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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  15
  16 /* $Id:$ */
  17
  18 #include <TROOT.h>
  19 #include <TChain.h>
  20 #include <TFile.h>
  21 #include <TList.h>
  22 #include <TMath.h>
  23 #include <TTree.h>
  24 #include <TH2F.h>
  25 #include <TRandom.h>
  26
  27 #include "AliAnalysisTaskPhiCorrelations.h"
  28 #include "AliAnalyseLeadingTrackUE.h"
  29 #include "AliUEHistograms.h"
  30 #include "AliUEHist.h"
  31
  32 #include "AliAnalysisManager.h"
  33 #include "AliAODHandler.h"
  34 #include "AliAODInputHandler.h"
  35 #include "AliAODMCParticle.h"
  36 #include "AliInputEventHandler.h"
  37 #include "AliLog.h"
  38 #include "AliMCEventHandler.h"
  39 #include "AliVParticle.h"
  40 #include "AliCFContainer.h"
  41
  42 #include "AliESDEvent.h"
  43 #include "AliESDInputHandler.h"
  44 #include "AliMultiplicity.h"
  45 #include "AliCentrality.h"
  46 #include "AliStack.h"
  47 #include "AliAODMCHeader.h"
  48
  49 #include "AliEventPoolManager.h"
  50
  51
  52 ////////////////////////////////////////////////////////////////////////
  53 //
  54 // Analysis class for azimuthal correlation studies
  55 // Based on the UE task from Sara Vallero and Jan Fiete
  56 //
  57 // This class needs input AODs.
  58 // The output is a list of analysis-specific containers.
  59 //
  60 // The AOD can be either connected to the InputEventHandler
  61 // for a chain of AOD files
  62 // or
  63 // to the OutputEventHandler
  64 // for a chain of ESD files,
  65 // in this case the class should be in the train after the jet-finder
  66 //
  67 //    Authors:
  68 //    Jan Fiete Grosse-Oetringhaus
  69 //
  70 ////////////////////////////////////////////////////////////////////////
  71
  72
  73 ClassImp( AliAnalysisTaskPhiCorrelations )
  74 ClassImp( AliDPhiBasicParticle )
  75
  76 //____________________________________________________________________
  77 AliAnalysisTaskPhiCorrelations:: AliAnalysisTaskPhiCorrelations(const char* name):
  78 AliAnalysisTask(name,""),
  79 // general configuration
  80 fDebug(0),
  81 fMode(0),
  82 fReduceMemoryFootprint(kFALSE),
  83 fFillMixed(kTRUE),
  84 fMixingTracks(50000),
  85 fCompareCentralities(kFALSE),
  86 fTwoTrackEfficiencyStudy(kFALSE),
  87 fTwoTrackEfficiencyCut(kFALSE),
  88 fUseVtxAxis(kFALSE),
  89 fSkipTrigger(kFALSE),
  90 // pointers to UE classes
  91 fAnalyseUE(0x0),
  92 fHistos(0x0),
  93 fHistosMixed(0),
  94 fkTrackingEfficiency(0x0),
  95 // handlers and events
  96 fAOD(0x0),
  97 fESD(0x0),
  98 fArrayMC(0x0),
  99 fInputHandler(0x0),
 100 fMcEvent(0x0),
 101 fMcHandler(0x0),
 102 fPoolMgr(0x0),
 103 // histogram settings
 104 fListOfHistos(0x0),
 105 // event QA
 106 fnTracksVertex(1),  // QA tracks pointing to principal vertex (= 3 default)
 107 fZVertex(7.),
 108 fCentralityMethod("V0M"),
 109 // track cuts
 110 fTrackEtaCut(0.8),
 111 fPtMin(0.5),
 112 fFilterBit(0xFF),
 113 fSelectBit(0),
 114 fUseChargeHadrons(kFALSE),
 115 fSelectCharge(0),
 116 fTriggerRestrictEta(-1),
 117 fEtaOrdering(kFALSE),
 118 fCutConversions(kFALSE),
 119 fCutResonances(kFALSE),
 120 fFillOnlyStep0(kFALSE),
 121 fSkipStep6(kFALSE),
 122 fFillpT(kFALSE)
 123 {
 124   // Default constructor
 125   // Define input and output slots here
 126   // Input slot #0 works with a TChain
 127   DefineInput(0, TChain::Class());
 128   // Output slot #0 writes into a TList container
 129   DefineOutput(0, TList::Class());
 130 }
 131
 132 AliAnalysisTaskPhiCorrelations::~AliAnalysisTaskPhiCorrelations()
 133 {
 134   // destructor
 135
 136   if (fListOfHistos  && !AliAnalysisManager::GetAnalysisManager()->IsProofMode())
 137     delete fListOfHistos;
 138 }
 139
 140 //____________________________________________________________________
 141 void AliAnalysisTaskPhiCorrelations::ConnectInputData(Option_t* /*option*/)
 142 {
 143
 144   // Connect the input data
 145   if (fDebug > 1) AliInfo("ConnectInputData() ");
 146
 147   // Since AODs can either be connected to the InputEventHandler
 148   // or to the OutputEventHandler ( the AOD is created by a previus task in the train )
 149   // we need to get the pointer to the AODEvent correctly.
