PWGCF/Correlations/DPhi/AliAnalysisTaskPhiCorrelations.cxx

   1 /**************************************************************************
   2  * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
   3  *                                                                        *
   4  * Author: The ALICE Off-line Project.                                    *
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  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
  32 #include "AliAnalysisManager.h"
  33 #include "AliAODHandler.h"
  34 #include "AliAODInputHandler.h"
  35 #include "AliAODMCParticle.h"
  36 #include "AliInputEventHandler.h"
  37 #include "AliLog.h"
  38 #include "AliMCEventHandler.h"
  39 #include "AliVParticle.h"
  40 #include "AliCFContainer.h"
  41
  42 #include "AliESDEvent.h"
  43 #include "AliESDInputHandler.h"
  44 #include "AliMultiplicity.h"
  45 #include "AliCentrality.h"
  46 #include "AliStack.h"
  47 #include "AliAODMCHeader.h"
  48
  49 #include "AliEventPoolManager.h"
  50
  51
  52 ////////////////////////////////////////////////////////////////////////
  53 //
  54 // Analysis class for azimuthal correlation studies
  55 // Based on the UE task from Sara Vallero and Jan Fiete
  56 //
  57 // This class needs input AODs.
  58 // The output is a list of analysis-specific containers.
  59 //
  60 // The AOD can be either connected to the InputEventHandler
  61 // for a chain of AOD files
  62 // or
  63 // to the OutputEventHandler
  64 // for a chain of ESD files,
  65 // in this case the class should be in the train after the jet-finder
  66 //
  67 //    Authors:
  68 //    Jan Fiete Grosse-Oetringhaus
  69 //
  70 ////////////////////////////////////////////////////////////////////////
  71
  72
  73 ClassImp( AliAnalysisTaskPhiCorrelations )
  74 ClassImp( AliDPhiBasicParticle )
  75
  76 //____________________________________________________________________
  77 AliAnalysisTaskPhiCorrelations:: AliAnalysisTaskPhiCorrelations(const char* name):
  78 AliAnalysisTask(name,""),
  79 // general configuration
  80 fDebug(0),
  81 fMode(0),
  82 fReduceMemoryFootprint(kFALSE),
  83 fFillMixed(kTRUE),
  84 fMixingTracks(50000),
  85 fCompareCentralities(kFALSE),
  86 fTwoTrackEfficiencyStudy(kFALSE),
  87 fTwoTrackEfficiencyCut(kFALSE),
  88 fUseVtxAxis(kFALSE),
  89 fSkipTrigger(kFALSE),
  90 // pointers to UE classes
  91 fAnalyseUE(0x0),
  92 fHistos(0x0),
  93 fHistosMixed(0),
  94 fkTrackingEfficiency(0x0),
  95 // handlers and events
  96 fAOD(0x0),
  97 fESD(0x0),
  98 fArrayMC(0x0),
  99 fInputHandler(0x0),
 100 fMcEvent(0x0),
 101 fMcHandler(0x0),
 102 fPoolMgr(0x0),
 103 // histogram settings
 104 fListOfHistos(0x0),
 105 // event QA
 106 fnTracksVertex(1),  // QA tracks pointing to principal vertex (= 3 default)
 107 fZVertex(7.),
 108 fCentralityMethod("V0M"),
 109 // track cuts
 110 fTrackEtaCut(0.8),
 111 fPtMin(0.5),
 112 fFilterBit(0xFF),
 113 fSelectBit(0),
 114 fUseChargeHadrons(kFALSE),
 115 fSelectCharge(0),
 116 fTriggerRestrictEta(-1),
 117 fEtaOrdering(kFALSE),
 118 fCutConversions(kFALSE),
 119 fCutResonances(kFALSE),
 120 fFillpT(kFALSE)
 121 {
 122   // Default constructor
 123   // Define input and output slots here
 124   // Input slot #0 works with a TChain
 125   DefineInput(0, TChain::Class());
 126   // Output slot #0 writes into a TList container
 127   DefineOutput(0, TList::Class());
 128 }
 129
 130 AliAnalysisTaskPhiCorrelations::~AliAnalysisTaskPhiCorrelations()
 131 {
 132   // destructor
 133
 134   if (fListOfHistos  && !AliAnalysisManager::GetAnalysisManager()->IsProofMode())
 135     delete fListOfHistos;
 136 }
 137
 138 //____________________________________________________________________
 139 void AliAnalysisTaskPhiCorrelations::ConnectInputData(Option_t* /*option*/)
 140 {
 141
 142   // Connect the input data
 143   if (fDebug > 1) AliInfo("ConnectInputData() ");
 144
 145   // Since AODs can either be connected to the InputEventHandler
 146   // or to the OutputEventHandler ( the AOD is created by a previus task in the train )
 147   // we need to get the pointer to the AODEvent correctly.
