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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  13  * provided "as is" without express or implied warranty.                  *
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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(0),
  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 fOnlyOneEtaSide(0),
 112 fPtMin(0.5),
 113 fFilterBit(0xFF),
 114 fSelectBit(0),
 115 fUseChargeHadrons(kFALSE),
 116 fSelectCharge(0),
 117 fTriggerRestrictEta(-1),
 118 fEtaOrdering(kFALSE),
 119 fCutConversions(kFALSE),
 120 fCutResonances(kFALSE),
 121 fFillOnlyStep0(kFALSE),
 122 fSkipStep6(kFALSE),
 123 fRejectCentralityOutliers(kFALSE),
 124 fFillpT(kFALSE)
 125 {
 126   // Default constructor
 127   // Define input and output slots here
 128   // Input slot #0 works with a TChain
 129   DefineInput(0, TChain::Class());
 130   // Output slot #0 writes into a TList container
 131   DefineOutput(0, TList::Class());
 132 }
 133
 134 AliAnalysisTaskPhiCorrelations::~AliAnalysisTaskPhiCorrelations()
 135 {
 136   // destructor
 137
 138   if (fListOfHistos  && !AliAnalysisManager::GetAnalysisManager()->IsProofMode())
 139     delete fListOfHistos;
 140 }
 141
 142 //____________________________________________________________________
 143 void AliAnalysisTaskPhiCorrelations::ConnectInputData(Option_t* /*option*/)
 144 {
 145
 146   // Connect the input data
 147   if (fDebug > 1) AliInfo("ConnectInputData() ");
 148
 149   // Since AODs can either be connected to the InputEventHandler
 150   // or to the OutputEventHandler ( the AOD is created by a previus task in the train )
 151   // we need to get the pointer to the AODEvent correctly.
 152
 153   // Delta AODs are also accepted.
 154
 155   TObject* handler = AliAnalysisManager::GetAnalysisManager()->GetInputEventHandler();
 156
 157   if( handler && handler->InheritsFrom("AliAODInputHandler") )
 158   { // input AOD
 159     fAOD = ((AliAODInputHandler*)handler)->GetEvent();
 160     if (fDebug > 1) AliInfo(" ==== Tracks and Jets from AliAODInputHandler");
 161   }
 162   else
 163   {  //output AOD
 164     handler = AliAnalysisManager::GetAnalysisManager()->GetOutputEventHandler();
 165     if (handler && handler->InheritsFrom("AliAODHandler") )
 166     {
 167       fAOD = ((AliAODHandler*)handler)->GetAOD();
 168       if (fDebug > 1) AliInfo(" ==== Tracks and Jets from AliAODHandler");
 169     }
 170     else
 171     {  // no AOD
 172       AliWarning("I can't get any AOD Event Handler");
 173     }
 174   }
 175
 176   if (handler && handler->InheritsFrom("AliESDInputHandler") )
 177   { // input ESD
 178     // pointer received per event in ::Exec
 179     if (fDebug > 1) AliInfo(" ==== Tracks and Jets from AliESDInputHandler");
 180   }
 181
 182   // Initialize common pointers
 183   Initialize();
 184 }
 185
 186 //____________________________________________________________________
 187 void  AliAnalysisTaskPhiCorrelations::CreateOutputObjects()
 188 {
 189   // Create the output container
 190
 191   if (fDebug > 1) AliInfo("CreateOutputObjects()");
 192
 193   // Initialize class with main algorithms, event and track selection.
