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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  10  * copies and that both the copyright notice and this permission notice   *
  11  * appear in the supporting documentation. The authors make no claims     *
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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 #include "AliGenCocktailEventHeader.h"
  49 #include "AliGenEventHeader.h"
  50
  51 #include "AliEventPoolManager.h"
  52
  53
  54 ////////////////////////////////////////////////////////////////////////
  55 //
  56 // Analysis class for azimuthal correlation studies
  57 // Based on the UE task from Sara Vallero and Jan Fiete
  58 //
  59 // This class needs input AODs.
  60 // The output is a list of analysis-specific containers.
  61 //
  62 // The AOD can be either connected to the InputEventHandler
  63 // for a chain of AOD files
  64 // or
  65 // to the OutputEventHandler
  66 // for a chain of ESD files,
  67 // in this case the class should be in the train after the jet-finder
  68 //
  69 //    Authors:
  70 //    Jan Fiete Grosse-Oetringhaus
  71 //
  72 ////////////////////////////////////////////////////////////////////////
  73
  74
  75 ClassImp( AliAnalysisTaskPhiCorrelations )
  76 ClassImp( AliDPhiBasicParticle )
  77
  78 //____________________________________________________________________
  79 AliAnalysisTaskPhiCorrelations:: AliAnalysisTaskPhiCorrelations(const char* name):
  80 AliAnalysisTask(name,""),
  81 // general configuration
  82 fDebug(0),
  83 fMode(0),
  84 fReduceMemoryFootprint(kFALSE),
  85 fFillMixed(kTRUE),
  86 fMixingTracks(50000),
  87 fCompareCentralities(kFALSE),
  88 fTwoTrackEfficiencyStudy(kFALSE),
  89 fTwoTrackEfficiencyCut(0),
  90 fUseVtxAxis(kFALSE),
  91 fSkipTrigger(kFALSE),
  92 fInjectedSignals(kFALSE),
  93 // pointers to UE classes
  94 fAnalyseUE(0x0),
  95 fHistos(0x0),
  96 fHistosMixed(0),
  97 fkTrackingEfficiency(0x0),
  98 // handlers and events
  99 fAOD(0x0),
 100 fESD(0x0),
 101 fArrayMC(0x0),
 102 fInputHandler(0x0),
 103 fMcEvent(0x0),
 104 fMcHandler(0x0),
 105 fPoolMgr(0x0),
 106 // histogram settings
 107 fListOfHistos(0x0),
 108 // event QA
 109 fnTracksVertex(1),  // QA tracks pointing to principal vertex (= 3 default)
 110 fZVertex(7.),
 111 fCentralityMethod("V0M"),
 112 // track cuts
 113 fTrackEtaCut(0.8),
 114 fOnlyOneEtaSide(0),
 115 fPtMin(0.5),
 116 fFilterBit(0xFF),
 117 fSelectBit(AliVEvent::kMB|AliVEvent::kUserDefined),
 118 fUseChargeHadrons(kFALSE),
 119 fSelectCharge(0),
 120 fTriggerSelectCharge(0),
 121 fTriggerRestrictEta(-1),
 122 fEtaOrdering(kFALSE),
 123 fCutConversions(kFALSE),
 124 fCutResonances(kFALSE),
 125 fFillOnlyStep0(kFALSE),
 126 fSkipStep6(kFALSE),
 127 fRejectCentralityOutliers(kFALSE),
 128 fFillpT(kFALSE)
 129 {
 130   // Default constructor
 131   // Define input and output slots here
 132   // Input slot #0 works with a TChain
 133   DefineInput(0, TChain::Class());
 134   // Output slot #0 writes into a TList container
 135   DefineOutput(0, TList::Class());
 136 }
 137
 138 AliAnalysisTaskPhiCorrelations::~AliAnalysisTaskPhiCorrelations()
 139 {
 140   // destructor
 141
 142   if (fListOfHistos  && !AliAnalysisManager::GetAnalysisManager()->IsProofMode())
 143     delete fListOfHistos;
 144 }
 145
 146 //____________________________________________________________________
 147 void AliAnalysisTaskPhiCorrelations::ConnectInputData(Option_t* /*option*/)
 148 {
 149
 150   // Connect the input data
 151   if (fDebug > 1) AliInfo("ConnectInputData() ");
 152
 153   // Since AODs can either be connected to the InputEventHandler
 154   // or to the OutputEventHandler ( the AOD is created by a previus task in the train )
 155   // we need to get the pointer to the AODEvent correctly.
 156
 157   // Delta AODs are also accepted.