 148
 149   // Delta AODs are also accepted.
 150
 151   TObject* handler = AliAnalysisManager::GetAnalysisManager()->GetInputEventHandler();
 152
 153   if( handler && handler->InheritsFrom("AliAODInputHandler") )
 154   { // input AOD
 155     fAOD = ((AliAODInputHandler*)handler)->GetEvent();
 156     if (fDebug > 1) AliInfo(" ==== Tracks and Jets from AliAODInputHandler");
 157   }
 158   else
 159   {  //output AOD
 160     handler = AliAnalysisManager::GetAnalysisManager()->GetOutputEventHandler();
 161     if (handler && handler->InheritsFrom("AliAODHandler") )
 162     {
 163       fAOD = ((AliAODHandler*)handler)->GetAOD();
 164       if (fDebug > 1) AliInfo(" ==== Tracks and Jets from AliAODHandler");
 165     }
 166     else
 167     {  // no AOD
 168       AliWarning("I can't get any AOD Event Handler");
 169     }
 170   }
 171
 172   if (handler && handler->InheritsFrom("AliESDInputHandler") )
 173   { // input ESD
 174     // pointer received per event in ::Exec
 175     if (fDebug > 1) AliInfo(" ==== Tracks and Jets from AliESDInputHandler");
 176   }
 177
 178   // Initialize common pointers
 179   Initialize();
 180 }
 181
 182 //____________________________________________________________________
 183 void  AliAnalysisTaskPhiCorrelations::CreateOutputObjects()
 184 {
 185   // Create the output container
 186
 187   if (fDebug > 1) AliInfo("CreateOutputObjects()");
 188
 189   // Initialize class with main algorithms, event and track selection.
 190   fAnalyseUE = new AliAnalyseLeadingTrackUE();
 191   fAnalyseUE->SetParticleSelectionCriteria(fFilterBit, fUseChargeHadrons, fTrackEtaCut, fPtMin);
 192   fAnalyseUE->SetDebug(fDebug);
 193   fAnalyseUE->DefineESDCuts(fFilterBit);
 194
 195   // Initialize output list of containers
 196   if (fListOfHistos != NULL){
 197         delete fListOfHistos;
 198         fListOfHistos = NULL;
 199         }
 200   if (!fListOfHistos){
 201         fListOfHistos = new TList();
 202         fListOfHistos->SetOwner(kTRUE);
 203         }
 204
 205   // Initialize class to handle histograms
 206   const char* histType = "4";
 207   if (fUseVtxAxis)
 208     histType = "5";
 209   fHistos = new AliUEHistograms("AliUEHistogramsSame", histType);
 210   fHistosMixed = new AliUEHistograms("AliUEHistogramsMixed", histType);
 211
 212   fHistos->SetSelectCharge(fSelectCharge);
 213   fHistosMixed->SetSelectCharge(fSelectCharge);
 214
 215   fHistos->SetTriggerRestrictEta(fTriggerRestrictEta);
 216   fHistosMixed->SetTriggerRestrictEta(fTriggerRestrictEta);
 217
 218   fHistos->SetEtaOrdering(fEtaOrdering);
 219   fHistosMixed->SetEtaOrdering(fEtaOrdering);
 220
 221   fHistos->SetPairCuts(fCutConversions, fCutResonances);
 222   fHistosMixed->SetPairCuts(fCutConversions, fCutResonances);
 223
 224   // add histograms to list
 225   fListOfHistos->Add(fHistos);
 226   fListOfHistos->Add(fHistosMixed);
 227
 228   fListOfHistos->Add(new TH2F("trackletsVsV0Cent", ";L1 clusters;v0 centrality", 100, -0.5, 9999.5, 101, 0, 101));
 229   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));
 230   fListOfHistos->Add(new TH1F("eventStat", ";;events", 4, -0.5, 3.5));
 231   fListOfHistos->Add(new TH2F("mixedDist", ";centrality;tracks;events", 101, 0, 101, 200, 0, fMixingTracks * 1.5));
 232   fListOfHistos->Add(new TH1F("pids", ";pdg;tracks", 2001, -1000.5, 1000.5));
 233
 234   PostData(0,fListOfHistos);
 235
 236   // Add task configuration to output list
 237   AddSettingsTree();
 238
 239   // event mixing
 240   Int_t trackDepth = fMixingTracks;
 241   Int_t poolsize   = 1000;  // Maximum number of events, ignored in the present implemented of AliEventPool
 242
