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26 #include "G4QGSMSplitableHadron.hh" 23 #include "G4QGSMSplitableHadron.hh"
27 #include "G4PhysicalConstants.hh" <<
28 #include "G4SystemOfUnits.hh" <<
29 #include "G4ParticleTable.hh" 24 #include "G4ParticleTable.hh"
30 #include "G4PionPlus.hh" 25 #include "G4PionPlus.hh"
31 #include "G4PionMinus.hh" 26 #include "G4PionMinus.hh"
32 #include "G4Gamma.hh" 27 #include "G4Gamma.hh"
33 #include "G4PionZero.hh" 28 #include "G4PionZero.hh"
34 #include "G4KaonPlus.hh" 29 #include "G4KaonPlus.hh"
35 #include "G4KaonMinus.hh" 30 #include "G4KaonMinus.hh"
36 31
37 #include "G4Log.hh" <<
38 #include "G4Pow.hh" <<
39 <<
40 // based on prototype by Maxim Komogorov 32 // based on prototype by Maxim Komogorov
41 // Splitting into methods, and centralizing of 33 // Splitting into methods, and centralizing of model parameters HPW Feb 1999
42 // restructuring HPW Feb 1999 34 // restructuring HPW Feb 1999
43 // fixing bug in the sampling of 'x', HPW Feb 35 // fixing bug in the sampling of 'x', HPW Feb 1999
44 // fixing bug in sampling pz, HPW Feb 1999. 36 // fixing bug in sampling pz, HPW Feb 1999.
45 // Code now also good for p-nucleus scattering 37 // Code now also good for p-nucleus scattering (before only p-p), HPW Feb 1999.
46 // Using Parton more directly, HPW Feb 1999. 38 // Using Parton more directly, HPW Feb 1999.
47 // Shortening the algorithm for sampling x, HP 39 // Shortening the algorithm for sampling x, HPW Feb 1999.
48 // sampling of x replaced by formula, taking X 40 // sampling of x replaced by formula, taking X_min into account in the correlated sampling. HPW, Feb 1999.
49 // logic much clearer now. HPW Feb 1999 41 // logic much clearer now. HPW Feb 1999
50 // Removed the ordering problem. No Direction 42 // Removed the ordering problem. No Direction needed in selection of valence quark types. HPW Mar'99.
51 // Fixing p-t distributions for scattering of 43 // Fixing p-t distributions for scattering of nuclei.
52 // Separating out parameters. 44 // Separating out parameters.
53 45
54 void G4QGSMSplitableHadron::InitParameters() 46 void G4QGSMSplitableHadron::InitParameters()
55 { 47 {
56 // changing rapidity distribution for all 48 // changing rapidity distribution for all
57 alpha = -0.5; // Note that this number is st 49 alpha = -0.5; // Note that this number is still assumed in the algorithm
58 // needs to be generalized. << 50 // needs to be generalized.
59 // changing rapidity distribution for projec 51 // changing rapidity distribution for projectile like
60 beta = 2.5;// Note that this number is still 52 beta = 2.5;// Note that this number is still assumed in the algorithm
61 // needs to be generalized. << 53 // needs to be generalized.
62 theMinPz = 0.5*G4PionMinus::PionMinus()->Get << 54 theMinPz = 0.5*G4PionMinus::PionMinus()->GetPDGMass();
63 // theMinPz = 0.1*G4PionMinus::PionMinus()- << 55 // theMinPz = 0.1*G4PionMinus::PionMinus()->GetPDGMass();
64 // theMinPz = G4PionMinus::PionMinus()->Get << 56 // theMinPz = G4PionMinus::PionMinus()->GetPDGMass();
65 // as low as possible, otherwise, we have un 57 // as low as possible, otherwise, we have unphysical boundary conditions in the sampling.
66 StrangeSuppress = 0.48; 58 StrangeSuppress = 0.48;
67 sigmaPt = 0.*GeV; // widens eta slightly, if << 59 sigmaPt = 0.*GeV; // widens eta slightly, if increased to 1.7,
68 // but Maxim's algorithm breaks energy conse << 60 // but Maxim's algorithm breaks energy conservation
69 widthOfPtSquare = 0.5*sqr(GeV); << 61 // to be revised.