 158
 159   TObject* handler = AliAnalysisManager::GetAnalysisManager()->GetInputEventHandler();
 160
 161   if( handler && handler->InheritsFrom("AliAODInputHandler") )
 162   { // input AOD
 163     fAOD = ((AliAODInputHandler*)handler)->GetEvent();
 164     if (fDebug > 1) AliInfo(" ==== Tracks and Jets from AliAODInputHandler");
 165   }
 166   else
 167   {  //output AOD
 168     handler = AliAnalysisManager::GetAnalysisManager()->GetOutputEventHandler();
 169     if (handler && handler->InheritsFrom("AliAODHandler") )
 170     {
 171       fAOD = ((AliAODHandler*)handler)->GetAOD();
 172       if (fDebug > 1) AliInfo(" ==== Tracks and Jets from AliAODHandler");
 173     }
 174     else
 175     {  // no AOD
 176       AliWarning("I can't get any AOD Event Handler");
 177     }
 178   }
 179
 180   if (handler && handler->InheritsFrom("AliESDInputHandler") )
 181   { // input ESD
 182     // pointer received per event in ::Exec
 183     if (fDebug > 1) AliInfo(" ==== Tracks and Jets from AliESDInputHandler");
 184   }
 185
 186   // Initialize common pointers
 187   Initialize();
 188 }
 189
 190 //____________________________________________________________________
 191 void  AliAnalysisTaskPhiCorrelations::CreateOutputObjects()
 192 {
 193   // Create the output container
 194
 195   if (fDebug > 1) AliInfo("CreateOutputObjects()");
 196
 197   // Initialize class with main algorithms, event and track selection.
 198   fAnalyseUE = new AliAnalyseLeadingTrackUE();
 199   fAnalyseUE->SetParticleSelectionCriteria(fFilterBit, fUseChargeHadrons, fTrackEtaCut, fPtMin);
 200   fAnalyseUE->SetDebug(fDebug);
 201   fAnalyseUE->DefineESDCuts(fFilterBit);
 202   fAnalyseUE->SetEventSelection(fSelectBit);
 203
 204   // Initialize output list of containers
 205   if (fListOfHistos != NULL){
 206         delete fListOfHistos;
 207         fListOfHistos = NULL;
 208         }
 209   if (!fListOfHistos){
 210         fListOfHistos = new TList();
 211         fListOfHistos->SetOwner(kTRUE);
 212         }
 213
 214   // Initialize class to handle histograms
 215   const char* histType = "4";
 216   if (fUseVtxAxis)
 217     histType = "5";
 218   fHistos = new AliUEHistograms("AliUEHistogramsSame", histType);
 219   fHistosMixed = new AliUEHistograms("AliUEHistogramsMixed", histType);
 220
 221   fHistos->SetSelectCharge(fSelectCharge);
 222   fHistosMixed->SetSelectCharge(fSelectCharge);
 223
 224   fHistos->SetSelectCharge(fTriggerSelectCharge);
 225   fHistosMixed->SetSelectCharge(fTriggerSelectCharge);
 226
 227   fHistos->SetTriggerRestrictEta(fTriggerRestrictEta);
 228   fHistosMixed->SetTriggerRestrictEta(fTriggerRestrictEta);
 229
 230   fHistos->SetOnlyOneEtaSide(fOnlyOneEtaSide);
 231   fHistosMixed->SetOnlyOneEtaSide(fOnlyOneEtaSide);
 232
 233   fHistos->SetEtaOrdering(fEtaOrdering);
 234   fHistosMixed->SetEtaOrdering(fEtaOrdering);
 235
 236   fHistos->SetPairCuts(fCutConversions, fCutResonances);
 237   fHistosMixed->SetPairCuts(fCutConversions, fCutResonances);
 238
 239   // add histograms to list
 240   fListOfHistos->Add(fHistos);
 241   fListOfHistos->Add(fHistosMixed);
 242
 243   fListOfHistos->Add(new TH2F("trackletsVsV0Cent", ";L1 clusters;v0 centrality", 100, -0.5, 9999.5, 101, 0, 101));
 244   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));
 245   fListOfHistos->Add(new TH1F("eventStat", ";;events", 4, -0.5, 3.5));
 246   fListOfHistos->Add(new TH2F("mixedDist", ";centrality;tracks;events", 101, 0, 101, 200, 0, fMixingTracks * 1.5));
 247   fListOfHistos->Add(new TH1F("pids", ";pdg;tracks", 2001, -1000.5, 1000.5));
 248
 249   PostData(0,fListOfHistos);
 250
 251   // Add task configuration to output list
 252   AddSettingsTree();
 253
 254   // event mixing
 255   Int_t trackDepth = fMixingTracks;
 256   Int_t poolsize   = 1000;  // Maximum number of events, ignored in the present implemented of AliEventPoolManager
 257
 258   Int_t nCentralityBins  = fHistos->GetUEHist(2)->GetEventHist()->GetNBins(1);
 259   Double_t* centralityBins = (Double_t*) fHistos->GetUEHist(2)->GetEventHist()->GetAxis(1, 0)->GetXbins()->GetArray();
 260
 261   Int_t nZvtxBins  = 7+1+7;
 262   // bins for second buffer are shifted by 100 cm
 263   Double_t vertexBins[] = { -7, -5, -3, -1, 1, 3, 5, 7, 93, 95, 97, 99, 101, 103, 105, 107 };
 264   Double_t* zvtxbin = vertexBins;
 265
 266   if (fHistos->GetUEHist(2)->GetEventHist()->GetNVar() > 2)
 267   {
 268     nZvtxBins = fHistos->GetUEHist(2)->GetEventHist()->GetNBins(2);