 243   Int_t nCentralityBins  = fHistos->GetUEHist(2)->GetEventHist()->GetNBins(1);
 244   Double_t* centralityBins = (Double_t*) fHistos->GetUEHist(2)->GetEventHist()->GetAxis(1, 0)->GetXbins()->GetArray();
 245
 246   Int_t nZvtxBins  = 7+1+7;
 247   // bins for second buffer are shifted by 100 cm
 248   Double_t vertexBins[] = { -7, -5, -3, -1, 1, 3, 5, 7, 93, 95, 97, 99, 101, 103, 105, 107 };
 249   Double_t* zvtxbin = vertexBins;
 250
 251   if (fHistos->GetUEHist(2)->GetEventHist()->GetNVar() > 2)
 252   {
 253     nZvtxBins = fHistos->GetUEHist(2)->GetEventHist()->GetNBins(2);
 254     zvtxbin = (Double_t*) fHistos->GetUEHist(2)->GetEventHist()->GetAxis(2, 0)->GetXbins()->GetArray();
 255   }
 256
 257   fPoolMgr = new AliEventPoolManager(poolsize, trackDepth, nCentralityBins, centralityBins, nZvtxBins, zvtxbin);
 258 }
 259
 260 //____________________________________________________________________
 261 void  AliAnalysisTaskPhiCorrelations::Exec(Option_t */*option*/)
 262 {
 263   // receive ESD pointer if we are not running AOD analysis
 264   if (!fAOD)
 265   {
 266     AliVEventHandler* handler = AliAnalysisManager::GetAnalysisManager()->GetInputEventHandler();
 267     if (handler && handler->InheritsFrom("AliESDInputHandler"))
 268       fESD = ((AliESDInputHandler*)handler)->GetEvent();
 269   }
 270
 271   if (fMode)
 272   {
 273     // correction mode
 274
 275     if (fMcHandler)
 276       fMcEvent = fMcHandler->MCEvent();
 277
 278     if (fAOD)
 279     {
 280       // array of MC particles
 281       fArrayMC = dynamic_cast<TClonesArray*>(fAOD->FindListObject(AliAODMCParticle::StdBranchName()));
 282       if (!fArrayMC)
 283         AliFatal("No array of MC particles found !!!");
 284     }
 285
 286     AnalyseCorrectionMode();
 287   }
 288   else AnalyseDataMode();
 289 }
 290
 291 /******************** ANALYSIS METHODS *****************************/
 292
 293 //____________________________________________________________________
 294 void  AliAnalysisTaskPhiCorrelations::AddSettingsTree()
 295 {
 296   //Write settings to output list
 297   TTree *settingsTree   = new TTree("UEAnalysisSettings","Analysis Settings in UE estimation");
 298   settingsTree->Branch("fnTracksVertex", &fnTracksVertex,"nTracksVertex/I");
 299   settingsTree->Branch("fZVertex", &fZVertex,"ZVertex/D");
 300   //settingsTree->Branch("fCentralityMethod", fCentralityMethod.Data(),"CentralityMethod/C");
 301   settingsTree->Branch("fTrackEtaCut", &fTrackEtaCut, "TrackEtaCut/D");
 302   settingsTree->Branch("fPtMin", &fPtMin, "PtMin/D");
 303   settingsTree->Branch("fFilterBit", &fFilterBit,"FilterBit/I");
 304   settingsTree->Branch("fSelectBit", &fSelectBit,"EventSelectionBit/I");
 305   settingsTree->Branch("fUseChargeHadrons", &fUseChargeHadrons,"UseChHadrons/O");
 306   settingsTree->Branch("fSelectCharge", &fSelectCharge,"SelectCharge/I");
 307   settingsTree->Branch("fTriggerRestrictEta", &fTriggerRestrictEta,"TriggerRestrictEta/D");
 308   settingsTree->Branch("fEtaOrdering", &fEtaOrdering,"EtaOrdering/O");
 309   settingsTree->Branch("fCutConversions", &fCutConversions,"CutConversions/O");
 310   settingsTree->Branch("fCutResonances", &fCutResonances,"CutResonances/O");
 311   settingsTree->Branch("fFillpT", &fFillpT,"FillpT/O");
 312   settingsTree->Branch("fkTrackingEfficiency", "TH1D", &fkTrackingEfficiency);
 313   settingsTree->Branch("fMixingTracks", &fMixingTracks,"MixingTracks/I");
 314   settingsTree->Branch("fSkipTrigger", &fSkipTrigger,"SkipTrigger/O");
 315
 316   settingsTree->Fill();
 317   fListOfHistos->Add(settingsTree);
 318 }
 319
 320 //____________________________________________________________________
