PWGCF/Correlations/DPhi/AliAnalysisTaskPhiCorrelations.cxx

   1 /**************************************************************************
   2  * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
   3  *                                                                        *
   4  * Author: The ALICE Off-line Project.                                    *
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  10  * copies and that both the copyright notice and this permission notice   *
  11  * appear in the supporting documentation. The authors make no claims     *
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  13  * provided "as is" without express or implied warranty.                  *
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  15
  16 /* $Id:$ */
  17
  18 #include <TROOT.h>
  19 #include <TChain.h>
  20 #include <TFile.h>
  21 #include <TList.h>
  22 #include <TMath.h>
  23 #include <TTree.h>
  24 #include <TH2F.h>
  25 #include <TRandom.h>
  26
  27 #include "AliAnalysisTaskPhiCorrelations.h"
  28 #include "AliAnalyseLeadingTrackUE.h"
  29 #include "AliUEHistograms.h"
  30 #include "AliUEHist.h"
  31
  32 #include "AliAnalysisManager.h"
  33 #include "AliAODHandler.h"
  34 #include "AliAODInputHandler.h"
  35 #include "AliAODMCParticle.h"
  36 #include "AliInputEventHandler.h"
  37 #include "AliLog.h"
  38 #include "AliMCEventHandler.h"
  39 #include "AliVParticle.h"
  40 #include "AliCFContainer.h"
  41
  42 #include "AliESDEvent.h"
  43 #include "AliESDInputHandler.h"
  44 #include "AliMultiplicity.h"
  45 #include "AliCentrality.h"
  46 #include "AliStack.h"
  47 #include "AliAODMCHeader.h"
  48
  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 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 AliEventPool
 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   fHistos->SetRunNumber(inputEvent->GetRunNumber());
 363
 364   TObject* mc = fArrayMC;
 365   if (!mc)
 366     mc = fMcEvent;
 367
 368   // count all events
 369   fHistos->FillEvent(centrality, -1);
 370
 371   // Only consider MC events within the vtx-z region used also as cut on the reconstructed vertex
 372   TObject* vertexSupplier = fMcEvent;
 373   if (fAOD) // AOD
 374     vertexSupplier = fAOD->FindListObject(AliAODMCHeader::StdBranchName());
 375
 376   if (!fAnalyseUE->VertexSelection(vertexSupplier, 0, fZVertex))
 377     return;
 378
 379   Float_t zVtx = 0;
 380   if (fAOD)
 381     zVtx = ((AliAODMCHeader*) vertexSupplier)->GetVtxZ();
 382   else
 383     zVtx = fMcEvent->GetPrimaryVertex()->GetZ();
 384   Float_t weight = 1;
 385   if (fFillpT)
 386     weight = -1;
 387
 388   // Get MC primaries
 389   TObjArray* tracksMC = fAnalyseUE->GetAcceptedParticles(mc, 0, kTRUE, -1, kTRUE);
 390
 391   if (fAOD)
 392   {
 393     for (Int_t i=0; i<fArrayMC->GetEntriesFast(); i++)
 394       ((TH1F*) fListOfHistos->FindObject("pids"))->Fill(((AliAODMCParticle*) fArrayMC->At(i))->PdgCode());
 395   }
 396   else
 397   {
 398     for (Int_t i=0; i<fMcEvent->GetNumberOfTracks(); i++)
 399       ((TH1F*) fListOfHistos->FindObject("pids"))->Fill(fMcEvent->GetTrack(i)->PdgCode());
 400   }
 401
 402   // (MC-true all particles)
 403   // STEP 0
 404   fHistos->FillCorrelations(centrality, zVtx, AliUEHist::kCFStepAll, tracksMC, 0, weight);
 405
 406   // mixed event
 407   if (fFillMixed)
 408   {
 409     AliEventPool* pool = fPoolMgr->GetEventPool(centrality, zVtx);
 410     //pool->PrintInfo();
 411     if (pool->IsReady() || pool->NTracksInPool() > fMixingTracks / 10 || pool->GetCurrentNEvents() >= 5)
 412       for (Int_t jMix=0; jMix<pool->GetCurrentNEvents(); jMix++)
 413         fHistosMixed->FillCorrelations(centrality, zVtx, AliUEHist::kCFStepAll, tracksMC, pool->GetEvent(jMix), 1.0 / pool->GetCurrentNEvents(), (jMix == 0));
 414     pool->UpdatePool(CloneAndReduceTrackList(tracksMC));
 415   }
 416
 417 //   Printf("trigger: %d", ((AliInputEventHandler*)fInputHandler)->IsEventSelected());
