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.                                    *
   5  * Contributors are mentioned in the code where appropriate.              *
   6  *                                                                        *
   7  * Permission to use, copy, modify and distribute this software and its   *
   8  * documentation strictly for non-commercial purposes is hereby granted   *
   9  * without fee, provided that the above copyright notice appears in all   *
  10  * copies and that both the copyright notice and this permission notice   *
  11  * appear in the supporting documentation. The authors make no claims     *
  12  * about the suitability of this software for any purpose. It is          *
  13  * provided "as is" without express or implied warranty.                  *
  14  **************************************************************************/
  15
  16 /* $Id:$ */
  17
  18 #include <TROOT.h>
  19 #include <TChain.h>
  20 #include <TFile.h>
  21 #include <TList.h>
  22 #include <TMath.h>
  23 #include <TTree.h>
  24 #include <TH2F.h>
  25 #include <TRandom.h>
  26
  27 #include "AliAnalysisTaskPhiCorrelations.h"
  28 #include "AliAnalyseLeadingTrackUE.h"
  29 #include "AliUEHistograms.h"
  30 #include "AliUEHist.h"
  31
  32 #include "AliAnalysisManager.h"
  33 #include "AliAODHandler.h"
  34 #include "AliAODInputHandler.h"
  35 #include "AliAODMCParticle.h"
  36 #include "AliInputEventHandler.h"
  37 #include "AliLog.h"
  38 #include "AliMCEventHandler.h"
  39 #include "AliVParticle.h"
  40 #include "AliCFContainer.h"
  41
  42 #include "AliESDEvent.h"
  43 #include "AliESDInputHandler.h"
  44 #include "AliMultiplicity.h"
  45 #include "AliCentrality.h"
  46 #include "AliStack.h"
  47 #include "AliAODMCHeader.h"
  48
  49 #include "AliEventPoolManager.h"
  50
  51
  52 ////////////////////////////////////////////////////////////////////////
  53 //
  54 // Analysis class for azimuthal correlation studies
  55 // Based on the UE task from Sara Vallero and Jan Fiete
  56 //
  57 // This class needs input AODs.
  58 // The output is a list of analysis-specific containers.
  59 //
  60 // The AOD can be either connected to the InputEventHandler
  61 // for a chain of AOD files
  62 // or
  63 // to the OutputEventHandler
  64 // for a chain of ESD files,
  65 // in this case the class should be in the train after the jet-finder
  66 //
  67 //    Authors:
  68 //    Jan Fiete Grosse-Oetringhaus
  69 //
  70 ////////////////////////////////////////////////////////////////////////
  71
  72
  73 ClassImp( AliAnalysisTaskPhiCorrelations )
  74 ClassImp( AliDPhiBasicParticle )
  75
  76 //____________________________________________________________________
  77 AliAnalysisTaskPhiCorrelations:: AliAnalysisTaskPhiCorrelations(const char* name):
  78 AliAnalysisTask(name,""),
  79 // general configuration
  80 fDebug(0),
  81 fMode(0),
  82 fReduceMemoryFootprint(kFALSE),
  83 fFillMixed(kTRUE),
  84 fMixingTracks(50000),
  85 fCompareCentralities(kFALSE),
  86 fTwoTrackEfficiencyStudy(kFALSE),
  87 fTwoTrackEfficiencyCut(0),
  88 fUseVtxAxis(kFALSE),
  89 fSkipTrigger(kFALSE),
  90 // pointers to UE classes
  91 fAnalyseUE(0x0),
  92 fHistos(0x0),
  93 fHistosMixed(0),
  94 fkTrackingEfficiency(0x0),
  95 // handlers and events
  96 fAOD(0x0),
  97 fESD(0x0),
  98 fArrayMC(0x0),
  99 fInputHandler(0x0),
 100 fMcEvent(0x0),
 101 fMcHandler(0x0),
 102 fPoolMgr(0x0),
 103 // histogram settings
 104 fListOfHistos(0x0),
 105 // event QA
 106 fnTracksVertex(1),  // QA tracks pointing to principal vertex (= 3 default)
 107 fZVertex(7.),
 108 fCentralityMethod("V0M"),
 109 // track cuts
 110 fTrackEtaCut(0.8),
 111 fOnlyOneEtaSide(0),
 112 fPtMin(0.5),
 113 fFilterBit(0xFF),
 114 fSelectBit(0),
 115 fUseChargeHadrons(kFALSE),
 116 fSelectCharge(0),
 117 fTriggerRestrictEta(-1),
 118 fEtaOrdering(kFALSE),
 119 fCutConversions(kFALSE),
 120 fCutResonances(kFALSE),
 121 fFillOnlyStep0(kFALSE),
 122 fSkipStep6(kFALSE),
 123 fFillpT(kFALSE)
 124 {
 125   // Default constructor
 126   // Define input and output slots here
 127   // Input slot #0 works with a TChain
 128   DefineInput(0, TChain::Class());
 129   // Output slot #0 writes into a TList container
 130   DefineOutput(0, TList::Class());
 131 }
 132
 133 AliAnalysisTaskPhiCorrelations::~AliAnalysisTaskPhiCorrelations()
 134 {
 135   // destructor
 136
 137   if (fListOfHistos  && !AliAnalysisManager::GetAnalysisManager()->IsProofMode())
 138     delete fListOfHistos;
 139 }
 140
 141 //____________________________________________________________________
 142 void AliAnalysisTaskPhiCorrelations::ConnectInputData(Option_t* /*option*/)
 143 {
 144
 145   // Connect the input data
 146   if (fDebug > 1) AliInfo("ConnectInputData() ");
 147
 148   // Since AODs can either be connected to the InputEventHandler
 149   // or to the OutputEventHandler ( the AOD is created by a previus task in the train )
 150   // we need to get the pointer to the AODEvent correctly.