 150
 151   // Delta AODs are also accepted.
 152
 153   TObject* handler = AliAnalysisManager::GetAnalysisManager()->GetInputEventHandler();
 154
 155   if( handler && handler->InheritsFrom("AliAODInputHandler") )
 156   { // input AOD
 157     fAOD = ((AliAODInputHandler*)handler)->GetEvent();
 158     if (fDebug > 1) AliInfo(" ==== Tracks and Jets from AliAODInputHandler");
 159   }
 160   else
 161   {  //output AOD
 162     handler = AliAnalysisManager::GetAnalysisManager()->GetOutputEventHandler();
 163     if (handler && handler->InheritsFrom("AliAODHandler") )
 164     {
 165       fAOD = ((AliAODHandler*)handler)->GetAOD();
 166       if (fDebug > 1) AliInfo(" ==== Tracks and Jets from AliAODHandler");
 167     }
 168     else
 169     {  // no AOD
 170       AliWarning("I can't get any AOD Event Handler");
 171     }
 172   }
 173
 174   if (handler && handler->InheritsFrom("AliESDInputHandler") )
 175   { // input ESD
 176     // pointer received per event in ::Exec
 177     if (fDebug > 1) AliInfo(" ==== Tracks and Jets from AliESDInputHandler");
 178   }
 179
 180   // Initialize common pointers
 181   Initialize();
 182 }
 183
 184 //____________________________________________________________________
 185 void  AliAnalysisTaskPhiCorrelations::CreateOutputObjects()
 186 {
 187   // Create the output container
 188
 189   if (fDebug > 1) AliInfo("CreateOutputObjects()");
 190
 191   // Initialize class with main algorithms, event and track selection.
 192   fAnalyseUE = new AliAnalyseLeadingTrackUE();
 193   fAnalyseUE->SetParticleSelectionCriteria(fFilterBit, fUseChargeHadrons, fTrackEtaCut, fPtMin);
 194   fAnalyseUE->SetDebug(fDebug);
 195   fAnalyseUE->DefineESDCuts(fFilterBit);
 196
 197   // Initialize output list of containers
 198   if (fListOfHistos != NULL){
 199         delete fListOfHistos;
 200         fListOfHistos = NULL;
 201         }
 202   if (!fListOfHistos){
 203         fListOfHistos = new TList();
 204         fListOfHistos->SetOwner(kTRUE);
 205         }
 206
 207   // Initialize class to handle histograms
 208   const char* histType = "4";
 209   if (fUseVtxAxis)
 210     histType = "5";
 211   fHistos = new AliUEHistograms("AliUEHistogramsSame", histType);
 212   fHistosMixed = new AliUEHistograms("AliUEHistogramsMixed", histType);
 213
 214   fHistos->SetSelectCharge(fSelectCharge);
 215   fHistosMixed->SetSelectCharge(fSelectCharge);
 216
 217   fHistos->SetTriggerRestrictEta(fTriggerRestrictEta);
 218   fHistosMixed->SetTriggerRestrictEta(fTriggerRestrictEta);
 219
 220   fHistos->SetEtaOrdering(fEtaOrdering);
 221   fHistosMixed->SetEtaOrdering(fEtaOrdering);
 222
 223   fHistos->SetPairCuts(fCutConversions, fCutResonances);
 224   fHistosMixed->SetPairCuts(fCutConversions, fCutResonances);
 225
 226   // add histograms to list
 227   fListOfHistos->Add(fHistos);
 228   fListOfHistos->Add(fHistosMixed);
 229
 230   fListOfHistos->Add(new TH2F("trackletsVsV0Cent", ";L1 clusters;v0 centrality", 100, -0.5, 9999.5, 101, 0, 101));
 231   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));
 232   fListOfHistos->Add(new TH1F("eventStat", ";;events", 4, -0.5, 3.5));
 233   fListOfHistos->Add(new TH2F("mixedDist", ";centrality;tracks;events", 101, 0, 101, 200, 0, fMixingTracks * 1.5));
 234   fListOfHistos->Add(new TH1F("pids", ";pdg;tracks", 2001, -1000.5, 1000.5));
 235
 236   PostData(0,fListOfHistos);
 237
 238   // Add task configuration to output list
 239   AddSettingsTree();
 240
 241   // event mixing
 242   Int_t trackDepth = fMixingTracks;
 243   Int_t poolsize   = 1000;  // Maximum number of events, ignored in the present implemented of AliEventPool
 244
 245   Int_t nCentralityBins  = fHistos->GetUEHist(2)->GetEventHist()->GetNBins(1);
