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[u/mrichter/AliRoot.git] / PWG4 / CorrelationsDPhi / AliAnalysisTaskPhiCorrelations.cxx
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e0331fd9 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/* $Id:$ */
17
18#include <TROOT.h>
19#include <TChain.h>
20#include <TFile.h>
21#include <TList.h>
22#include <TMath.h>
23#include <TTree.h>
24#include <TH2F.h>
25#include <TRandom.h>
26
27#include "AliAnalysisTaskPhiCorrelations.h"
28#include "AliAnalyseLeadingTrackUE.h"
29#include "AliUEHistograms.h"
30#include "AliUEHist.h"
31
e0331fd9 32#include "AliAnalysisManager.h"
33#include "AliAODHandler.h"
34#include "AliAODInputHandler.h"
35#include "AliAODMCParticle.h"
e0331fd9 36#include "AliInputEventHandler.h"
37#include "AliLog.h"
38#include "AliMCEventHandler.h"
39#include "AliVParticle.h"
2a910c25 40#include "AliCFContainer.h"
e0331fd9 41
42#include "AliESDEvent.h"
43#include "AliESDInputHandler.h"
44#include "AliMultiplicity.h"
2a910c25 45#include "AliCentrality.h"
46#include "AliStack.h"
e0331fd9 47
2a910c25 48#include "AliEventPoolManager.h"
e0331fd9 49
50
51////////////////////////////////////////////////////////////////////////
52//
53// Analysis class for azimuthal correlation studies
54// Based on the UE task from Sara Vallero and Jan Fiete
55//
56// This class needs input AODs.
57// The output is a list of analysis-specific containers.
58//
59// The AOD can be either connected to the InputEventHandler
60// for a chain of AOD files
61// or
62// to the OutputEventHandler
63// for a chain of ESD files,
64// in this case the class should be in the train after the jet-finder
65//
66// Authors:
67// Jan Fiete Grosse-Oetringhaus
68//
69////////////////////////////////////////////////////////////////////////
70
71
72ClassImp( AliAnalysisTaskPhiCorrelations )
a1c31636 73ClassImp( AliDPhiBasicParticle )
e0331fd9 74
75//____________________________________________________________________
76AliAnalysisTaskPhiCorrelations:: AliAnalysisTaskPhiCorrelations(const char* name):
77AliAnalysisTask(name,""),
78// general configuration
79fDebug(0),
80fMode(0),
81fReduceMemoryFootprint(kFALSE),
eed401dc 82fFillMixed(kTRUE),
ac647b0f 83fMixingTracks(50000),
c3294f09 84fCompareCentralities(kFALSE),
1bba939a 85fTwoTrackEfficiencyStudy(kFALSE),
44af28f9 86fUseVtxAxis(kFALSE),
e0331fd9 87// pointers to UE classes
88fAnalyseUE(0x0),
89fHistos(0x0),
90fHistosMixed(0),
91fkTrackingEfficiency(0x0),
92// handlers and events
85bfac17 93fAOD(0x0),
94fESD(0x0),
e0331fd9 95fArrayMC(0x0),
96fInputHandler(0x0),
97fMcEvent(0x0),
98fMcHandler(0x0),
2a910c25 99fPoolMgr(0x0),
e0331fd9 100// histogram settings
101fListOfHistos(0x0),
102// event QA
103fnTracksVertex(1), // QA tracks pointing to principal vertex (= 3 default)
85bfac17 104fZVertex(7.),
2a910c25 105fCentralityMethod("V0M"),
e0331fd9 106// track cuts
107fTrackEtaCut(0.8),
108fPtMin(0.5),
109fFilterBit(0xFF),
110fSelectBit(0),
2a910c25 111fUseChargeHadrons(kFALSE),
c05ff6be 112fSelectCharge(0),
113fFillpT(kFALSE)
e0331fd9 114{
115 // Default constructor
116 // Define input and output slots here
117 // Input slot #0 works with a TChain
118 DefineInput(0, TChain::Class());
119 // Output slot #0 writes into a TList container
120 DefineOutput(0, TList::Class());
e0331fd9 121}
122
123AliAnalysisTaskPhiCorrelations::~AliAnalysisTaskPhiCorrelations()
124{
125 // destructor
126
127 if (fListOfHistos && !AliAnalysisManager::GetAnalysisManager()->IsProofMode())
128 delete fListOfHistos;
129}
130
131//____________________________________________________________________
132void AliAnalysisTaskPhiCorrelations::ConnectInputData(Option_t* /*option*/)
133{
134
135 // Connect the input data
136 if (fDebug > 1) AliInfo("ConnectInputData() ");
137
138 // Since AODs can either be connected to the InputEventHandler
139 // or to the OutputEventHandler ( the AOD is created by a previus task in the train )
140 // we need to get the pointer to the AODEvent correctly.