 151
 152   // Delta AODs are also accepted.
 153
 154   TObject* handler = AliAnalysisManager::GetAnalysisManager()->GetInputEventHandler();
 155
 156   if( handler && handler->InheritsFrom("AliAODInputHandler") )
 157   { // input AOD
 158     fAOD = ((AliAODInputHandler*)handler)->GetEvent();
 159     if (fDebug > 1) AliInfo(" ==== Tracks and Jets from AliAODInputHandler");
 160   }
 161   else
 162   {  //output AOD
 163     handler = AliAnalysisManager::GetAnalysisManager()->GetOutputEventHandler();
 164     if (handler && handler->InheritsFrom("AliAODHandler") )
 165     {
 166       fAOD = ((AliAODHandler*)handler)->GetAOD();
 167       if (fDebug > 1) AliInfo(" ==== Tracks and Jets from AliAODHandler");
 168     }
 169     else
 170     {  // no AOD
 171       AliWarning("I can't get any AOD Event Handler");
 172     }
 173   }
 174
 175   if (handler && handler->InheritsFrom("AliESDInputHandler") )
 176   { // input ESD
 177     // pointer received per event in ::Exec
 178     if (fDebug > 1) AliInfo(" ==== Tracks and Jets from AliESDInputHandler");
 179   }
 180
 181   // Initialize common pointers
 182   Initialize();
 183 }
 184
 185 //____________________________________________________________________
 186 void  AliAnalysisTaskPhiCorrelations::CreateOutputObjects()
 187 {
 188   // Create the output container
 189
 190   if (fDebug > 1) AliInfo("CreateOutputObjects()");
 191
 192   // Initialize class with main algorithms, event and track selection.
 193   fAnalyseUE = new AliAnalyseLeadingTrackUE();
 194   fAnalyseUE->SetParticleSelectionCriteria(fFilterBit, fUseChargeHadrons, fTrackEtaCut, fPtMin);
 195   fAnalyseUE->SetDebug(fDebug);
 196   fAnalyseUE->DefineESDCuts(fFilterBit);
 197
 198   // Initialize output list of containers
 199   if (fListOfHistos != NULL){
 200         delete fListOfHistos;
 201         fListOfHistos = NULL;
 202         }
 203   if (!fListOfHistos){
 204         fListOfHistos = new TList();
 205         fListOfHistos->SetOwner(kTRUE);
 206         }
 207
 208   // Initialize class to handle histograms
 209   const char* histType = "4";
 210   if (fUseVtxAxis)
 211     histType = "5";
 212   fHistos = new AliUEHistograms("AliUEHistogramsSame", histType);
 213   fHistosMixed = new AliUEHistograms("AliUEHistogramsMixed", histType);
 214
 215   fHistos->SetSelectCharge(fSelectCharge);
 216   fHistosMixed->SetSelectCharge(fSelectCharge);
 217
 218   fHistos->SetTriggerRestrictEta(fTriggerRestrictEta);
 219   fHistosMixed->SetTriggerRestrictEta(fTriggerRestrictEta);
 220
 221   fHistos->SetOnlyOneEtaSide(fOnlyOneEtaSide);
 222   fHistosMixed->SetOnlyOneEtaSide(fOnlyOneEtaSide);
 223
 224   fHistos->SetEtaOrdering(fEtaOrdering);
 225   fHistosMixed->SetEtaOrdering(fEtaOrdering);
 226
 227   fHistos->SetPairCuts(fCutConversions, fCutResonances);
 228   fHistosMixed->SetPairCuts(fCutConversions, fCutResonances);
 229
 230   // add histograms to list
 231   fListOfHistos->Add(fHistos);
 232   fListOfHistos->Add(fHistosMixed);
 233
 234   fListOfHistos->Add(new TH2F("trackletsVsV0Cent", ";L1 clusters;v0 centrality", 100, -0.5, 9999.5, 101, 0, 101));
 235   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));
 236   fListOfHistos->Add(new TH1F("eventStat", ";;events", 4, -0.5, 3.5));
 237   fListOfHistos->Add(new TH2F("mixedDist", ";centrality;tracks;events", 101, 0, 101, 200, 0, fMixingTracks * 1.5));
 238   fListOfHistos->Add(new TH1F("pids", ";pdg;tracks", 2001, -1000.5, 1000.5));
 239
 240   PostData(0,fListOfHistos);
 241
 242   // Add task configuration to output list
 243   AddSettingsTree();
 244
 245   // event mixing
 246   Int_t trackDepth = fMixingTracks;
