/Spin definition for default constructor (with .3 s-suppresion) |
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| 51 | PGGCode=(G4int)(2.3*G4UniformRand())+1; //@@ Additional parameter of s/u (M.K.) |
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| 52 | theType=1; |
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| 53 | #ifdef debug |
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| 54 | G4cout<<"....G4QParton::DefConstructer: PDG = "<<PGGCode<<", Type="<<theType<<G4endl; |
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| 55 | #endif |
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| 56 | // random colour (1,2,3)=(R,G,B) for quarks and (-1,-2,-3)=(aR,aG,aB) for anti-quarks |
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| 57 | theColour = (G4int)(3*G4UniformRand())+1; |
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| 58 | if(theColour>3) theColour = 3; // Should never happend |
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| 59 | theSpinZ = (G4int)(2*G4UniformRand()) - 0.5; |
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| 60 | QCont = G4QContent(0,0,0,0,0,0); |
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| 61 | // Default definition (initialization) |
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| 62 | theX = 0.; |
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| 63 | thePosition=G4ThreeVector(0.,0.,0.); |
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| 64 | theMomentum=G4LorentzVector(0.,0.,0.,0.); |
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[819] | 65 | } |
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| 66 | |
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[1196] | 67 | G4QParton::G4QParton(G4int PDG) |
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| 68 | { |
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| 69 | SetPDGCode(PDG); |
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| 70 | // Default definition (initialization) |
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| 71 | theX = 0.; |
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| 72 | thePosition=G4ThreeVector(0.,0.,0.); |
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| 73 | theMomentum=G4LorentzVector(0.,0.,0.,0.); |
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| 74 | } |
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| 75 | |
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[819] | 76 | G4QParton::G4QParton(const G4QParton &right) |
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| 77 | { |
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[1196] | 78 | PGGCode = right.PGGCode; |
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| 79 | QCont = right.QCont; |
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| 80 | theType = right.theType; |
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[819] | 81 | theMomentum = right.theMomentum; |
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| 82 | thePosition = right.thePosition; |
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[1196] | 83 | theX = right.theX; |
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| 84 | theColour = right.theColour; |
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| 85 | theSpinZ = right.theSpinZ; |
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| 86 | #ifdef debug |
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| 87 | G4cout<<"G4QParton::RCopyConstructer: PDG="<<PGGCode<<", Col="<<theColour<<", Sz=" |
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| 88 | <<theSpinZ<<G4endl; |
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| 89 | #endif |
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[819] | 90 | } |
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| 91 | |
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| 92 | G4QParton::G4QParton(const G4QParton* right) |
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| 93 | { |
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[1196] | 94 | PGGCode = right->PGGCode; |
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| 95 | QCont = right->QCont; |
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| 96 | theType = right->theType; |
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[819] | 97 | theMomentum = right->theMomentum; |
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| 98 | thePosition = right->thePosition; |
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| 99 | theX = right->theX; |
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| 100 | theColour = right->theColour; |
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| 101 | theSpinZ = right->theSpinZ; |
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[1196] | 102 | #ifdef debug |
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| 103 | G4cout<<"G4QParton::PCopyConstructer: PDG="<<PGGCode<<", Col="<<theColour<<", Sz=" |
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| 104 | <<theSpinZ<<G4endl; |
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| 105 | #endif |
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[819] | 106 | } |
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| 107 | |
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| 108 | const G4QParton& G4QParton::operator=(const G4QParton &right) |
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| 109 | { |
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| 110 | if(this != &right) // Beware of self assignment |
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| 111 | { |
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[1196] | 112 | PGGCode = right.GetPDGCode(); |
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| 113 | QCont = right.QCont; |
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| 114 | theType = right.GetType(); |
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| 115 | theMomentum = right.Get4Momentum(); |
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| 116 | thePosition = right.GetPosition(); |
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| 117 | theX = right.theX; |
