PWGCF/Correlations/DPhi/AliAnalysisTaskPhiCorrelations.cxx

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