141
142 // Delta AODs are also accepted.
143
144 TObject* handler = AliAnalysisManager::GetAnalysisManager()->GetInputEventHandler();
145
85bfac17 146 if( handler && handler->InheritsFrom("AliAODInputHandler") )
147 { // input AOD
148 fAOD = ((AliAODInputHandler*)handler)->GetEvent();
149 if (fDebug > 1) AliInfo(" ==== Tracks and Jets from AliAODInputHandler");
150 }
151 else
152 { //output AOD
153 handler = AliAnalysisManager::GetAnalysisManager()->GetOutputEventHandler();
154 if (handler && handler->InheritsFrom("AliAODHandler") )
155 {
156 fAOD = ((AliAODHandler*)handler)->GetAOD();
157 if (fDebug > 1) AliInfo(" ==== Tracks and Jets from AliAODHandler");
158 }
159 else
160 { // no AOD
161 AliWarning("I can't get any AOD Event Handler");
162 }
163 }
164
165 if (handler && handler->InheritsFrom("AliESDInputHandler") )
166 { // input ESD
167 // pointer received per event in ::Exec
168 if (fDebug > 1) AliInfo(" ==== Tracks and Jets from AliESDInputHandler");
169 }
e0331fd9 170
171 // Initialize common pointers
172 Initialize();
e0331fd9 173}
174
175//____________________________________________________________________
176void AliAnalysisTaskPhiCorrelations::CreateOutputObjects()
177{
178 // Create the output container
179
180 if (fDebug > 1) AliInfo("CreateOutputObjects()");
181
182 // Initialize class with main algorithms, event and track selection.
183 fAnalyseUE = new AliAnalyseLeadingTrackUE();
2a910c25 184 fAnalyseUE->SetParticleSelectionCriteria(fFilterBit, fUseChargeHadrons, fTrackEtaCut, fPtMin);
e0331fd9 185 fAnalyseUE->SetDebug(fDebug);
85bfac17 186 fAnalyseUE->DefineESDCuts(fFilterBit);
e0331fd9 187
188 // Initialize output list of containers
189 if (fListOfHistos != NULL){
190 delete fListOfHistos;
191 fListOfHistos = NULL;
192 }
193 if (!fListOfHistos){
194 fListOfHistos = new TList();
195 fListOfHistos->SetOwner(kTRUE);
196 }
197
198 // Initialize class to handle histograms
44af28f9 199 const char* histType = "4";
200 if (fUseVtxAxis)
201 histType = "5";
202 fHistos = new AliUEHistograms("AliUEHistogramsSame", histType);
203 fHistosMixed = new AliUEHistograms("AliUEHistogramsMixed", histType);
e0331fd9 204
2a910c25 205 fHistos->SetSelectCharge(fSelectCharge);
206 fHistosMixed->SetSelectCharge(fSelectCharge);
207
e0331fd9 208 // add histograms to list
209 fListOfHistos->Add(fHistos);
210 fListOfHistos->Add(fHistosMixed);
211
2a910c25 212 fListOfHistos->Add(new TH2F("trackletsVsV0Cent", ";L1 clusters;v0 centrality", 100, -0.5, 9999.5, 101, 0, 101));
213 fListOfHistos->Add(new TH2F("processIDs", ";#Delta#phi;process id", 100, -0.5 * TMath::Pi(), 1.5 * TMath::Pi(), kPNoProcess + 1, -0.5, kPNoProcess + 0.5));
c066889a 214 fListOfHistos->Add(new TH1F("eventStat", ";;events", 4, -0.5, 3.5));
215 fListOfHistos->Add(new TH1F("mixedDist", ";tracks;events", 200, 0, fMixingTracks * 1.5));
e0331fd9 216
1a32ecc0 217 PostData(0,fListOfHistos);
218
e0331fd9 219 // Add task configuration to output list
220 AddSettingsTree();
221
2a910c25 222 // event mixing
ac647b0f 223 Int_t trackDepth = fMixingTracks;