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| 118 | theColour = right.theColour; |
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| 119 | theSpinZ = right.theSpinZ; |
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| 120 | #ifdef debug |
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| 121 | G4cout<<"G4QParton::=Constructer: PDG="<<PGGCode<<", Col="<<theColour<<", Sz=" |
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| 122 | <<theSpinZ<<G4endl; |
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| 123 | #endif |
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[819] | 124 | } |
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| 125 | return *this; |
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| 126 | } |
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| 127 | |
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[1196] | 128 | G4QParton::~G4QParton() {} |
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| 129 | |
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| 130 | // Redefine the parton nature without changing x, 4Mom, Pos etc. |
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| 131 | void G4QParton::SetPDGCode(G4int PDG) |
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[819] | 132 | { |
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[1196] | 133 | PGGCode=PDG; |
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| 134 | G4int aPDG=std::abs(PDG); |
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| 135 | if(aPDG < 3304 && aPDG > 1100 && aPDG%100 < 4) // di-quark |
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| 136 | { |
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| 137 | theType=2; |
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| 138 | G4int cPDG=aPDG/100; |
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| 139 | if(PDG>0) |
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| 140 | { |
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| 141 | if (cPDG==11) QCont=G4QContent(2,0,0,0,0,0); // dd |
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| 142 | else if(cPDG==21) QCont=G4QContent(1,1,0,0,0,0); // ud |
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| 143 | else if(cPDG==22) QCont=G4QContent(0,2,0,0,0,0); // uu |
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| 144 | else if(cPDG==31) QCont=G4QContent(1,0,1,0,0,0); // sd |
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| 145 | else if(cPDG==32) QCont=G4QContent(0,1,1,0,0,0); // su |
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| 146 | else if(cPDG==33) QCont=G4QContent(0,0,2,0,0,0); // ss |
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| 147 | else |
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| 148 | { |
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| 149 | G4cerr<<"***G4QParton::SetPDGCode: bad di-quark PDG="<<PDG<<G4endl; |
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| 150 | G4Exception("G4QParton::SetPDGCode:","72",FatalException,"Not SU(3) DiQuark"); |
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| 151 | } |
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| 152 | } |
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| 153 | else |
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| 154 | { |
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| 155 | if (cPDG==11) QCont=G4QContent(0,0,0,2,0,0); // anti-dd |
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| 156 | else if(cPDG==21) QCont=G4QContent(0,0,0,1,1,0); // anti-ud |
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| 157 | else if(cPDG==22) QCont=G4QContent(0,0,0,0,2,0); // anti-uu |
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| 158 | else if(cPDG==31) QCont=G4QContent(0,0,0,1,0,1); // anti-sd |
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| 159 | else if(cPDG==32) QCont=G4QContent(0,0,0,0,1,1); // anti-su |
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| 160 | else if(cPDG==33) QCont=G4QContent(0,0,0,0,0,2); // anti-ss |
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| 161 | else |
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| 162 | { |
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| 163 | G4cerr<<"***G4QParton::SetPDGCode: bad anti-di-quark PDG="<<PDG<<G4endl; |
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| 164 | G4Exception("G4QParton::SetPDGCode:","72",FatalException,"Not SU(3) AntiDiQuark"); |
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| 165 | } |
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| 166 | } |
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| 167 | } |
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| 168 | else if(aPDG && aPDG<4) // quark |
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| 169 | { |
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| 170 | theType=1; |
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| 171 | if(PDG>0) |
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| 172 | { |
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| 173 | if (PDG==1) QCont=G4QContent(1,0,0,0,0,0); // d |
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| 174 | else if(PDG==2) QCont=G4QContent(0,1,0,0,0,0); // u |
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| 175 | else if(PDG==3) QCont=G4QContent(0,0,1,0,0,0); // s |
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| 176 | else |
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| 177 | { |
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| 178 | G4cerr<<"***G4QParton::SetPDGCode: bad quark PDG="<<PDG<<G4endl; |
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| 179 | G4Exception("G4QParton::SetPDGCode:","72",FatalException,"Not SU(3) Quark"); |
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| 180 | } |
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| 181 | } |
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| 182 | else |
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| 183 | { |
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| 184 | if (PDG==-1) QCont=G4QContent(0,0,0,1,0,0); // anti-d |