 418
 419   // Trigger selection ************************************************
 420   if (!fFillOnlyStep0 && (fSkipTrigger || fAnalyseUE->TriggerSelection(fInputHandler)))
 421   {
 422     // (MC-true all particles)
 423     // STEP 1
 424     if (!fReduceMemoryFootprint)
 425       fHistos->FillCorrelations(centrality, zVtx, AliUEHist::kCFStepTriggered, tracksMC, 0, weight);
 426     else
 427       fHistos->FillEvent(centrality, AliUEHist::kCFStepTriggered);
 428
 429     if (!inputEvent) {
 430       AliFatal("UNEXPECTED: inputEvent is 0. Trigger selection should have failed");
 431       return;
 432     }
 433
 434     // Vertex selection *************************************************
 435     if (fAnalyseUE->VertexSelection(inputEvent, fnTracksVertex, fZVertex))
 436     {
 437       // fill here for tracking efficiency
 438       // loop over particle species
 439
 440       for (Int_t particleSpecies = 0; particleSpecies < 4; particleSpecies++)
 441       {
 442         TObjArray* primMCParticles = fAnalyseUE->GetAcceptedParticles(mc, 0x0, kTRUE, particleSpecies, kTRUE);
 443         TObjArray* primRecoTracksMatched = fAnalyseUE->GetAcceptedParticles(inputEvent, mc, kTRUE, particleSpecies, kTRUE);
 444         TObjArray* allRecoTracksMatched = fAnalyseUE->GetAcceptedParticles(inputEvent, mc, kFALSE, particleSpecies, kTRUE);
 445
 446         fHistos->FillTrackingEfficiency(primMCParticles, primRecoTracksMatched, allRecoTracksMatched, particleSpecies, centrality);
 447
 448 //      Printf("%d --> %d %d %d", particleSpecies, primMCParticles->GetEntries(), primRecoTracksMatched->GetEntries(), allRecoTracksMatched->GetEntries());
 449
 450         delete primMCParticles;
 451         delete primRecoTracksMatched;
 452         delete allRecoTracksMatched;
 453       }
 454
 455       // (MC-true all particles)
 456       // STEP 2
 457       if (!fReduceMemoryFootprint)
 458         fHistos->FillCorrelations(centrality, zVtx, AliUEHist::kCFStepVertex, tracksMC, 0, weight);
 459       else
 460         fHistos->FillEvent(centrality, AliUEHist::kCFStepVertex);
 461
 462       // Get MC primaries that match reconstructed track
 463       TObjArray* tracksRecoMatchedPrim = fAnalyseUE->GetAcceptedParticles(inputEvent, mc, kTRUE, -1, kTRUE);
 464
 465       // (RECO-matched (quantities from MC particle) primary particles)
 466       // STEP 4
 467       fHistos->FillCorrelations(centrality, zVtx, AliUEHist::kCFStepTrackedOnlyPrim, tracksRecoMatchedPrim, 0, weight);
 468
 469       // Get MC primaries + secondaries that match reconstructed track
 470       TObjArray* tracksRecoMatchedAll = fAnalyseUE->GetAcceptedParticles(inputEvent, mc, kFALSE, -1, kTRUE);
 471
 472       // (RECO-matched (quantities from MC particle) all particles)
 473       // STEP 5
 474       fHistos->FillCorrelations(centrality, zVtx, AliUEHist::kCFStepTracked, tracksRecoMatchedAll, 0, weight);
 475
 476       // Get RECO tracks
 477       TObjArray* tracks = fAnalyseUE->GetAcceptedParticles(inputEvent, 0, kTRUE, -1, kTRUE);
 478
 479       // (RECO all tracks)
 480       // STEP 6
 481       if (!fSkipStep6)
 482         fHistos->FillCorrelations(centrality, zVtx, AliUEHist::kCFStepReconstructed, tracks, 0, weight);
 483
 484       // mixed event
 485       if (fFillMixed && !fSkipStep6)
 486       {
 487         AliEventPool* pool2 = fPoolMgr->GetEventPool(centrality, zVtx + 100);
 488         //pool2->PrintInfo();
 489         if (pool2->IsReady() || pool2->NTracksInPool() > fMixingTracks / 10 || pool2->GetCurrentNEvents() >= 5)
 490           for (Int_t jMix=0; jMix<pool2->GetCurrentNEvents(); jMix++)
 491             fHistosMixed->FillCorrelations(centrality, zVtx, AliUEHist::kCFStepReconstructed, tracks, pool2->GetEvent(jMix), 1.0 / pool2->GetCurrentNEvents(), (jMix == 0));
 492         pool2->UpdatePool(CloneAndReduceTrackList(tracks));
 493       }
 494
