PWGCF/Correlations/Base/AliAnalysisTaskCFTree.cxx

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  15
  16 // Analysis task to produce trees of lightweight events
  17 // evgeny.kryshen@cern.ch
  18
  19 // aliroot
  20 #include "AliAnalysisTaskCFTree.h"
  21 #include "AliCFParticle.h"
  22 #include "AliAnalysisManager.h"
  23 #include "AliInputEventHandler.h"
  24 #include "AliESDEvent.h"
  25 #include "AliAODEvent.h"
  26 #include "AliMCEvent.h"
  27 #include "AliHeader.h"
  28 #include "AliESDHeader.h"
  29 #include "AliAODHeader.h"
  30 #include "AliAODMCHeader.h"
  31 #include "AliGenEventHeader.h"
  32 #include "AliGenCocktailEventHeader.h"
  33 #include "AliAODTrack.h"
  34 #include "AliESDtrack.h"
  35 #include "AliMCParticle.h"
  36 #include "AliAODMCParticle.h"
  37 #include "AliExternalTrackParam.h"
  38 #include "AliCentrality.h"
  39 #include "AliAnalysisFilter.h"
  40 #include "AliPIDResponse.h"
  41 #include "AliTPCPIDResponse.h"
  42 // root
  43 #include "TMath.h"
  44 #include "TFile.h"
  45 #include "TList.h"
  46 #include "TH1I.h"
  47 #include "TChain.h"
  48 #include "TTree.h"
  49 #include "TClonesArray.h"
  50 ClassImp(AliAnalysisTaskCFTree)
  51
  52 //-----------------------------------------------------------------------------
  53 AliAnalysisTaskCFTree::AliAnalysisTaskCFTree(const char* name) :
  54   AliAnalysisTask(name,""),
  55   fDebug(0),
  56   fMode(0),
  57   fInputHandler(0x0),
  58   fMcHandler(0x0),
  59   fTrackFilter(0x0),
  60   fHybridConstrainedMask(0),
  61   fTPConlyConstrainedMask(0),
  62   fPIDResponse(0x0),
  63   fListOfHistos(0x0),
  64   fEventStatistics(0x0),
  65   fTree(0x0),
  66   fParticles(0x0),
  67   fField(0),
  68   fCentrality(0),
  69   fZvtx(0),
  70   fRunNumber(0),
  71   fPeriod(0),
  72   fOrbit(),
  73   fBc(),
  74   fSelectMask(0),
  75   fSelectBit(AliVEvent::kMB),
  76   fZVertexCut(10.),
  77   fnTracksVertex(1),
  78   fCentralityMethod("V0M"),
  79   fTrackFilterBit(0xffffffff),
  80   fTrackEtaCut(1.0),
  81   fPtMin(0.15),
  82   fSharedClusterCut(0.4),
  83   fCrossedRowsCut(100),
  84   fFoundFractionCut(0.8)
  85 {
  86   Info("AliAnalysisTaskCFTree","Calling Constructor");
  87   DefineInput(0,TChain::Class());
  88   DefineOutput(0,TList::Class());
  89   DefineOutput(1,TTree::Class());
  90 }
  91 //-----------------------------------------------------------------------------
  92
  93
  94 //-----------------------------------------------------------------------------
  95 void AliAnalysisTaskCFTree::ConnectInputData(Option_t* /*option*/){
  96   fInputHandler = dynamic_cast<AliInputEventHandler*> (AliAnalysisManager::GetAnalysisManager()->GetInputEventHandler());
  97   fMcHandler    = dynamic_cast<AliInputEventHandler*> (AliAnalysisManager::GetAnalysisManager()->GetMCtruthEventHandler());
  98 }
  99 //-----------------------------------------------------------------------------
 100
 101
 102 //-----------------------------------------------------------------------------
 103 void AliAnalysisTaskCFTree::CreateOutputObjects(){
 104   fListOfHistos = new TList();
 105   fListOfHistos->SetOwner();
 106   fEventStatistics = new TH1I("fEventStatistics","",10,0,10);
 107   fEventStatistics->SetBit(TH1::kCanRebin);
 108
 109   fListOfHistos->Add(fEventStatistics);
 110
 111   fParticles = new TClonesArray("AliCFParticle",2000);
 112   // create file-resident tree
 113   TDirectory *owd = gDirectory;
 114   OpenFile(1);
 115   fTree = new TTree("events","events");
 116   owd->cd();
 117   fTree->Branch("cent",&fCentrality);
 118   fTree->Branch("zvtx",&fZvtx);
 119   fTree->Branch("field",&fField);
 120   fTree->Branch("run",&fRunNumber);
 121   fTree->Branch("period",&fPeriod);
 122   fTree->Branch("orbit",&fOrbit);
 123   fTree->Branch("bc",&fBc);
 124   fTree->Branch("mask",&fSelectMask);
 125   fTree->Branch("particles",&fParticles);
 126   PostData(0,fListOfHistos);
 127   PostData(1,fTree);
 128 }
 129 //-----------------------------------------------------------------------------
 130
 131
 132 //-----------------------------------------------------------------------------
 133 void AliAnalysisTaskCFTree::Exec(Option_t *){