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| 185 | else if(PDG==-2) QCont=G4QContent(0,0,0,0,1,0); // anti-u |
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| 186 | else if(PDG==-3) QCont=G4QContent(0,0,0,0,0,1); // anti-s |
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| 187 | else |
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| 188 | { |
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| 189 | G4cerr<<"***G4QParton::SetPDGCode: bad anti-quark PDG="<<PDG<<G4endl; |
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| 190 | G4Exception("G4QParton::SetPDGCode:","72",FatalException,"Not SU(3) Anti-Quark"); |
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| 191 | } |
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| 192 | } |
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| 193 | } |
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| 194 | else if(aPDG==9 || aPDG==21) // gluon |
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| 195 | { |
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| 196 | theType=0; |
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| 197 | QCont=G4QContent(0,0,0,0,0,0); |
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| 198 | } |
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| 199 | else |
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| 200 | { |
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| 201 | G4cerr<<"***G4QParton::SetPDGCode: wrong gluon/quark/diquark PDG="<<PDG<<G4endl; |
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| 202 | G4Exception("G4QParton::SetPDGCode:","72",FatalException,"WrongPartonPDG"); |
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| 203 | } |
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| 204 | #ifdef debug |
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| 205 | G4cout<<"....G4QParton::SetPDGCode: PDG = "<<PDG<<", Type="<<theType<<G4endl; |
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| 206 | #endif |
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| 207 | // |
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| 208 | // colour by random in (1,2,3)=(R,G,B) for quarks and |
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| 209 | // in (-1,-2,-3)=(Rbar,Gbar,Bbar) for anti-quarks: |
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| 210 | G4int RGB=(G4int)(3*G4UniformRand())+1; |
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| 211 | if(theType==1) |
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| 212 | { |
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| 213 | if(PDG>0) theColour = RGB; |
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| 214 | else theColour =-RGB; |
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| 215 | } |
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| 216 | // colour by random in (-1,-2,-3)=(Rbar,Gbar,Bbar)=(GB,RB,RG) for di-quarks and |
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| 217 | // in (1,2,3)=(R,G,B)=(GB,RB,RG) for anti-di-quarks: |
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| 218 | else if(theType==2) |
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| 219 | { |
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| 220 | if(PDG>0) theColour =-RGB; |
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| 221 | else theColour = RGB; |
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| 222 | } |
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| 223 | // ColourByRandom (-11,-12,-13,-21,...,-33)=(RRbar,RGbar,RBbar,...,BBbar) for gluons |
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| 224 | else theColour = -(RGB*10 + (G4int)(3*G4UniformRand())+1); |
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| 225 | // |
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| 226 | // spin-z choosen at random from PDG-encoded spin: |
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| 227 | // |
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| 228 | G4double dPDGSpin=1.; // Quark 2S |
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| 229 | if (theType==0) dPDGSpin=2.; // Gluon 2S |
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| 230 | else if(theType==2) dPDGSpin=aPDG%10-1; // Di-quark 2S |
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| 231 | theSpinZ = (G4int)((dPDGSpin+1)*G4UniformRand())-dPDGSpin/2; |
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[819] | 232 | } |
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| 233 | |
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[1196] | 234 | // QGS x+/x- logic of the Energy and Pz calculation |
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[819] | 235 | void G4QParton::DefineMomentumInZ(G4double aLightConeMomentum, G4bool aDirection) |
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| 236 | { |
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[1055] | 237 | G4LorentzVector a4Momentum = Get4Momentum(); |
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| 238 | aLightConeMomentum*=theX; |
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[1196] | 239 | G4double TransverseMass2 = sqr(a4Momentum.px()) + sqr(a4Momentum.py()); |
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[1055] | 240 | a4Momentum.setPz(0.5*(aLightConeMomentum - TransverseMass2/aLightConeMomentum) * |
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| 241 | (aDirection? 1: -1)); |
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| 242 | a4Momentum.setE( 0.5*(aLightConeMomentum + TransverseMass2/aLightConeMomentum)); |
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| 243 | Set4Momentum(a4Momentum); |
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[819] | 244 | } |
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[1196] | 245 | |
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| 246 | // Reduce DiQ-aDiQ to Q-aQ (true if succeeded). General function of the QPartons operations |
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| 247 | G4bool G4QParton::ReduceDiQADiQ(G4QParton* d1, G4QParton* d2) |