 495       if (0 && !fReduceMemoryFootprint)
 496       {
 497         // make list of secondaries (matched with MC)
 498         TObjArray* tracksRecoMatchedSecondaries = new TObjArray;
 499         for (Int_t i=0; i<tracksRecoMatchedAll->GetEntriesFast(); i++)
 500           if (((AliAODMCParticle*)tracksRecoMatchedAll->At(i))->IsPhysicalPrimary() == kFALSE)
 501             tracksRecoMatchedSecondaries->Add(tracksRecoMatchedAll->At(i));
 502
 503         // Study: Use only secondaries as trigger particles and plot the correlation vs. all particles; store in step 9
 504         fHistos->FillCorrelations(centrality, zVtx, AliUEHist::kCFStepBiasStudy2, tracksRecoMatchedSecondaries, tracksRecoMatchedAll, weight);
 505
 506         // Study: Use only primaries as trigger particles and plot the correlation vs. secondaries; store in step 8
 507         fHistos->FillCorrelations(centrality, zVtx, AliUEHist::kCFStepBiasStudy, tracksRecoMatchedPrim, tracksRecoMatchedSecondaries, weight);
 508
 509         // plot delta phi vs process id of secondaries
 510         // trigger particles: primaries in 4 < pT < 10
 511         // associated particles: secondaries in 1 < pT < 10
 512
 513         for (Int_t i=0; i<tracksRecoMatchedPrim->GetEntriesFast(); i++)
 514         {
 515           AliVParticle* triggerParticle = (AliVParticle*) tracksRecoMatchedPrim->At(i);
 516
 517           if (triggerParticle->Pt() < 4 || triggerParticle->Pt() > 10)
 518             continue;
 519
 520           for (Int_t j=0; j<tracksRecoMatchedSecondaries->GetEntriesFast(); j++)
 521           {
 522             AliAODMCParticle* particle = (AliAODMCParticle*) tracksRecoMatchedSecondaries->At(j);
 523
 524             if (particle->Pt() < 1 || particle->Pt() > 10)
 525               continue;
 526
 527             if (particle->Pt() > triggerParticle->Pt())
 528               continue;
 529
 530             Double_t deltaPhi = triggerParticle->Phi() - particle->Phi();
 531             if (deltaPhi > 1.5 * TMath::Pi())
 532               deltaPhi -= TMath::TwoPi();
 533             if (deltaPhi < -0.5 * TMath::Pi())
 534               deltaPhi += TMath::TwoPi();
 535
 536             Int_t processID = fMcEvent->Stack()->Particle(particle->GetLabel())->GetUniqueID();
 537
 538             ((TH2F*) fListOfHistos->FindObject("processIDs"))->Fill(deltaPhi, processID);
 539           }
 540         }
 541
 542         delete tracksRecoMatchedSecondaries;
 543       }
 544
 545       delete tracksRecoMatchedPrim;
 546       delete tracksRecoMatchedAll;
 547       delete tracks;
 548     }
 549   }
 550
 551   delete tracksMC;
 552 }
 553
 554 //____________________________________________________________________
 555 void  AliAnalysisTaskPhiCorrelations::AnalyseDataMode()
 556 {
 557
 558   // Run the analysis on DATA or MC to get raw distributions
 559
 560   if ( fDebug > 3 ) AliInfo( " Processing event in Data mode ..." );
 561
 562   ((TH1F*) fListOfHistos->FindObject("eventStat"))->Fill(0);
 563
 564   // skip not selected events here (the AOD is not updated for those)
 565   if (!fInputHandler)
 566     return;
 567
 568   if (!(fInputHandler->IsEventSelected() & (AliVEvent::kMB | AliVEvent::kUserDefined)))
 569     return;
 570
 571   Double_t centrality = 0;
 572
 573   AliCentrality *centralityObj = 0;
 574   if (fCentralityMethod.Length() > 0)
 575   {
 576     if (fAOD)
 577       centralityObj = fAOD->GetHeader()->GetCentralityP();
 578     else if (fESD)
 579       centralityObj = fESD->GetCentrality();
 580
 581     if (centralityObj)
 582       centrality = centralityObj->GetCentralityPercentile(fCentralityMethod);
 583       //centrality = centralityObj->GetCentralityPercentileUnchecked(fCentralityMethod);
 584     else
 585       centrality = -1;
 586
 587     if (fAOD)
 588     {
 589       // remove outliers
 590       if (centrality == 0)
 591       {
 592         if (fAOD->GetVZEROData())
 593         {
