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e40b9538 | 1 | /************************************************************************** |
2 | * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. * | |
3 | * * | |
4 | * Author: The ALICE Off-line Project. * | |
5 | * Contributors are mentioned in the code where appropriate. * | |
6 | * * | |
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 | **************************************************************************/ | |
15 | ||
16 | /* $Id: AliGenEMCocktail.cxx 40702 2010-04-26 13:09:52Z morsch $ */ | |
17 | ||
4ae1c9f0 | 18 | // Class to create the cocktail for physics with electrons, di-electrons, |
e40b9538 | 19 | // and photons from the decay of the following sources: |
20 | // pizero, eta, rho, omega, etaprime, phi | |
21 | // Kinematic distributions of the sources are taken from AliGenEMlib. | |
22 | // Decay channels can be selected via the method SetDecayMode. | |
23 | // Particles can be generated flat in pT with weights according to the | |
24 | // chosen pT distributions from AliGenEMlib (weighting mode: kNonAnalog), | |
25 | // or they are generated according to the pT distributions themselves | |
26 | // (weighting mode: kAnalog) | |
27 | ||
4ae1c9f0 | 28 | |
e40b9538 | 29 | #include <TObjArray.h> |
30 | #include <TParticle.h> | |
31 | #include <TF1.h> | |
32 | #include <TVirtualMC.h> | |
33 | #include <TPDGCode.h> | |
71443190 | 34 | #include <TDatabasePDG.h> |
e40b9538 | 35 | #include "AliGenCocktailEventHeader.h" |
36 | ||
37 | #include "AliGenCocktailEntry.h" | |
38 | #include "AliGenEMCocktail.h" | |
39 | #include "AliGenEMlib.h" | |
40 | #include "AliGenBox.h" | |
41 | #include "AliGenParam.h" | |
42 | #include "AliMC.h" | |
43 | #include "AliRun.h" | |
44 | #include "AliStack.h" | |
45 | #include "AliDecayer.h" | |
46 | #include "AliDecayerPythia.h" | |
47 | #include "AliLog.h" | |
48 | #include "AliGenCorrHF.h" | |
49 | ||
50 | ClassImp(AliGenEMCocktail) | |
51 | ||
52 | //________________________________________________________________________ | |
53 | AliGenEMCocktail::AliGenEMCocktail() | |
4ae1c9f0 | 54 | :AliGenCocktail(), |
e40b9538 | 55 | fDecayer(0), |
56 | fDecayMode(kAll), | |
57 | fWeightingMode(kNonAnalog), | |
58 | fNPart(1000), | |
4ae1c9f0 | 59 | fYieldArray(), |
1b589c8a | 60 | fPtSelect(AliGenEMlib::kPizero7TeVpp), |
61 | fCentrality(AliGenEMlib::kpp), | |
62 | fV2Systematic(AliGenEMlib::kNoV2Sys), | |
4ae1c9f0 | 63 | fForceConv(kFALSE), |
1b589c8a | 64 | fSelectedParticles(kGenPizero) |
e40b9538 | 65 | { |
4ae1c9f0 | 66 | // Constructor |
1b589c8a | 67 | SetHeaviestHadron(kGenPhi); |
e40b9538 | 68 | } |
69 | ||
70 | //_________________________________________________________________________ | |
71 | AliGenEMCocktail::~AliGenEMCocktail() | |
72 | { | |
4ae1c9f0 | 73 | // Destructor |