 134   fParticles->Clear();
 135
 136   fEventStatistics->Fill("before cuts",1);
 137
 138   AliVEvent* event = fInputHandler->GetEvent();
 139   if (!event) return;
 140   fEventStatistics->Fill("after event check",1);
 141
 142   fPIDResponse = fInputHandler->GetPIDResponse();
 143
 144   fSelectMask = fInputHandler->IsEventSelected();
 145   if (!(fSelectMask & fSelectBit)) return;
 146   fEventStatistics->Fill("after trigger selection",1);
 147   fRunNumber  = event->GetRunNumber();
 148   fPeriod     = event->GetPeriodNumber();
 149   fOrbit      = event->GetOrbitNumber();
 150   fBc         = event->GetBunchCrossNumber();
 151   fField      = event->GetMagneticField();
 152   fCentrality = event->GetCentrality()->GetCentralityPercentile(fCentralityMethod);
 153
 154   if (fMode==0){ // Data analysis
 155     const AliVVertex* vertex  = event->GetPrimaryVertex();
 156     if (!vertex) return;
 157     fZvtx  = vertex->GetZ();
 158     TString name(vertex->GetName());
 159     if (name.CompareTo("PrimaryVertex") && name.CompareTo("SPDVertex")) return; // Reject TPC only vertex
 160     fEventStatistics->Fill("after rejection of TPC only vertex",1);
 161     if (TMath::Abs(fZvtx) >= fZVertexCut || vertex->GetNContributors()<fnTracksVertex)  return;
 162     fEventStatistics->Fill("after vertex selection",1);
 163
 164     for (Int_t ipart=0;ipart<event->GetNumberOfTracks();ipart++){
 165       AliVTrack* track = (AliVTrack*) event->GetTrack(ipart);
 166       if (!track) continue;
 167       UInt_t mask = GetFilterMap(track);
 168       if (!(mask & fTrackFilterBit)) continue;
 169
 170       if (track->InheritsFrom("AliAODTrack")) AddTrack(track,mask,0);
 171       else if (track->InheritsFrom("AliESDtrack")) {
 172         if (mask)                           AddTrack(track,mask,1);
 173         if (mask & fHybridConstrainedMask)  AddTrack(track,mask,2);
 174         if (mask & fTPConlyConstrainedMask) AddTrack(track,mask,3);
 175       }
 176     }
 177   }
 178   else { // MC analysis
 179     AliMCEvent* mcEvent = 0;
 180     TClonesArray* mcTracks = 0;
 181     Int_t nPrimGen = 0;
 182     Int_t nProduced = 0;
 183
 184     mcEvent = fMcHandler ? fMcHandler->MCEvent() : 0;
 185     mcTracks = (TClonesArray*) event->FindListObject(AliAODMCParticle::StdBranchName());
 186
 187     if (!mcEvent && !mcTracks) { printf("No mc object found\n"); return; }
 188     fEventStatistics->Fill("after mc objects check",1);
 189
 190     if (mcEvent) {
 191       AliHeader* header = (AliHeader*) mcEvent->Header();
 192       AliGenCocktailEventHeader* cocktailHeader = dynamic_cast<AliGenCocktailEventHeader*> (header->GenEventHeader());
 193       AliGenEventHeader* mcHeader = dynamic_cast<AliGenEventHeader*> (cocktailHeader ? cocktailHeader->GetHeaders()->First() : header->GenEventHeader());
 194       nProduced = mcEvent->GetNumberOfTracks();
 195       nPrimGen = mcHeader->NProduced();
 196       fZvtx = mcEvent->GetPrimaryVertex()->GetZ();
 197     } else if (mcTracks) {
 198       AliAODMCHeader* mcHeader = (AliAODMCHeader*) event->FindListObject(AliAODMCHeader::StdBranchName());
 199       if (!mcHeader) { printf("AliAODMCHeader not found\n"); return; }
 200       if (mcHeader->GetCocktailHeaders()) {
 201         AliGenEventHeader* header0 =  mcHeader->GetCocktailHeader(0);
 202         if (!header0) { printf("first header expected but not found\n"); return; }
 203         nPrimGen = header0->NProduced();
 204       } else  nPrimGen = nProduced;
 205       fZvtx = mcHeader->GetVtxZ();
 206     } else return;
 207     fEventStatistics->Fill("after mc header check",1);
 208
 209     if (TMath::Abs(fZvtx)>fZVertexCut) return;
 210     fEventStatistics->Fill("after MC vertex cut",1);
 211
 212     const AliVVertex* vertex = event->GetPrimaryVertex();
 213     if (!vertex) return;
 214     fEventStatistics->Fill("after check for vertex object",1);
 215     TString name(vertex->GetName());
 216     if (name.CompareTo("PrimaryVertex") && name.CompareTo("SPDVertex")) fZvtx=1000; // Reject TPC only vertex
 217     fEventStatistics->Fill("after rejection of TPC only vertex",1);
 218     if (vertex->GetNContributors()<fnTracksVertex)  fZvtx=-1000;