 269     zvtxbin = (Double_t*) fHistos->GetUEHist(2)->GetEventHist()->GetAxis(2, 0)->GetXbins()->GetArray();
 270   }
 271
 272   fPoolMgr = new AliEventPoolManager(poolsize, trackDepth, nCentralityBins, centralityBins, nZvtxBins, zvtxbin);
 273 }
 274
 275 //____________________________________________________________________
 276 void  AliAnalysisTaskPhiCorrelations::Exec(Option_t */*option*/)
 277 {
 278   // receive ESD pointer if we are not running AOD analysis
 279   if (!fAOD)
 280   {
 281     AliVEventHandler* handler = AliAnalysisManager::GetAnalysisManager()->GetInputEventHandler();
 282     if (handler && handler->InheritsFrom("AliESDInputHandler"))
 283       fESD = ((AliESDInputHandler*)handler)->GetEvent();
 284   }
 285
 286   if (fMode)
 287   {
 288     // correction mode
 289
 290     if (fMcHandler)
 291       fMcEvent = fMcHandler->MCEvent();
 292
 293     if (fAOD)
 294     {
 295       // array of MC particles
 296       fArrayMC = dynamic_cast<TClonesArray*>(fAOD->FindListObject(AliAODMCParticle::StdBranchName()));
 297       if (!fArrayMC)
 298         AliFatal("No array of MC particles found !!!");
 299     }
 300
 301     AnalyseCorrectionMode();
 302   }
 303   else AnalyseDataMode();
 304 }
 305
 306 /******************** ANALYSIS METHODS *****************************/
 307
 308 //____________________________________________________________________
 309 void  AliAnalysisTaskPhiCorrelations::AddSettingsTree()
 310 {
 311   //Write settings to output list
 312   TTree *settingsTree   = new TTree("UEAnalysisSettings","Analysis Settings in UE estimation");
 313   settingsTree->Branch("fnTracksVertex", &fnTracksVertex,"nTracksVertex/I");
 314   settingsTree->Branch("fZVertex", &fZVertex,"ZVertex/D");
 315   //settingsTree->Branch("fCentralityMethod", fCentralityMethod.Data(),"CentralityMethod/C");
 316   settingsTree->Branch("fTrackEtaCut", &fTrackEtaCut, "TrackEtaCut/D");
 317   settingsTree->Branch("fOnlyOneEtaSide", &fOnlyOneEtaSide,"OnlyOneEtaSide/I");
 318   settingsTree->Branch("fPtMin", &fPtMin, "PtMin/D");
 319   settingsTree->Branch("fFilterBit", &fFilterBit,"FilterBit/I");
 320   settingsTree->Branch("fSelectBit", &fSelectBit,"EventSelectionBit/I");
 321   settingsTree->Branch("fUseChargeHadrons", &fUseChargeHadrons,"UseChHadrons/O");
 322   settingsTree->Branch("fSelectCharge", &fSelectCharge,"SelectCharge/I");
 323   settingsTree->Branch("fTriggerSelectCharge", &fTriggerSelectCharge,"TriggerSelectCharge/I");
 324   settingsTree->Branch("fTriggerRestrictEta", &fTriggerRestrictEta,"TriggerRestrictEta/D");
 325   settingsTree->Branch("fEtaOrdering", &fEtaOrdering,"EtaOrdering/O");
 326   settingsTree->Branch("fCutConversions", &fCutConversions,"CutConversions/O");
 327   settingsTree->Branch("fCutResonances", &fCutResonances,"CutResonances/O");
 328   settingsTree->Branch("fFillpT", &fFillpT,"FillpT/O");
 329   settingsTree->Branch("fkTrackingEfficiency", "TH1D", &fkTrackingEfficiency);
 330   settingsTree->Branch("fMixingTracks", &fMixingTracks,"MixingTracks/I");
 331   settingsTree->Branch("fSkipTrigger", &fSkipTrigger,"SkipTrigger/O");
 332   settingsTree->Branch("fInjectedSignals", &fInjectedSignals,"SkipTrigger/O");
 333   settingsTree->Branch("fRejectCentralityOutliers", &fRejectCentralityOutliers,"RejectCentralityOutliers/O");
 334
 335   settingsTree->Fill();
 336   fListOfHistos->Add(settingsTree);
 337 }
 338
 339 //____________________________________________________________________
 340 void  AliAnalysisTaskPhiCorrelations::AnalyseCorrectionMode()
 341 {
 342   // Run the analysis on MC to get the correction maps
 343   //
 344
 345   if ( fDebug > 3 ) AliInfo( " Processing event in Corrections mode ..." );
 346
 347   Double_t centrality = 0;
 348
 349   if (fCentralityMethod.Length() > 0)
 350   {
 351     AliCentrality *centralityObj = 0;
 352     if (fAOD)
 353       centralityObj = fAOD->GetHeader()->GetCentralityP();
 354     else if (fESD)
 355       centralityObj = fESD->GetCentrality();
 356
 357     if (centralityObj)
 358     {
 359       centrality = centralityObj->GetCentralityPercentileUnchecked(fCentralityMethod);
 360       AliInfo(Form("Centrality is %f", centrality));
 361     }
 362     else
 363     {
 364       Printf("WARNING: Centrality object is 0");
 365       centrality = -1;
 366      }
 367   }
 368
 369   // Support for ESD and AOD based analysis
 370   AliVEvent* inputEvent = fAOD;
 371   if (!inputEvent)
 372     inputEvent = fESD;