 246   Double_t* centralityBins = (Double_t*) fHistos->GetUEHist(2)->GetEventHist()->GetAxis(1, 0)->GetXbins()->GetArray();
 247
 248   Int_t nZvtxBins  = 7+1+7;
 249   // bins for second buffer are shifted by 100 cm
 250   Double_t vertexBins[] = { -7, -5, -3, -1, 1, 3, 5, 7, 93, 95, 97, 99, 101, 103, 105, 107 };
 251   Double_t* zvtxbin = vertexBins;
 252
 253   if (fHistos->GetUEHist(2)->GetEventHist()->GetNVar() > 2)
 254   {
 255     nZvtxBins = fHistos->GetUEHist(2)->GetEventHist()->GetNBins(2);
 256     zvtxbin = (Double_t*) fHistos->GetUEHist(2)->GetEventHist()->GetAxis(2, 0)->GetXbins()->GetArray();
 257   }
 258
 259   fPoolMgr = new AliEventPoolManager(poolsize, trackDepth, nCentralityBins, centralityBins, nZvtxBins, zvtxbin);
 260 }
 261
 262 //____________________________________________________________________
 263 void  AliAnalysisTaskPhiCorrelations::Exec(Option_t */*option*/)
 264 {
 265   // receive ESD pointer if we are not running AOD analysis
 266   if (!fAOD)
 267   {
 268     AliVEventHandler* handler = AliAnalysisManager::GetAnalysisManager()->GetInputEventHandler();
 269     if (handler && handler->InheritsFrom("AliESDInputHandler"))
 270       fESD = ((AliESDInputHandler*)handler)->GetEvent();
 271   }
 272
 273   if (fMode)
 274   {
 275     // correction mode
 276
 277     if (fMcHandler)
 278       fMcEvent = fMcHandler->MCEvent();
 279
 280     if (fAOD)
 281     {
 282       // array of MC particles
 283       fArrayMC = dynamic_cast<TClonesArray*>(fAOD->FindListObject(AliAODMCParticle::StdBranchName()));
 284       if (!fArrayMC)
 285         AliFatal("No array of MC particles found !!!");
 286     }
 287
 288     AnalyseCorrectionMode();
 289   }
 290   else AnalyseDataMode();
 291 }
 292
 293 /******************** ANALYSIS METHODS *****************************/
 294
 295 //____________________________________________________________________
 296 void  AliAnalysisTaskPhiCorrelations::AddSettingsTree()
 297 {
 298   //Write settings to output list
 299   TTree *settingsTree   = new TTree("UEAnalysisSettings","Analysis Settings in UE estimation");
 300   settingsTree->Branch("fnTracksVertex", &fnTracksVertex,"nTracksVertex/I");
 301   settingsTree->Branch("fZVertex", &fZVertex,"ZVertex/D");
 302   //settingsTree->Branch("fCentralityMethod", fCentralityMethod.Data(),"CentralityMethod/C");
 303   settingsTree->Branch("fTrackEtaCut", &fTrackEtaCut, "TrackEtaCut/D");
 304   settingsTree->Branch("fPtMin", &fPtMin, "PtMin/D");
 305   settingsTree->Branch("fFilterBit", &fFilterBit,"FilterBit/I");
 306   settingsTree->Branch("fSelectBit", &fSelectBit,"EventSelectionBit/I");
 307   settingsTree->Branch("fUseChargeHadrons", &fUseChargeHadrons,"UseChHadrons/O");
 308   settingsTree->Branch("fSelectCharge", &fSelectCharge,"SelectCharge/I");
 309   settingsTree->Branch("fTriggerRestrictEta", &fTriggerRestrictEta,"TriggerRestrictEta/D");
 310   settingsTree->Branch("fEtaOrdering", &fEtaOrdering,"EtaOrdering/O");
 311   settingsTree->Branch("fCutConversions", &fCutConversions,"CutConversions/O");
 312   settingsTree->Branch("fCutResonances", &fCutResonances,"CutResonances/O");
 313   settingsTree->Branch("fFillpT", &fFillpT,"FillpT/O");
 314   settingsTree->Branch("fkTrackingEfficiency", "TH1D", &fkTrackingEfficiency);
 315   settingsTree->Branch("fMixingTracks", &fMixingTracks,"MixingTracks/I");
 316   settingsTree->Branch("fSkipTrigger", &fSkipTrigger,"SkipTrigger/O");
 317
 318   settingsTree->Fill();
 319   fListOfHistos->Add(settingsTree);
 320 }
 321
 322 //____________________________________________________________________
 323 void  AliAnalysisTaskPhiCorrelations::AnalyseCorrectionMode()
 324 {