 321 void  AliAnalysisTaskPhiCorrelations::AnalyseCorrectionMode()
 322 {
 323   // Run the analysis on MC to get the correction maps
 324   //
 325
 326   if ( fDebug > 3 ) AliInfo( " Processing event in Corrections mode ..." );
 327
 328   Double_t centrality = 0;
 329
 330   if (fCentralityMethod.Length() > 0)
 331   {
 332     AliCentrality *centralityObj = 0;
 333     if (fAOD)
 334       centralityObj = fAOD->GetHeader()->GetCentralityP();
 335     else if (fESD)
 336       centralityObj = fESD->GetCentrality();
 337
 338     if (centralityObj)
 339     {
 340       centrality = centralityObj->GetCentralityPercentileUnchecked(fCentralityMethod);
 341       AliInfo(Form("Centrality is %f", centrality));
 342     }
 343     else
 344     {
 345       Printf("WARNING: Centrality object is 0");
 346       centrality = -1;
 347      }
 348   }
 349
 350   // Support for ESD and AOD based analysis
 351   AliVEvent* inputEvent = fAOD;
 352   if (!inputEvent)
 353     inputEvent = fESD;
 354
 355   TObject* mc = fArrayMC;
 356   if (!mc)
 357     mc = fMcEvent;
 358
 359   // count all events
 360   fHistos->FillEvent(centrality, -1);
 361
 362   // Only consider MC events within the vtx-z region used also as cut on the reconstructed vertex
 363   TObject* vertexSupplier = fMcEvent;
 364   if (fAOD) // AOD
 365     vertexSupplier = fAOD->FindListObject(AliAODMCHeader::StdBranchName());
 366
 367   if (!fAnalyseUE->VertexSelection(vertexSupplier, 0, fZVertex))
 368     return;
 369
 370   Float_t zVtx = 0;
 371   if (fAOD)
 372     zVtx = ((AliAODMCHeader*) vertexSupplier)->GetVtxZ();
 373   else
 374     zVtx = fMcEvent->GetPrimaryVertex()->GetZ();
 375   Float_t weight = 1;
 376   if (fFillpT)
 377     weight = -1;
 378
 379   // Get MC primaries
 380   TObjArray* tracksMC = fAnalyseUE->GetAcceptedParticles(mc, 0, kTRUE, -1, kTRUE);
 381
 382   if (fAOD)
 383   {
 384     for (Int_t i=0; i<fArrayMC->GetEntriesFast(); i++)
 385       ((TH1F*) fListOfHistos->FindObject("pids"))->Fill(((AliAODMCParticle*) fArrayMC->At(i))->PdgCode());
 386   }
 387   else
 388   {
 389     for (Int_t i=0; i<fMcEvent->GetNumberOfTracks(); i++)
 390       ((TH1F*) fListOfHistos->FindObject("pids"))->Fill(fMcEvent->GetTrack(i)->PdgCode());
 391   }
 392
 393   // (MC-true all particles)
 394   // STEP 0
 395   fHistos->FillCorrelations(centrality, zVtx, AliUEHist::kCFStepAll, tracksMC, 0, weight);
 396
 397   // mixed event
 398   if (fFillMixed)
 399   {
 400     AliEventPool* pool = fPoolMgr->GetEventPool(centrality, zVtx);
 401     //pool->PrintInfo();
 402     if (pool->IsReady() || pool->NTracksInPool() > fMixingTracks / 10 || pool->GetCurrentNEvents() >= 5)
 403       for (Int_t jMix=0; jMix<pool->GetCurrentNEvents(); jMix++)
 404         fHistosMixed->FillCorrelations(centrality, zVtx, AliUEHist::kCFStepAll, tracksMC, pool->GetEvent(jMix), 1.0 / pool->GetCurrentNEvents(), (jMix == 0));
 405     pool->UpdatePool(CloneAndReduceTrackList(tracksMC));
 406   }
 407
 408 //   Printf("trigger: %d", ((AliInputEventHandler*)fInputHandler)->IsEventSelected());
 409
 410   // Trigger selection ************************************************
 411   if (fSkipTrigger || fAnalyseUE->TriggerSelection(fInputHandler))
 412   {
 413     // (MC-true all particles)
 414     // STEP 1
 415     if (!fReduceMemoryFootprint)
 416       fHistos->FillCorrelations(centrality, zVtx, AliUEHist::kCFStepTriggered, tracksMC, 0, weight);
 417     else
 418       fHistos->FillEvent(centrality, AliUEHist::kCFStepTriggered);
 419
 420     if (!inputEvent) {
 421       AliFatal("UNEXPECTED: inputEvent is 0. Trigger selection should have failed");
 422       return;
 423     }
 424