a1c31636 224 Int_t poolsize = 1000; // Maximum number of events, ignored in the present implemented of AliEventPool
c066889a 225
2a910c25 226 Int_t nCentralityBins = fHistos->GetUEHist(2)->GetEventHist()->GetNBins(1);
227 Double_t* centralityBins = (Double_t*) fHistos->GetUEHist(2)->GetEventHist()->GetAxis(1, 0)->GetXbins()->GetArray();
228
eb88bdfe 229 Int_t nZvtxBins = 7;
230 Double_t vertexBins[] = { -7, -5, -3, -1, 1, 3, 5, 7 };
231 Double_t* zvtxbin = vertexBins;
c066889a 232
eb88bdfe 233 if (fHistos->GetUEHist(2)->GetEventHist()->GetNVar() > 2)
234 {
235 nZvtxBins = fHistos->GetUEHist(2)->GetEventHist()->GetNBins(2);
236 zvtxbin = (Double_t*) fHistos->GetUEHist(2)->GetEventHist()->GetAxis(2, 0)->GetXbins()->GetArray();
237 }
85bfac17 238
2a910c25 239 fPoolMgr = new AliEventPoolManager(poolsize, trackDepth, nCentralityBins, centralityBins, nZvtxBins, zvtxbin);
e0331fd9 240}
241
242//____________________________________________________________________
243void AliAnalysisTaskPhiCorrelations::Exec(Option_t */*option*/)
244{
245 // array of MC particles
85bfac17 246 if (fMcHandler) {
247 if (fAOD)
248 {
249 fArrayMC = dynamic_cast<TClonesArray*>(fAOD->FindListObject(AliAODMCParticle::StdBranchName()));
250 if (!fArrayMC)
251 AliFatal("No array of MC particles found !!!");
252 }
2a910c25 253 fMcEvent = fMcHandler->MCEvent();
254 }
e0331fd9 255
85bfac17 256 // receive ESD pointer if we are not running AOD analysis
257 if (!fAOD)
258 {
259 AliVEventHandler* handler = AliAnalysisManager::GetAnalysisManager()->GetInputEventHandler();
260 if (handler && handler->InheritsFrom("AliESDInputHandler"))
261 fESD = ((AliESDInputHandler*)handler)->GetEvent();
262 }
263
e0331fd9 264 // Analyse the event
265 if (fMode) AnalyseCorrectionMode();
266 else AnalyseDataMode();
e0331fd9 267}
268
269/******************** ANALYSIS METHODS *****************************/
270
271//____________________________________________________________________
272void AliAnalysisTaskPhiCorrelations::AddSettingsTree()
273{
274 //Write settings to output list
275 TTree *settingsTree = new TTree("UEAnalysisSettings","Analysis Settings in UE estimation");
c05ff6be 276 settingsTree->Branch("fnTracksVertex", &fnTracksVertex,"nTracksVertex/I");
277 settingsTree->Branch("fZVertex", &fZVertex,"ZVertex/D");
278 //settingsTree->Branch("fCentralityMethod", fCentralityMethod.Data(),"CentralityMethod/C");
e0331fd9 279 settingsTree->Branch("fTrackEtaCut", &fTrackEtaCut, "TrackEtaCut/D");
280 settingsTree->Branch("fPtMin", &fPtMin, "PtMin/D");
c05ff6be 281 settingsTree->Branch("fFilterBit", &fFilterBit,"FilterBit/I");
282 settingsTree->Branch("fSelectBit", &fSelectBit,"EventSelectionBit/I");
e0331fd9 283 settingsTree->Branch("fUseChargeHadrons", &fUseChargeHadrons,"UseChHadrons/O");
c05ff6be 284 settingsTree->Branch("fSelectCharge", &fSelectCharge,"SelectCharge/I");
285 settingsTree->Branch("fFillpT", &fFillpT,"FillpT/O");
e0331fd9 286 settingsTree->Branch("fkTrackingEfficiency", "TH1D", &fkTrackingEfficiency);