>> 62 widthOfPtSquare = 0.01*GeV*GeV;
70 Direction = FALSE; 63 Direction = FALSE;
71 minTransverseMass = 1*keV; 64 minTransverseMass = 1*keV;
72 iP =0;// Color.begin(); <<
73 iAP =0;// AntiColor.begin(); <<
74 } 65 }
75 66
76 G4QGSMSplitableHadron::G4QGSMSplitableHadron() 67 G4QGSMSplitableHadron::G4QGSMSplitableHadron()
77 { 68 {
78 InitParameters(); 69 InitParameters();
79 } 70 }
80 71
81 G4QGSMSplitableHadron::G4QGSMSplitableHadron(c 72 G4QGSMSplitableHadron::G4QGSMSplitableHadron(const G4ReactionProduct & aPrimary, G4bool aDirection)
82 :G4VSplitableHadron(aPrimary) << 73 :G4VSplitableHadron(aPrimary)
83 { 74 {
84 InitParameters(); 75 InitParameters();
85 Direction = aDirection; 76 Direction = aDirection;
86 } 77 }
87 78
88 << 79
89 G4QGSMSplitableHadron::G4QGSMSplitableHadron(c 80 G4QGSMSplitableHadron::G4QGSMSplitableHadron(const G4ReactionProduct & aPrimary)
90 : G4VSplitableHadron(aPrimary) << 81 : G4VSplitableHadron(aPrimary)
91 { 82 {
92 InitParameters(); 83 InitParameters();
93 } 84 }
94 85
95 G4QGSMSplitableHadron::G4QGSMSplitableHadron(c 86 G4QGSMSplitableHadron::G4QGSMSplitableHadron(const G4Nucleon & aNucleon)
96 : G4VSplitableHadron(aNucleon) << 87 : G4VSplitableHadron(aNucleon)
97 { 88 {
98 InitParameters(); 89 InitParameters();
99 } 90 }
100 91
101 G4QGSMSplitableHadron::G4QGSMSplitableHadron(c 92 G4QGSMSplitableHadron::G4QGSMSplitableHadron(const G4Nucleon & aNucleon, G4bool aDirection)
102 : G4VSplitableHadron(aNucleon) << 93 : G4VSplitableHadron(aNucleon)
103 { 94 {
104 InitParameters(); 95 InitParameters();
105 Direction = aDirection; 96 Direction = aDirection;
106 } 97 }
107 98
108 G4QGSMSplitableHadron::~G4QGSMSplitableHadron( << 99 G4QGSMSplitableHadron::~G4QGSMSplitableHadron(){}
109 100
>> 101 const G4QGSMSplitableHadron & G4QGSMSplitableHadron::operator=(const G4QGSMSplitableHadron &)
>> 102 {
>> 103 throw G4HadronicException(__FILE__, __LINE__, "G4QGSMSplitableHadron::operator= meant to not be accessable");
>> 104 return *this;
>> 105 }
110 106
111 //******************************************** <<
112 107
>> 108 //**************************************************************************************************************************
>> 109
113 void G4QGSMSplitableHadron::SplitUp() 110 void G4QGSMSplitableHadron::SplitUp()
114 { 111 {
115 if (IsSplit()) return; 112 if (IsSplit()) return;
116 Splitting(); // To mark that a hadron is sp << 113 Splitting();
117 if (Color.size()!=0) return; 114 if (Color.size()!=0) return;
118 if (GetSoftCollisionCount() == 0) // GetSof << 115 if (GetSoftCollisionCount() == 0)
119 { 116 {
120 DiffractiveSplitUp(); 117 DiffractiveSplitUp();
121 } 118 }
122 else 119 else
123 { 120 {
124 SoftSplitUp(); 121 SoftSplitUp();
125 } 122 }
126 } 123 }
127 << 124
128 void G4QGSMSplitableHadron::DiffractiveSplitUp 125 void G4QGSMSplitableHadron::DiffractiveSplitUp()
129 { 126 {
130 // take the particle definitions and get the 127 // take the particle definitions and get the partons HPW
131 G4Parton * Left = NULL; 128 G4Parton * Left = NULL;
132 G4Parton * Right = NULL; 129 G4Parton * Right = NULL;