 425     // Vertex selection *************************************************
 426     if (fAnalyseUE->VertexSelection(inputEvent, fnTracksVertex, fZVertex))
 427     {
 428       // fill here for tracking efficiency
 429       // loop over particle species
 430
 431       for (Int_t particleSpecies = 0; particleSpecies < 4; particleSpecies++)
 432       {
 433         TObjArray* primMCParticles = fAnalyseUE->GetAcceptedParticles(mc, 0x0, kTRUE, particleSpecies, kTRUE);
 434         TObjArray* primRecoTracksMatched = fAnalyseUE->GetAcceptedParticles(inputEvent, mc, kTRUE, particleSpecies, kTRUE);
 435         TObjArray* allRecoTracksMatched = fAnalyseUE->GetAcceptedParticles(inputEvent, mc, kFALSE, particleSpecies, kTRUE);
 436
 437         fHistos->FillTrackingEfficiency(primMCParticles, primRecoTracksMatched, allRecoTracksMatched, particleSpecies, centrality);
 438
 439 //      Printf("%d --> %d %d %d", particleSpecies, primMCParticles->GetEntries(), primRecoTracksMatched->GetEntries(), allRecoTracksMatched->GetEntries());
 440
 441         delete primMCParticles;
 442         delete primRecoTracksMatched;
 443         delete allRecoTracksMatched;
 444       }
 445
 446       // (MC-true all particles)
 447       // STEP 2
 448       if (!fReduceMemoryFootprint)
 449         fHistos->FillCorrelations(centrality, zVtx, AliUEHist::kCFStepVertex, tracksMC, 0, weight);
 450       else
 451         fHistos->FillEvent(centrality, AliUEHist::kCFStepVertex);
 452
 453       // Get MC primaries that match reconstructed track
 454       TObjArray* tracksRecoMatchedPrim = fAnalyseUE->GetAcceptedParticles(inputEvent, mc, kTRUE, -1, kTRUE);
 455
 456       // (RECO-matched (quantities from MC particle) primary particles)
 457       // STEP 4
 458       fHistos->FillCorrelations(centrality, zVtx, AliUEHist::kCFStepTrackedOnlyPrim, tracksRecoMatchedPrim, 0, weight);
 459
 460       // Get MC primaries + secondaries that match reconstructed track
 461       TObjArray* tracksRecoMatchedAll = fAnalyseUE->GetAcceptedParticles(inputEvent, mc, kFALSE, -1, kTRUE);
 462
 463       // (RECO-matched (quantities from MC particle) all particles)
 464       // STEP 5
 465       fHistos->FillCorrelations(centrality, zVtx, AliUEHist::kCFStepTracked, tracksRecoMatchedAll, 0, weight);
 466
 467       // Get RECO tracks
 468       TObjArray* tracks = fAnalyseUE->GetAcceptedParticles(inputEvent, 0, kTRUE, -1, kTRUE);
 469
 470       // (RECO all tracks)
 471       // STEP 6
 472       fHistos->FillCorrelations(centrality, zVtx, AliUEHist::kCFStepReconstructed, tracks, 0, weight);
 473
 474       // mixed event
 475       if (fFillMixed)
 476       {
 477         AliEventPool* pool2 = fPoolMgr->GetEventPool(centrality, zVtx + 100);
 478         //pool2->PrintInfo();
 479         if (pool2->IsReady() || pool2->NTracksInPool() > fMixingTracks / 10 || pool2->GetCurrentNEvents() >= 5)
 480           for (Int_t jMix=0; jMix<pool2->GetCurrentNEvents(); jMix++)
 481             fHistosMixed->FillCorrelations(centrality, zVtx, AliUEHist::kCFStepReconstructed, tracks, pool2->GetEvent(jMix), 1.0 / pool2->GetCurrentNEvents(), (jMix == 0));
 482         pool2->UpdatePool(CloneAndReduceTrackList(tracks));
 483       }
 484
 485       if (0 && !fReduceMemoryFootprint)
 486       {
 487         // make list of secondaries (matched with MC)
 488         TObjArray* tracksRecoMatchedSecondaries = new TObjArray;
 489         for (Int_t i=0; i<tracksRecoMatchedAll->GetEntriesFast(); i++)
 490           if (((AliAODMCParticle*)tracksRecoMatchedAll->At(i))->IsPhysicalPrimary() == kFALSE)
 491             tracksRecoMatchedSecondaries->Add(tracksRecoMatchedAll->At(i));
 492