ac647b0f 287 settingsTree->Branch("fMixingTracks", &fMixingTracks,"MixingTracks/I");
e0331fd9 288 settingsTree->Fill();
289 fListOfHistos->Add(settingsTree);
290}
291
292//____________________________________________________________________
293void AliAnalysisTaskPhiCorrelations::AnalyseCorrectionMode()
294{
295 // Run the analysis on MC to get the correction maps
296 //
297
2a910c25 298 if ( fDebug > 3 ) AliInfo( " Processing event in Corrections mode ..." );
299
300 Double_t centrality = 0;
301
302 if (fCentralityMethod.Length() > 0)
303 {
85bfac17 304 AliCentrality *centralityObj = 0;
305 if (fAOD)
306 centralityObj = fAOD->GetHeader()->GetCentralityP();
307 else if (fESD)
308 centralityObj = fESD->GetCentrality();
309
2a910c25 310 if (centralityObj)
311 {
312 centrality = centralityObj->GetCentralityPercentileUnchecked(fCentralityMethod);
a8583211 313 AliInfo(Form("Centrality is %f", centrality));
2a910c25 314 }
315 else
316 {
317 Printf("WARNING: Centrality object is 0");
318 centrality = -1;
319 }
320 }
321
85bfac17 322 // Support for ESD and AOD based analysis
323 AliVEvent* inputEvent = fAOD;
324 if (!inputEvent)
325 inputEvent = fESD;
326
327 TObject* mc = fArrayMC;
328 if (!mc)
329 mc = fMcEvent;
330
2a910c25 331 // count all events
332 fHistos->FillEvent(centrality, -1);
333
334 // Only consider MC events within the vtx-z region used also as cut on the reconstructed vertex
335 if (!fAnalyseUE->VertexSelection(fMcEvent, 0, fZVertex))
336 return;
85bfac17 337
338 Float_t zVtx = fMcEvent->GetPrimaryVertex()->GetZ();
c05ff6be 339 Float_t weight = 1;
340 if (fFillpT)
341 weight = -1;
2a910c25 342
343 // Get MC primaries
85bfac17 344 TObjArray* tracksMC = fAnalyseUE->GetAcceptedParticles(mc, 0, kTRUE, -1, kTRUE);
2a910c25 345
346 // (MC-true all particles)
347 // STEP 0
c05ff6be 348 fHistos->FillCorrelations(centrality, zVtx, AliUEHist::kCFStepAll, tracksMC, 0, weight);
2a910c25 349
350 // Trigger selection ************************************************
351 if (fAnalyseUE->TriggerSelection(fInputHandler))
352 {
c32a0ca9 353 // (MC-true all particles)
354 // STEP 1
355 if (!fReduceMemoryFootprint)
c05ff6be 356 fHistos->FillCorrelations(centrality, zVtx, AliUEHist::kCFStepTriggered, tracksMC, 0, weight);
c32a0ca9 357 else
358 fHistos->FillEvent(centrality, AliUEHist::kCFStepTriggered);
359
872dc651 360 if (!inputEvent) {
c32a0ca9 361 AliFatal("UNEXPECTED: inputEvent is 0. Trigger selection should have failed");
872dc651 362 return;
363 }
2a910c25 364
365 // Vertex selection *************************************************
85bfac17 366 if (fAnalyseUE->VertexSelection(inputEvent, fnTracksVertex, fZVertex))
2a910c25 367 {
368 // fill here for tracking efficiency
369 // loop over particle species
370
371 for (Int_t particleSpecies = 0; particleSpecies < 4; particleSpecies++)
372 {
85bfac17 373 TObjArray* primMCParticles = fAnalyseUE->GetAcceptedParticles(mc, 0x0, kTRUE, particleSpecies, kTRUE);
374 TObjArray* primRecoTracksMatched = fAnalyseUE->GetAcceptedParticles(inputEvent, mc, kTRUE, particleSpecies, kTRUE);