 373
 374   Float_t bSign = 0;
 375
 376   if (inputEvent)
 377   {
 378     fHistos->SetRunNumber(inputEvent->GetRunNumber());
 379     bSign = (inputEvent->GetMagneticField() > 0) ? 1 : -1;
 380   }
 381
 382   TObject* mc = fArrayMC;
 383   if (!mc)
 384     mc = fMcEvent;
 385
 386   // count all events
 387   fHistos->FillEvent(centrality, -1);
 388
 389   // Only consider MC events within the vtx-z region used also as cut on the reconstructed vertex
 390   TObject* vertexSupplier = fMcEvent;
 391   if (fAOD) // AOD
 392     vertexSupplier = fAOD->FindListObject(AliAODMCHeader::StdBranchName());
 393
 394   if (!fAnalyseUE->VertexSelection(vertexSupplier, 0, fZVertex))
 395     return;
 396
 397   Float_t zVtx = 0;
 398   if (fAOD)
 399     zVtx = ((AliAODMCHeader*) vertexSupplier)->GetVtxZ();
 400   else
 401     zVtx = fMcEvent->GetPrimaryVertex()->GetZ();
 402   Float_t weight = 1;
 403   if (fFillpT)
 404     weight = -1;
 405
 406   // For productions with injected signals, figure out above which label to skip particles/tracks
 407   Int_t skipParticlesAbove = 0;
 408   if (fInjectedSignals)
 409   {
 410     AliGenEventHeader* eventHeader = 0;
 411     Int_t headers = 0;
 412
 413     if (fMcEvent)
 414     {
 415       // ESD
 416       AliHeader* header = (AliHeader*) fMcEvent->Header();
 417       if (!header)
 418         AliFatal("fInjectedSignals set but no MC header found");
 419
 420       AliGenCocktailEventHeader* cocktailHeader = dynamic_cast<AliGenCocktailEventHeader*> (header->GenEventHeader());
 421       if (!cocktailHeader)
 422       {
 423         header->Dump();
 424         AliFatal("fInjectedSignals set but no MC cocktail header found");
 425       }
 426
 427       headers = cocktailHeader->GetHeaders()->GetEntries();
 428       eventHeader = dynamic_cast<AliGenEventHeader*> (cocktailHeader->GetHeaders()->First());
 429     }
 430     else
 431     {
 432       // AOD
 433       AliAODMCHeader* header = (AliAODMCHeader*) fAOD->GetList()->FindObject(AliAODMCHeader::StdBranchName());
 434       if (!header)
 435         AliFatal("fInjectedSignals set but no MC header found");
 436
 437       headers = header->GetNCocktailHeaders();
 438       eventHeader = header->GetCocktailHeader(0);
 439     }
 440
 441     if (!eventHeader)
 442     {
 443       // We avoid AliFatal here, because the AOD productions sometimes have events where the MC header is missing
 444       // (due to unreadable Kinematics) and we don't want to loose the whole job because of a few events
 445       AliError("First event header not found. Skipping this event.");
 446       fHistos->FillEvent(centrality, AliUEHist::kCFStepAnaTopology);
 447       return;
 448     }
 449
 450     skipParticlesAbove = eventHeader->NProduced();
 451     AliInfo(Form("Injected signals in this event (%d headers). Keeping events of %s. Will skip particles/tracks above %d.", headers, eventHeader->ClassName(), skipParticlesAbove));
 452   }
 453
 454   // Get MC primaries
 455   TObjArray* tmpList = fAnalyseUE->GetAcceptedParticles(mc, 0, kTRUE, -1, kTRUE);
 456   if (fInjectedSignals)
 457     fAnalyseUE->RemoveInjectedSignals(tmpList, mc, skipParticlesAbove);
 458   TObjArray* tracksMC = CloneAndReduceTrackList(tmpList);
 459   delete tmpList;
 460
 461   /*
 462   if (fAOD)
 463   {
 464     for (Int_t i=0; i<fArrayMC->GetEntriesFast(); i++)
 465       ((TH1F*) fListOfHistos->FindObject("pids"))->Fill(((AliAODMCParticle*) fArrayMC->At(i))->PdgCode());
 466   }
 467   else
 468   {
 469     for (Int_t i=0; i<fMcEvent->GetNumberOfTracks(); i++)
 470       ((TH1F*) fListOfHistos->FindObject("pids"))->Fill(fMcEvent->GetTrack(i)->PdgCode());
 471   }
 472   */
 473
 474   if (fFillOnlyStep0)
 475     zVtx = 0;
 476
 477   // (MC-true all particles)
 478   // STEP 0
 479   fHistos->FillCorrelations(centrality, zVtx, AliUEHist::kCFStepAll, tracksMC, 0, weight);
 480
 481   // mixed event
 482   if (fFillMixed)
 483   {
 484     AliEventPool* pool = fPoolMgr->GetEventPool(centrality, zVtx);
 485     //pool->PrintInfo();
 486     if (pool->IsReady() || pool->NTracksInPool() > fMixingTracks / 10 || pool->GetCurrentNEvents() >= 5)
 487       for (Int_t jMix=0; jMix<pool->GetCurrentNEvents(); jMix++)
 488         fHistosMixed->FillCorrelations(centrality, zVtx, AliUEHist::kCFStepAll, tracksMC, pool->GetEvent(jMix), 1.0 / pool->GetCurrentNEvents(), (jMix == 0));
 489     pool->UpdatePool(CloneAndReduceTrackList(tracksMC));