e40b9538 | 74 | |
75 | } | |
76 | ||
1b589c8a | 77 | //_________________________________________________________________________ |
78 | void AliGenEMCocktail::SetHeaviestHadron(ParticeGenerator_t part) | |
79 | { | |
80 | Int_t val=kGenPizero; | |
81 | while(val<part) val|=val<<1; | |
82 | ||
83 | fSelectedParticles=val; | |
84 | } | |
85 | ||
e40b9538 | 86 | //_________________________________________________________________________ |
87 | void AliGenEMCocktail::CreateCocktail() | |
88 | { | |
4ae1c9f0 | 89 | // create and add sources to the cocktail |
e40b9538 | 90 | |
91 | fDecayer->SetForceDecay(fDecayMode); | |
92 | fDecayer->ForceDecay(); | |
93 | ||
4ae1c9f0 | 94 | // Set kinematic limits |
e40b9538 | 95 | Double_t ptMin = fPtMin; |
96 | Double_t ptMax = fPtMax; | |
97 | Double_t yMin = fYMin;; | |
98 | Double_t yMax = fYMax;; | |
99 | Double_t phiMin = fPhiMin*180./TMath::Pi(); | |
100 | Double_t phiMax = fPhiMax*180./TMath::Pi(); | |
101 | AliInfo(Form("Ranges pT:%4.1f : %4.1f GeV/c, y:%4.2f : %4.2f, Phi:%5.1f : %5.1f degres",ptMin,ptMax,yMin,yMax,phiMin,phiMax)); | |
102 | AliInfo(Form("the parametrised sources uses the decay mode %d",fDecayMode)); | |
103 | ||
4ae1c9f0 | 104 | //Initialize user selection for Pt Parameterization and centrality: |
105 | AliGenEMlib::SelectParams(fPtSelect,fCentrality,fV2Systematic); | |
106 | ||
107 | // Create and add electron sources to the generator | |
4ae1c9f0 | 108 | // pizero |
6a8b015a | 109 | if(fSelectedParticles&kGenPizero){ |
4ae1c9f0 | 110 | AliGenParam *genpizero=0; |
e40b9538 | 111 | Char_t namePizero[10]; |
4ae1c9f0 | 112 | snprintf(namePizero,10,"Pizero"); |
1b589c8a | 113 | //fNPart/0.925: increase number of particles so that we have the chosen number of particles in the chosen eta range |
71443190 | 114 | genpizero = new AliGenParam(fNPart/0.925, new AliGenEMlib(), AliGenEMlib::kPizero, "DUMMY"); |
1b589c8a | 115 | //fYMin/0.925: increase eta range, so that the electron yield is constant (<5% change) over the chosen eta range |
71443190 | 116 | genpizero->SetYRange(fYMin/0.925, fYMax/0.925); |
e40b9538 | 117 | AddSource2Generator(namePizero,genpizero); |
118 | TF1 *fPtPizero = genpizero->GetPt(); | |
faf00b0d | 119 | #if ROOT_VERSION_CODE >= ROOT_VERSION(5,99,0) |
6a8b015a | 120 | fYieldArray[kPizero] = fPtPizero->Integral(fPtMin,fPtMax,1.e-6); |
faf00b0d | 121 | #else |
6a8b015a | 122 | fYieldArray[kPizero] = fPtPizero->Integral(fPtMin,fPtMax,(Double_t *)0,1.e-6); |
faf00b0d | 123 | #endif |
6a8b015a | 124 | } |
4ae1c9f0 | 125 | |
126 | // eta | |
6a8b015a | 127 | if(fSelectedParticles&kGenEta){ |
4ae1c9f0 | 128 | AliGenParam *geneta=0; |
e40b9538 | 129 | Char_t nameEta[10]; |
4ae1c9f0 | 130 | snprintf(nameEta,10,"Eta"); |
71443190 | 131 | geneta = new AliGenParam(fNPart/0.825, new AliGenEMlib(), AliGenEMlib::kEta, "DUMMY"); |
