1 /**************************************************************************
2 * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
4 * Author: The ALICE Off-line Project. *
5 * Contributors are mentioned in the code where appropriate. *
7 * Permission to use, copy, modify and distribute this software and its *
8 * documentation strictly for non-commercial purposes is hereby granted *
9 * without fee, provided that the above copyright notice appears in all *
10 * copies and that both the copyright notice and this permission notice *
11 * appear in the supporting documentation. The authors make no claims *
12 * about the suitability of this software for any purpose. It is *
13 * provided "as is" without express or implied warranty. *
14 **************************************************************************/
18 // Container class for AliGenerator through recursion.
19 // Container is itself an AliGenerator.
20 // What is stored are not the pointers to the generators directly but to objects of type
21 // AliGenCocktail entry.
22 // The class provides also iterator functionality.
23 // Author: andreas.morsch@cern.ch
27 #include <TObjArray.h>
30 #include "AliGenCocktail.h"
31 #include "AliGenCocktailEntry.h"
32 #include "AliCollisionGeometry.h"
36 #include "AliGenCocktailEventHeader.h"
38 ClassImp(AliGenCocktail)
40 AliGenCocktail::AliGenCocktail()
45 fUsePerEventRate(kFALSE),
54 fTitle= "Particle Generator using cocktail of generators";
57 AliGenCocktail::~AliGenCocktail()
62 // delete fHeader; // It is removed in AliRunLoader
67 AddGenerator(AliGenerator *Generator, const char* Name, Float_t RateExp, TFormula* formula)
70 // Add a generator to the list
71 // First check that list exists
72 if (!fEntries) fEntries = new TList();
73 fTotalRate += RateExp;
75 // Forward parameters to the new generator
76 if(TestBit(kPtRange) && !(Generator->TestBit(kPtRange)) && !(Generator->TestBit(kMomentumRange)))
77 Generator->SetPtRange(fPtMin,fPtMax);
78 if(TestBit(kMomentumRange) && !(Generator->TestBit(kPtRange)) && !(Generator->TestBit(kMomentumRange)))
79 Generator->SetMomentumRange(fPMin,fPMax);
81 if (TestBit(kYRange) && !(Generator->TestBit(kYRange)))
82 Generator->SetYRange(fYMin,fYMax);
83 if (TestBit(kPhiRange) && !(Generator->TestBit(kPhiRange)))
84 Generator->SetPhiRange(fPhiMin*180/TMath::Pi(),fPhiMax*180/TMath::Pi());
85 if (TestBit(kThetaRange) && !(Generator->TestBit(kThetaRange)) && !(Generator->TestBit(kEtaRange)))
86 Generator->SetThetaRange(fThetaMin*180/TMath::Pi(),fThetaMax*180/TMath::Pi());
87 if (!(Generator->TestBit(kVertexRange))) {
88 Generator->SetOrigin(fOrigin[0], fOrigin[1], fOrigin[2]);
89 Generator->SetSigma(fOsigma[0], fOsigma[1], fOsigma[2]);
90 Generator->SetVertexSmear(fVertexSmear);
91 Generator->SetVertexSource(kContainer);
93 Generator->SetTrackingFlag(fTrackIt);
94 Generator->SetContainer(this);
98 // Add generator to list
100 snprintf(theName, 256, "%s_%d",Name, fNGenerators);
101 Generator->SetName(theName);
103 AliGenCocktailEntry *entry =
104 new AliGenCocktailEntry(Generator, Name, RateExp);
105 if (formula) entry->SetFormula(formula);
106 fEntries->Add(entry);
114 void AliGenCocktail::Init()
117 TIter next(fEntries);
118 AliGenCocktailEntry *entry;
120 // Loop over generators and initialize
121 while((entry = (AliGenCocktailEntry*)next())) {
122 if (fStack) entry->Generator()->SetStack(fStack);
123 entry->Generator()->Init();
129 fProb.Set(fNGenerators);
132 while((entry = (AliGenCocktailEntry*)next())) {
133 sum += entry->Rate();
139 while((entry = (AliGenCocktailEntry*)next())) {
140 psum += entry->Rate() / sum;
147 void AliGenCocktail::FinishRun()
150 TIter next(fEntries);
151 AliGenCocktailEntry *entry;
153 // Loop over generators and initialize
154 while((entry = (AliGenCocktailEntry*)next())) {
155 entry->Generator()->FinishRun();
159 void AliGenCocktail::Generate()