 490   }
 491
 492 //   Printf("trigger: %d", ((AliInputEventHandler*)fInputHandler)->IsEventSelected());
 493
 494   // Trigger selection ************************************************
 495   if (!fFillOnlyStep0 && (fSkipTrigger || fAnalyseUE->TriggerSelection(fInputHandler)))
 496   {
 497     // (MC-true all particles)
 498     // STEP 1
 499     if (!fReduceMemoryFootprint)
 500       fHistos->FillCorrelations(centrality, zVtx, AliUEHist::kCFStepTriggered, tracksMC, 0, weight);
 501     else
 502       fHistos->FillEvent(centrality, AliUEHist::kCFStepTriggered);
 503
 504     if (!inputEvent) {
 505       AliFatal("UNEXPECTED: inputEvent is 0. Trigger selection should have failed");
 506       return;
 507     }
 508
 509     // Vertex selection *************************************************
 510     if (fAnalyseUE->VertexSelection(inputEvent, fnTracksVertex, fZVertex))
 511     {
 512       // fill here for tracking efficiency
 513       // loop over particle species
 514
 515       for (Int_t particleSpecies = 0; particleSpecies < 4; particleSpecies++)
 516       {
 517         TObjArray* primMCParticles = fAnalyseUE->GetAcceptedParticles(mc, 0x0, kTRUE, particleSpecies, kTRUE);
 518         TObjArray* primRecoTracksMatched = fAnalyseUE->GetAcceptedParticles(inputEvent, mc, kTRUE, particleSpecies, kTRUE);
 519         TObjArray* allRecoTracksMatched = fAnalyseUE->GetAcceptedParticles(inputEvent, mc, kFALSE, particleSpecies, kTRUE);
 520
 521         if (fInjectedSignals)
 522         {
 523           fAnalyseUE->RemoveInjectedSignals(primMCParticles, mc, skipParticlesAbove);
 524           fAnalyseUE->RemoveInjectedSignals(primRecoTracksMatched, mc, skipParticlesAbove);
 525           fAnalyseUE->RemoveInjectedSignals(allRecoTracksMatched, mc, skipParticlesAbove);
 526         }
 527
 528         fHistos->FillTrackingEfficiency(primMCParticles, primRecoTracksMatched, allRecoTracksMatched, 0, particleSpecies, centrality);
 529
 530 //      Printf("%d --> %d %d %d", particleSpecies, primMCParticles->GetEntries(), primRecoTracksMatched->GetEntries(), allRecoTracksMatched->GetEntries());
 531
 532         delete primMCParticles;
 533         delete primRecoTracksMatched;
 534         delete allRecoTracksMatched;
 535       }
 536       TObjArray* fakeParticles = fAnalyseUE->GetFakeParticles(inputEvent, mc, kFALSE, -1, kTRUE);
 537       if (fInjectedSignals)
 538       {
 539         fAnalyseUE->RemoveInjectedSignals((TObjArray*) fakeParticles->At(0), mc, skipParticlesAbove);
 540         fAnalyseUE->RemoveInjectedSignals((TObjArray*) fakeParticles->At(1), mc, skipParticlesAbove);
 541       }
 542       fHistos->FillTrackingEfficiency(0, 0, 0, (TObjArray*) fakeParticles->At(2), -1, centrality);
 543       fHistos->FillFakePt(fakeParticles, centrality);
 544       delete fakeParticles;
 545
 546       // (MC-true all particles)
 547       // STEP 2
 548       if (!fReduceMemoryFootprint)
 549         fHistos->FillCorrelations(centrality, zVtx, AliUEHist::kCFStepVertex, tracksMC, 0, weight);
 550       else
 551         fHistos->FillEvent(centrality, AliUEHist::kCFStepVertex);
 552
 553       // Get MC primaries that match reconstructed track
 554       TObjArray* tracksRecoMatchedPrim = fAnalyseUE->GetAcceptedParticles(inputEvent, mc, kTRUE, -1, kTRUE);
 555       if (fInjectedSignals)
 556         fAnalyseUE->RemoveInjectedSignals(tracksRecoMatchedPrim, mc, skipParticlesAbove);
 557
 558       // (RECO-matched (quantities from MC particle) primary particles)
 559       // STEP 4
 560       fHistos->FillCorrelations(centrality, zVtx, AliUEHist::kCFStepTrackedOnlyPrim, tracksRecoMatchedPrim, 0, weight);
 561
 562       // Get MC primaries + secondaries that match reconstructed track
 563       TObjArray* tracksRecoMatchedAll = fAnalyseUE->GetAcceptedParticles(inputEvent, mc, kFALSE, -1, kTRUE);
 564       if (fInjectedSignals)
 565         fAnalyseUE->RemoveInjectedSignals(tracksRecoMatchedAll, mc, skipParticlesAbove);
 566
 567       // (RECO-matched (quantities from MC particle) all particles)
 568       // STEP 5
 569       fHistos->FillCorrelations(centrality, zVtx, AliUEHist::kCFStepTracked, tracksRecoMatchedAll, 0, weight);
 570
 571       // Get RECO tracks
 572       TObjArray* tracks = fAnalyseUE->GetAcceptedParticles(inputEvent, 0, kTRUE, -1, kTRUE);
 573       if (fInjectedSignals)
 574         fAnalyseUE->RemoveInjectedSignals(tracks, mc, skipParticlesAbove);
 575
 576       // (RECO all tracks)