 325   // Run the analysis on MC to get the correction maps
 326   //
 327
 328   if ( fDebug > 3 ) AliInfo( " Processing event in Corrections mode ..." );
 329
 330   Double_t centrality = 0;
 331
 332   if (fCentralityMethod.Length() > 0)
 333   {
 334     AliCentrality *centralityObj = 0;
 335     if (fAOD)
 336       centralityObj = fAOD->GetHeader()->GetCentralityP();
 337     else if (fESD)
 338       centralityObj = fESD->GetCentrality();
 339
 340     if (centralityObj)
 341     {
 342       centrality = centralityObj->GetCentralityPercentileUnchecked(fCentralityMethod);
 343       AliInfo(Form("Centrality is %f", centrality));
 344     }
 345     else
 346     {
 347       Printf("WARNING: Centrality object is 0");
 348       centrality = -1;
 349      }
 350   }
 351
 352   // Support for ESD and AOD based analysis
 353   AliVEvent* inputEvent = fAOD;
 354   if (!inputEvent)
 355     inputEvent = fESD;
 356
 357   fHistos->SetRunNumber(inputEvent->GetRunNumber());
 358
 359   TObject* mc = fArrayMC;
 360   if (!mc)
 361     mc = fMcEvent;
 362
 363   // count all events
 364   fHistos->FillEvent(centrality, -1);
 365
 366   // Only consider MC events within the vtx-z region used also as cut on the reconstructed vertex
 367   TObject* vertexSupplier = fMcEvent;
 368   if (fAOD) // AOD
 369     vertexSupplier = fAOD->FindListObject(AliAODMCHeader::StdBranchName());
 370
 371   if (!fAnalyseUE->VertexSelection(vertexSupplier, 0, fZVertex))
 372     return;
 373
 374   Float_t zVtx = 0;
 375   if (fAOD)
 376     zVtx = ((AliAODMCHeader*) vertexSupplier)->GetVtxZ();
 377   else
 378     zVtx = fMcEvent->GetPrimaryVertex()->GetZ();
 379   Float_t weight = 1;
 380   if (fFillpT)
 381     weight = -1;
 382
 383   // Get MC primaries
 384   TObjArray* tracksMC = fAnalyseUE->GetAcceptedParticles(mc, 0, kTRUE, -1, kTRUE);
 385
 386   if (fAOD)
 387   {
 388     for (Int_t i=0; i<fArrayMC->GetEntriesFast(); i++)
 389       ((TH1F*) fListOfHistos->FindObject("pids"))->Fill(((AliAODMCParticle*) fArrayMC->At(i))->PdgCode());
 390   }
 391   else
 392   {
 393     for (Int_t i=0; i<fMcEvent->GetNumberOfTracks(); i++)
 394       ((TH1F*) fListOfHistos->FindObject("pids"))->Fill(fMcEvent->GetTrack(i)->PdgCode());
 395   }
 396
 397   // (MC-true all particles)
 398   // STEP 0
 399   fHistos->FillCorrelations(centrality, zVtx, AliUEHist::kCFStepAll, tracksMC, 0, weight);
 400
 401   // mixed event
 402   if (fFillMixed)
 403   {
 404     AliEventPool* pool = fPoolMgr->GetEventPool(centrality, zVtx);
 405     //pool->PrintInfo();
 406     if (pool->IsReady() || pool->NTracksInPool() > fMixingTracks / 10 || pool->GetCurrentNEvents() >= 5)
 407       for (Int_t jMix=0; jMix<pool->GetCurrentNEvents(); jMix++)
 408         fHistosMixed->FillCorrelations(centrality, zVtx, AliUEHist::kCFStepAll, tracksMC, pool->GetEvent(jMix), 1.0 / pool->GetCurrentNEvents(), (jMix == 0));
 409     pool->UpdatePool(CloneAndReduceTrackList(tracksMC));
 410   }
 411
 412 //   Printf("trigger: %d", ((AliInputEventHandler*)fInputHandler)->IsEventSelected());
 413
 414   // Trigger selection ************************************************
 415   if (!fFillOnlyStep0 && (fSkipTrigger || fAnalyseUE->TriggerSelection(fInputHandler)))
 416   {
 417     // (MC-true all particles)
 418     // STEP 1
 419     if (!fReduceMemoryFootprint)
 420       fHistos->FillCorrelations(centrality, zVtx, AliUEHist::kCFStepTriggered, tracksMC, 0, weight);
 421     else
 422       fHistos->FillEvent(centrality, AliUEHist::kCFStepTriggered);
 423
 424     if (!inputEvent) {
 425       AliFatal("UNEXPECTED: inputEvent is 0. Trigger selection should have failed");
 426       return;
 427     }
 428