133 GetValenceQuarkFlavors(GetDefinition(), Left 130 GetValenceQuarkFlavors(GetDefinition(), Left, Right);
134 Left->SetPosition(GetPosition()); 131 Left->SetPosition(GetPosition());
135 Right->SetPosition(GetPosition()); 132 Right->SetPosition(GetPosition());
136 << 133
137 G4LorentzVector HadronMom = Get4Momentum(); 134 G4LorentzVector HadronMom = Get4Momentum();
>> 135 //std::cout << "DSU 1 - "<<HadronMom<<std::endl;
138 136
139 G4double maxAvailMomentum2 = sqr(HadronMom.m << 137 // momenta of string ends
140 << 138 G4double pt2 = HadronMom.perp2();
>> 139 G4double transverseMass2 = HadronMom.plus()*HadronMom.minus();
>> 140 G4double maxAvailMomentum2 = sqr(std::sqrt(transverseMass2) - std::sqrt(pt2));
141 G4ThreeVector pt(minTransverseMass, minTrans 141 G4ThreeVector pt(minTransverseMass, minTransverseMass, 0);
142 if (maxAvailMomentum2/widthOfPtSquare>0.01) << 142 if(maxAvailMomentum2/widthOfPtSquare>0.01) pt = GaussianPt(widthOfPtSquare, maxAvailMomentum2);
>> 143 //std::cout << "DSU 1.1 - "<< maxAvailMomentum2<< pt <<std::endl;
143 144
144 G4LorentzVector LeftMom(pt, 0.); 145 G4LorentzVector LeftMom(pt, 0.);
145 G4LorentzVector RightMom; 146 G4LorentzVector RightMom;
146 RightMom.setPx(HadronMom.px() - pt.x()); 147 RightMom.setPx(HadronMom.px() - pt.x());
147 RightMom.setPy(HadronMom.py() - pt.y()); 148 RightMom.setPy(HadronMom.py() - pt.y());
>> 149 //std::cout << "DSU 2 - "<<RightMom<<" "<< LeftMom <<std::endl;
148 150
149 G4double Local1 = HadronMom.minus() + (Right 151 G4double Local1 = HadronMom.minus() + (RightMom.perp2() - LeftMom.perp2())/HadronMom.plus();
150 G4double Local2 = std::sqrt(std::max(0., sqr 152 G4double Local2 = std::sqrt(std::max(0., sqr(Local1) - 4.*RightMom.perp2()*HadronMom.minus()/HadronMom.plus()));
151 << 153 //std::cout << "DSU 3 - "<< Local1 <<" "<< Local2 <<std::endl;
152 if (Direction) Local2 = -Local2; << 154 if (Direction) Local2 = -Local2;
153 G4double RightMinus = 0.5*(Local1 + Local2 155 G4double RightMinus = 0.5*(Local1 + Local2);
154 G4double LeftMinus = HadronMom.minus() - Rig 156 G4double LeftMinus = HadronMom.minus() - RightMinus;
155 << 157 //std::cout << "DSU 4 - "<< RightMinus <<" "<< LeftMinus << " "<<HadronMom.minus() <<std::endl;
156 if (LeftMinus <= 0.) { <<
157 RightMinus = 0.5*(Local1 - Local2); <<
158 LeftMinus = HadronMom.minus() - RightMinus <<
159 } <<
160 158
161 G4double LeftPlus = LeftMom.perp2()/LeftMin 159 G4double LeftPlus = LeftMom.perp2()/LeftMinus;
162 G4double RightPlus = HadronMom.plus() - Left 160 G4double RightPlus = HadronMom.plus() - LeftPlus;
163 << 161 //std::cout << "DSU 5 - "<< RightPlus <<" "<< LeftPlus <<std::endl;
164 LeftMom.setPz(0.5*(LeftPlus - LeftMinus)); 162 LeftMom.setPz(0.5*(LeftPlus - LeftMinus));
165 LeftMom.setE (0.5*(LeftPlus + LeftMinus)); 163 LeftMom.setE (0.5*(LeftPlus + LeftMinus));
166 RightMom.setPz(0.5*(RightPlus - RightMinus)) 164 RightMom.setPz(0.5*(RightPlus - RightMinus));
167 RightMom.setE (0.5*(RightPlus + RightMinus)) 165 RightMom.setE (0.5*(RightPlus + RightMinus));
168 << 166 //std::cout << "DSU 6 - "<< LeftMom <<" "<< RightMom <<std::endl;
169 Left->Set4Momentum(LeftMom); 167 Left->Set4Momentum(LeftMom);