 247   Int_t poolsize   = 1000;  // Maximum number of events, ignored in the present implemented of AliEventPoolManager
 248
 249   Int_t nCentralityBins  = fHistos->GetUEHist(2)->GetEventHist()->GetNBins(1);
 250   Double_t* centralityBins = (Double_t*) fHistos->GetUEHist(2)->GetEventHist()->GetAxis(1, 0)->GetXbins()->GetArray();
 251
 252   Int_t nZvtxBins  = 7+1+7;
 253   // bins for second buffer are shifted by 100 cm
 254   Double_t vertexBins[] = { -7, -5, -3, -1, 1, 3, 5, 7, 93, 95, 97, 99, 101, 103, 105, 107 };
 255   Double_t* zvtxbin = vertexBins;
 256
 257   if (fHistos->GetUEHist(2)->GetEventHist()->GetNVar() > 2)
 258   {
 259     nZvtxBins = fHistos->GetUEHist(2)->GetEventHist()->GetNBins(2);
 260     zvtxbin = (Double_t*) fHistos->GetUEHist(2)->GetEventHist()->GetAxis(2, 0)->GetXbins()->GetArray();
 261   }
 262
 263   fPoolMgr = new AliEventPoolManager(poolsize, trackDepth, nCentralityBins, centralityBins, nZvtxBins, zvtxbin);
 264 }
 265
 266 //____________________________________________________________________
 267 void  AliAnalysisTaskPhiCorrelations::Exec(Option_t */*option*/)
 268 {
 269   // receive ESD pointer if we are not running AOD analysis
 270   if (!fAOD)
 271   {
 272     AliVEventHandler* handler = AliAnalysisManager::GetAnalysisManager()->GetInputEventHandler();
 273     if (handler && handler->InheritsFrom("AliESDInputHandler"))
 274       fESD = ((AliESDInputHandler*)handler)->GetEvent();
 275   }
 276
 277   if (fMode)
 278   {
 279     // correction mode
 280
 281     if (fMcHandler)
 282       fMcEvent = fMcHandler->MCEvent();
 283
 284     if (fAOD)
 285     {
 286       // array of MC particles
 287       fArrayMC = dynamic_cast<TClonesArray*>(fAOD->FindListObject(AliAODMCParticle::StdBranchName()));
 288       if (!fArrayMC)
 289         AliFatal("No array of MC particles found !!!");
 290     }
 291
 292     AnalyseCorrectionMode();
 293   }
 294   else AnalyseDataMode();
 295 }
 296
 297 /******************** ANALYSIS METHODS *****************************/
 298
 299 //____________________________________________________________________
 300 void  AliAnalysisTaskPhiCorrelations::AddSettingsTree()
 301 {
 302   //Write settings to output list
 303   TTree *settingsTree   = new TTree("UEAnalysisSettings","Analysis Settings in UE estimation");
 304   settingsTree->Branch("fnTracksVertex", &fnTracksVertex,"nTracksVertex/I");
 305   settingsTree->Branch("fZVertex", &fZVertex,"ZVertex/D");
 306   //settingsTree->Branch("fCentralityMethod", fCentralityMethod.Data(),"CentralityMethod/C");
 307   settingsTree->Branch("fTrackEtaCut", &fTrackEtaCut, "TrackEtaCut/D");
 308   settingsTree->Branch("fOnlyOneEtaSide", &fOnlyOneEtaSide,"OnlyOneEtaSide/I");
 309   settingsTree->Branch("fPtMin", &fPtMin, "PtMin/D");
 310   settingsTree->Branch("fFilterBit", &fFilterBit,"FilterBit/I");
 311   settingsTree->Branch("fSelectBit", &fSelectBit,"EventSelectionBit/I");
 312   settingsTree->Branch("fUseChargeHadrons", &fUseChargeHadrons,"UseChHadrons/O");
 313   settingsTree->Branch("fSelectCharge", &fSelectCharge,"SelectCharge/I");
 314   settingsTree->Branch("fTriggerRestrictEta", &fTriggerRestrictEta,"TriggerRestrictEta/D");
 315   settingsTree->Branch("fEtaOrdering", &fEtaOrdering,"EtaOrdering/O");
 316   settingsTree->Branch("fCutConversions", &fCutConversions,"CutConversions/O");
 317   settingsTree->Branch("fCutResonances", &fCutResonances,"CutResonances/O");
 318   settingsTree->Branch("fFillpT", &fFillpT,"FillpT/O");
 319   settingsTree->Branch("fkTrackingEfficiency", "TH1D", &fkTrackingEfficiency);
 320   settingsTree->Branch("fMixingTracks", &fMixingTracks,"MixingTracks/I");
 321   settingsTree->Branch("fSkipTrigger", &fSkipTrigger,"SkipTrigger/O");
 322
 323   settingsTree->Fill();