 194   fAnalyseUE = new AliAnalyseLeadingTrackUE();
 195   fAnalyseUE->SetParticleSelectionCriteria(fFilterBit, fUseChargeHadrons, fTrackEtaCut, fPtMin);
 196   fAnalyseUE->SetDebug(fDebug);
 197   fAnalyseUE->DefineESDCuts(fFilterBit);
 198
 199   // Initialize output list of containers
 200   if (fListOfHistos != NULL){
 201         delete fListOfHistos;
 202         fListOfHistos = NULL;
 203         }
 204   if (!fListOfHistos){
 205         fListOfHistos = new TList();
 206         fListOfHistos->SetOwner(kTRUE);
 207         }
 208
 209   // Initialize class to handle histograms
 210   const char* histType = "4";
 211   if (fUseVtxAxis)
 212     histType = "5";
 213   fHistos = new AliUEHistograms("AliUEHistogramsSame", histType);
 214   fHistosMixed = new AliUEHistograms("AliUEHistogramsMixed", histType);
 215
 216   fHistos->SetSelectCharge(fSelectCharge);
 217   fHistosMixed->SetSelectCharge(fSelectCharge);
 218
 219   fHistos->SetTriggerRestrictEta(fTriggerRestrictEta);
 220   fHistosMixed->SetTriggerRestrictEta(fTriggerRestrictEta);
 221
 222   fHistos->SetOnlyOneEtaSide(fOnlyOneEtaSide);
 223   fHistosMixed->SetOnlyOneEtaSide(fOnlyOneEtaSide);
 224
 225   fHistos->SetEtaOrdering(fEtaOrdering);
 226   fHistosMixed->SetEtaOrdering(fEtaOrdering);
 227
 228   fHistos->SetPairCuts(fCutConversions, fCutResonances);
 229   fHistosMixed->SetPairCuts(fCutConversions, fCutResonances);
 230
 231   // add histograms to list
 232   fListOfHistos->Add(fHistos);
 233   fListOfHistos->Add(fHistosMixed);
 234
 235   fListOfHistos->Add(new TH2F("trackletsVsV0Cent", ";L1 clusters;v0 centrality", 100, -0.5, 9999.5, 101, 0, 101));
 236   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));
 237   fListOfHistos->Add(new TH1F("eventStat", ";;events", 4, -0.5, 3.5));
 238   fListOfHistos->Add(new TH2F("mixedDist", ";centrality;tracks;events", 101, 0, 101, 200, 0, fMixingTracks * 1.5));
 239   fListOfHistos->Add(new TH1F("pids", ";pdg;tracks", 2001, -1000.5, 1000.5));
 240
 241   PostData(0,fListOfHistos);
 242
 243   // Add task configuration to output list
 244   AddSettingsTree();
 245
 246   // event mixing
 247   Int_t trackDepth = fMixingTracks;
 248   Int_t poolsize   = 1000;  // Maximum number of events, ignored in the present implemented of AliEventPoolManager
 249
 250   Int_t nCentralityBins  = fHistos->GetUEHist(2)->GetEventHist()->GetNBins(1);
 251   Double_t* centralityBins = (Double_t*) fHistos->GetUEHist(2)->GetEventHist()->GetAxis(1, 0)->GetXbins()->GetArray();
 252
 253   Int_t nZvtxBins  = 7+1+7;
 254   // bins for second buffer are shifted by 100 cm
 255   Double_t vertexBins[] = { -7, -5, -3, -1, 1, 3, 5, 7, 93, 95, 97, 99, 101, 103, 105, 107 };
 256   Double_t* zvtxbin = vertexBins;
 257
 258   if (fHistos->GetUEHist(2)->GetEventHist()->GetNVar() > 2)
 259   {
 260     nZvtxBins = fHistos->GetUEHist(2)->GetEventHist()->GetNBins(2);
 261     zvtxbin = (Double_t*) fHistos->GetUEHist(2)->GetEventHist()->GetAxis(2, 0)->GetXbins()->GetArray();
 262   }
 263
 264   fPoolMgr = new AliEventPoolManager(poolsize, trackDepth, nCentralityBins, centralityBins, nZvtxBins, zvtxbin);
 265 }
 266
 267 //____________________________________________________________________
 268 void  AliAnalysisTaskPhiCorrelations::Exec(Option_t */*option*/)
 269 {
 270   // receive ESD pointer if we are not running AOD analysis
 271   if (!fAOD)
 272   {
 273     AliVEventHandler* handler = AliAnalysisManager::GetAnalysisManager()->GetInputEventHandler();
 274     if (handler && handler->InheritsFrom("AliESDInputHandler"))
 275       fESD = ((AliESDInputHandler*)handler)->GetEvent();
 276   }
 277
 278   if (fMode)
 279   {
 280     // correction mode
 281
 282     if (fMcHandler)
 283       fMcEvent = fMcHandler->MCEvent();
 284
 285     if (fAOD)
 286     {
 287       // array of MC particles
