| 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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| 27 | // $Id: G4QParton.cc,v 1.4 2009/02/23 09:49:24 mkossov Exp $ |
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| 28 | // GEANT4 tag $Name: geant4-09-03-beta-cand-01 $ |
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| 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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| 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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| 42 | #include "G4QParton.hh" |
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| 43 | |
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| 44 | G4QParton::G4QParton(G4int PDGcode) |
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| 45 | { |
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| 46 | PDGencoding=PDGcode; |
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| 47 | theX = 0; |
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| 48 | theDefinition=G4ParticleTable::GetParticleTable()->FindParticle(PDGencoding); |
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| 49 | G4int aPDG=std::abs(PDGcode); |
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| 50 | //___________quarks__ 2 possible codes for gluons _ Condition for di-quarks |
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| 51 | if(!aPDG || (aPDG>3 && PDGcode!=9 && PDGcode!=21 && |
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| 52 | (aPDG>3303||aPDG<1103||aPDG%100>3)) || theDefinition==0) |
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| 53 | { |
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| 54 | G4cerr<<"***G4QParton::Constructor: wrong quark/diquark PDG="<<PDGcode<<G4endl; |
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| 55 | G4Exception("G4QParton::Constructor:","72",FatalException,"WrongPartonPDG"); |
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| 56 | } |
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| 57 | // |
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| 58 | // colour by random in (1,2,3)=(R,G,B) for quarks and |
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| 59 | // in (-1,-2,-3)=(Rbar,Gbar,Bbar) for anti-quarks: |
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| 60 | G4int RGB=(G4int)(3*G4UniformRand())+1; |
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| 61 | G4String name=theDefinition->GetParticleType(); |
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| 62 | if(name == "quarks") |
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| 63 | { |
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| 64 | if(PDGcode>0) theColour = RGB; |
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| 65 | else theColour =-RGB; |
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| 66 | } |
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| 67 | // colour by random in (-1,-2,-3)=(Rbar,Gbar,Bbar)=(GB,RB,RG) for di-quarks and |
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| 68 | // in (1,2,3)=(R,G,B)=(GB,RB,RG) for anti-di-quarks: |
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| 69 | else if(name == "diquarks") |
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| 70 | { |
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| 71 | if(PDGcode>0) theColour =-RGB; |
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| 72 | else theColour = RGB; |
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| 73 | } |
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| 74 | // ColourByRandom (-11,-12,-13,-21,...,-33)=(RRbar,RGbar,RBbar,...,BBbar) for gluons |
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| 75 | else if(name == "gluons") theColour = -(RGB*10 + (G4int)(3*G4UniformRand())+1); |
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| 76 | else |
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| 77 | { |
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| 78 | G4cerr<<"***G4QParton::Constructor: not quark/diquark/gluon = " |
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| 79 | <<theDefinition->GetParticleType()<<G4endl; |
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| 80 | G4Exception("G4QParton::Constructor:","72",FatalException,"WrongParton"); |
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| 81 | } |
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| 82 | // isospin-z from PDG-encoded isospin-z for |
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| 83 | // quarks, anti-quarks, di-quarks, and anti-di-quarks: |
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| 84 | if(name == "quarks" || name == "diquarks") theIsoSpinZ = theDefinition->GetPDGIsospin3(); |
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| 85 | // isospin-z choosen at random from PDG-encoded isospin for gluons (should be zero): |
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| 86 | else |
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| 87 | { |
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| 88 | G4int thisPDGiIsospin=theDefinition->GetPDGiIsospin(); |
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| 89 | if (thisPDGiIsospin == 0) theIsoSpinZ = 0; |
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| 90 | //@@ ? M.K. |
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| 91 | else theIsoSpinZ=((G4int)((thisPDGiIsospin+1)*G4UniformRand())) - thisPDGiIsospin*0.5; |
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| 92 | } |
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| 93 | // |
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| 94 | // spin-z choosen at random from PDG-encoded spin: |
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| 95 | // |
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| 96 | G4int thisPDGiSpin=theDefinition->GetPDGiSpin(); |
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| 97 | if(thisPDGiSpin == 0) theSpinZ = 0; |
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| 98 | else theSpinZ = (G4int)((thisPDGiSpin+1)*G4UniformRand())-thisPDGiSpin*0.5;; |
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| 99 | } |
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| 100 | |
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| 101 | G4QParton::G4QParton(const G4QParton &right) |
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| 102 | { |
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| 103 | PDGencoding = right.PDGencoding; |
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| 104 | theMomentum = right.theMomentum; |
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| 105 | thePosition = right.thePosition; |
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| 106 | theX = right.theX; |
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| 107 | theDefinition = right.theDefinition; |
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| 108 | theColour = right.theColour; |
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| 109 | theIsoSpinZ = right.theIsoSpinZ; |
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| 110 | theSpinZ = right.theSpinZ; |
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| 111 | } |
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| 112 | |
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| 113 | G4QParton::G4QParton(const G4QParton* right) |
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| 114 | { |
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| 115 | PDGencoding = right->PDGencoding; |
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| 116 | theMomentum = right->theMomentum; |
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| 117 | thePosition = right->thePosition; |
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| 118 | theX = right->theX; |
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| 119 | theDefinition = right->theDefinition; |
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| 120 | theColour = right->theColour; |
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| 121 | theIsoSpinZ = right->theIsoSpinZ; |
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| 122 | theSpinZ = right->theSpinZ; |
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| 123 | } |
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| 124 | |
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| 125 | const G4QParton& G4QParton::operator=(const G4QParton &right) |
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| 126 | { |
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| 127 | if(this != &right) // Beware of self assignment |
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| 128 | { |
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| 129 | PDGencoding=right.GetPDGCode(); |
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| 130 | theMomentum=right.Get4Momentum(); |
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| 131 | thePosition=right.GetPosition(); |
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| 132 | theX = right.theX; |
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| 133 | theDefinition = right.theDefinition; |
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| 134 | theColour = right.theColour; |
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| 135 | theIsoSpinZ = right.theIsoSpinZ; |
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| 136 | theSpinZ = right.theSpinZ; |
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| 137 | } |
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| 138 | return *this; |
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| 139 | } |
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| 140 | |
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| 141 | G4QParton::~G4QParton() |
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| 142 | { |
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| 143 | //G4cout << "G4QParton::~G4QParton(): this = "<<this <<G4endl; |
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| 144 | //G4cout << "break here"<<this <<G4endl; |
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| 145 | } |
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| 146 | |
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| 147 | void G4QParton::DefineMomentumInZ(G4double aLightConeMomentum, G4bool aDirection) |
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| 148 | { |
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| 149 | G4double Mass = GetMass(); |
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| 150 | G4LorentzVector a4Momentum = Get4Momentum(); |
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| 151 | aLightConeMomentum*=theX; |
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| 152 | G4double TransverseMass2 = sqr(a4Momentum.px()) + sqr(a4Momentum.py()) + sqr(Mass); |
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| 153 | a4Momentum.setPz(0.5*(aLightConeMomentum - TransverseMass2/aLightConeMomentum) * |
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| 154 | (aDirection? 1: -1)); |
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| 155 | a4Momentum.setE( 0.5*(aLightConeMomentum + TransverseMass2/aLightConeMomentum)); |
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| 156 | Set4Momentum(a4Momentum); |
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| 157 | } |
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