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| 248 | { |
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| 249 | G4bool result=false; |
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| 250 | G4int sPDG=d1->GetPDGCode(); |
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| 251 | G4int nPDG=d2->GetPDGCode(); |
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| 252 | #ifdef debug |
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| 253 | G4cout<<"G4QParton::ReduceDiQADiQ: **Called** LPDG="<<sPDG<<", RPDG="<<nPDG<<G4endl; |
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| 254 | #endif |
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| 255 | G4int qPDG=sPDG; |
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| 256 | if(qPDG<-99) qPDG=(-qPDG)/100; |
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| 257 | else qPDG/=100; |
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| 258 | G4int dPDG=nPDG; |
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| 259 | if(dPDG<-99) dPDG=(-dPDG)/100; |
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| 260 | else dPDG/=100; |
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| 261 | G4int L1=qPDG/10; |
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| 262 | G4int L2=qPDG%10; |
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| 263 | G4int R1=dPDG/10; |
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| 264 | G4int R2=dPDG%10; |
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| 265 | if(L1==R1 || L1==R2 || L2==R1 || L2==R2) // Annihilation condition |
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| 266 | { |
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| 267 | if (L1==R1) |
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| 268 | { |
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| 269 | if(sPDG>0) sPDG=L2; |
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| 270 | else sPDG=-L2; |
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| 271 | if(nPDG>0) nPDG=R2; |
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| 272 | else nPDG=-R2; |
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| 273 | #ifdef debug |
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| 274 | G4cout<<"G4QParton::ReDiQADiQ:L2="<<L2<<",R2="<<R2<<",L="<<sPDG<<",R="<<nPDG<<G4endl; |
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| 275 | #endif |
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| 276 | } |
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| 277 | else if(L1==R2) |
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| 278 | { |
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| 279 | if(sPDG>0) sPDG=L2; |
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| 280 | else sPDG=-L2; |
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| 281 | if(nPDG>0) nPDG=R1; |
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| 282 | else nPDG=-R1; |
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| 283 | #ifdef debug |
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| 284 | G4cout<<"G4QParton::ReDiQADiQ:L2="<<L2<<",R1="<<R1<<",L="<<sPDG<<",R="<<nPDG<<G4endl; |
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| 285 | #endif |
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| 286 | } |
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| 287 | else if(L2==R1) |
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| 288 | { |
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| 289 | if(sPDG>0) sPDG=L1; |
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| 290 | else sPDG=-L1; |
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| 291 | if(nPDG>0) nPDG=R2; |
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| 292 | else nPDG=-R2; |
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| 293 | #ifdef debug |
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| 294 | G4cout<<"G4QParton::ReDiQADiQ:L1="<<L1<<",R2="<<R2<<",L="<<sPDG<<",R="<<nPDG<<G4endl; |
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| 295 | #endif |
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| 296 | } |
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| 297 | else //(L2==R2) |
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| 298 | { |
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| 299 | if(sPDG>0) sPDG=L1; |
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| 300 | else sPDG=-L1; |
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| 301 | if(nPDG>0) nPDG=R1; |
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| 302 | else nPDG=-R1; |
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| 303 | #ifdef debug |
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| 304 | G4cout<<"G4QParton::ReDiQADiQ:L1="<<L1<<",R1="<<R1<<",L="<<sPDG<<",R="<<nPDG<<G4endl; |
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| 305 | #endif |
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| 306 | } |
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| 307 | d1->SetPDGCode(sPDG); // Reset the left quark |
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| 308 | d2->SetPDGCode(nPDG); // Reset the right quark |
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| 309 | result=true; |
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| 310 | #ifdef debug |
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| 311 | G4cout<<"G4QParton::ReduceDiQADiQ:AfterReduction,L="<<sPDG<<",R="<<nPDG<<G4endl; |
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| 312 | #endif |
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| 313 | } |
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| 314 | #ifdef debug |
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| 315 | else G4cout<<"-Warning-G4QParton::ReduceDiQADiQ:DQ-aDQ reduction to Q-aQ Failed"<<G4endl; |
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| 316 | #endif |
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| 317 | return result; |
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| 318 | } |
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