 324   fListOfHistos->Add(settingsTree);
 325 }
 326
 327 //____________________________________________________________________
 328 void  AliAnalysisTaskPhiCorrelations::AnalyseCorrectionMode()
 329 {
 330   // Run the analysis on MC to get the correction maps
 331   //
 332
 333   if ( fDebug > 3 ) AliInfo( " Processing event in Corrections mode ..." );
 334
 335   Double_t centrality = 0;
 336
 337   if (fCentralityMethod.Length() > 0)
 338   {
 339     AliCentrality *centralityObj = 0;
 340     if (fAOD)
 341       centralityObj = fAOD->GetHeader()->GetCentralityP();
 342     else if (fESD)
 343       centralityObj = fESD->GetCentrality();
 344
 345     if (centralityObj)
 346     {
 347       centrality = centralityObj->GetCentralityPercentileUnchecked(fCentralityMethod);
 348       AliInfo(Form("Centrality is %f", centrality));
 349     }
 350     else
 351     {
 352       Printf("WARNING: Centrality object is 0");
 353       centrality = -1;
 354      }
 355   }
 356
 357   // Support for ESD and AOD based analysis
 358   AliVEvent* inputEvent = fAOD;
 359   if (!inputEvent)
 360     inputEvent = fESD;
 361
 362   if (inputEvent)
 363     fHistos->SetRunNumber(inputEvent->GetRunNumber());
 364
 365   TObject* mc = fArrayMC;
 366   if (!mc)
 367     mc = fMcEvent;
 368
 369   // count all events
 370   fHistos->FillEvent(centrality, -1);
 371
 372   // Only consider MC events within the vtx-z region used also as cut on the reconstructed vertex
 373   TObject* vertexSupplier = fMcEvent;
 374   if (fAOD) // AOD
 375     vertexSupplier = fAOD->FindListObject(AliAODMCHeader::StdBranchName());
 376
 377   if (!fAnalyseUE->VertexSelection(vertexSupplier, 0, fZVertex))
 378     return;
 379
 380   Float_t zVtx = 0;
 381   if (fAOD)
 382     zVtx = ((AliAODMCHeader*) vertexSupplier)->GetVtxZ();
 383   else
 384     zVtx = fMcEvent->GetPrimaryVertex()->GetZ();
 385   Float_t weight = 1;
 386   if (fFillpT)
 387     weight = -1;
 388
 389   // Get MC primaries
 390   TObjArray* tracksMC = fAnalyseUE->GetAcceptedParticles(mc, 0, kTRUE, -1, kTRUE);
 391
 392   if (fAOD)
 393   {
 394     for (Int_t i=0; i<fArrayMC->GetEntriesFast(); i++)
 395       ((TH1F*) fListOfHistos->FindObject("pids"))->Fill(((AliAODMCParticle*) fArrayMC->At(i))->PdgCode());
 396   }
 397   else
 398   {
 399     for (Int_t i=0; i<fMcEvent->GetNumberOfTracks(); i++)
 400       ((TH1F*) fListOfHistos->FindObject("pids"))->Fill(fMcEvent->GetTrack(i)->PdgCode());
 401   }
 402
 403   // (MC-true all particles)
 404   // STEP 0
 405   fHistos->FillCorrelations(centrality, zVtx, AliUEHist::kCFStepAll, tracksMC, 0, weight);
 406
 407   // mixed event
 408   if (fFillMixed)
 409   {
 410     AliEventPool* pool = fPoolMgr->GetEventPool(centrality, zVtx);
 411     //pool->PrintInfo();
 412     if (pool->IsReady() || pool->NTracksInPool() > fMixingTracks / 10 || pool->GetCurrentNEvents() >= 5)
 413       for (Int_t jMix=0; jMix<pool->GetCurrentNEvents(); jMix++)
 414         fHistosMixed->FillCorrelations(centrality, zVtx, AliUEHist::kCFStepAll, tracksMC, pool->GetEvent(jMix), 1.0 / pool->GetCurrentNEvents(), (jMix == 0));
 415     pool->UpdatePool(CloneAndReduceTrackList(tracksMC));
 416   }
 417
 418 //   Printf("trigger: %d", ((AliInputEventHandler*)fInputHandler)->IsEventSelected());
 419
 420   // Trigger selection ************************************************
 421   if (!fFillOnlyStep0 && (fSkipTrigger || fAnalyseUE->TriggerSelection(fInputHandler)))
 422   {
 423     // (MC-true all particles)
 424     // STEP 1
 425     if (!fReduceMemoryFootprint)
 426       fHistos->FillCorrelations(centrality, zVtx, AliUEHist::kCFStepTriggered, tracksMC, 0, weight);
 427     else