375 TObjArray* allRecoTracksMatched = fAnalyseUE->GetAcceptedParticles(inputEvent, mc, kFALSE, particleSpecies, kTRUE);
2a910c25 376
377 fHistos->FillTrackingEfficiency(primMCParticles, primRecoTracksMatched, allRecoTracksMatched, particleSpecies, centrality);
378
eed401dc 379// Printf("%d --> %d %d %d", particleSpecies, primMCParticles->GetEntries(), primRecoTracksMatched->GetEntries(), allRecoTracksMatched->GetEntries());
380
381 delete primMCParticles;
2a910c25 382 delete primRecoTracksMatched;
383 delete allRecoTracksMatched;
384 }
385
386 // (MC-true all particles)
387 // STEP 2
85bfac17 388 if (!fReduceMemoryFootprint)
c05ff6be 389 fHistos->FillCorrelations(centrality, zVtx, AliUEHist::kCFStepVertex, tracksMC, 0, weight);
c32a0ca9 390 else
391 fHistos->FillEvent(centrality, AliUEHist::kCFStepVertex);
2a910c25 392
393 // Get MC primaries that match reconstructed track
85bfac17 394 TObjArray* tracksRecoMatchedPrim = fAnalyseUE->GetAcceptedParticles(inputEvent, mc, kTRUE, -1, kTRUE);
2a910c25 395
396 // (RECO-matched (quantities from MC particle) primary particles)
397 // STEP 4
c05ff6be 398 fHistos->FillCorrelations(centrality, zVtx, AliUEHist::kCFStepTrackedOnlyPrim, tracksRecoMatchedPrim, 0, weight);
2a910c25 399
400 // Get MC primaries + secondaries that match reconstructed track
85bfac17 401 TObjArray* tracksRecoMatchedAll = fAnalyseUE->GetAcceptedParticles(inputEvent, mc, kFALSE, -1, kTRUE);
2a910c25 402
403 // (RECO-matched (quantities from MC particle) all particles)
404 // STEP 5
c05ff6be 405 fHistos->FillCorrelations(centrality, zVtx, AliUEHist::kCFStepTracked, tracksRecoMatchedAll, 0, weight);
2a910c25 406
407 // Get RECO tracks
85bfac17 408 TObjArray* tracks = fAnalyseUE->GetAcceptedParticles(inputEvent, 0, kTRUE, -1, kTRUE);
2a910c25 409
410 // (RECO all tracks)
411 // STEP 6
c05ff6be 412 fHistos->FillCorrelations(centrality, zVtx, AliUEHist::kCFStepReconstructed, tracks, 0, weight);
2a910c25 413
85bfac17 414 if (0 && !fReduceMemoryFootprint)
2a910c25 415 {
416 // make list of secondaries (matched with MC)
417 TObjArray* tracksRecoMatchedSecondaries = new TObjArray;
418 for (Int_t i=0; i<tracksRecoMatchedAll->GetEntries(); i++)
419 if (((AliAODMCParticle*)tracksRecoMatchedAll->At(i))->IsPhysicalPrimary() == kFALSE)
420 tracksRecoMatchedSecondaries->Add(tracksRecoMatchedAll->At(i));
421
422 // Study: Use only secondaries as trigger particles and plot the correlation vs. all particles; store in step 9
c05ff6be 423 fHistos->FillCorrelations(centrality, zVtx, AliUEHist::kCFStepBiasStudy2, tracksRecoMatchedSecondaries, tracksRecoMatchedAll, weight);
2a910c25 424
425 // Study: Use only primaries as trigger particles and plot the correlation vs. secondaries; store in step 8
c05ff6be 426 fHistos->FillCorrelations(centrality, zVtx, AliUEHist::kCFStepBiasStudy, tracksRecoMatchedPrim, tracksRecoMatchedSecondaries, weight);
2a910c25 427
428 // plot delta phi vs process id of secondaries
429 // trigger particles: primaries in 4 < pT < 10