 429     // Vertex selection *************************************************
 430     if (fAnalyseUE->VertexSelection(inputEvent, fnTracksVertex, fZVertex))
 431     {
 432       // fill here for tracking efficiency
 433       // loop over particle species
 434
 435       for (Int_t particleSpecies = 0; particleSpecies < 4; particleSpecies++)
 436       {
 437         TObjArray* primMCParticles = fAnalyseUE->GetAcceptedParticles(mc, 0x0, kTRUE, particleSpecies, kTRUE);
 438         TObjArray* primRecoTracksMatched = fAnalyseUE->GetAcceptedParticles(inputEvent, mc, kTRUE, particleSpecies, kTRUE);
 439         TObjArray* allRecoTracksMatched = fAnalyseUE->GetAcceptedParticles(inputEvent, mc, kFALSE, particleSpecies, kTRUE);
 440
 441         fHistos->FillTrackingEfficiency(primMCParticles, primRecoTracksMatched, allRecoTracksMatched, particleSpecies, centrality);
 442
 443 //      Printf("%d --> %d %d %d", particleSpecies, primMCParticles->GetEntries(), primRecoTracksMatched->GetEntries(), allRecoTracksMatched->GetEntries());
 444
 445         delete primMCParticles;
 446         delete primRecoTracksMatched;
 447         delete allRecoTracksMatched;
 448       }
 449
 450       // (MC-true all particles)
 451       // STEP 2
 452       if (!fReduceMemoryFootprint)
 453         fHistos->FillCorrelations(centrality, zVtx, AliUEHist::kCFStepVertex, tracksMC, 0, weight);
 454       else
 455         fHistos->FillEvent(centrality, AliUEHist::kCFStepVertex);
 456
 457       // Get MC primaries that match reconstructed track
 458       TObjArray* tracksRecoMatchedPrim = fAnalyseUE->GetAcceptedParticles(inputEvent, mc, kTRUE, -1, kTRUE);
 459
 460       // (RECO-matched (quantities from MC particle) primary particles)
 461       // STEP 4
 462       fHistos->FillCorrelations(centrality, zVtx, AliUEHist::kCFStepTrackedOnlyPrim, tracksRecoMatchedPrim, 0, weight);
 463
 464       // Get MC primaries + secondaries that match reconstructed track
 465       TObjArray* tracksRecoMatchedAll = fAnalyseUE->GetAcceptedParticles(inputEvent, mc, kFALSE, -1, kTRUE);
 466
 467       // (RECO-matched (quantities from MC particle) all particles)
 468       // STEP 5
 469       fHistos->FillCorrelations(centrality, zVtx, AliUEHist::kCFStepTracked, tracksRecoMatchedAll, 0, weight);
 470
 471       // Get RECO tracks
 472       TObjArray* tracks = fAnalyseUE->GetAcceptedParticles(inputEvent, 0, kTRUE, -1, kTRUE);
 473
 474       // (RECO all tracks)
 475       // STEP 6
 476       if (!fSkipStep6)
 477         fHistos->FillCorrelations(centrality, zVtx, AliUEHist::kCFStepReconstructed, tracks, 0, weight);
 478
 479       // mixed event
 480       if (fFillMixed && !fSkipStep6)
 481       {
 482         AliEventPool* pool2 = fPoolMgr->GetEventPool(centrality, zVtx + 100);
 483         //pool2->PrintInfo();
 484         if (pool2->IsReady() || pool2->NTracksInPool() > fMixingTracks / 10 || pool2->GetCurrentNEvents() >= 5)
 485           for (Int_t jMix=0; jMix<pool2->GetCurrentNEvents(); jMix++)
 486             fHistosMixed->FillCorrelations(centrality, zVtx, AliUEHist::kCFStepReconstructed, tracks, pool2->GetEvent(jMix), 1.0 / pool2->GetCurrentNEvents(), (jMix == 0));
 487         pool2->UpdatePool(CloneAndReduceTrackList(tracks));
 488       }
 489
 490       if (0 && !fReduceMemoryFootprint)
 491       {
 492         // make list of secondaries (matched with MC)
 493         TObjArray* tracksRecoMatchedSecondaries = new TObjArray;
 494         for (Int_t i=0; i<tracksRecoMatchedAll->GetEntriesFast(); i++)
 495           if (((AliAODMCParticle*)tracksRecoMatchedAll->At(i))->IsPhysicalPrimary() == kFALSE)
 496             tracksRecoMatchedSecondaries->Add(tracksRecoMatchedAll->At(i));
 497