 577       // STEP 6
 578       if (!fSkipStep6)
 579         fHistos->FillCorrelations(centrality, zVtx, AliUEHist::kCFStepReconstructed, tracks, 0, weight);
 580
 581       // two track cut, STEP 8
 582       if (fTwoTrackEfficiencyCut > 0)
 583         fHistos->FillCorrelations(centrality, zVtx, AliUEHist::kCFStepBiasStudy, tracks, 0, weight, kTRUE, kTRUE, bSign, fTwoTrackEfficiencyCut);
 584
 585       // mixed event
 586       if (fFillMixed && !fSkipStep6)
 587       {
 588         AliEventPool* pool2 = fPoolMgr->GetEventPool(centrality, zVtx + 100);
 589         //pool2->PrintInfo();
 590         if (pool2->IsReady() || pool2->NTracksInPool() > fMixingTracks / 10 || pool2->GetCurrentNEvents() >= 5)
 591           for (Int_t jMix=0; jMix<pool2->GetCurrentNEvents(); jMix++)
 592           {
 593             // STEP 6
 594             fHistosMixed->FillCorrelations(centrality, zVtx, AliUEHist::kCFStepReconstructed, tracks, pool2->GetEvent(jMix), 1.0 / pool2->GetCurrentNEvents(), (jMix == 0));
 595
 596             // two track cut, STEP 8
 597             if (fTwoTrackEfficiencyCut > 0)
 598               fHistosMixed->FillCorrelations(centrality, zVtx, AliUEHist::kCFStepBiasStudy, tracks, pool2->GetEvent(jMix), 1.0 / pool2->GetCurrentNEvents(), (jMix == 0), kTRUE, bSign, fTwoTrackEfficiencyCut);
 599           }
 600         pool2->UpdatePool(CloneAndReduceTrackList(tracks));
 601       }
 602
 603       if (0 && !fReduceMemoryFootprint)
 604       {
 605         // make list of secondaries (matched with MC)
 606         TObjArray* tracksRecoMatchedSecondaries = new TObjArray;
 607         for (Int_t i=0; i<tracksRecoMatchedAll->GetEntriesFast(); i++)
 608           if (((AliAODMCParticle*)tracksRecoMatchedAll->At(i))->IsPhysicalPrimary() == kFALSE)
 609             tracksRecoMatchedSecondaries->Add(tracksRecoMatchedAll->At(i));
 610
 611         // Study: Use only secondaries as trigger particles and plot the correlation vs. all particles; store in step 9
 612         fHistos->FillCorrelations(centrality, zVtx, AliUEHist::kCFStepBiasStudy2, tracksRecoMatchedSecondaries, tracksRecoMatchedAll, weight);
 613
 614         // Study: Use only primaries as trigger particles and plot the correlation vs. secondaries; store in step 8
 615         fHistos->FillCorrelations(centrality, zVtx, AliUEHist::kCFStepBiasStudy, tracksRecoMatchedPrim, tracksRecoMatchedSecondaries, weight);
 616
 617         // plot delta phi vs process id of secondaries
 618         // trigger particles: primaries in 4 < pT < 10
 619         // associated particles: secondaries in 1 < pT < 10
 620
 621         for (Int_t i=0; i<tracksRecoMatchedPrim->GetEntriesFast(); i++)
 622         {
 623           AliVParticle* triggerParticle = (AliVParticle*) tracksRecoMatchedPrim->At(i);
 624
 625           if (triggerParticle->Pt() < 4 || triggerParticle->Pt() > 10)
 626             continue;
 627
 628           for (Int_t j=0; j<tracksRecoMatchedSecondaries->GetEntriesFast(); j++)
 629           {
 630             AliAODMCParticle* particle = (AliAODMCParticle*) tracksRecoMatchedSecondaries->At(j);
 631
 632             if (particle->Pt() < 1 || particle->Pt() > 10)
 633               continue;
 634
 635             if (particle->Pt() > triggerParticle->Pt())
 636               continue;
 637
 638             Double_t deltaPhi = triggerParticle->Phi() - particle->Phi();
 639             if (deltaPhi > 1.5 * TMath::Pi())
 640               deltaPhi -= TMath::TwoPi();
 641             if (deltaPhi < -0.5 * TMath::Pi())
 642               deltaPhi += TMath::TwoPi();
 643
 644             Int_t processID = fMcEvent->Stack()->Particle(particle->GetLabel())->GetUniqueID();
 645
 646             ((TH2F*) fListOfHistos->FindObject("processIDs"))->Fill(deltaPhi, processID);
 647           }
 648         }
 649
 650         delete tracksRecoMatchedSecondaries;
 651       }
 652
 653       delete tracksRecoMatchedPrim;
 654       delete tracksRecoMatchedAll;
 655       delete tracks;
 656     }
 657   }
 658
 659   delete tracksMC;
 660 }
 661
 662 //____________________________________________________________________
 663 void  AliAnalysisTaskPhiCorrelations::AnalyseDataMode()
 664 {
 665
 666   // Run the analysis on DATA or MC to get raw distributions
 667
 668   if ( fDebug > 3 ) AliInfo( " Processing event in Data mode ..." );
 669
 670   ((TH1F*) fListOfHistos->FindObject("eventStat"))->Fill(0);
 671
 672   if (!fInputHandler)
 673     return;
 674