 288       fArrayMC = dynamic_cast<TClonesArray*>(fAOD->FindListObject(AliAODMCParticle::StdBranchName()));
 289       if (!fArrayMC)
 290         AliFatal("No array of MC particles found !!!");
 291     }
 292
 293     AnalyseCorrectionMode();
 294   }
 295   else AnalyseDataMode();
 296 }
 297
 298 /******************** ANALYSIS METHODS *****************************/
 299
 300 //____________________________________________________________________
 301 void  AliAnalysisTaskPhiCorrelations::AddSettingsTree()
 302 {
 303   //Write settings to output list
 304   TTree *settingsTree   = new TTree("UEAnalysisSettings","Analysis Settings in UE estimation");
 305   settingsTree->Branch("fnTracksVertex", &fnTracksVertex,"nTracksVertex/I");
 306   settingsTree->Branch("fZVertex", &fZVertex,"ZVertex/D");
 307   //settingsTree->Branch("fCentralityMethod", fCentralityMethod.Data(),"CentralityMethod/C");
 308   settingsTree->Branch("fTrackEtaCut", &fTrackEtaCut, "TrackEtaCut/D");
 309   settingsTree->Branch("fOnlyOneEtaSide", &fOnlyOneEtaSide,"OnlyOneEtaSide/I");
 310   settingsTree->Branch("fPtMin", &fPtMin, "PtMin/D");
 311   settingsTree->Branch("fFilterBit", &fFilterBit,"FilterBit/I");
 312   settingsTree->Branch("fSelectBit", &fSelectBit,"EventSelectionBit/I");
 313   settingsTree->Branch("fUseChargeHadrons", &fUseChargeHadrons,"UseChHadrons/O");
 314   settingsTree->Branch("fSelectCharge", &fSelectCharge,"SelectCharge/I");
 315   settingsTree->Branch("fTriggerRestrictEta", &fTriggerRestrictEta,"TriggerRestrictEta/D");
 316   settingsTree->Branch("fEtaOrdering", &fEtaOrdering,"EtaOrdering/O");
 317   settingsTree->Branch("fCutConversions", &fCutConversions,"CutConversions/O");
 318   settingsTree->Branch("fCutResonances", &fCutResonances,"CutResonances/O");
 319   settingsTree->Branch("fFillpT", &fFillpT,"FillpT/O");
 320   settingsTree->Branch("fkTrackingEfficiency", "TH1D", &fkTrackingEfficiency);
 321   settingsTree->Branch("fMixingTracks", &fMixingTracks,"MixingTracks/I");
 322   settingsTree->Branch("fSkipTrigger", &fSkipTrigger,"SkipTrigger/O");
 323   settingsTree->Branch("fRejectCentralityOutliers", &fRejectCentralityOutliers,"RejectCentralityOutliers/O");
 324
 325   settingsTree->Fill();
 326   fListOfHistos->Add(settingsTree);
 327 }
 328
 329 //____________________________________________________________________
 330 void  AliAnalysisTaskPhiCorrelations::AnalyseCorrectionMode()
 331 {
 332   // Run the analysis on MC to get the correction maps
 333   //
 334
 335   if ( fDebug > 3 ) AliInfo( " Processing event in Corrections mode ..." );
 336
 337   Double_t centrality = 0;
 338
 339   if (fCentralityMethod.Length() > 0)
 340   {
 341     AliCentrality *centralityObj = 0;
 342     if (fAOD)
 343       centralityObj = fAOD->GetHeader()->GetCentralityP();
 344     else if (fESD)
 345       centralityObj = fESD->GetCentrality();
 346
 347     if (centralityObj)
 348     {
 349       centrality = centralityObj->GetCentralityPercentileUnchecked(fCentralityMethod);
 350       AliInfo(Form("Centrality is %f", centrality));
 351     }
 352     else
 353     {
 354       Printf("WARNING: Centrality object is 0");
 355       centrality = -1;
 356      }
 357   }
 358
 359   // Support for ESD and AOD based analysis
 360   AliVEvent* inputEvent = fAOD;
 361   if (!inputEvent)
 362     inputEvent = fESD;
 363
 364   Float_t bSign = 0;
 365
 366   if (inputEvent)
 367   {
 368     fHistos->SetRunNumber(inputEvent->GetRunNumber());
 369     bSign = (inputEvent->GetMagneticField() > 0) ? 1 : -1;
 370   }
 371
 372   TObject* mc = fArrayMC;
 373   if (!mc)
 374     mc = fMcEvent;
 375
 376   // count all events
 377   fHistos->FillEvent(centrality, -1);
 378
 379   // Only consider MC events within the vtx-z region used also as cut on the reconstructed vertex
 380   TObject* vertexSupplier = fMcEvent;