170 Right->Set4Momentum(RightMom); 168 Right->Set4Momentum(RightMom);
171 <<
172 Color.push_back(Left); 169 Color.push_back(Left);
173 AntiColor.push_back(Right); 170 AntiColor.push_back(Right);
174 iP=0; iAP=0; <<
175 } 171 }
176 172
177 173
178 void G4QGSMSplitableHadron::SoftSplitUp() 174 void G4QGSMSplitableHadron::SoftSplitUp()
179 { 175 {
180 G4int nSeaPair = GetSoftCollisionCount()-1; << 176 //... sample transversal momenta for sea and valence quarks
181 << 177 G4double phi, pts;
182 G4LorentzVector tmp(0., 0., 0., 0.); << 178 G4double SumPy = 0.;
183 << 179 G4double SumPx = 0.;
184 G4int aSeaPair; << 180 G4ThreeVector Pos = GetPosition();
185 for (aSeaPair = 0; aSeaPair < nSeaPair; aSea << 181 G4int nSeaPair = GetSoftCollisionCount()-1;
186 { << 182
187 // choose quark flavour, d:u:s = 1:1:(1/S << 183 // here the condition,to ensure viability of splitting, also in cases
188 G4int aPDGCode = 1 + (G4int)(G4UniformRand << 184 // where difractive excitation occured together with soft scattering.
189 << 185 // G4double LightConeMomentum = (Direction)? Get4Momentum().plus() : Get4Momentum().minus();
190 // BuildSeaQuark() determines quark spin, << 186 // G4double Xmin = theMinPz/LightConeMomentum;
191 // via parton-constructor G4Parton(aPDGCo << 187 G4double Xmin = theMinPz/( Get4Momentum().e() - GetDefinition()->GetPDGMass() );
192 G4Parton * aParton = BuildSeaQuark(false, << 188 while(Xmin>=1-(2*nSeaPair+1)*Xmin) Xmin*=0.95;
193 << 189
194 G4int firstPartonColour = aParton->GetColo << 190 G4int aSeaPair;
195 G4double firstPartonSpinZ = aParton->GetSp << 191 for (aSeaPair = 0; aSeaPair < nSeaPair; aSeaPair++)
196 << 192 {
197 aParton->Set4Momentum(tmp); << 193 // choose quark flavour, d:u:s = 1:1:(1/StrangeSuppress-2)
198 Color.push_back(aParton); << 194
199 << 195 G4int aPDGCode = 1 + (G4int)(G4UniformRand()/StrangeSuppress);
200 // create anti-quark << 196
201 aParton = BuildSeaQuark(true, aPDGCode, nS << 197 // BuildSeaQuark() determines quark spin, isospin and colour
202 aParton->SetSpinZ(-firstPartonSpinZ); << 198 // via parton-constructor G4Parton(aPDGCode)
203 aParton->SetColour(-firstPartonColour); << 199
204 AntiColor.push_back(aParton); << 200 G4Parton * aParton = BuildSeaQuark(false, aPDGCode, nSeaPair);
205 } << 201
206 << 202 // G4cerr << "G4QGSMSplitableHadron::SoftSplitUp()" << G4endl;
207 // Valence quark << 203
208 G4Parton* pColorParton = NULL; << 204 // G4cerr << "Parton 1: "
209 G4Parton* pAntiColorParton = NULL; << 205 // << " PDGcode: " << aPDGCode
210 GetValenceQuarkFlavors(GetDefinition(), pCol << 206 // << " - Name: " << aParton->GetDefinition()->GetParticleName()
211 << 207 // << " - Type: " << aParton->GetDefinition()->GetParticleType()
212 pColorParton->Set4Momentum(tmp); << 208 // << " - Spin-3: " << aParton->GetSpinZ()
213 pAntiColorParton->Set4Momentum(tmp); << 209 // << " - Colour: " << aParton->GetColour() << G4endl;
214 << 210
215 Color.push_back(pColorParton); << 211 // save colour a spin-3 for anti-quark
216 AntiColor.push_back(pAntiColorParton); << 212
217 << 213 G4int firstPartonColour = aParton->GetColour();
218 iP=0; iAP=0; << 214 G4double firstPartonSpinZ = aParton->GetSpinZ();
