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25 // 25 //
26 // 26 //
27 // 27 //
28 // ------------------------------------------- 28 // ------------------------------------------------------------
29 // GEANT 4 class implementation file 29 // GEANT 4 class implementation file
30 // 30 //
31 // ---------------- G4Parton ------------ 31 // ---------------- G4Parton ----------------
32 // by Gunter Folger, June 1998. 32 // by Gunter Folger, June 1998.
33 // class for Parton (inside a string) us 33 // class for Parton (inside a string) used by Parton String Models
34 // ------------------------------------------- 34 // ------------------------------------------------------------
35 35
36 #include "G4Parton.hh" 36 #include "G4Parton.hh"
37 #include "G4HadronicException.hh" 37 #include "G4HadronicException.hh"
38 38
39 G4Parton::G4Parton(G4int PDGcode) 39 G4Parton::G4Parton(G4int PDGcode)
40 { 40 {
41 PDGencoding=PDGcode; 41 PDGencoding=PDGcode;
42 theX = 0; 42 theX = 0;
43 theDefinition=G4ParticleTable::GetParticleTa 43 theDefinition=G4ParticleTable::GetParticleTable()->FindParticle(PDGencoding);
44 if (theDefinition == NULL) 44 if (theDefinition == NULL)
45 { 45 {
46 G4cout << "Encoding = "<<PDGencoding<<G4en 46 G4cout << "Encoding = "<<PDGencoding<<G4endl;
47 const G4String& text = "G4Parton::GetDefin << 47 G4String text = "G4Parton::GetDefinition(): Encoding not in particle table";
48 throw G4HadronicException(__FILE__, __LINE 48 throw G4HadronicException(__FILE__, __LINE__, text);
49 } 49 }
50 // 50 //
51 // colour by random in (1,2,3)=(R,G,B) for q 51 // colour by random in (1,2,3)=(R,G,B) for quarks and
52 // in (-1,-2,-3)=(Rbar,Gbar 52 // in (-1,-2,-3)=(Rbar,Gbar,Bbar) for anti-quarks:
53 // 53 //
54 if (theDefinition->GetParticleType() == "qua 54 if (theDefinition->GetParticleType() == "quarks") {
55 theColour = ((G4int)(3.*G4UniformRand())+1 55 theColour = ((G4int)(3.*G4UniformRand())+1)*(std::abs(PDGencoding)/PDGencoding) ;
56 } 56 }
57 // 57 //
58 // colour by random in (-1,-2,-3)=(Rbar,Gbar 58 // colour by random in (-1,-2,-3)=(Rbar,Gbar,Bbar)=(GB,RB,RG) for di-quarks and
59 // in (1,2,3)=(R,G,B)=(GB,R 59 // in (1,2,3)=(R,G,B)=(GB,RB,RG) for anti-di-quarks:
60 // 60 //
61 else if (theDefinition->GetParticleType() == 61 else if (theDefinition->GetParticleType() == "diquarks") {
62 theColour = -((G4int)(3.*G4UniformRand())+ 62 theColour = -((G4int)(3.*G4UniformRand())+1)*(std::abs(PDGencoding)/PDGencoding);
63 } 63 }
64 // 64 //
65 // colour by random in (-11,-12,...,-33)=(RR 65 // colour by random in (-11,-12,...,-33)=(RRbar,RGbar,RBbar,...,BBbar) for gluons:
66 // 66 //
67 else if (theDefinition->GetParticleType() == 67 else if (theDefinition->GetParticleType() == "gluons") {
68 theColour = -(((G4int)(3.*G4UniformRand()) 68 theColour = -(((G4int)(3.*G4UniformRand())+1)*10 + ((G4int)(3.*G4UniformRand())+1));
69 } 69 }
70 else { 70 else {
71 G4cout << "Encoding = "<<PDGencoding<<G4en 71 G4cout << "Encoding = "<<PDGencoding<<G4endl;
72 const G4String& text = "G4Parton::GetDefin << 72 G4String text = "G4Parton::GetDefinition(): Particle is not a parton";
73 throw G4HadronicException(__FILE__, __LINE 73 throw G4HadronicException(__FILE__, __LINE__, text);
74 } 74 }
75 // 75 //
76 // isospin-z from PDG-encoded isospin-z for 76 // isospin-z from PDG-encoded isospin-z for
77 // quarks, anti-quarks, di-quarks, and anti- 77 // quarks, anti-quarks, di-quarks, and anti-di-quarks:
78 // 78 //
79 if ((theDefinition->GetParticleType() == "qu 79 if ((theDefinition->GetParticleType() == "quarks") || (theDefinition->GetParticleType() == "diquarks")){
80 theIsoSpinZ = theDefinition->GetPDGIsospin 80 theIsoSpinZ = theDefinition->GetPDGIsospin3();
81 } 81 }
82 // 82 //
83 // isospin-z choosen at random from PDG-enco 83 // isospin-z choosen at random from PDG-encoded isospin for gluons (should be zero):
84 // 84 //
85 else { 85 else {
86 G4int thisPDGiIsospin=theDefinition->GetPD 86 G4int thisPDGiIsospin=theDefinition->GetPDGiIsospin();
87 if (thisPDGiIsospin == 0) { 87 if (thisPDGiIsospin == 0) {
88 theIsoSpinZ = 0; 88 theIsoSpinZ = 0;
89 } 89 }
90 else { 90 else {
91 theIsoSpinZ = ((G4int)((thisPDGiIsospin+ 91 theIsoSpinZ = ((G4int)((thisPDGiIsospin+1)*G4UniformRand()))-thisPDGiIsospin*0.5;