 381   if (fAOD) // AOD
 382     vertexSupplier = fAOD->FindListObject(AliAODMCHeader::StdBranchName());
 383
 384   if (!fAnalyseUE->VertexSelection(vertexSupplier, 0, fZVertex))
 385     return;
 386
 387   Float_t zVtx = 0;
 388   if (fAOD)
 389     zVtx = ((AliAODMCHeader*) vertexSupplier)->GetVtxZ();
 390   else
 391     zVtx = fMcEvent->GetPrimaryVertex()->GetZ();
 392   Float_t weight = 1;
 393   if (fFillpT)
 394     weight = -1;
 395
 396   // Get MC primaries
 397   TObjArray* tracksMC = fAnalyseUE->GetAcceptedParticles(mc, 0, kTRUE, -1, kTRUE);
 398
 399   if (fAOD)
 400   {
 401     for (Int_t i=0; i<fArrayMC->GetEntriesFast(); i++)
 402       ((TH1F*) fListOfHistos->FindObject("pids"))->Fill(((AliAODMCParticle*) fArrayMC->At(i))->PdgCode());
 403   }
 404   else
 405   {
 406     for (Int_t i=0; i<fMcEvent->GetNumberOfTracks(); i++)
 407       ((TH1F*) fListOfHistos->FindObject("pids"))->Fill(fMcEvent->GetTrack(i)->PdgCode());
 408   }
 409
 410   // (MC-true all particles)
 411   // STEP 0
 412   fHistos->FillCorrelations(centrality, zVtx, AliUEHist::kCFStepAll, tracksMC, 0, weight);
 413
 414   // mixed event
 415   if (fFillMixed)
 416   {
 417     AliEventPool* pool = fPoolMgr->GetEventPool(centrality, zVtx);
 418     //pool->PrintInfo();
 419     if (pool->IsReady() || pool->NTracksInPool() > fMixingTracks / 10 || pool->GetCurrentNEvents() >= 5)
 420       for (Int_t jMix=0; jMix<pool->GetCurrentNEvents(); jMix++)
 421         fHistosMixed->FillCorrelations(centrality, zVtx, AliUEHist::kCFStepAll, tracksMC, pool->GetEvent(jMix), 1.0 / pool->GetCurrentNEvents(), (jMix == 0));
 422     pool->UpdatePool(CloneAndReduceTrackList(tracksMC));
 423   }
 424
 425 //   Printf("trigger: %d", ((AliInputEventHandler*)fInputHandler)->IsEventSelected());
 426
 427   // Trigger selection ************************************************
 428   if (!fFillOnlyStep0 && (fSkipTrigger || fAnalyseUE->TriggerSelection(fInputHandler)))
 429   {
 430     // (MC-true all particles)
 431     // STEP 1
 432     if (!fReduceMemoryFootprint)
 433       fHistos->FillCorrelations(centrality, zVtx, AliUEHist::kCFStepTriggered, tracksMC, 0, weight);
 434     else
 435       fHistos->FillEvent(centrality, AliUEHist::kCFStepTriggered);
 436
 437     if (!inputEvent) {
 438       AliFatal("UNEXPECTED: inputEvent is 0. Trigger selection should have failed");
 439       return;
 440     }
 441
 442     // Vertex selection *************************************************
 443     if (fAnalyseUE->VertexSelection(inputEvent, fnTracksVertex, fZVertex))
 444     {
 445       // fill here for tracking efficiency
 446       // loop over particle species
 447
 448       for (Int_t particleSpecies = 0; particleSpecies < 4; particleSpecies++)
 449       {
 450         TObjArray* primMCParticles = fAnalyseUE->GetAcceptedParticles(mc, 0x0, kTRUE, particleSpecies, kTRUE);
 451         TObjArray* primRecoTracksMatched = fAnalyseUE->GetAcceptedParticles(inputEvent, mc, kTRUE, particleSpecies, kTRUE);
 452         TObjArray* allRecoTracksMatched = fAnalyseUE->GetAcceptedParticles(inputEvent, mc, kFALSE, particleSpecies, kTRUE);
 453
 454         fHistos->FillTrackingEfficiency(primMCParticles, primRecoTracksMatched, allRecoTracksMatched, particleSpecies, centrality);
 455
 456 //      Printf("%d --> %d %d %d", particleSpecies, primMCParticles->GetEntries(), primRecoTracksMatched->GetEntries(), allRecoTracksMatched->GetEntries());
 457
 458         delete primMCParticles;
 459         delete primRecoTracksMatched;
 460         delete allRecoTracksMatched;
 461       }
 462
 463       // (MC-true all particles)
 464       // STEP 2
 465       if (!fReduceMemoryFootprint)
 466         fHistos->FillCorrelations(centrality, zVtx, AliUEHist::kCFStepVertex, tracksMC, 0, weight);
 467       else