 498         // Study: Use only secondaries as trigger particles and plot the correlation vs. all particles; store in step 9
 499         fHistos->FillCorrelations(centrality, zVtx, AliUEHist::kCFStepBiasStudy2, tracksRecoMatchedSecondaries, tracksRecoMatchedAll, weight);
 500
 501         // Study: Use only primaries as trigger particles and plot the correlation vs. secondaries; store in step 8
 502         fHistos->FillCorrelations(centrality, zVtx, AliUEHist::kCFStepBiasStudy, tracksRecoMatchedPrim, tracksRecoMatchedSecondaries, weight);
 503
 504         // plot delta phi vs process id of secondaries
 505         // trigger particles: primaries in 4 < pT < 10
 506         // associated particles: secondaries in 1 < pT < 10
 507
 508         for (Int_t i=0; i<tracksRecoMatchedPrim->GetEntriesFast(); i++)
 509         {
 510           AliVParticle* triggerParticle = (AliVParticle*) tracksRecoMatchedPrim->At(i);
 511
 512           if (triggerParticle->Pt() < 4 || triggerParticle->Pt() > 10)
 513             continue;
 514
 515           for (Int_t j=0; j<tracksRecoMatchedSecondaries->GetEntriesFast(); j++)
 516           {
 517             AliAODMCParticle* particle = (AliAODMCParticle*) tracksRecoMatchedSecondaries->At(j);
 518
 519             if (particle->Pt() < 1 || particle->Pt() > 10)
 520               continue;
 521
 522             if (particle->Pt() > triggerParticle->Pt())
 523               continue;
 524
 525             Double_t deltaPhi = triggerParticle->Phi() - particle->Phi();
 526             if (deltaPhi > 1.5 * TMath::Pi())
 527               deltaPhi -= TMath::TwoPi();
 528             if (deltaPhi < -0.5 * TMath::Pi())
 529               deltaPhi += TMath::TwoPi();
 530
 531             Int_t processID = fMcEvent->Stack()->Particle(particle->GetLabel())->GetUniqueID();
 532
 533             ((TH2F*) fListOfHistos->FindObject("processIDs"))->Fill(deltaPhi, processID);
 534           }
 535         }
 536
 537         delete tracksRecoMatchedSecondaries;
 538       }
 539
 540       delete tracksRecoMatchedPrim;
 541       delete tracksRecoMatchedAll;
 542       delete tracks;
 543     }
 544   }
 545
 546   delete tracksMC;
 547 }
 548
 549 //____________________________________________________________________
 550 void  AliAnalysisTaskPhiCorrelations::AnalyseDataMode()
 551 {
 552
 553   // Run the analysis on DATA or MC to get raw distributions
 554
 555   if ( fDebug > 3 ) AliInfo( " Processing event in Data mode ..." );
 556
 557   ((TH1F*) fListOfHistos->FindObject("eventStat"))->Fill(0);
 558
 559   // skip not selected events here (the AOD is not updated for those)
 560   if (!fInputHandler)
 561     return;
 562
 563   if (!(fInputHandler->IsEventSelected() & (AliVEvent::kMB | AliVEvent::kUserDefined)))
 564     return;
 565
 566   Double_t centrality = 0;
 567
 568   AliCentrality *centralityObj = 0;
 569   if (fCentralityMethod.Length() > 0)
 570   {
 571     if (fAOD)
 572       centralityObj = fAOD->GetHeader()->GetCentralityP();
 573     else if (fESD)
 574       centralityObj = fESD->GetCentrality();
 575
 576     if (centralityObj)
 577       centrality = centralityObj->GetCentralityPercentile(fCentralityMethod);
 578       //centrality = centralityObj->GetCentralityPercentileUnchecked(fCentralityMethod);
 579     else
 580       centrality = -1;
 581
 582     if (fAOD)
 583     {
 584       // remove outliers
 585       if (centrality == 0)
 586       {
 587         if (fAOD->GetVZEROData())
 588         {
 589           Float_t multV0 = 0;
 590           for (Int_t i=0; i<64; i++)
 591             multV0 += fAOD->GetVZEROData()->GetMultiplicity(i);
 592           if (multV0 < 19500)
 593           {
 594             centrality = -1;