 428       fHistos->FillEvent(centrality, AliUEHist::kCFStepTriggered);
 429
 430     if (!inputEvent) {
 431       AliFatal("UNEXPECTED: inputEvent is 0. Trigger selection should have failed");
 432       return;
 433     }
 434
 435     // Vertex selection *************************************************
 436     if (fAnalyseUE->VertexSelection(inputEvent, fnTracksVertex, fZVertex))
 437     {
 438       // fill here for tracking efficiency
 439       // loop over particle species
 440
 441       for (Int_t particleSpecies = 0; particleSpecies < 4; particleSpecies++)
 442       {
 443         TObjArray* primMCParticles = fAnalyseUE->GetAcceptedParticles(mc, 0x0, kTRUE, particleSpecies, kTRUE);
 444         TObjArray* primRecoTracksMatched = fAnalyseUE->GetAcceptedParticles(inputEvent, mc, kTRUE, particleSpecies, kTRUE);
 445         TObjArray* allRecoTracksMatched = fAnalyseUE->GetAcceptedParticles(inputEvent, mc, kFALSE, particleSpecies, kTRUE);
 446
 447         fHistos->FillTrackingEfficiency(primMCParticles, primRecoTracksMatched, allRecoTracksMatched, particleSpecies, centrality);
 448
 449 //      Printf("%d --> %d %d %d", particleSpecies, primMCParticles->GetEntries(), primRecoTracksMatched->GetEntries(), allRecoTracksMatched->GetEntries());
 450
 451         delete primMCParticles;
 452         delete primRecoTracksMatched;
 453         delete allRecoTracksMatched;
 454       }
 455
 456       // (MC-true all particles)
 457       // STEP 2
 458       if (!fReduceMemoryFootprint)
 459         fHistos->FillCorrelations(centrality, zVtx, AliUEHist::kCFStepVertex, tracksMC, 0, weight);
 460       else
 461         fHistos->FillEvent(centrality, AliUEHist::kCFStepVertex);
 462
 463       // Get MC primaries that match reconstructed track
 464       TObjArray* tracksRecoMatchedPrim = fAnalyseUE->GetAcceptedParticles(inputEvent, mc, kTRUE, -1, kTRUE);
 465
 466       // (RECO-matched (quantities from MC particle) primary particles)
 467       // STEP 4
 468       fHistos->FillCorrelations(centrality, zVtx, AliUEHist::kCFStepTrackedOnlyPrim, tracksRecoMatchedPrim, 0, weight);
 469
 470       // Get MC primaries + secondaries that match reconstructed track
 471       TObjArray* tracksRecoMatchedAll = fAnalyseUE->GetAcceptedParticles(inputEvent, mc, kFALSE, -1, kTRUE);
 472
 473       // (RECO-matched (quantities from MC particle) all particles)
 474       // STEP 5
 475       fHistos->FillCorrelations(centrality, zVtx, AliUEHist::kCFStepTracked, tracksRecoMatchedAll, 0, weight);
 476
 477       // Get RECO tracks
 478       TObjArray* tracks = fAnalyseUE->GetAcceptedParticles(inputEvent, 0, kTRUE, -1, kTRUE);
 479
 480       // (RECO all tracks)
 481       // STEP 6
 482       if (!fSkipStep6)
 483         fHistos->FillCorrelations(centrality, zVtx, AliUEHist::kCFStepReconstructed, tracks, 0, weight);
 484
 485       // mixed event
 486       if (fFillMixed && !fSkipStep6)
 487       {
 488         AliEventPool* pool2 = fPoolMgr->GetEventPool(centrality, zVtx + 100);
 489         //pool2->PrintInfo();
 490         if (pool2->IsReady() || pool2->NTracksInPool() > fMixingTracks / 10 || pool2->GetCurrentNEvents() >= 5)
 491           for (Int_t jMix=0; jMix<pool2->GetCurrentNEvents(); jMix++)
 492             fHistosMixed->FillCorrelations(centrality, zVtx, AliUEHist::kCFStepReconstructed, tracks, pool2->GetEvent(jMix), 1.0 / pool2->GetCurrentNEvents(), (jMix == 0));
 493         pool2->UpdatePool(CloneAndReduceTrackList(tracks));
 494       }
 495
 496       if (0 && !fReduceMemoryFootprint)
 497       {
 498         // make list of secondaries (matched with MC)
 499         TObjArray* tracksRecoMatchedSecondaries = new TObjArray;
 500         for (Int_t i=0; i<tracksRecoMatchedAll->GetEntriesFast(); i++)