 468         fHistos->FillEvent(centrality, AliUEHist::kCFStepVertex);
 469
 470       // Get MC primaries that match reconstructed track
 471       TObjArray* tracksRecoMatchedPrim = fAnalyseUE->GetAcceptedParticles(inputEvent, mc, kTRUE, -1, kTRUE);
 472
 473       // (RECO-matched (quantities from MC particle) primary particles)
 474       // STEP 4
 475       fHistos->FillCorrelations(centrality, zVtx, AliUEHist::kCFStepTrackedOnlyPrim, tracksRecoMatchedPrim, 0, weight);
 476
 477       // Get MC primaries + secondaries that match reconstructed track
 478       TObjArray* tracksRecoMatchedAll = fAnalyseUE->GetAcceptedParticles(inputEvent, mc, kFALSE, -1, kTRUE);
 479
 480       // (RECO-matched (quantities from MC particle) all particles)
 481       // STEP 5
 482       fHistos->FillCorrelations(centrality, zVtx, AliUEHist::kCFStepTracked, tracksRecoMatchedAll, 0, weight);
 483
 484       // Get RECO tracks
 485       TObjArray* tracks = fAnalyseUE->GetAcceptedParticles(inputEvent, 0, kTRUE, -1, kTRUE);
 486
 487       // (RECO all tracks)
 488       // STEP 6
 489       if (!fSkipStep6)
 490         fHistos->FillCorrelations(centrality, zVtx, AliUEHist::kCFStepReconstructed, tracks, 0, weight);
 491
 492       // two track cut, STEP 8
 493       if (fTwoTrackEfficiencyCut > 0)
 494         fHistos->FillCorrelations(centrality, zVtx, AliUEHist::kCFStepBiasStudy, tracks, 0, weight, kTRUE, kTRUE, bSign, fTwoTrackEfficiencyCut);
 495
 496       // mixed event
 497       if (fFillMixed && !fSkipStep6)
 498       {
 499         AliEventPool* pool2 = fPoolMgr->GetEventPool(centrality, zVtx + 100);
 500         //pool2->PrintInfo();
 501         if (pool2->IsReady() || pool2->NTracksInPool() > fMixingTracks / 10 || pool2->GetCurrentNEvents() >= 5)
 502           for (Int_t jMix=0; jMix<pool2->GetCurrentNEvents(); jMix++)
 503           {
 504             // STEP 6
 505             fHistosMixed->FillCorrelations(centrality, zVtx, AliUEHist::kCFStepReconstructed, tracks, pool2->GetEvent(jMix), 1.0 / pool2->GetCurrentNEvents(), (jMix == 0));
 506
 507             // two track cut, STEP 8
 508             if (fTwoTrackEfficiencyCut > 0)
 509               fHistosMixed->FillCorrelations(centrality, zVtx, AliUEHist::kCFStepBiasStudy, tracks, pool2->GetEvent(jMix), 1.0 / pool2->GetCurrentNEvents(), (jMix == 0), kTRUE, bSign, fTwoTrackEfficiencyCut);
 510           }
 511         pool2->UpdatePool(CloneAndReduceTrackList(tracks));
 512       }
 513
 514       if (0 && !fReduceMemoryFootprint)
 515       {
 516         // make list of secondaries (matched with MC)
 517         TObjArray* tracksRecoMatchedSecondaries = new TObjArray;
 518         for (Int_t i=0; i<tracksRecoMatchedAll->GetEntriesFast(); i++)
 519           if (((AliAODMCParticle*)tracksRecoMatchedAll->At(i))->IsPhysicalPrimary() == kFALSE)
 520             tracksRecoMatchedSecondaries->Add(tracksRecoMatchedAll->At(i));
 521
 522         // Study: Use only secondaries as trigger particles and plot the correlation vs. all particles; store in step 9
 523         fHistos->FillCorrelations(centrality, zVtx, AliUEHist::kCFStepBiasStudy2, tracksRecoMatchedSecondaries, tracksRecoMatchedAll, weight);
 524
 525         // Study: Use only primaries as trigger particles and plot the correlation vs. secondaries; store in step 8
 526         fHistos->FillCorrelations(centrality, zVtx, AliUEHist::kCFStepBiasStudy, tracksRecoMatchedPrim, tracksRecoMatchedSecondaries, weight);
 527
 528         // plot delta phi vs process id of secondaries
 529         // trigger particles: primaries in 4 < pT < 10
 530         // associated particles: secondaries in 1 < pT < 10
 531
 532         for (Int_t i=0; i<tracksRecoMatchedPrim->GetEntriesFast(); i++)
 533         {
 534           AliVParticle* triggerParticle = (AliVParticle*) tracksRecoMatchedPrim->At(i);
 535