163 TIter next(fEntries);
164 AliGenCocktailEntry *entry = 0;
165 AliGenCocktailEntry *preventry = 0;
166 AliGenCocktailEntry *collentry = 0;
167 AliGenerator* gen = 0;
168 if (fHeader) delete fHeader;
171 fHeader = new AliGenCocktailEventHeader("Cocktail Header");
173 const TObjArray *partArray = gAlice->GetMCApp()->Particles();
176 // Generate the vertex position used by all generators
178 if(fVertexSmear == kPerEvent) Vertex();
182 for (Int_t j=0; j < 3; j++) eventVertex[j] = fVertex[j];
186 // Loop over generators and generate events
188 while((entry = (AliGenCocktailEntry*)next())) {
190 if (fUsePerEventRate && (gRandom->Rndm() > entry->Rate())) continue;
196 entry->SetFirst((partArray->GetEntriesFast())+1);
198 gen = entry->Generator();
199 if (gen->ProvidesCollisionGeometry()) collentry = entry;
201 // Handle case in which current generator needs collision geometry from previous generator
203 if (gen->NeedsCollisionGeometry() && (entry->Formula() == 0))
205 if (preventry && preventry->Generator()->ProvidesCollisionGeometry())
207 gen->SetCollisionGeometry(preventry->Generator()->CollisionGeometry());
209 Fatal("Generate()", "No Collision Geometry Provided");
213 // Number of signals is calculated from Collision Geometry
214 // and entry with given centrality bin is selected
216 if (entry->Formula() != 0)
219 Fatal("Generate()", "No Collision Geometry Provided");
222 AliCollisionGeometry* coll = (collentry->Generator())->CollisionGeometry();
223 Float_t b = coll->ImpactParameter();
224 Int_t nsig = Int_t(entry->Formula()->Eval(b));
225 Int_t bin = entry->Bin() - 100;
227 if (bin != nsig) continue;
229 if (nsig < 1) nsig = 1;
230 AliInfo(Form("Signal Events %13.3f %5d %5d\n", b, coll->HardScatters(), nsig));
235 gen->SetVertex(fVertex.At(0), fVertex.At(1), fVertex.At(2));
237 for (Int_t i = 0; i < ntimes; i++) gen->Generate();
238 entry->SetLast(partArray->GetEntriesFast());
241 } else if (fRandom) {
243 // Select a generator randomly
246 Float_t p0 = gRandom->Rndm();
248 for (i = 0; i < fNGenerators; i++) {
249 if (p0 < fProb[i]) break;
252 entry = (AliGenCocktailEntry*) fEntries->At(i);
254 gen = entry->Generator();
255 gen->SetVertex(fVertex.At(0), fVertex.At(1), fVertex.At(2));
257 entry->SetLast(partArray->GetEntriesFast());
263 fHeader->SetPrimaryVertex(eventVertex);
264 fHeader->CalcNProduced();
265 gAlice->SetGenEventHeader(fHeader);
268 void AliGenCocktail::SetVertexSmear(VertexSmear_t smear)
270 // Set vertex smearing and propagate it to the generators
272 AliGenerator::SetVertexSmear(smear);
273 TIter next(fEntries);
274 while (AliGenCocktailEntry* entry = (AliGenCocktailEntry*)next()) {
275 entry->Generator()->SetVertexSmear(smear);
279 AliGenCocktailEntry * AliGenCocktail::FirstGenerator()
281 // Iterator over generators: Initialisation
282 flnk1 = fEntries->FirstLink();
284 return (AliGenCocktailEntry*) (flnk1->GetObject());
290 AliGenCocktailEntry* AliGenCocktail::NextGenerator()
292 // Iterator over generators: Increment
293 flnk1 = flnk1->Next();
295 return (AliGenCocktailEntry*) (flnk1->GetObject());
301 void AliGenCocktail::
302 FirstGeneratorPair(AliGenCocktailEntry*& e1, AliGenCocktailEntry*& e2)
304 // Iterator over generator pairs: Initialisation
305 flnk2 = flnk1 = fEntries->FirstLink();
307 e2 = e1 = (AliGenCocktailEntry*) (flnk1->GetObject());
313 void AliGenCocktail::
314 NextGeneratorPair(AliGenCocktailEntry*& e1, AliGenCocktailEntry*& e2)
316 // Iterator over generators: Increment
317 flnk2 = flnk2->Next();
319 e1 = (AliGenCocktailEntry*) (flnk1->GetObject());
320 e2 = (AliGenCocktailEntry*) (flnk2->GetObject());
322 flnk2 = flnk1 = flnk1->Next();
324 e1 = (AliGenCocktailEntry*) (flnk1->GetObject());
325 e2 = (AliGenCocktailEntry*) (flnk2->GetObject());
333 void AliGenCocktail::AddHeader(AliGenEventHeader* header)
335 // Add a header to the list
336 if (fHeader) fHeader->AddHeader(header);