 594           Float_t multV0 = 0;
 595           for (Int_t i=0; i<64; i++)
 596             multV0 += fAOD->GetVZEROData()->GetMultiplicity(i);
 597           if (multV0 < 19500)
 598           {
 599             centrality = -1;
 600             AliInfo("Rejecting event due to too small V0 multiplicity");
 601           }
 602         }
 603       }
 604     }
 605
 606     AliInfo(Form("Centrality is %f", centrality));
 607   }
 608
 609   // Support for ESD and AOD based analysis
 610   AliVEvent* inputEvent = fAOD;
 611   if (!inputEvent)
 612     inputEvent = fESD;
 613
 614   Float_t bSign = (inputEvent->GetMagneticField() > 0) ? 1 : -1;
 615
 616   fHistos->SetRunNumber(inputEvent->GetRunNumber());
 617
 618   // Fill the "event-counting-container", it is needed to get the number of events remaining after each event-selection cut
 619   fHistos->FillEvent(centrality, AliUEHist::kCFStepAll);
 620
 621   // Trigger selection ************************************************
 622   if (!fAnalyseUE->TriggerSelection(fInputHandler)) return;
 623
 624   // Fill the "event-counting-container", it is needed to get the number of events remaining after each event-selection cut
 625   fHistos->FillEvent(centrality, AliUEHist::kCFStepTriggered);
 626
 627   // Vertex selection *************************************************
 628   if(!fAnalyseUE->VertexSelection(inputEvent, fnTracksVertex, fZVertex)) return;
 629
 630   // Fill the "event-counting-container", it is needed to get the number of events remaining after each event-selection cut
 631   fHistos->FillEvent(centrality, AliUEHist::kCFStepVertex);
 632
 633   // optimization
 634   if (centrality < 0 && !fCompareCentralities)
 635     return;
 636
 637   TObjArray* tracks = fAnalyseUE->GetAcceptedParticles(inputEvent, 0, kTRUE, -1, kTRUE);
 638   // create a list of reduced objects. This speeds up processing and reduces memory consumption for the event pool
 639   TObjArray* tracksClone = CloneAndReduceTrackList(tracks);
 640   delete tracks;
 641
 642   //Printf("Accepted %d tracks", tracks->GetEntries());
 643
 644   const AliVVertex* vertex = inputEvent->GetPrimaryVertex();
 645   Double_t zVtx = vertex->GetZ();
 646
 647   Float_t weight = 1;
 648   if (fFillpT)
 649     weight = -1;
 650
 651   // fill two different centralities (syst study)
 652   // the zvtx axis is used to distinguish the results of both centralities: configured centrality in zvtx = 0, SPD in zvtx = 2
 653   if (fCompareCentralities)
 654     zVtx = 0;
 655
 656   // Fill containers at STEP 6 (reconstructed)
 657   if (centrality >= 0)
 658   {
 659     if (!fSkipStep6)
 660       fHistos->FillCorrelations(centrality, zVtx, AliUEHist::kCFStepReconstructed, tracksClone, 0, weight);
 661
 662     ((TH1F*) fListOfHistos->FindObject("eventStat"))->Fill(1);
 663
 664     if (fTwoTrackEfficiencyCut)
 665       fHistos->FillCorrelations(centrality, zVtx, AliUEHist::kCFStepBiasStudy, tracksClone, 0, weight, kTRUE, kTRUE, bSign);
 666   }
 667
 668   // fill second time with SPD centrality
 669   if (fCompareCentralities && centralityObj)
 670   {
 671     centrality = centralityObj->GetCentralityPercentile("CL1");
 672     if (centrality >= 0 && !fSkipStep6)
 673       fHistos->FillCorrelations(centrality, 2, AliUEHist::kCFStepReconstructed, tracksClone, 0, weight);
 674   }
 675
 676   if (fFillMixed)
 677   {
 678     // event mixing
 679
 680     // 1. First get an event pool corresponding in mult (cent) and
 681     //    zvertex to the current event. Once initialized, the pool
 682     //    should contain nMix (reduced) events. This routine does not
 683     //    pre-scan the chain. The first several events of every chain
 684     //    will be skipped until the needed pools are filled to the
 685     //    specified depth. If the pool categories are not too rare, this
 686     //    should not be a problem. If they are rare, you could lose
 687     //    statistics.