 493         // Study: Use only secondaries as trigger particles and plot the correlation vs. all particles; store in step 9
 494         fHistos->FillCorrelations(centrality, zVtx, AliUEHist::kCFStepBiasStudy2, tracksRecoMatchedSecondaries, tracksRecoMatchedAll, weight);
 495
 496         // Study: Use only primaries as trigger particles and plot the correlation vs. secondaries; store in step 8
 497         fHistos->FillCorrelations(centrality, zVtx, AliUEHist::kCFStepBiasStudy, tracksRecoMatchedPrim, tracksRecoMatchedSecondaries, weight);
 498
 499         // plot delta phi vs process id of secondaries
 500         // trigger particles: primaries in 4 < pT < 10
 501         // associated particles: secondaries in 1 < pT < 10
 502
 503         for (Int_t i=0; i<tracksRecoMatchedPrim->GetEntriesFast(); i++)
 504         {
 505           AliVParticle* triggerParticle = (AliVParticle*) tracksRecoMatchedPrim->At(i);
 506
 507           if (triggerParticle->Pt() < 4 || triggerParticle->Pt() > 10)
 508             continue;
 509
 510           for (Int_t j=0; j<tracksRecoMatchedSecondaries->GetEntriesFast(); j++)
 511           {
 512             AliAODMCParticle* particle = (AliAODMCParticle*) tracksRecoMatchedSecondaries->At(j);
 513
 514             if (particle->Pt() < 1 || particle->Pt() > 10)
 515               continue;
 516
 517             if (particle->Pt() > triggerParticle->Pt())
 518               continue;
 519
 520             Double_t deltaPhi = triggerParticle->Phi() - particle->Phi();
 521             if (deltaPhi > 1.5 * TMath::Pi())
 522               deltaPhi -= TMath::TwoPi();
 523             if (deltaPhi < -0.5 * TMath::Pi())
 524               deltaPhi += TMath::TwoPi();
 525
 526             Int_t processID = fMcEvent->Stack()->Particle(particle->GetLabel())->GetUniqueID();
 527
 528             ((TH2F*) fListOfHistos->FindObject("processIDs"))->Fill(deltaPhi, processID);
 529           }
 530         }
 531
 532         delete tracksRecoMatchedSecondaries;
 533       }
 534
 535       delete tracksRecoMatchedPrim;
 536       delete tracksRecoMatchedAll;
 537       delete tracks;
 538     }
 539   }
 540
 541   delete tracksMC;
 542 }
 543
 544 //____________________________________________________________________
 545 void  AliAnalysisTaskPhiCorrelations::AnalyseDataMode()
 546 {
 547
 548   // Run the analysis on DATA or MC to get raw distributions
 549
 550   if ( fDebug > 3 ) AliInfo( " Processing event in Data mode ..." );
 551
 552   ((TH1F*) fListOfHistos->FindObject("eventStat"))->Fill(0);
 553
 554   // skip not selected events here (the AOD is not updated for those)
 555   if (!fInputHandler)
 556     return;
 557
 558   if (!(fInputHandler->IsEventSelected() & (AliVEvent::kMB | AliVEvent::kUserDefined)))
 559     return;
 560
 561   Double_t centrality = 0;
 562
 563   AliCentrality *centralityObj = 0;
 564   if (fCentralityMethod.Length() > 0)
 565   {
 566     if (fAOD)
 567       centralityObj = fAOD->GetHeader()->GetCentralityP();
 568     else if (fESD)
 569       centralityObj = fESD->GetCentrality();
 570
 571     if (centralityObj)
 572       centrality = centralityObj->GetCentralityPercentile(fCentralityMethod);
 573       //centrality = centralityObj->GetCentralityPercentileUnchecked(fCentralityMethod);
 574     else
 575       centrality = -1;
 576
 577     if (fAOD)
 578     {
 579       // remove outliers
 580       if (centrality == 0)
 581       {
 582         if (fAOD->GetVZEROData())
 583         {
 584           Float_t multV0 = 0;
 585           for (Int_t i=0; i<64; i++)
 586             multV0 += fAOD->GetVZEROData()->GetMultiplicity(i);
 587           if (multV0 < 19500)
 588           {
 589             centrality = -1;