219 << 215
220 return; << 216 SumPx += aParton->Get4Momentum().px();
>> 217 SumPy += aParton->Get4Momentum().py();
>> 218 Color.push_back(aParton);
>> 219
>> 220 // create anti-quark
>> 221
>> 222 aParton = BuildSeaQuark(true, aPDGCode, nSeaPair);
>> 223 aParton->SetSpinZ(-firstPartonSpinZ);
>> 224 aParton->SetColour(-firstPartonColour);
>> 225
>> 226 // G4cerr << "Parton 2: "
>> 227 // << " PDGcode: " << -aPDGCode
>> 228 // << " - Name: " << aParton->GetDefinition()->GetParticleName()
>> 229 // << " - Type: " << aParton->GetDefinition()->GetParticleType()
>> 230 // << " - Spin-3: " << aParton->GetSpinZ()
>> 231 // << " - Colour: " << aParton->GetColour() << G4endl;
>> 232 // G4cerr << "------------" << G4endl;
>> 233
>> 234 SumPx += aParton->Get4Momentum().px();
>> 235 SumPy += aParton->Get4Momentum().py();
>> 236 AntiColor.push_back(aParton);
>> 237 }
>> 238 // Valence quark
>> 239 G4Parton* pColorParton = NULL;
>> 240 G4Parton* pAntiColorParton = NULL;
>> 241 GetValenceQuarkFlavors(GetDefinition(), pColorParton, pAntiColorParton);
>> 242 G4int ColorEncoding = pColorParton->GetPDGcode();
>> 243 G4int AntiColorEncoding = pAntiColorParton->GetPDGcode();
>> 244
>> 245 pts = sigmaPt*std::sqrt(-std::log(G4UniformRand()));
>> 246 phi = 2.*pi*G4UniformRand();
>> 247 G4double Px = pts*std::cos(phi);
>> 248 G4double Py = pts*std::sin(phi);
>> 249 SumPx += Px;
>> 250 SumPy += Py;
>> 251
>> 252 if (ColorEncoding < 0) // use particle definition
>> 253 {
>> 254 G4LorentzVector ColorMom(-SumPx, -SumPy, 0, 0);
>> 255 pColorParton->Set4Momentum(ColorMom);
>> 256 G4LorentzVector AntiColorMom(Px, Py, 0, 0);
>> 257 pAntiColorParton->Set4Momentum(AntiColorMom);
>> 258 }
>> 259 else
>> 260 {
>> 261 G4LorentzVector ColorMom(Px, Py, 0, 0);
>> 262 pColorParton->Set4Momentum(ColorMom);
>> 263 G4LorentzVector AntiColorMom(-SumPx, -SumPy, 0, 0);
>> 264 pAntiColorParton->Set4Momentum(AntiColorMom);
>> 265 }
>> 266 Color.push_back(pColorParton);
>> 267 AntiColor.push_back(pAntiColorParton);
>> 268
>> 269 // Sample X
>> 270 G4int nAttempt = 0;
>> 271 G4double SumX = 0;
>> 272 G4double aBeta = beta;
>> 273 G4double ColorX, AntiColorX;
>> 274 G4double HPWtest = 0;
>> 275 if (GetDefinition() == G4PionMinus::PionMinusDefinition()) aBeta = 1.;
>> 276 if (GetDefinition() == G4Gamma::GammaDefinition()) aBeta = 1.;
>> 277 if (GetDefinition() == G4PionPlus::PionPlusDefinition()) aBeta = 1.;
>> 278 if (GetDefinition() == G4PionZero::PionZeroDefinition()) aBeta = 1.;
>> 279 if (GetDefinition() == G4KaonPlus::KaonPlusDefinition()) aBeta = 0.;
>> 280 if (GetDefinition() == G4KaonMinus::KaonMinusDefinition()) aBeta = 0.;
>> 281 do
>> 282 {
>> 283 SumX = 0;
>> 284 nAttempt++;
>> 285 G4int NumberOfUnsampledSeaQuarks = 2*nSeaPair;
>> 286 G4double beta1 = beta;
>> 287 if (std::abs(ColorEncoding) <= 1000 && std::abs(AntiColorEncoding) <= 1000) beta1 = 1.; //... in a meson
>> 288 ColorX = SampleX(Xmin, NumberOfUnsampledSeaQuarks, 2*nSeaPair, aBeta);
>> 289 HPWtest = ColorX;
>> 290 while (ColorX < Xmin || ColorX > 1.|| 1. - ColorX <= Xmin);
>> 291 Color.back()->SetX(SumX = ColorX);// this is the valenz quark.