 595             AliInfo("Rejecting event due to too small V0 multiplicity");
 596           }
 597         }
 598       }
 599     }
 600
 601     AliInfo(Form("Centrality is %f", centrality));
 602   }
 603
 604   // Support for ESD and AOD based analysis
 605   AliVEvent* inputEvent = fAOD;
 606   if (!inputEvent)
 607     inputEvent = fESD;
 608
 609   Float_t bSign = (inputEvent->GetMagneticField() > 0) ? 1 : -1;
 610
 611   fHistos->SetRunNumber(inputEvent->GetRunNumber());
 612
 613   // Fill the "event-counting-container", it is needed to get the number of events remaining after each event-selection cut
 614   fHistos->FillEvent(centrality, AliUEHist::kCFStepAll);
 615
 616   // Trigger selection ************************************************
 617   if (!fAnalyseUE->TriggerSelection(fInputHandler)) return;
 618
 619   // Fill the "event-counting-container", it is needed to get the number of events remaining after each event-selection cut
 620   fHistos->FillEvent(centrality, AliUEHist::kCFStepTriggered);
 621
 622   // Vertex selection *************************************************
 623   if(!fAnalyseUE->VertexSelection(inputEvent, fnTracksVertex, fZVertex)) return;
 624
 625   // Fill the "event-counting-container", it is needed to get the number of events remaining after each event-selection cut
 626   fHistos->FillEvent(centrality, AliUEHist::kCFStepVertex);
 627
 628   // optimization
 629   if (centrality < 0 && !fCompareCentralities)
 630     return;
 631
 632   TObjArray* tracks = fAnalyseUE->GetAcceptedParticles(inputEvent, 0, kTRUE, -1, kTRUE);
 633   // create a list of reduced objects. This speeds up processing and reduces memory consumption for the event pool
 634   TObjArray* tracksClone = CloneAndReduceTrackList(tracks);
 635   delete tracks;
 636
 637   //Printf("Accepted %d tracks", tracks->GetEntries());
 638
 639   const AliVVertex* vertex = inputEvent->GetPrimaryVertex();
 640   Double_t zVtx = vertex->GetZ();
 641
 642   Float_t weight = 1;
 643   if (fFillpT)
 644     weight = -1;
 645
 646   // fill two different centralities (syst study)
 647   // the zvtx axis is used to distinguish the results of both centralities: configured centrality in zvtx = 0, SPD in zvtx = 2
 648   if (fCompareCentralities)
 649     zVtx = 0;
 650
 651   // Fill containers at STEP 6 (reconstructed)
 652   if (centrality >= 0)
 653   {
 654     if (!fSkipStep6)
 655       fHistos->FillCorrelations(centrality, zVtx, AliUEHist::kCFStepReconstructed, tracksClone, 0, weight);
 656
 657     ((TH1F*) fListOfHistos->FindObject("eventStat"))->Fill(1);
 658
 659     if (fTwoTrackEfficiencyCut)
 660       fHistos->FillCorrelations(centrality, zVtx, AliUEHist::kCFStepBiasStudy, tracksClone, 0, weight, kTRUE, kTRUE, bSign);
 661   }
 662
 663   // fill second time with SPD centrality
 664   if (fCompareCentralities && centralityObj)
 665   {
 666     centrality = centralityObj->GetCentralityPercentile("CL1");
 667     if (centrality >= 0 && !fSkipStep6)
 668       fHistos->FillCorrelations(centrality, 2, AliUEHist::kCFStepReconstructed, tracksClone, 0, weight);
 669   }
 670
 671   if (fFillMixed)
 672   {
 673     // event mixing
 674
 675     // 1. First get an event pool corresponding in mult (cent) and
 676     //    zvertex to the current event. Once initialized, the pool
 677     //    should contain nMix (reduced) events. This routine does not
 678     //    pre-scan the chain. The first several events of every chain
 679     //    will be skipped until the needed pools are filled to the
 680     //    specified depth. If the pool categories are not too rare, this
 681     //    should not be a problem. If they are rare, you could lose
 682     //    statistics.