 590             AliInfo("Rejecting event due to too small V0 multiplicity");
 591           }
 592         }
 593       }
 594     }
 595
 596     AliInfo(Form("Centrality is %f", centrality));
 597   }
 598
 599   // Support for ESD and AOD based analysis
 600   AliVEvent* inputEvent = fAOD;
 601   if (!inputEvent)
 602     inputEvent = fESD;
 603
 604   Float_t bSign = (inputEvent->GetMagneticField() > 0) ? 1 : -1;
 605
 606   fHistos->SetRunNumber(inputEvent->GetRunNumber());
 607
 608   // Fill the "event-counting-container", it is needed to get the number of events remaining after each event-selection cut
 609   fHistos->FillEvent(centrality, AliUEHist::kCFStepAll);
 610
 611   // Trigger selection ************************************************
 612   if (!fAnalyseUE->TriggerSelection(fInputHandler)) return;
 613
 614   // Fill the "event-counting-container", it is needed to get the number of events remaining after each event-selection cut
 615   fHistos->FillEvent(centrality, AliUEHist::kCFStepTriggered);
 616
 617   // Vertex selection *************************************************
 618   if(!fAnalyseUE->VertexSelection(inputEvent, fnTracksVertex, fZVertex)) return;
 619
 620   // Fill the "event-counting-container", it is needed to get the number of events remaining after each event-selection cut
 621   fHistos->FillEvent(centrality, AliUEHist::kCFStepVertex);
 622
 623   // optimization
 624   if (centrality < 0 && !fCompareCentralities)
 625     return;
 626
 627   TObjArray* tracks = fAnalyseUE->GetAcceptedParticles(inputEvent, 0, kTRUE, -1, kTRUE);
 628   // create a list of reduced objects. This speeds up processing and reduces memory consumption for the event pool
 629   TObjArray* tracksClone = CloneAndReduceTrackList(tracks);
 630   delete tracks;
 631
 632   //Printf("Accepted %d tracks", tracks->GetEntries());
 633
 634   const AliVVertex* vertex = inputEvent->GetPrimaryVertex();
 635   Double_t zVtx = vertex->GetZ();
 636
 637   Float_t weight = 1;
 638   if (fFillpT)
 639     weight = -1;
 640
 641   // fill two different centralities (syst study)
 642   // the zvtx axis is used to distinguish the results of both centralities: configured centrality in zvtx = 0, SPD in zvtx = 2
 643   if (fCompareCentralities)
 644     zVtx = 0;
 645
 646   // Fill containers at STEP 6 (reconstructed)
 647   if (centrality >= 0)
 648   {
 649     fHistos->FillCorrelations(centrality, zVtx, AliUEHist::kCFStepReconstructed, tracksClone, 0, weight);
 650     ((TH1F*) fListOfHistos->FindObject("eventStat"))->Fill(1);
 651
 652     if (fTwoTrackEfficiencyCut)
 653       fHistos->FillCorrelations(centrality, zVtx, AliUEHist::kCFStepBiasStudy, tracksClone, 0, weight, kTRUE, kTRUE, bSign);
 654   }
 655
 656   // fill second time with SPD centrality
 657   if (fCompareCentralities && centralityObj)
 658   {
 659     centrality = centralityObj->GetCentralityPercentile("CL1");
 660     if (centrality >= 0)
 661       fHistos->FillCorrelations(centrality, 2, AliUEHist::kCFStepReconstructed, tracksClone, 0, weight);
 662   }
 663
 664   if (fFillMixed)
 665   {
 666     // event mixing
 667
 668     // 1. First get an event pool corresponding in mult (cent) and
 669     //    zvertex to the current event. Once initialized, the pool
 670     //    should contain nMix (reduced) events. This routine does not
 671     //    pre-scan the chain. The first several events of every chain
 672     //    will be skipped until the needed pools are filled to the
 673     //    specified depth. If the pool categories are not too rare, this
 674     //    should not be a problem. If they are rare, you could lose
 675     //    statistics.