 501           if (((AliAODMCParticle*)tracksRecoMatchedAll->At(i))->IsPhysicalPrimary() == kFALSE)
 502             tracksRecoMatchedSecondaries->Add(tracksRecoMatchedAll->At(i));
 503
 504         // Study: Use only secondaries as trigger particles and plot the correlation vs. all particles; store in step 9
 505         fHistos->FillCorrelations(centrality, zVtx, AliUEHist::kCFStepBiasStudy2, tracksRecoMatchedSecondaries, tracksRecoMatchedAll, weight);
 506
 507         // Study: Use only primaries as trigger particles and plot the correlation vs. secondaries; store in step 8
 508         fHistos->FillCorrelations(centrality, zVtx, AliUEHist::kCFStepBiasStudy, tracksRecoMatchedPrim, tracksRecoMatchedSecondaries, weight);
 509
 510         // plot delta phi vs process id of secondaries
 511         // trigger particles: primaries in 4 < pT < 10
 512         // associated particles: secondaries in 1 < pT < 10
 513
 514         for (Int_t i=0; i<tracksRecoMatchedPrim->GetEntriesFast(); i++)
 515         {
 516           AliVParticle* triggerParticle = (AliVParticle*) tracksRecoMatchedPrim->At(i);
 517
 518           if (triggerParticle->Pt() < 4 || triggerParticle->Pt() > 10)
 519             continue;
 520
 521           for (Int_t j=0; j<tracksRecoMatchedSecondaries->GetEntriesFast(); j++)
 522           {
 523             AliAODMCParticle* particle = (AliAODMCParticle*) tracksRecoMatchedSecondaries->At(j);
 524
 525             if (particle->Pt() < 1 || particle->Pt() > 10)
 526               continue;
 527
 528             if (particle->Pt() > triggerParticle->Pt())
 529               continue;
 530
 531             Double_t deltaPhi = triggerParticle->Phi() - particle->Phi();
 532             if (deltaPhi > 1.5 * TMath::Pi())
 533               deltaPhi -= TMath::TwoPi();
 534             if (deltaPhi < -0.5 * TMath::Pi())
 535               deltaPhi += TMath::TwoPi();
 536
 537             Int_t processID = fMcEvent->Stack()->Particle(particle->GetLabel())->GetUniqueID();
 538
 539             ((TH2F*) fListOfHistos->FindObject("processIDs"))->Fill(deltaPhi, processID);
 540           }
 541         }
 542
 543         delete tracksRecoMatchedSecondaries;
 544       }
 545
 546       delete tracksRecoMatchedPrim;
 547       delete tracksRecoMatchedAll;
 548       delete tracks;
 549     }
 550   }
 551
 552   delete tracksMC;
 553 }
 554
 555 //____________________________________________________________________
 556 void  AliAnalysisTaskPhiCorrelations::AnalyseDataMode()
 557 {
 558
 559   // Run the analysis on DATA or MC to get raw distributions
 560
 561   if ( fDebug > 3 ) AliInfo( " Processing event in Data mode ..." );
 562
 563   ((TH1F*) fListOfHistos->FindObject("eventStat"))->Fill(0);
 564
 565   // skip not selected events here (the AOD is not updated for those)
 566   if (!fInputHandler)
 567     return;
 568
 569   if (!(fInputHandler->IsEventSelected() & (AliVEvent::kMB | AliVEvent::kUserDefined)))
 570     return;
 571
 572   Double_t centrality = 0;
 573
 574   AliCentrality *centralityObj = 0;
 575   if (fCentralityMethod.Length() > 0)
 576   {
 577     if (fAOD)
 578       centralityObj = fAOD->GetHeader()->GetCentralityP();
 579     else if (fESD)
 580       centralityObj = fESD->GetCentrality();
 581
 582     if (centralityObj)
 583       centrality = centralityObj->GetCentralityPercentile(fCentralityMethod);
 584       //centrality = centralityObj->GetCentralityPercentileUnchecked(fCentralityMethod);
 585     else
 586       centrality = -1;
 587
 588     if (fAOD)
 589     {
 590       // remove outliers
 591       if (centrality == 0)
 592       {
 593         if (fAOD->GetVZEROData())
 594         {