430 // associated particles: secondaries in 1 < pT < 10
431
432 for (Int_t i=0; i<tracksRecoMatchedPrim->GetEntries(); i++)
433 {
434 AliVParticle* triggerParticle = (AliVParticle*) tracksRecoMatchedPrim->At(i);
435
436 if (triggerParticle->Pt() < 4 || triggerParticle->Pt() > 10)
437 continue;
438
439 for (Int_t j=0; j<tracksRecoMatchedSecondaries->GetEntries(); j++)
440 {
441 AliAODMCParticle* particle = (AliAODMCParticle*) tracksRecoMatchedSecondaries->At(j);
442
443 if (particle->Pt() < 1 || particle->Pt() > 10)
444 continue;
445
446 if (particle->Pt() > triggerParticle->Pt())
447 continue;
448
449 Double_t deltaPhi = triggerParticle->Phi() - particle->Phi();
450 if (deltaPhi > 1.5 * TMath::Pi())
451 deltaPhi -= TMath::TwoPi();
452 if (deltaPhi < -0.5 * TMath::Pi())
453 deltaPhi += TMath::TwoPi();
454
455 Int_t processID = fMcEvent->Stack()->Particle(particle->GetLabel())->GetUniqueID();
456
457 ((TH2F*) fListOfHistos->FindObject("processIDs"))->Fill(deltaPhi, processID);
458 }
459 }
460
461 delete tracksRecoMatchedSecondaries;
462 }
463
464 delete tracksRecoMatchedPrim;
465 delete tracksRecoMatchedAll;
466 delete tracks;
467 }
468 }
469
470 delete tracksMC;
e0331fd9 471}
472
473//____________________________________________________________________
474void AliAnalysisTaskPhiCorrelations::AnalyseDataMode()
475{
476
477 // Run the analysis on DATA or MC to get raw distributions
478
e0331fd9 479 if ( fDebug > 3 ) AliInfo( " Processing event in Data mode ..." );
e0331fd9 480
c066889a 481 ((TH1F*) fListOfHistos->FindObject("eventStat"))->Fill(0);
482
2a910c25 483 // skip not selected events here (the AOD is not updated for those)
484 if (!fInputHandler)
485 return;
486
85bfac17 487 if (!(fInputHandler->IsEventSelected() & (AliVEvent::kMB | AliVEvent::kUserDefined)))
2a910c25 488 return;
e0331fd9 489
2a910c25 490 Double_t centrality = 0;
491
c3294f09 492 AliCentrality *centralityObj = 0;
2a910c25 493 if (fCentralityMethod.Length() > 0)
494 {
85bfac17 495 if (fAOD)
496 centralityObj = fAOD->GetHeader()->GetCentralityP();
497 else if (fESD)
498 centralityObj = fESD->GetCentrality();
499
2a910c25 500 if (centralityObj)
501 centrality = centralityObj->GetCentralityPercentile(fCentralityMethod);
502 //centrality = centralityObj->GetCentralityPercentileUnchecked(fCentralityMethod);
503 else
504 centrality = -1;
a6d82f4e 505
506 if (fAOD)
507 {
508 // remove outliers
509 if (centrality == 0)
510 {
511 if (fAOD->GetVZEROData())
512 {
513 Float_t multV0 = 0;
514 for (Int_t i=0; i<64; i++)
515 multV0 += fAOD->GetVZEROData()->GetMultiplicity(i);
516 if (multV0 < 19500)
517 {
518 centrality = -1;
519 AliInfo("Rejecting event due to too small V0 multiplicity");
520 }
521 }
522 }
523 }
524
a8583211 525 AliInfo(Form("Centrality is %f", centrality));
2a910c25 526 }
527
85bfac17 528 // Support for ESD and AOD based analysis
529 AliVEvent* inputEvent = fAOD;
530 if (!inputEvent)
531 inputEvent = fESD;
532
533 fHistos->SetRunNumber(inputEvent->GetRunNumber());
534