 536           if (triggerParticle->Pt() < 4 || triggerParticle->Pt() > 10)
 537             continue;
 538
 539           for (Int_t j=0; j<tracksRecoMatchedSecondaries->GetEntriesFast(); j++)
 540           {
 541             AliAODMCParticle* particle = (AliAODMCParticle*) tracksRecoMatchedSecondaries->At(j);
 542
 543             if (particle->Pt() < 1 || particle->Pt() > 10)
 544               continue;
 545
 546             if (particle->Pt() > triggerParticle->Pt())
 547               continue;
 548
 549             Double_t deltaPhi = triggerParticle->Phi() - particle->Phi();
 550             if (deltaPhi > 1.5 * TMath::Pi())
 551               deltaPhi -= TMath::TwoPi();
 552             if (deltaPhi < -0.5 * TMath::Pi())
 553               deltaPhi += TMath::TwoPi();
 554
 555             Int_t processID = fMcEvent->Stack()->Particle(particle->GetLabel())->GetUniqueID();
 556
 557             ((TH2F*) fListOfHistos->FindObject("processIDs"))->Fill(deltaPhi, processID);
 558           }
 559         }
 560
 561         delete tracksRecoMatchedSecondaries;
 562       }
 563
 564       delete tracksRecoMatchedPrim;
 565       delete tracksRecoMatchedAll;
 566       delete tracks;
 567     }
 568   }
 569
 570   delete tracksMC;
 571 }
 572
 573 //____________________________________________________________________
 574 void  AliAnalysisTaskPhiCorrelations::AnalyseDataMode()
 575 {
 576
 577   // Run the analysis on DATA or MC to get raw distributions
 578
 579   if ( fDebug > 3 ) AliInfo( " Processing event in Data mode ..." );
 580
 581   ((TH1F*) fListOfHistos->FindObject("eventStat"))->Fill(0);
 582
 583   if (!fInputHandler)
 584     return;
 585
 586   // skip not selected events here (the AOD is not updated for those)
 587   if (!(fInputHandler->IsEventSelected() & (AliVEvent::kMB | AliVEvent::kUserDefined)))
 588     return;
 589
 590   Double_t centrality = 0;
 591
 592   AliCentrality *centralityObj = 0;
 593   if (fCentralityMethod.Length() > 0)
 594   {
 595     if (fAOD)
 596       centralityObj = fAOD->GetHeader()->GetCentralityP();
 597     else if (fESD)
 598       centralityObj = fESD->GetCentrality();
 599
 600     if (centralityObj)
 601       centrality = centralityObj->GetCentralityPercentile(fCentralityMethod);
 602       //centrality = centralityObj->GetCentralityPercentileUnchecked(fCentralityMethod);
 603     else
 604       centrality = -1;
 605
 606     if (fAOD)
 607     {
 608       // remove outliers
 609       if (centrality == 0)
 610       {
 611         if (fAOD->GetVZEROData())
 612         {
 613           Float_t multV0 = 0;
 614           for (Int_t i=0; i<64; i++)
 615             multV0 += fAOD->GetVZEROData()->GetMultiplicity(i);
 616           if (multV0 < 19500)
 617           {
 618             centrality = -1;
 619             AliInfo("Rejecting event due to too small V0 multiplicity");
 620           }
 621         }
 622       }
 623     }
 624
 625     AliInfo(Form("Centrality is %f", centrality));
 626   }
 627
 628   // Support for ESD and AOD based analysis
 629   AliVEvent* inputEvent = fAOD;
 630   if (!inputEvent)
 631     inputEvent = fESD;
 632
 633   Float_t bSign = (inputEvent->GetMagneticField() > 0) ? 1 : -1;
 634
 635   fHistos->SetRunNumber(inputEvent->GetRunNumber());
 636
 637   // Fill the "event-counting-container", it is needed to get the number of events remaining after each event-selection cut
 638   fHistos->FillEvent(centrality, AliUEHist::kCFStepAll);
 639
 640   // Trigger selection ************************************************
 641   if (!fAnalyseUE->TriggerSelection(fInputHandler)) return;
 642
 643   // Fill the "event-counting-container", it is needed to get the number of events remaining after each event-selection cut
 644   fHistos->FillEvent(centrality, AliUEHist::kCFStepTriggered);
 645