>> 292 for(G4int aPair = 0; aPair < nSeaPair; aPair++)
>> 293 {
>> 294 NumberOfUnsampledSeaQuarks--;
>> 295 ColorX = SampleX(Xmin, NumberOfUnsampledSeaQuarks, 2*nSeaPair, aBeta);
>> 296 Color[aPair]->SetX(ColorX);
>> 297 SumX += ColorX;
>> 298 NumberOfUnsampledSeaQuarks--;
>> 299 AntiColorX = SampleX(Xmin, NumberOfUnsampledSeaQuarks, 2*nSeaPair, aBeta);
>> 300 AntiColor[aPair]->SetX(AntiColorX); // the 'sea' partons
>> 301 SumX += AntiColorX;
>> 302 if (1. - SumX <= Xmin) break;
>> 303 }
>> 304 }
>> 305 while (1. - SumX <= Xmin);
>> 306 (*(AntiColor.end()-1))->SetX(1. - SumX); // the di-quark takes the rest, then go to momentum
>> 307 /// and here is the bug ;-) @@@@@@@@@@@@@
>> 308 if(getenv("debug_QGSMSplitableHadron") )G4cout << "particle energy at split = "<<Get4Momentum().t()<<G4endl;
>> 309 G4double lightCone = ((!Direction) ? Get4Momentum().minus() : Get4Momentum().plus());
>> 310 // lightCone -= 0.5*Get4Momentum().m();
>> 311 // hpw testing @@@@@ lightCone = 2.*Get4Momentum().t();
>> 312 if(getenv("debug_QGSMSplitableHadron") )G4cout << "Light cone = "<<lightCone<<G4endl;
>> 313 for(aSeaPair = 0; aSeaPair < nSeaPair+1; aSeaPair++)
>> 314 {
>> 315 G4Parton* aParton = Color[aSeaPair];
>> 316 aParton->DefineMomentumInZ(lightCone, Direction);
>> 317
>> 318 aParton = AntiColor[aSeaPair];
>> 319 aParton->DefineMomentumInZ(lightCone, Direction);
>> 320 }
>> 321 //--DEBUG-- cout <<G4endl<<"XSAMPLE "<<HPWtest<<G4endl;
>> 322 return;
221 } 323 }
222 324
223 << 325 void G4QGSMSplitableHadron::GetValenceQuarkFlavors(const G4ParticleDefinition * aPart, G4Parton *& Parton1, G4Parton *& Parton2)
224 void G4QGSMSplitableHadron::GetValenceQuarkFla <<
225 <<
226 { 326 {
227 // Note! convention aEnd = q or (qq)bar and << 327 // Note! convention aEnd = q or (qq)bar and bEnd = qbar or qq.
228 G4int aEnd=0; << 328 G4int aEnd;
229 G4int bEnd=0; << 329 G4int bEnd;
230 G4int HadronEncoding = aPart->GetPDGEncoding 330 G4int HadronEncoding = aPart->GetPDGEncoding();
231 if (aPart->GetBaryonNumber() == 0) << 331 if (aPart->GetBaryonNumber() == 0)
232 { 332 {
233 theMesonSplitter.SplitMeson(HadronEncoding << 333 theMesonSplitter.SplitMeson(HadronEncoding, &aEnd, &bEnd);
234 } 334 }
235 else 335 else
236 { 336 {
237 theBaryonSplitter.SplitBarion(HadronEncodi << 337 theBaryonSplitter.SplitBarion(HadronEncoding, &aEnd, &bEnd);
238 } << 338 }
239 339
240 Parton1 = new G4Parton(aEnd); 340 Parton1 = new G4Parton(aEnd);
241 Parton1->SetPosition(GetPosition()); 341 Parton1->SetPosition(GetPosition());
242 342
>> 343 // G4cerr << "G4QGSMSplitableHadron::GetValenceQuarkFlavors()" << G4endl;
>> 344 // G4cerr << "Parton 1: "
>> 345 // << " PDGcode: " << aEnd
>> 346 // << " - Name: " << Parton1->GetDefinition()->GetParticleName()
>> 347 // << " - Type: " << Parton1->GetDefinition()->GetParticleType()
>> 348 // << " - Spin-3: " << Parton1->GetSpinZ()
>> 349 // << " - Colour: " << Parton1->GetColour() << G4endl;
>> 350