132 | geneta->SetYRange(fYMin/0.825, fYMax/0.825); | |
e40b9538 | 133 | AddSource2Generator(nameEta,geneta); |
134 | TF1 *fPtEta = geneta->GetPt(); | |
4ae1c9f0 | 135 | #if ROOT_VERSION_CODE >= ROOT_VERSION(5,99,0) |
6a8b015a | 136 | fYieldArray[kEta] = fPtEta->Integral(fPtMin,fPtMax,1.e-6); |
4ae1c9f0 | 137 | #else |
6a8b015a | 138 | fYieldArray[kEta] = fPtEta->Integral(fPtMin,fPtMax,(Double_t *)0,1.e-6); |
faf00b0d | 139 | #endif |
6a8b015a | 140 | } |
4ae1c9f0 | 141 | |
142 | // rho | |
6a8b015a | 143 | if(fSelectedParticles&kGenRho){ |
4ae1c9f0 | 144 | AliGenParam *genrho=0; |
e40b9538 | 145 | Char_t nameRho[10]; |
4ae1c9f0 | 146 | snprintf(nameRho,10,"Rho"); |
71443190 | 147 | genrho = new AliGenParam(fNPart/0.775, new AliGenEMlib(), AliGenEMlib::kRho, "DUMMY"); |
148 | genrho->SetYRange(fYMin/0.775, fYMax/0.775); | |
e40b9538 | 149 | AddSource2Generator(nameRho,genrho); |
150 | TF1 *fPtRho = genrho->GetPt(); | |
faf00b0d | 151 | #if ROOT_VERSION_CODE >= ROOT_VERSION(5,99,0) |
6a8b015a | 152 | fYieldArray[kRho] = fPtRho->Integral(fPtMin,fPtMax,1.e-6); |
faf00b0d | 153 | #else |
6a8b015a | 154 | fYieldArray[kRho] = fPtRho->Integral(fPtMin,fPtMax,(Double_t *)0,1.e-6); |
faf00b0d | 155 | #endif |
6a8b015a | 156 | } |
4ae1c9f0 | 157 | |
158 | // omega | |
6a8b015a | 159 | if(fSelectedParticles&kGenOmega){ |
4ae1c9f0 | 160 | AliGenParam *genomega=0; |
e40b9538 | 161 | Char_t nameOmega[10]; |
4ae1c9f0 | 162 | snprintf(nameOmega,10,"Omega"); |
71443190 | 163 | genomega = new AliGenParam(fNPart/0.775, new AliGenEMlib(), AliGenEMlib::kOmega, "DUMMY"); |
164 | genomega->SetYRange(fYMin/0.775, fYMax/0.775); | |
e40b9538 | 165 | AddSource2Generator(nameOmega,genomega); |
166 | TF1 *fPtOmega = genomega->GetPt(); | |
faf00b0d | 167 | #if ROOT_VERSION_CODE >= ROOT_VERSION(5,99,0) |
6a8b015a | 168 | fYieldArray[kOmega] = fPtOmega->Integral(fPtMin,fPtMax,1.e-6); |
faf00b0d | 169 | #else |
6a8b015a | 170 | fYieldArray[kOmega] = fPtOmega->Integral(fPtMin,fPtMax,(Double_t *)0,1.e-6); |
faf00b0d | 171 | #endif |
6a8b015a | 172 | } |
4ae1c9f0 | 173 | |
174 | // etaprime | |
6a8b015a | 175 | if(fSelectedParticles&kGenEtaprime){ |
4ae1c9f0 | 176 | AliGenParam *genetaprime=0; |
e40b9538 | 177 | Char_t nameEtaprime[10]; |
4ae1c9f0 | 178 | snprintf(nameEtaprime,10,"Etaprime"); |
71443190 | 179 | genetaprime = new AliGenParam(fNPart/0.725, new AliGenEMlib(), AliGenEMlib::kEtaprime, "DUMMY"); |
180 | genetaprime->SetYRange(fYMin/0.725, fYMax/0.725); | |
e40b9538 | 181 | AddSource2Generator(nameEtaprime,genetaprime); |
182 | TF1 *fPtEtaprime = genetaprime->GetPt(); | |
faf00b0d | 183 | #if ROOT_VERSION_CODE >= ROOT_VERSION(5,99,0) |
6a8b015a | 184 | fYieldArray[kEtaprime] = fPtEtaprime->Integral(fPtMin,fPtMax,1.e-6); |
faf00b0d | 185 | #else |
6a8b015a | 186 | fYieldArray[kEtaprime] = fPtEtaprime->Integral(fPtMin,fPtMax,(Double_t *)0,1.e-6); |