 595           Float_t multV0 = 0;
 596           for (Int_t i=0; i<64; i++)
 597             multV0 += fAOD->GetVZEROData()->GetMultiplicity(i);
 598           if (multV0 < 19500)
 599           {
 600             centrality = -1;
 601             AliInfo("Rejecting event due to too small V0 multiplicity");
 602           }
 603         }
 604       }
 605     }
 606
 607     AliInfo(Form("Centrality is %f", centrality));
 608   }
 609
 610   // Support for ESD and AOD based analysis
 611   AliVEvent* inputEvent = fAOD;
 612   if (!inputEvent)
 613     inputEvent = fESD;
 614
 615   Float_t bSign = (inputEvent->GetMagneticField() > 0) ? 1 : -1;
 616
 617   fHistos->SetRunNumber(inputEvent->GetRunNumber());
 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::kCFStepAll);
 621
 622   // Trigger selection ************************************************
 623   if (!fAnalyseUE->TriggerSelection(fInputHandler)) 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::kCFStepTriggered);
 627
 628   // Vertex selection *************************************************
 629   if(!fAnalyseUE->VertexSelection(inputEvent, fnTracksVertex, fZVertex)) return;
 630
 631   // Fill the "event-counting-container", it is needed to get the number of events remaining after each event-selection cut
 632   fHistos->FillEvent(centrality, AliUEHist::kCFStepVertex);
 633
 634   // optimization
 635   if (centrality < 0 && !fCompareCentralities)
 636     return;
 637
 638   TObjArray* tracks = fAnalyseUE->GetAcceptedParticles(inputEvent, 0, kTRUE, -1, kTRUE);
 639   // create a list of reduced objects. This speeds up processing and reduces memory consumption for the event pool
 640   TObjArray* tracksClone = CloneAndReduceTrackList(tracks);
 641   delete tracks;
 642
 643   //Printf("Accepted %d tracks", tracks->GetEntries());
 644
 645   const AliVVertex* vertex = inputEvent->GetPrimaryVertex();
 646   Double_t zVtx = vertex->GetZ();
 647
 648   Float_t weight = 1;
 649   if (fFillpT)
 650     weight = -1;
 651
 652   // fill two different centralities (syst study)
 653   // the zvtx axis is used to distinguish the results of both centralities: configured centrality in zvtx = 0, SPD in zvtx = 2
 654   if (fCompareCentralities)
 655     zVtx = 0;
 656
 657   // Fill containers at STEP 6 (reconstructed)
 658   if (centrality >= 0)
 659   {
 660     if (!fSkipStep6)
 661       fHistos->FillCorrelations(centrality, zVtx, AliUEHist::kCFStepReconstructed, tracksClone, 0, weight);
 662
 663     ((TH1F*) fListOfHistos->FindObject("eventStat"))->Fill(1);
 664
 665     if (fTwoTrackEfficiencyCut > 0)
 666       fHistos->FillCorrelations(centrality, zVtx, AliUEHist::kCFStepBiasStudy, tracksClone, 0, weight, kTRUE, kTRUE, bSign, fTwoTrackEfficiencyCut);
 667   }
 668
 669   // fill second time with SPD centrality
 670   if (fCompareCentralities && centralityObj)
 671   {
 672     centrality = centralityObj->GetCentralityPercentile("CL1");
 673     if (centrality >= 0 && !fSkipStep6)
 674       fHistos->FillCorrelations(centrality, 2, AliUEHist::kCFStepReconstructed, tracksClone, 0, weight);
 675   }
 676
 677   if (fFillMixed)
 678   {
 679     // event mixing
 680
 681     // 1. First get an event pool corresponding in mult (cent) and
 682     //    zvertex to the current event. Once initialized, the pool
 683     //    should contain nMix (reduced) events. This routine does not
 684     //    pre-scan the chain. The first several events of every chain
 685     //    will be skipped until the needed pools are filled to the
 686     //    specified depth. If the pool categories are not too rare, this
 687     //    should not be a problem. If they are rare, you could lose
 688     //    statistics.