 683
 684     // 2. Collect the whole pool's content of tracks into one TObjArray
 685     //    (bgTracks), which is effectively a single background super-event.
 686
 687     // 3. The reduced and bgTracks arrays must both be passed into
 688     //    FillCorrelations(). Also nMix should be passed in, so a weight
 689     //    of 1./nMix can be applied.
 690
 691     AliEventPool* pool = fPoolMgr->GetEventPool(centrality, zVtx);
 692
 693     if (!pool)
 694       AliFatal(Form("No pool found for centrality = %f, zVtx = %f", centrality, zVtx));
 695
 696     //pool->SetDebug(1);
 697
 698     if (pool->IsReady() || pool->NTracksInPool() > fMixingTracks / 10 || pool->GetCurrentNEvents() >= 5)
 699     {
 700
 701       Int_t nMix = pool->GetCurrentNEvents();
 702 //       cout << "nMix = " << nMix << " tracks in pool = " << pool->NTracksInPool() << endl;
 703
 704       ((TH1F*) fListOfHistos->FindObject("eventStat"))->Fill(2);
 705       ((TH2F*) fListOfHistos->FindObject("mixedDist"))->Fill(centrality, pool->NTracksInPool());
 706       if (pool->IsReady())
 707         ((TH1F*) fListOfHistos->FindObject("eventStat"))->Fill(3);
 708
 709       // Fill mixed-event histos here
 710       for (Int_t jMix=0; jMix<nMix; jMix++)
 711       {
 712         TObjArray* bgTracks = pool->GetEvent(jMix);
 713
 714         if (!fSkipStep6)
 715           fHistosMixed->FillCorrelations(centrality, zVtx, AliUEHist::kCFStepReconstructed, tracksClone, bgTracks, 1.0 / nMix, (jMix == 0));
 716
 717         if (fTwoTrackEfficiencyCut)
 718           fHistosMixed->FillCorrelations(centrality, zVtx, AliUEHist::kCFStepBiasStudy, tracksClone, bgTracks, 1.0 / nMix, (jMix == 0), kTRUE, bSign);
 719       }
 720     }
 721
 722     // ownership is with the pool now
 723     pool->UpdatePool(tracksClone);
 724     //pool->PrintInfo();
 725   }
 726   else
 727     delete tracksClone;
 728 }
 729
 730 TObjArray* AliAnalysisTaskPhiCorrelations::CloneAndReduceTrackList(TObjArray* tracks)
 731 {
 732   // clones a track list by using AliDPhiBasicParticle which uses much less memory (used for event mixing)
 733
 734   TObjArray* tracksClone = new TObjArray;
 735   tracksClone->SetOwner(kTRUE);
 736
 737   for (Int_t i=0; i<tracks->GetEntriesFast(); i++)
 738   {
 739     AliVParticle* particle = (AliVParticle*) tracks->At(i);
 740     tracksClone->Add(new AliDPhiBasicParticle(particle->Eta(), particle->Phi(), particle->Pt(), particle->Charge()));
 741   }
 742
 743   return tracksClone;
 744 }
 745
 746 //____________________________________________________________________
 747 void  AliAnalysisTaskPhiCorrelations::Initialize()
 748 {
 749   // input handler
 750   fInputHandler = (AliInputEventHandler*)
 751          ((AliAnalysisManager::GetAnalysisManager())->GetInputEventHandler());
 752   // MC handler
 753   fMcHandler = dynamic_cast<AliMCEventHandler*> (AliAnalysisManager::GetAnalysisManager()->GetMCtruthEventHandler());
 754 }