faf00b0d | 187 | #endif |
6a8b015a | 188 | } |
4ae1c9f0 | 189 | |
190 | // phi | |
6a8b015a | 191 | if(fSelectedParticles&kGenPhi){ |
4ae1c9f0 | 192 | AliGenParam *genphi=0; |
e40b9538 | 193 | Char_t namePhi[10]; |
4ae1c9f0 | 194 | snprintf(namePhi,10,"Phi"); |
71443190 | 195 | genphi = new AliGenParam(fNPart/0.725, new AliGenEMlib(), AliGenEMlib::kPhi, "DUMMY"); |
196 | genphi->SetYRange(fYMin/0.725, fYMax/0.725); | |
e40b9538 | 197 | AddSource2Generator(namePhi,genphi); |
198 | TF1 *fPtPhi = genphi->GetPt(); | |
faf00b0d | 199 | #if ROOT_VERSION_CODE >= ROOT_VERSION(5,99,0) |
6a8b015a | 200 | fYieldArray[kPhi] = fPtPhi->Integral(fPtMin,fPtMax,1.e-6); |
faf00b0d | 201 | #else |
6a8b015a | 202 | fYieldArray[kPhi] = fPtPhi->Integral(fPtMin,fPtMax,(Double_t *)0,1.e-6); |
faf00b0d | 203 | #endif |
6a8b015a | 204 | } |
4ae1c9f0 | 205 | |
206 | // jpsi | |
6a8b015a | 207 | if(fSelectedParticles&kGenJpsi){ |
4ae1c9f0 | 208 | AliGenParam *genjpsi=0; |
209 | Char_t nameJpsi[10]; | |
210 | snprintf(nameJpsi,10,"Jpsi"); | |
71443190 | 211 | genjpsi = new AliGenParam(fNPart/0.525, new AliGenEMlib(), AliGenEMlib::kJpsi, "DUMMY"); |
212 | genjpsi->SetYRange(fYMin/0.525, fYMax/0.525); | |
4ae1c9f0 | 213 | AddSource2Generator(nameJpsi,genjpsi); |
214 | TF1 *fPtJpsi = genjpsi->GetPt(); | |
215 | #if ROOT_VERSION_CODE >= ROOT_VERSION(5,99,0) | |
6a8b015a | 216 | fYieldArray[kJpsi] = fPtJpsi->Integral(fPtMin,fPtMax,1.e-6); |
4ae1c9f0 | 217 | #else |
6a8b015a | 218 | fYieldArray[kJpsi] = fPtJpsi->Integral(fPtMin,fPtMax,(Double_t *)0,1.e-6); |
71443190 | 219 | #endif |
6a8b015a | 220 | } |
71443190 | 221 | |
6a8b015a | 222 | // direct gamma |
223 | if(fDecayMode!=kGammaEM) return; | |
224 | if(fSelectedParticles&kGenDirectRealGamma){ | |
225 | AliGenParam *genDirectRealG=0; | |
226 | Char_t nameDirectRealG[10]; | |
227 | snprintf(nameDirectRealG,10,"DirectRealGamma"); | |
228 | genDirectRealG = new AliGenParam(fNPart, new AliGenEMlib(), AliGenEMlib::kDirectRealGamma, "DUMMY"); | |
229 | genDirectRealG->SetYRange(fYMin, fYMax); | |
230 | AddSource2Generator(nameDirectRealG,genDirectRealG); | |
231 | TF1 *fPtDirectRealG = genDirectRealG->GetPt(); | |
71443190 | 232 | #if ROOT_VERSION_CODE >= ROOT_VERSION(5,99,0) |
6a8b015a | 233 | fYieldArray[kDirectRealGamma] = fPtDirectRealG->Integral(fPtMin,fPtMax,1.e-6); |
71443190 | 234 | #else |
6a8b015a | 235 | fYieldArray[kDirectRealGamma] = fPtDirectRealG->Integral(fPtMin,fPtMax,(Double_t *)0,1.e-6); |
71443190 | 236 | #endif |
6a8b015a | 237 | } |
71443190 | 238 | |
6a8b015a | 239 | if(fSelectedParticles&kGenDirectVirtGamma){ |
240 | TDatabasePDG::Instance()->AddParticle("DirectVirtGamma","DirectVirtGamma",0,true,0,0,"GaugeBoson",220000); | |
241 | AliGenParam *genDirectVirtG=0; | |
242 | Char_t nameDirectVirtG[10]; | |