2a910c25 535 // Fill the "event-counting-container", it is needed to get the number of events remaining after each event-selection cut
536 fHistos->FillEvent(centrality, AliUEHist::kCFStepAll);
537
e0331fd9 538 // Trigger selection ************************************************
539 if (!fAnalyseUE->TriggerSelection(fInputHandler)) return;
540
541 // Fill the "event-counting-container", it is needed to get the number of events remaining after each event-selection cut
2a910c25 542 fHistos->FillEvent(centrality, AliUEHist::kCFStepTriggered);
e0331fd9 543
544 // Vertex selection *************************************************
85bfac17 545 if(!fAnalyseUE->VertexSelection(inputEvent, fnTracksVertex, fZVertex)) return;
e0331fd9 546
547 // Fill the "event-counting-container", it is needed to get the number of events remaining after each event-selection cut
2a910c25 548 fHistos->FillEvent(centrality, AliUEHist::kCFStepVertex);
e0331fd9 549
c3294f09 550 // optimization
551 if (centrality < 0 && !fCompareCentralities)
2a910c25 552 return;
e0331fd9 553
85bfac17 554 TObjArray* tracks = fAnalyseUE->GetAcceptedParticles(inputEvent, 0, kTRUE, -1, kTRUE);
2a910c25 555 //Printf("Accepted %d tracks", tracks->GetEntries());
e0331fd9 556
85bfac17 557 const AliVVertex* vertex = inputEvent->GetPrimaryVertex();
2a910c25 558 Double_t zVtx = vertex->GetZ();
559
c05ff6be 560 Float_t weight = 1;
561 if (fFillpT)
562 weight = -1;
563
c3294f09 564 // fill two different centralities (syst study)
565 // the zvtx axis is used to distinguish the results of both centralities: configured centrality in zvtx = 0, SPD in zvtx = 2
566 if (fCompareCentralities)
567 zVtx = 0;
2a910c25 568
c3294f09 569 // Fill containers at STEP 6 (reconstructed)
570 if (centrality >= 0)
c066889a 571 {
c05ff6be 572 fHistos->FillCorrelations(centrality, zVtx, AliUEHist::kCFStepReconstructed, tracks, 0, weight);
c066889a 573 ((TH1F*) fListOfHistos->FindObject("eventStat"))->Fill(1);
574 }
c3294f09 575
1bba939a 576 // Two-track effect study
577 if (fTwoTrackEfficiencyStudy)
578 {
6840ec31 579 Float_t bSign = (fESD->GetMagneticField() > 0) ? 1 : -1;
c5c840c5 580 fHistos->TwoTrackEfficiency(tracks, 0, bSign);
1bba939a 581 }
582
c3294f09 583 // fill second time with SPD centrality
584 if (fCompareCentralities && centralityObj)
585 {
586 centrality = centralityObj->GetCentralityPercentile("CL1");
587 if (centrality >= 0)
c05ff6be 588 fHistos->FillCorrelations(centrality, 2, AliUEHist::kCFStepReconstructed, tracks, 0, weight);
c3294f09 589 }
590
eed401dc 591 if (fFillMixed)
e0331fd9 592 {
eed401dc 593 // event mixing
2a910c25 594
eed401dc 595 // 1. First get an event pool corresponding in mult (cent) and
596 // zvertex to the current event. Once initialized, the pool
597 // should contain nMix (reduced) events. This routine does not
598 // pre-scan the chain. The first several events of every chain
599 // will be skipped until the needed pools are filled to the
600 // specified depth. If the pool categories are not too rare, this
601 // should not be a problem. If they are rare, you could lose
602 // statistics.