 675   // skip not selected events here (the AOD is not updated for those)
 676   if (!(fInputHandler->IsEventSelected() & fSelectBit))
 677     return;
 678
 679   Double_t centrality = 0;
 680
 681   AliCentrality *centralityObj = 0;
 682   if (fCentralityMethod.Length() > 0)
 683   {
 684     if (fAOD)
 685       centralityObj = fAOD->GetHeader()->GetCentralityP();
 686     else if (fESD)
 687       centralityObj = fESD->GetCentrality();
 688
 689     if (centralityObj)
 690       centrality = centralityObj->GetCentralityPercentile(fCentralityMethod);
 691       //centrality = centralityObj->GetCentralityPercentileUnchecked(fCentralityMethod);
 692     else
 693       centrality = -1;
 694
 695     if (fAOD)
 696     {
 697       // remove outliers
 698       if (centrality == 0)
 699       {
 700         if (fAOD->GetVZEROData())
 701         {
 702           Float_t multV0 = 0;
 703           for (Int_t i=0; i<64; i++)
 704             multV0 += fAOD->GetVZEROData()->GetMultiplicity(i);
 705           if (multV0 < 19500)
 706           {
 707             centrality = -1;
 708             AliInfo("Rejecting event due to too small V0 multiplicity");
 709           }
 710         }
 711       }
 712     }
 713
 714     AliInfo(Form("Centrality is %f", centrality));
 715   }
 716
 717   // Support for ESD and AOD based analysis
 718   AliVEvent* inputEvent = fAOD;
 719   if (!inputEvent)
 720     inputEvent = fESD;
 721
 722   Float_t bSign = (inputEvent->GetMagneticField() > 0) ? 1 : -1;
 723
 724   fHistos->SetRunNumber(inputEvent->GetRunNumber());
 725
 726   // Fill the "event-counting-container", it is needed to get the number of events remaining after each event-selection cut
 727   fHistos->FillEvent(centrality, AliUEHist::kCFStepAll);
 728
 729   // Trigger selection ************************************************
 730   if (!fAnalyseUE->TriggerSelection(fInputHandler)) return;
 731
 732   // Fill the "event-counting-container", it is needed to get the number of events remaining after each event-selection cut
 733   fHistos->FillEvent(centrality, AliUEHist::kCFStepTriggered);
 734
 735   // Vertex selection *************************************************
 736   if(!fAnalyseUE->VertexSelection(inputEvent, fnTracksVertex, fZVertex)) return;
 737
 738   // Fill the "event-counting-container", it is needed to get the number of events remaining after each event-selection cut
 739   fHistos->FillEvent(centrality, AliUEHist::kCFStepVertex);
 740
 741   // optimization
 742   if (centrality < 0 && !fCompareCentralities)
 743     return;
 744
 745   TObjArray* tracks = fAnalyseUE->GetAcceptedParticles(inputEvent, 0, kTRUE, -1, kTRUE);
 746
 747   // check for outlier in centrality vs number of tracks (rough constants extracted from correlation histgram)
 748   Bool_t reject = kFALSE;
 749   if (fRejectCentralityOutliers)
 750   {
 751     if (centrality > 40 && centrality <= 50 && tracks->GetEntriesFast() > 1160)
 752       reject = kTRUE;
 753     if (centrality > 50 && centrality <= 60 && tracks->GetEntriesFast() > 650)
 754       reject = kTRUE;
 755     if (centrality > 60 && centrality <= 70 && tracks->GetEntriesFast() > 370)
 756       reject = kTRUE;
 757     if (centrality > 70 && centrality <= 80 && tracks->GetEntriesFast() > 220)
 758       reject = kTRUE;
 759     if (centrality > 80 && centrality <= 90 && tracks->GetEntriesFast() > 130)
 760       reject = kTRUE;
 761     if (centrality > 90 && tracks->GetEntriesFast() > 75)
 762       reject = kTRUE;
 763   }
 764
 765   if (reject)
 766   {
 767     AliInfo(Form("Rejecting event due to centrality vs tracks correlation: %f %d", centrality, tracks->GetEntriesFast()));
 768     fHistos->FillEvent(centrality, AliUEHist::kCFStepAnaTopology);
 769     delete tracks;
 770     return;
 771   }
 772
 773
 774   // create a list of reduced objects. This speeds up processing and reduces memory consumption for the event pool
 775   TObjArray* tracksClone = CloneAndReduceTrackList(tracks);
 776   delete tracks;
 777
 778   //Printf("Accepted %d tracks", tracks->GetEntries());
 779
 780   const AliVVertex* vertex = inputEvent->GetPrimaryVertex();
 781   Double_t zVtx = vertex->GetZ();
 782
 783   Float_t weight = 1;
 784   if (fFillpT)
 785     weight = -1;
 786
 787   // fill two different centralities (syst study)
 788   // the zvtx axis is used to distinguish the results of both centralities: configured centrality in zvtx = 0, SPD in zvtx = 2