243 | snprintf(nameDirectVirtG,10,"DirectVirtGamma"); | |
244 | genDirectVirtG = new AliGenParam(fNPart/0.775, new AliGenEMlib(), AliGenEMlib::kDirectVirtGamma, "DUMMY"); | |
245 | genDirectVirtG->SetYRange(fYMin/0.775, fYMax/0.775); | |
246 | AddSource2Generator(nameDirectVirtG,genDirectVirtG); | |
247 | TF1 *fPtDirectVirtG = genDirectVirtG->GetPt(); | |
71443190 | 248 | #if ROOT_VERSION_CODE >= ROOT_VERSION(5,99,0) |
6a8b015a | 249 | fYieldArray[kDirectVirtGamma] = fPtDirectVirtG->Integral(fPtMin,fPtMax,1.e-6); |
71443190 | 250 | #else |
6a8b015a | 251 | fYieldArray[kDirectVirtGamma] = fPtDirectVirtG->Integral(fPtMin,fPtMax,(Double_t *)0,1.e-6); |
71443190 | 252 | #endif |
253 | } | |
e40b9538 | 254 | } |
255 | ||
256 | //------------------------------------------------------------------- | |
257 | void AliGenEMCocktail::AddSource2Generator(Char_t* nameSource, | |
258 | AliGenParam* const genSource) | |
259 | { | |
260 | // add sources to the cocktail | |
261 | Double_t phiMin = fPhiMin*180./TMath::Pi(); | |
262 | Double_t phiMax = fPhiMax*180./TMath::Pi(); | |
263 | ||
264 | genSource->SetPtRange(fPtMin, fPtMax); | |
e40b9538 | 265 | genSource->SetPhiRange(phiMin, phiMax); |
266 | genSource->SetWeighting(fWeightingMode); | |
4ae1c9f0 | 267 | genSource->SetForceGammaConversion(fForceConv); |
2942f542 | 268 | if (!TVirtualMC::GetMC()) genSource->SetDecayer(fDecayer); |
e40b9538 | 269 | genSource->Init(); |
270 | ||
271 | AddGenerator(genSource,nameSource,1.); // Adding Generator | |
272 | } | |
273 | ||
274 | //------------------------------------------------------------------- | |
275 | void AliGenEMCocktail::Init() | |
276 | { | |
4ae1c9f0 | 277 | // Initialisation |
e40b9538 | 278 | TIter next(fEntries); |
279 | AliGenCocktailEntry *entry; | |
280 | if (fStack) { | |
281 | while((entry = (AliGenCocktailEntry*)next())) { | |
282 | entry->Generator()->SetStack(fStack); | |
283 | } | |
284 | } | |
285 | } | |
286 | ||
287 | //_________________________________________________________________________ | |
288 | void AliGenEMCocktail::Generate() | |
289 | { | |
4ae1c9f0 | 290 | // Generate event |
e40b9538 | 291 | TIter next(fEntries); |
292 | AliGenCocktailEntry *entry = 0; | |
293 | AliGenCocktailEntry *preventry = 0; | |
294 | AliGenerator* gen = 0; | |
295 | ||
296 | if (fHeader) delete fHeader; | |
297 | fHeader = new AliGenCocktailEventHeader("Electromagnetic Cocktail Header"); | |
298 | ||
299 | const TObjArray *partArray = gAlice->GetMCApp()->Particles(); | |
300 | ||
4ae1c9f0 | 301 | // Generate the vertex position used by all generators |
e40b9538 | 302 | if(fVertexSmear == kPerEvent) Vertex(); |
303 | ||
4ae1c9f0 | 304 | //Reseting stack |
e40b9538 | 305 | AliRunLoader * runloader = AliRunLoader::Instance(); |
306 | if (runloader) | |
307 | if (runloader->Stack()) | |
308 | runloader->Stack()->Clean(); | |