92 } 92 }
93 } 93 }
94 // 94 //
95 // spin-z choosen at random from PDG-encoded 95 // spin-z choosen at random from PDG-encoded spin:
96 // 96 //
97 G4int thisPDGiSpin=theDefinition->GetPDGiSpi 97 G4int thisPDGiSpin=theDefinition->GetPDGiSpin();
98 if (thisPDGiSpin == 0) { 98 if (thisPDGiSpin == 0) {
99 theSpinZ = 0; 99 theSpinZ = 0;
100 } 100 }
101 else { 101 else {
102 G4int rand=((G4int)((thisPDGiSpin+1)*G4Uni 102 G4int rand=((G4int)((thisPDGiSpin+1)*G4UniformRand()));
103 theSpinZ = rand-thisPDGiSpin*0.5;; 103 theSpinZ = rand-thisPDGiSpin*0.5;;
104 } 104 }
105 } 105 }
106 106
107 G4Parton::G4Parton(const G4Parton &right) 107 G4Parton::G4Parton(const G4Parton &right)
108 { 108 {
109 PDGencoding = right.PDGencoding; 109 PDGencoding = right.PDGencoding;
110 theMomentum = right.theMomentum; 110 theMomentum = right.theMomentum;
111 thePosition = right.thePosition; 111 thePosition = right.thePosition;
112 theX = right.theX; 112 theX = right.theX;
113 theDefinition = right.theDefinition; 113 theDefinition = right.theDefinition;
114 theColour = right.theColour; 114 theColour = right.theColour;
115 theIsoSpinZ = right.theIsoSpinZ; 115 theIsoSpinZ = right.theIsoSpinZ;
116 theSpinZ = right.theSpinZ; 116 theSpinZ = right.theSpinZ;
117 } 117 }
118 118
119 G4Parton & G4Parton::operator=(const G4Parton 119 G4Parton & G4Parton::operator=(const G4Parton &right)
120 { 120 {
121 if (this != &right) 121 if (this != &right)
122 { 122 {
123 PDGencoding=right.GetPDGcode(); 123 PDGencoding=right.GetPDGcode();
124 theMomentum=right.Get4Momentum(); 124 theMomentum=right.Get4Momentum();
125 thePosition=right.GetPosition(); 125 thePosition=right.GetPosition();
126 theX = right.theX; 126 theX = right.theX;
127 theDefinition = right.theDefinition; 127 theDefinition = right.theDefinition;
128 theColour = right.theColour; 128 theColour = right.theColour;
129 theIsoSpinZ = right.theIsoSpinZ; 129 theIsoSpinZ = right.theIsoSpinZ;
130 theSpinZ = right.theSpinZ; 130 theSpinZ = right.theSpinZ;
131 } 131 }
132 132
133 return *this; 133 return *this;
134 } 134 }
135 135
136 G4Parton::~G4Parton() 136 G4Parton::~G4Parton()
137 { 137 {
138 // cout << "G4Parton::~G4Parton(): this = "<< 138 // cout << "G4Parton::~G4Parton(): this = "<<this <<endl;
139 // cout << "break here"<<this <<endl; 139 // cout << "break here"<<this <<endl;
140 } 140 }
141 141
142 void G4Parton::DefineMomentumInZ(G4double aLig 142 void G4Parton::DefineMomentumInZ(G4double aLightConeMomentum, G4bool aDirection)
143 { 143 {
144 G4double Mass = GetMass(); 144 G4double Mass = GetMass();
145 G4LorentzVector a4Momentum = Get4Momentum(); 145 G4LorentzVector a4Momentum = Get4Momentum();
146 aLightConeMomentum*=theX; 146 aLightConeMomentum*=theX;
147 G4double TransverseMass2 = sqr(a4Momentum.px 147 G4double TransverseMass2 = sqr(a4Momentum.px()) + sqr(a4Momentum.py()) + sqr(Mass);
148 a4Momentum.setPz(0.5*(aLightConeMomentum - T 148 a4Momentum.setPz(0.5*(aLightConeMomentum - TransverseMass2/aLightConeMomentum)*(aDirection? 1: -1));
149 a4Momentum.setE( 0.5*(aLightConeMomentum + T 149 a4Momentum.setE( 0.5*(aLightConeMomentum + TransverseMass2/aLightConeMomentum));
150 Set4Momentum(a4Momentum); 150 Set4Momentum(a4Momentum);
151 } 151 }
152 152
153 void G4Parton::DefineMomentumInZ(G4double aLig 153 void G4Parton::DefineMomentumInZ(G4double aLightConeMomentum,G4double aLightConeE, G4bool aDirection)
154 { 154 {
155 G4double Mass = GetMass(); 155 G4double Mass = GetMass();
156 G4LorentzVector a4Momentum = Get4Momentum(); 156 G4LorentzVector a4Momentum = Get4Momentum();
157 aLightConeMomentum*=theX; 157 aLightConeMomentum*=theX;
158 aLightConeE*=theX; 158 aLightConeE*=theX;
159 G4double TransverseMass2 = sqr(a4Momentum.px 159 G4double TransverseMass2 = sqr(a4Momentum.px()) + sqr(a4Momentum.py()) + sqr(Mass);
160 a4Momentum.setPz(0.5*(aLightConeMomentum - a 160 a4Momentum.setPz(0.5*(aLightConeMomentum - aLightConeE - TransverseMass2/aLightConeMomentum)*(aDirection? 1: -1));
161 a4Momentum.setE( 0.5*(aLightConeMomentum + a 161 a4Momentum.setE( 0.5*(aLightConeMomentum + aLightConeE + TransverseMass2/aLightConeMomentum));
162 Set4Momentum(a4Momentum); 162 Set4Momentum(a4Momentum);
163 } 163 }
164 164