243 Parton2 = new G4Parton(bEnd); 351 Parton2 = new G4Parton(bEnd);
244 Parton2->SetPosition(GetPosition()); 352 Parton2->SetPosition(GetPosition());
245 353
>> 354 // G4cerr << "Parton 2: "
>> 355 // << " PDGcode: " << bEnd
>> 356 // << " - Name: " << Parton2->GetDefinition()->GetParticleName()
>> 357 // << " - Type: " << Parton2->GetDefinition()->GetParticleType()
>> 358 // << " - Spin-3: " << Parton2->GetSpinZ()
>> 359 // << " - Colour: " << Parton2->GetColour() << G4endl;
>> 360 // G4cerr << "... now checking for color and spin conservation - yielding: " << G4endl;
>> 361
246 // colour of parton 1 choosen at random by G 362 // colour of parton 1 choosen at random by G4Parton(aEnd)
247 // colour of parton 2 is the opposite: 363 // colour of parton 2 is the opposite:
248 364
249 Parton2->SetColour(-(Parton1->GetColour())); 365 Parton2->SetColour(-(Parton1->GetColour()));
250 366
251 // isospin-3 of both partons is handled by G << 367 // isospin-3 of both partons is handled by G4Parton(PDGCode)
252 368
253 // spin-3 of parton 1 and 2 choosen at rando << 369 // spin-3 of parton 1 and 2 choosen at random by G4Parton(aEnd)
254 // spin-3 of parton 2 may be constrained by << 370 // spin-3 of parton 2 may be constrained by spin of original particle:
255 371
256 if ( std::abs(Parton1->GetSpinZ() + Parton2- << 372 if ( std::abs(Parton1->GetSpinZ() + Parton2->GetSpinZ()) > aPart->GetPDGSpin())
257 { 373 {
258 Parton2->SetSpinZ(-(Parton2->GetSpinZ())); << 374 Parton2->SetSpinZ(-(Parton2->GetSpinZ()));
259 } << 375 }
260 } <<
261 376
>> 377 // G4cerr << "Parton 2: "
>> 378 // << " PDGcode: " << bEnd
>> 379 // << " - Name: " << Parton2->GetDefinition()->GetParticleName()
>> 380 // << " - Type: " << Parton2->GetDefinition()->GetParticleType()
>> 381 // << " - Spin-3: " << Parton2->GetSpinZ()
>> 382 // << " - Colour: " << Parton2->GetColour() << G4endl;
>> 383 // G4cerr << "------------" << G4endl;
262 384
>> 385 }
>> 386
>> 387
263 G4ThreeVector G4QGSMSplitableHadron::GaussianP 388 G4ThreeVector G4QGSMSplitableHadron::GaussianPt(G4double widthSquare, G4double maxPtSquare)
264 { 389 {
265 G4double R; 390 G4double R;
266 const G4int maxNumberOfLoops = 1000; << 391 while((R = -widthSquare*std::log(G4UniformRand())) > maxPtSquare);
267 G4int loopCounter = -1; <<
268 while( ((R = -widthSquare*G4Log(G4UniformRan <<
269 ++loopCounter < maxNumberOfLoops ) {; <<
270 if ( loopCounter >= maxNumberOfLoops ) { <<
271 R = 0.99*maxPtSquare; // Just an acceptab <<
272 } <<
273 R = std::sqrt(R); 392 R = std::sqrt(R);
274 G4double phi = twopi*G4UniformRand(); 393 G4double phi = twopi*G4UniformRand();
275 return G4ThreeVector (R*std::cos(phi), R*std << 394 return G4ThreeVector (R*std::cos(phi), R*std::sin(phi), 0.);
276 } 395 }
277 396
278 <<
279 G4Parton * G4QGSMSplitableHadron:: 397 G4Parton * G4QGSMSplitableHadron::
280 BuildSeaQuark(G4bool isAntiQuark, G4int aPDGCo 398 BuildSeaQuark(G4bool isAntiQuark, G4int aPDGCode, G4int /* nSeaPair*/)
281 { 399 {