 689
 690     // 2. Collect the whole pool's content of tracks into one TObjArray
 691     //    (bgTracks), which is effectively a single background super-event.
 692
 693     // 3. The reduced and bgTracks arrays must both be passed into
 694     //    FillCorrelations(). Also nMix should be passed in, so a weight
 695     //    of 1./nMix can be applied.
 696
 697     AliEventPool* pool = fPoolMgr->GetEventPool(centrality, zVtx);
 698
 699     if (!pool)
 700       AliFatal(Form("No pool found for centrality = %f, zVtx = %f", centrality, zVtx));
 701
 702     //pool->SetDebug(1);
 703
 704     if (pool->IsReady() || pool->NTracksInPool() > fMixingTracks / 10 || pool->GetCurrentNEvents() >= 5)
 705     {
 706
 707       Int_t nMix = pool->GetCurrentNEvents();
 708 //       cout << "nMix = " << nMix << " tracks in pool = " << pool->NTracksInPool() << endl;
 709
 710       ((TH1F*) fListOfHistos->FindObject("eventStat"))->Fill(2);
 711       ((TH2F*) fListOfHistos->FindObject("mixedDist"))->Fill(centrality, pool->NTracksInPool());
 712       if (pool->IsReady())
 713         ((TH1F*) fListOfHistos->FindObject("eventStat"))->Fill(3);
 714
 715       // Fill mixed-event histos here
 716       for (Int_t jMix=0; jMix<nMix; jMix++)
 717       {
 718         TObjArray* bgTracks = pool->GetEvent(jMix);
 719
 720         if (!fSkipStep6)
 721           fHistosMixed->FillCorrelations(centrality, zVtx, AliUEHist::kCFStepReconstructed, tracksClone, bgTracks, 1.0 / nMix, (jMix == 0));
 722
 723         if (fTwoTrackEfficiencyCut > 0)
 724           fHistosMixed->FillCorrelations(centrality, zVtx, AliUEHist::kCFStepBiasStudy, tracksClone, bgTracks, 1.0 / nMix, (jMix == 0), kTRUE, bSign, fTwoTrackEfficiencyCut);
 725       }
 726     }
 727
 728     // ownership is with the pool now
 729     pool->UpdatePool(tracksClone);
 730     //pool->PrintInfo();
 731   }
 732   else
 733     delete tracksClone;
 734 }
 735
 736 TObjArray* AliAnalysisTaskPhiCorrelations::CloneAndReduceTrackList(TObjArray* tracks)
 737 {
 738   // clones a track list by using AliDPhiBasicParticle which uses much less memory (used for event mixing)
 739
 740   TObjArray* tracksClone = new TObjArray;
 741   tracksClone->SetOwner(kTRUE);
 742
 743   for (Int_t i=0; i<tracks->GetEntriesFast(); i++)
 744   {
 745     AliVParticle* particle = (AliVParticle*) tracks->At(i);
 746     tracksClone->Add(new AliDPhiBasicParticle(particle->Eta(), particle->Phi(), particle->Pt(), particle->Charge()));
 747   }
 748
 749   return tracksClone;
 750 }
 751
 752 //____________________________________________________________________
 753 void  AliAnalysisTaskPhiCorrelations::Initialize()
 754 {
 755   // input handler
 756   fInputHandler = (AliInputEventHandler*)
 757          ((AliAnalysisManager::GetAnalysisManager())->GetInputEventHandler());
 758   // MC handler
 759   fMcHandler = dynamic_cast<AliMCEventHandler*> (AliAnalysisManager::GetAnalysisManager()->GetMCtruthEventHandler());
 760 }