 646   // Vertex selection *************************************************
 647   if(!fAnalyseUE->VertexSelection(inputEvent, fnTracksVertex, fZVertex)) return;
 648
 649   // Fill the "event-counting-container", it is needed to get the number of events remaining after each event-selection cut
 650   fHistos->FillEvent(centrality, AliUEHist::kCFStepVertex);
 651
 652   // optimization
 653   if (centrality < 0 && !fCompareCentralities)
 654     return;
 655
 656   TObjArray* tracks = fAnalyseUE->GetAcceptedParticles(inputEvent, 0, kTRUE, -1, kTRUE);
 657
 658   // check for outlier in centrality vs number of tracks (rough constants extracted from correlation histgram)
 659   Bool_t reject = kFALSE;
 660   if (fRejectCentralityOutliers)
 661   {
 662     if (centrality > 40 && centrality <= 50 && tracks->GetEntriesFast() > 1160)
 663       reject = kTRUE;
 664     if (centrality > 50 && centrality <= 60 && tracks->GetEntriesFast() > 650)
 665       reject = kTRUE;
 666     if (centrality > 60 && centrality <= 70 && tracks->GetEntriesFast() > 370)
 667       reject = kTRUE;
 668     if (centrality > 70 && centrality <= 80 && tracks->GetEntriesFast() > 220)
 669       reject = kTRUE;
 670     if (centrality > 80 && centrality <= 90 && tracks->GetEntriesFast() > 130)
 671       reject = kTRUE;
 672     if (centrality > 90 && tracks->GetEntriesFast() > 75)
 673       reject = kTRUE;
 674   }
 675
 676   if (reject)
 677   {
 678     AliInfo(Form("Rejecting event due to centrality vs tracks correlation: %f %d", centrality, tracks->GetEntriesFast()));
 679     fHistos->FillEvent(centrality, AliUEHist::kCFStepAnaTopology);
 680     delete tracks;
 681     return;
 682   }
 683
 684
 685   // create a list of reduced objects. This speeds up processing and reduces memory consumption for the event pool
 686   TObjArray* tracksClone = CloneAndReduceTrackList(tracks);
 687   delete tracks;
 688
 689   //Printf("Accepted %d tracks", tracks->GetEntries());
 690
 691   const AliVVertex* vertex = inputEvent->GetPrimaryVertex();
 692   Double_t zVtx = vertex->GetZ();
 693
 694   Float_t weight = 1;
 695   if (fFillpT)
 696     weight = -1;
 697
 698   // fill two different centralities (syst study)
 699   // the zvtx axis is used to distinguish the results of both centralities: configured centrality in zvtx = 0, SPD in zvtx = 2
 700   if (fCompareCentralities)
 701     zVtx = 0;
 702
 703   // Fill containers at STEP 6 (reconstructed)
 704   if (centrality >= 0)
 705   {
 706     if (!fSkipStep6)
 707       fHistos->FillCorrelations(centrality, zVtx, AliUEHist::kCFStepReconstructed, tracksClone, 0, weight);
 708
 709     ((TH1F*) fListOfHistos->FindObject("eventStat"))->Fill(1);
 710
 711     if (fTwoTrackEfficiencyCut > 0)
 712       fHistos->FillCorrelations(centrality, zVtx, AliUEHist::kCFStepBiasStudy, tracksClone, 0, weight, kTRUE, kTRUE, bSign, fTwoTrackEfficiencyCut);
 713   }
 714
 715   // fill second time with SPD centrality
 716   if (fCompareCentralities && centralityObj)
 717   {
 718     centrality = centralityObj->GetCentralityPercentile("CL1");
 719     if (centrality >= 0 && !fSkipStep6)
 720       fHistos->FillCorrelations(centrality, 2, AliUEHist::kCFStepReconstructed, tracksClone, 0, weight);
 721   }
 722
 723   if (fFillMixed)
 724   {
 725     // event mixing
 726
 727     // 1. First get an event pool corresponding in mult (cent) and
 728     //    zvertex to the current event. Once initialized, the pool
 729     //    should contain nMix (reduced) events. This routine does not
 730     //    pre-scan the chain. The first several events of every chain
 731     //    will be skipped until the needed pools are filled to the
 732     //    specified depth. If the pool categories are not too rare, this
 733     //    should not be a problem. If they are rare, you could lose
 734     //    statistics.