 676
 677     // 2. Collect the whole pool's content of tracks into one TObjArray
 678     //    (bgTracks), which is effectively a single background super-event.
 679
 680     // 3. The reduced and bgTracks arrays must both be passed into
 681     //    FillCorrelations(). Also nMix should be passed in, so a weight
 682     //    of 1./nMix can be applied.
 683
 684     AliEventPool* pool = fPoolMgr->GetEventPool(centrality, zVtx);
 685
 686     if (!pool)
 687       AliFatal(Form("No pool found for centrality = %f, zVtx = %f", centrality, zVtx));
 688
 689     //pool->SetDebug(1);
 690
 691     if (pool->IsReady() || pool->NTracksInPool() > fMixingTracks / 10 || pool->GetCurrentNEvents() >= 5)
 692     {
 693
 694       Int_t nMix = pool->GetCurrentNEvents();
 695 //       cout << "nMix = " << nMix << " tracks in pool = " << pool->NTracksInPool() << endl;
 696
 697       ((TH1F*) fListOfHistos->FindObject("eventStat"))->Fill(2);
 698       ((TH2F*) fListOfHistos->FindObject("mixedDist"))->Fill(centrality, pool->NTracksInPool());
 699       if (pool->IsReady())
 700         ((TH1F*) fListOfHistos->FindObject("eventStat"))->Fill(3);
 701
 702       // Fill mixed-event histos here
 703       for (Int_t jMix=0; jMix<nMix; jMix++)
 704       {
 705         TObjArray* bgTracks = pool->GetEvent(jMix);
 706
 707         fHistosMixed->FillCorrelations(centrality, zVtx, AliUEHist::kCFStepReconstructed, tracksClone, bgTracks, 1.0 / nMix, (jMix == 0));
 708
 709         if (fTwoTrackEfficiencyCut)
 710           fHistosMixed->FillCorrelations(centrality, zVtx, AliUEHist::kCFStepBiasStudy, tracksClone, bgTracks, 1.0 / nMix, (jMix == 0), kTRUE, bSign);
 711       }
 712     }
 713
 714     // ownership is with the pool now
 715     pool->UpdatePool(tracksClone);
 716     //pool->PrintInfo();
 717   }
 718   else
 719     delete tracksClone;
 720 }
 721
 722 TObjArray* AliAnalysisTaskPhiCorrelations::CloneAndReduceTrackList(TObjArray* tracks)
 723 {
 724   // clones a track list by using AliDPhiBasicParticle which uses much less memory (used for event mixing)
 725
 726   TObjArray* tracksClone = new TObjArray;
 727   tracksClone->SetOwner(kTRUE);
 728
 729   for (Int_t i=0; i<tracks->GetEntriesFast(); i++)
 730   {
 731     AliVParticle* particle = (AliVParticle*) tracks->At(i);
 732     tracksClone->Add(new AliDPhiBasicParticle(particle->Eta(), particle->Phi(), particle->Pt(), particle->Charge()));
 733   }
 734
 735   return tracksClone;
 736 }
 737
 738 //____________________________________________________________________
 739 void  AliAnalysisTaskPhiCorrelations::Initialize()
 740 {
 741   // input handler
 742   fInputHandler = (AliInputEventHandler*)
 743          ((AliAnalysisManager::GetAnalysisManager())->GetInputEventHandler());
 744   // MC handler
 745   fMcHandler = dynamic_cast<AliMCEventHandler*> (AliAnalysisManager::GetAnalysisManager()->GetMCtruthEventHandler());
 746 }