282 if (isAntiQuark) aPDGCode*=-1; 400 if (isAntiQuark) aPDGCode*=-1;
283 G4Parton* result = new G4Parton(aPDGCode); << 401 G4Parton* result = new G4Parton(aPDGCode);
284 result->SetPosition(GetPosition()); 402 result->SetPosition(GetPosition());
285 G4ThreeVector aPtVector = GaussianPt(sigmaPt 403 G4ThreeVector aPtVector = GaussianPt(sigmaPt, DBL_MAX);
286 G4LorentzVector a4Momentum(aPtVector, 0); 404 G4LorentzVector a4Momentum(aPtVector, 0);
287 result->Set4Momentum(a4Momentum); 405 result->Set4Momentum(a4Momentum);
288 return result; 406 return result;
289 } 407 }
290 408
291 <<
292 G4double G4QGSMSplitableHadron:: 409 G4double G4QGSMSplitableHadron::
293 SampleX(G4double anXmin, G4int nSea, G4int tot 410 SampleX(G4double anXmin, G4int nSea, G4int totalSea, G4double aBeta)
294 { 411 {
295 G4double result; 412 G4double result;
296 G4double x1, x2; 413 G4double x1, x2;
297 G4double ymax = 0; 414 G4double ymax = 0;
298 for(G4int ii=1; ii<100; ii++) << 415 for(G4int ii=0; ii<100; ii++)
299 { 416 {
300 G4double y = G4Pow::GetInstance()->powA(1. << 417 G4double y = std::pow(1./G4double(ii), alpha);
301 y *= G4Pow::GetInstance()->powN( G4Pow::Ge << 418 y *= std::pow( std::pow(1-anXmin-totalSea*anXmin, alpha+1) - std::pow(anXmin, alpha+1), nSea);
302 G4Pow::Ge << 419 y *= std::pow(1-anXmin-totalSea*anXmin, aBeta+1) - std::pow(anXmin, aBeta+1);
303 y *= G4Pow::GetInstance()->powA(1-anXmin-t << 420 if(y>ymax) ymax = y;
304 G4Pow::GetInstance()->powA(anXmin, aB <<
305 if (y>ymax) ymax = y; <<
306 } 421 }
307 G4double y; 422 G4double y;
308 G4double xMax=1-(totalSea+1)*anXmin; 423 G4double xMax=1-(totalSea+1)*anXmin;
309 if (anXmin > xMax) << 424 if(anXmin > xMax)
310 { 425 {
311 throw G4HadronicException(__FILE__, __LINE << 426 G4cout << "anXmin = "<<anXmin<<" nSea = "<<nSea<<" totalSea = "<< totalSea<<G4endl;
312 "G4QGSMSplitableHadron - Fatal: Ca << 427 throw G4HadronicException(__FILE__, __LINE__, "G4QGSMSplitableHadron - Fatal: Cannot sample parton densities under these constraints.");
313 } 428 }
314 const G4int maxNumberOfLoops = 1000; <<
315 G4int loopCounter = 0; <<
316 do 429 do
317 { 430 {
318 x1 = G4RandFlat::shoot(anXmin, xMax); << 431 x1 = CLHEP::RandFlat::shoot(anXmin, xMax);
319 y = G4Pow::GetInstance()->powA(x1, alpha); << 432 y = std::pow(x1, alpha);
320 y *= G4Pow::GetInstance()->powN( G4Pow::Ge << 433 y *= std::pow( std::pow(1-x1-totalSea*anXmin, alpha+1) - std::pow(anXmin, alpha+1), nSea);
321 G4Pow::Ge << 434 y *= std::pow(1-x1-totalSea*anXmin, aBeta+1) - std::pow(anXmin, aBeta+1);
322 y *= G4Pow::GetInstance()->powA(1-x1-total <<
323 G4Pow::GetInstance()->powA(anXmin, aB <<
324 x2 = ymax*G4UniformRand(); 435 x2 = ymax*G4UniformRand();
325 } while( (x2>y) && ++loopCounter < maxNumber <<
326 if ( loopCounter >= maxNumberOfLoops ) { <<
327 x1 = 0.5*( anXmin + xMax ); // Just an ac <<
328 } 436 }
>> 437 while(x2>y);
329 result = x1; 438 result = x1;
330 return result; << 439 return result;
331 } 440 }
332 441