 735
 736     // 2. Collect the whole pool's content of tracks into one TObjArray
 737     //    (bgTracks), which is effectively a single background super-event.
 738
 739     // 3. The reduced and bgTracks arrays must both be passed into
 740     //    FillCorrelations(). Also nMix should be passed in, so a weight
 741     //    of 1./nMix can be applied.
 742
 743     AliEventPool* pool = fPoolMgr->GetEventPool(centrality, zVtx);
 744
 745     if (!pool)
 746       AliFatal(Form("No pool found for centrality = %f, zVtx = %f", centrality, zVtx));
 747
 748     //pool->SetDebug(1);
 749
 750     if (pool->IsReady() || pool->NTracksInPool() > fMixingTracks / 10 || pool->GetCurrentNEvents() >= 5)
 751     {
 752
 753       Int_t nMix = pool->GetCurrentNEvents();
 754 //       cout << "nMix = " << nMix << " tracks in pool = " << pool->NTracksInPool() << endl;
 755
 756       ((TH1F*) fListOfHistos->FindObject("eventStat"))->Fill(2);
 757       ((TH2F*) fListOfHistos->FindObject("mixedDist"))->Fill(centrality, pool->NTracksInPool());
 758       if (pool->IsReady())
 759         ((TH1F*) fListOfHistos->FindObject("eventStat"))->Fill(3);
 760
 761       // Fill mixed-event histos here
 762       for (Int_t jMix=0; jMix<nMix; jMix++)
 763       {
 764         TObjArray* bgTracks = pool->GetEvent(jMix);
 765
 766         if (!fSkipStep6)
 767           fHistosMixed->FillCorrelations(centrality, zVtx, AliUEHist::kCFStepReconstructed, tracksClone, bgTracks, 1.0 / nMix, (jMix == 0));
 768
 769         if (fTwoTrackEfficiencyCut > 0)
 770           fHistosMixed->FillCorrelations(centrality, zVtx, AliUEHist::kCFStepBiasStudy, tracksClone, bgTracks, 1.0 / nMix, (jMix == 0), kTRUE, bSign, fTwoTrackEfficiencyCut);
 771       }
 772     }
 773
 774     // ownership is with the pool now
 775     pool->UpdatePool(tracksClone);
 776     //pool->PrintInfo();
 777   }
 778   else
 779     delete tracksClone;
 780 }
 781
 782 TObjArray* AliAnalysisTaskPhiCorrelations::CloneAndReduceTrackList(TObjArray* tracks)
 783 {
 784   // clones a track list by using AliDPhiBasicParticle which uses much less memory (used for event mixing)
 785
 786   TObjArray* tracksClone = new TObjArray;
 787   tracksClone->SetOwner(kTRUE);
 788
 789   for (Int_t i=0; i<tracks->GetEntriesFast(); i++)
 790   {
 791     AliVParticle* particle = (AliVParticle*) tracks->At(i);
 792     tracksClone->Add(new AliDPhiBasicParticle(particle->Eta(), particle->Phi(), particle->Pt(), particle->Charge()));
 793   }
 794
 795   return tracksClone;
 796 }
 797
 798 //____________________________________________________________________
 799 void  AliAnalysisTaskPhiCorrelations::Initialize()
 800 {
 801   // input handler
 802   fInputHandler = (AliInputEventHandler*)
 803          ((AliAnalysisManager::GetAnalysisManager())->GetInputEventHandler());
 804   // MC handler
 805   fMcHandler = dynamic_cast<AliMCEventHandler*> (AliAnalysisManager::GetAnalysisManager()->GetMCtruthEventHandler());
 806 }