 688
 689     // 2. Collect the whole pool's content of tracks into one TObjArray
 690     //    (bgTracks), which is effectively a single background super-event.
 691
 692     // 3. The reduced and bgTracks arrays must both be passed into
 693     //    FillCorrelations(). Also nMix should be passed in, so a weight
 694     //    of 1./nMix can be applied.
 695
 696     AliEventPool* pool = fPoolMgr->GetEventPool(centrality, zVtx);
 697
 698     if (!pool)
 699       AliFatal(Form("No pool found for centrality = %f, zVtx = %f", centrality, zVtx));
 700
 701     //pool->SetDebug(1);
 702
 703     if (pool->IsReady() || pool->NTracksInPool() > fMixingTracks / 10 || pool->GetCurrentNEvents() >= 5)
 704     {
 705
 706       Int_t nMix = pool->GetCurrentNEvents();
 707 //       cout << "nMix = " << nMix << " tracks in pool = " << pool->NTracksInPool() << endl;
 708
 709       ((TH1F*) fListOfHistos->FindObject("eventStat"))->Fill(2);
 710       ((TH2F*) fListOfHistos->FindObject("mixedDist"))->Fill(centrality, pool->NTracksInPool());
 711       if (pool->IsReady())
 712         ((TH1F*) fListOfHistos->FindObject("eventStat"))->Fill(3);
 713
 714       // Fill mixed-event histos here
 715       for (Int_t jMix=0; jMix<nMix; jMix++)
 716       {
 717         TObjArray* bgTracks = pool->GetEvent(jMix);
 718
 719         if (!fSkipStep6)
 720           fHistosMixed->FillCorrelations(centrality, zVtx, AliUEHist::kCFStepReconstructed, tracksClone, bgTracks, 1.0 / nMix, (jMix == 0));
 721
 722         if (fTwoTrackEfficiencyCut)
 723           fHistosMixed->FillCorrelations(centrality, zVtx, AliUEHist::kCFStepBiasStudy, tracksClone, bgTracks, 1.0 / nMix, (jMix == 0), kTRUE, bSign);
 724       }
 725     }
 726
 727     // ownership is with the pool now
 728     pool->UpdatePool(tracksClone);
 729     //pool->PrintInfo();
 730   }
 731   else
 732     delete tracksClone;
 733 }
 734
 735 TObjArray* AliAnalysisTaskPhiCorrelations::CloneAndReduceTrackList(TObjArray* tracks)
 736 {
 737   // clones a track list by using AliDPhiBasicParticle which uses much less memory (used for event mixing)
 738
 739   TObjArray* tracksClone = new TObjArray;
 740   tracksClone->SetOwner(kTRUE);
 741
 742   for (Int_t i=0; i<tracks->GetEntriesFast(); i++)
 743   {
 744     AliVParticle* particle = (AliVParticle*) tracks->At(i);
 745     tracksClone->Add(new AliDPhiBasicParticle(particle->Eta(), particle->Phi(), particle->Pt(), particle->Charge()));
 746   }
 747
 748   return tracksClone;
 749 }
 750
 751 //____________________________________________________________________
 752 void  AliAnalysisTaskPhiCorrelations::Initialize()
 753 {
 754   // input handler
 755   fInputHandler = (AliInputEventHandler*)
 756          ((AliAnalysisManager::GetAnalysisManager())->GetInputEventHandler());
 757   // MC handler
 758   fMcHandler = dynamic_cast<AliMCEventHandler*> (AliAnalysisManager::GetAnalysisManager()->GetMCtruthEventHandler());
 759 }