 789   if (fCompareCentralities)
 790     zVtx = 0;
 791
 792   // Fill containers at STEP 6 (reconstructed)
 793   if (centrality >= 0)
 794   {
 795     if (!fSkipStep6)
 796       fHistos->FillCorrelations(centrality, zVtx, AliUEHist::kCFStepReconstructed, tracksClone, 0, weight);
 797
 798     ((TH1F*) fListOfHistos->FindObject("eventStat"))->Fill(1);
 799
 800     if (fTwoTrackEfficiencyCut > 0)
 801       fHistos->FillCorrelations(centrality, zVtx, AliUEHist::kCFStepBiasStudy, tracksClone, 0, weight, kTRUE, kTRUE, bSign, fTwoTrackEfficiencyCut);
 802   }
 803
 804   // fill second time with SPD centrality
 805   if (fCompareCentralities && centralityObj)
 806   {
 807     centrality = centralityObj->GetCentralityPercentile("CL1");
 808     if (centrality >= 0 && !fSkipStep6)
 809       fHistos->FillCorrelations(centrality, 2, AliUEHist::kCFStepReconstructed, tracksClone, 0, weight);
 810   }
 811
 812   if (fFillMixed)
 813   {
 814     // event mixing
 815
 816     // 1. First get an event pool corresponding in mult (cent) and
 817     //    zvertex to the current event. Once initialized, the pool
 818     //    should contain nMix (reduced) events. This routine does not
 819     //    pre-scan the chain. The first several events of every chain
 820     //    will be skipped until the needed pools are filled to the
 821     //    specified depth. If the pool categories are not too rare, this
 822     //    should not be a problem. If they are rare, you could lose
 823     //    statistics.
 824
 825     // 2. Collect the whole pool's content of tracks into one TObjArray
 826     //    (bgTracks), which is effectively a single background super-event.
 827
 828     // 3. The reduced and bgTracks arrays must both be passed into
 829     //    FillCorrelations(). Also nMix should be passed in, so a weight
 830     //    of 1./nMix can be applied.
 831
 832     AliEventPool* pool = fPoolMgr->GetEventPool(centrality, zVtx);
 833
 834     if (!pool)
 835       AliFatal(Form("No pool found for centrality = %f, zVtx = %f", centrality, zVtx));
 836
 837     //pool->SetDebug(1);
 838
 839     if (pool->IsReady() || pool->NTracksInPool() > fMixingTracks / 10 || pool->GetCurrentNEvents() >= 5)
 840     {
 841
 842       Int_t nMix = pool->GetCurrentNEvents();
 843 //       cout << "nMix = " << nMix << " tracks in pool = " << pool->NTracksInPool() << endl;
 844
 845       ((TH1F*) fListOfHistos->FindObject("eventStat"))->Fill(2);
 846       ((TH2F*) fListOfHistos->FindObject("mixedDist"))->Fill(centrality, pool->NTracksInPool());
 847       if (pool->IsReady())
 848         ((TH1F*) fListOfHistos->FindObject("eventStat"))->Fill(3);
 849
 850       // Fill mixed-event histos here
 851       for (Int_t jMix=0; jMix<nMix; jMix++)
 852       {
 853         TObjArray* bgTracks = pool->GetEvent(jMix);
 854
 855         if (!fSkipStep6)
 856           fHistosMixed->FillCorrelations(centrality, zVtx, AliUEHist::kCFStepReconstructed, tracksClone, bgTracks, 1.0 / nMix, (jMix == 0));
 857
 858         if (fTwoTrackEfficiencyCut > 0)
 859           fHistosMixed->FillCorrelations(centrality, zVtx, AliUEHist::kCFStepBiasStudy, tracksClone, bgTracks, 1.0 / nMix, (jMix == 0), kTRUE, bSign, fTwoTrackEfficiencyCut);
 860       }
 861     }
 862
 863     // ownership is with the pool now
 864     pool->UpdatePool(tracksClone);
 865     //pool->PrintInfo();
 866   }
 867   else
 868     delete tracksClone;
 869 }
 870
 871 TObjArray* AliAnalysisTaskPhiCorrelations::CloneAndReduceTrackList(TObjArray* tracks)
 872 {
 873   // clones a track list by using AliDPhiBasicParticle which uses much less memory (used for event mixing)
 874
 875   TObjArray* tracksClone = new TObjArray;
 876   tracksClone->SetOwner(kTRUE);
 877
 878   for (Int_t i=0; i<tracks->GetEntriesFast(); i++)
 879   {
 880     AliVParticle* particle = (AliVParticle*) tracks->At(i);
 881     tracksClone->Add(new AliDPhiBasicParticle(particle->Eta(), particle->Phi(), particle->Pt(), particle->Charge()));
 882   }
 883
 884   return tracksClone;
 885 }
 886
 887 //____________________________________________________________________
 888 void  AliAnalysisTaskPhiCorrelations::Initialize()
 889 {
 890   // input handler
 891   fInputHandler = (AliInputEventHandler*)
 892          ((AliAnalysisManager::GetAnalysisManager())->GetInputEventHandler());
 893   // MC handler
 894   fMcHandler = dynamic_cast<AliMCEventHandler*> (AliAnalysisManager::GetAnalysisManager()->GetMCtruthEventHandler());
 895 }