309 | ||
4ae1c9f0 | 310 | // Loop over generators and generate events |
e40b9538 | 311 | Int_t igen = 0; |
6078e216 | 312 | Float_t evPlane; |
313 | Rndm(&evPlane,1); | |
314 | evPlane*=TMath::Pi()*2; | |
e40b9538 | 315 | while((entry = (AliGenCocktailEntry*)next())) { |
316 | gen = entry->Generator(); | |
e40b9538 | 317 | gen->SetVertex(fVertex.At(0), fVertex.At(1), fVertex.At(2)); |
318 | ||
319 | if (fNPart > 0) { | |
320 | igen++; | |
321 | if (igen == 1) entry->SetFirst(0); | |
322 | else entry->SetFirst((partArray->GetEntriesFast())+1); | |
6078e216 | 323 | gen->SetEventPlane(evPlane); |
e40b9538 | 324 | gen->Generate(); |
325 | entry->SetLast(partArray->GetEntriesFast()); | |
326 | preventry = entry; | |
327 | } | |
328 | } | |
329 | next.Reset(); | |
330 | ||
4ae1c9f0 | 331 | // Setting weights for proper absolute normalization |
e40b9538 | 332 | Int_t iPart, iMother; |
333 | Int_t pdgMother = 0; | |
334 | Double_t weight = 0.; | |
335 | Double_t dNdy = 0.; | |
336 | Int_t maxPart = partArray->GetEntriesFast(); | |
337 | for(iPart=0; iPart<maxPart; iPart++){ | |
338 | TParticle *part = gAlice->GetMCApp()->Particle(iPart); | |
339 | iMother = part->GetFirstMother(); | |
340 | TParticle *mother = 0; | |
341 | if (iMother>=0){ | |
342 | mother = gAlice->GetMCApp()->Particle(iMother); | |
343 | pdgMother = mother->GetPdgCode(); | |
344 | } | |
345 | else | |
346 | pdgMother = part->GetPdgCode(); | |
71443190 | 347 | |
e40b9538 | 348 | switch (pdgMother){ |
349 | case 111: | |
6a8b015a | 350 | dNdy = fYieldArray[kPizero]; |
e40b9538 | 351 | break; |
352 | case 221: | |
6a8b015a | 353 | dNdy = fYieldArray[kEta]; |
e40b9538 | 354 | break; |
355 | case 113: | |
6a8b015a | 356 | dNdy = fYieldArray[kRho]; |
e40b9538 | 357 | break; |
358 | case 223: | |
6a8b015a | 359 | dNdy = fYieldArray[kOmega]; |
e40b9538 | 360 | break; |
361 | case 331: | |
6a8b015a | 362 | dNdy = fYieldArray[kEtaprime]; |
e40b9538 | 363 | break; |
364 | case 333: | |
6a8b015a | 365 | dNdy = fYieldArray[kPhi]; |
e40b9538 | 366 | break; |
4ae1c9f0 | 367 | case 443: |
6a8b015a | 368 | dNdy = fYieldArray[kJpsi]; |
369 | break; | |
370 | case 22: | |
371 | dNdy = fYieldArray[kDirectRealGamma]; | |
4ae1c9f0 | 372 | break; |
6a8b015a | 373 | case 220000: |
374 | dNdy = fYieldArray[kDirectVirtGamma]; | |
375 | break; | |
376 | ||
e40b9538 | 377 | default: |
378 | dNdy = 0.; | |
379 | } | |
71443190 | 380 | |
e40b9538 | 381 | weight = dNdy*part->GetWeight(); |
382 | part->SetWeight(weight); | |
383 | } | |
384 | ||
385 | fHeader->SetNProduced(maxPart); | |
386 | ||
387 | ||
388 | TArrayF eventVertex; | |
389 | eventVertex.Set(3); | |
390 | for (Int_t j=0; j < 3; j++) eventVertex[j] = fVertex[j]; | |
391 | ||
392 | fHeader->SetPrimaryVertex(eventVertex); | |
393 | ||
394 | gAlice->SetGenEventHeader(fHeader); | |
395 | } |