603
604 // 2. Collect the whole pool's content of tracks into one TObjArray
605 // (bgTracks), which is effectively a single background super-event.
606
607 // 3. The reduced and bgTracks arrays must both be passed into
608 // FillCorrelations(). Also nMix should be passed in, so a weight
609 // of 1./nMix can be applied.
610
611 AliEventPool* pool = fPoolMgr->GetEventPool(centrality, zVtx);
612
613 if (!pool)
614 AliFatal(Form("No pool found for centrality = %f, zVtx = %f", centrality, zVtx));
615
616 //pool->SetDebug(1);
617
ac647b0f 618 if (pool->IsReady() || pool->NTracksInPool() > fMixingTracks / 10)
eed401dc 619 {
620
621 Int_t nMix = pool->GetCurrentNEvents();
a1c31636 622// cout << "nMix = " << nMix << " tracks in pool = " << pool->NTracksInPool() << endl;
c066889a 623
624 ((TH1F*) fListOfHistos->FindObject("eventStat"))->Fill(2);
625 ((TH1F*) fListOfHistos->FindObject("mixedDist"))->Fill(pool->NTracksInPool());
626 if (pool->IsReady())
627 ((TH1F*) fListOfHistos->FindObject("eventStat"))->Fill(3);
eed401dc 628
629 // Fill mixed-event histos here
c05ff6be 630 for (Int_t jMix=0; jMix<nMix; jMix++)
631 {
eed401dc 632 TObjArray* bgTracks = pool->GetEvent(jMix);
c5c840c5 633
634 if (fTwoTrackEfficiencyStudy)
635 {
636 Float_t bSign = (fESD->GetMagneticField() > 0) ? 1 : -1;
637 fHistos->TwoTrackEfficiency(tracks, bgTracks, bSign);
638 }
639
acc90d78 640 fHistosMixed->FillCorrelations(centrality, zVtx, AliUEHist::kCFStepReconstructed, tracks, bgTracks, 1.0 / nMix, (jMix == 0));
eed401dc 641 }
e0331fd9 642 }
eed401dc 643
a1c31636 644 // create a list of reduced objects (to reduce memory consumption) and give ownership to event pool
645 TObjArray* tracksClone = new TObjArray;
eed401dc 646 tracksClone->SetOwner(kTRUE);
647
a1c31636 648 for (Int_t i=0; i<tracks->GetEntries(); i++)
649 {
650 AliVParticle* particle = (AliVParticle*) tracks->At(i);
651 tracksClone->Add(new AliDPhiBasicParticle(particle->Eta(), particle->Phi(), particle->Pt(), particle->Charge()));
652 }
653
eed401dc 654 pool->UpdatePool(tracksClone);
655 //pool->PrintInfo();
e0331fd9 656 }
2a910c25 657
e0331fd9 658 delete tracks;
e0331fd9 659}
660
661//____________________________________________________________________
662void AliAnalysisTaskPhiCorrelations::Initialize()
663{
664 // input handler
665 fInputHandler = (AliInputEventHandler*)
666 ((AliAnalysisManager::GetAnalysisManager())->GetInputEventHandler());
667 // MC handler
668 fMcHandler = dynamic_cast<AliMCEventHandler*> (AliAnalysisManager::GetAnalysisManager()->GetMCtruthEventHandler());
669}