 219     fEventStatistics->Fill("after check for vertex contributors",1);
 220
 221     UInt_t* masks = new UInt_t[nProduced];
 222     for (Int_t i=0;i<nProduced;i++) masks[i]=0;
 223
 224     // Loop over reconstructed tracks to set masks
 225     for (Int_t ipart=0;ipart<event->GetNumberOfTracks();ipart++){
 226       AliVTrack* part = (AliVTrack*) event->GetTrack(ipart);
 227       if (!part) continue;
 228       Int_t label = TMath::Abs(part->GetLabel());
 229       if (label>=nProduced) continue;
 230       masks[label] |= GetFilterMap(part);
 231     }
 232
 233     // Loop over mc tracks to be stored
 234     for (Int_t ipart=0;ipart<nProduced;ipart++){
 235       AliVParticle* part = 0;
 236       Bool_t isPrimary = 0;
 237       if (mcTracks) { // AOD analysis
 238         AliAODMCParticle* particle = (AliAODMCParticle*) mcTracks->At(ipart);
 239         if (!particle) continue;
 240         // skip injected signals
 241         AliAODMCParticle* mother = particle;
 242         while (!mother->IsPrimary()) mother = (AliAODMCParticle*) mcTracks->At(mother->GetMother());
 243         if (mother->GetLabel()>=nPrimGen) continue;
 244         part = particle;
 245         // check for primary
 246         isPrimary = particle->IsPhysicalPrimary();
 247       } else { // ESD analysis
 248         AliMCParticle* particle = (AliMCParticle*) mcEvent->GetTrack(ipart);
 249         if (!particle) continue;
 250         // skip injected signals
 251         AliMCParticle* mother = particle;
 252         while (mother->GetMother()>=0) mother = (AliMCParticle*) mcEvent->GetTrack(mother->GetMother());
 253         if (mother->GetLabel()>=nPrimGen) continue;
 254         part = particle;
 255         // check for primary
 256         isPrimary = mcEvent->IsPhysicalPrimary(ipart);
 257       }
 258
 259       // store only primaries and all reconstructed (non-zero mask)
 260       Int_t mask = masks[ipart];
 261       if (isPrimary) mask |= (1 << 30);
 262       if (!mask) continue;
 263       AddTrack(part,mask);
 264     }
 265     delete[] masks;
 266   }
 267   fTree->Fill();
 268   PostData(0,fListOfHistos);
 269   PostData(1,fTree);
 270 }
 271 //-----------------------------------------------------------------------------
 272
 273
 274 //-----------------------------------------------------------------------------
 275 UInt_t AliAnalysisTaskCFTree::GetFilterMap(AliVParticle* particle){
 276   UInt_t mask = 0;
 277   if (particle->InheritsFrom("AliAODTrack")) {
 278     AliAODTrack* part = (AliAODTrack*) particle;
 279     mask = part->GetFilterMap();
 280     Double_t nCrossedRaws      = part->GetTPCNCrossedRows();
 281     Double_t nFindableClusters = part->GetTPCNclsF();
 282     Double_t nSharedClusters   = part->GetTPCnclsS();
 283     Double_t nClusters         = part->GetTPCncls();
 284     Bool_t itsRefit            = part->GetStatus() & AliVTrack::kITSrefit;
 285     if (nCrossedRaws/nFindableClusters > fFoundFractionCut) mask |= (1 << 26);
 286     if (nCrossedRaws>fCrossedRowsCut)                       mask |= (1 << 27);
 287     if (itsRefit)                                           mask |= (1 << 28);
 288     if (nSharedClusters/nClusters<=fSharedClusterCut)       mask |= (1 << 29);
 289     if (part->GetLabel()<0)                                 mask |= (1 << 31);
 290   } else if (particle->InheritsFrom("AliESDtrack")){
 291     AliESDtrack* part = (AliESDtrack*) particle;
 292     if (!fTrackFilter) AliFatal("Track filter undefined");
 293     mask |= fTrackFilter->IsSelected(part);
 294   }
 295
 296   return mask;
 297 }
 298 //-----------------------------------------------------------------------------
 299
 300
 301 //-----------------------------------------------------------------------------
 302 AliCFParticle* AliAnalysisTaskCFTree::AddTrack(AliVParticle* part, UInt_t mask, UInt_t flag){
 303
 304   // skip neutral mc particles
 305   Char_t charge = part->Charge();
 306   if (charge==0) return NULL;
 307
 308   // set pt,eta,phi
 309   Float_t pt=0,eta=0,phi=0;
 310   if (flag==0 || flag==1){ // AOD, MC or Global ESD tracks
 311     pt  = part->Pt();
 312     eta = part->Eta();
 313     phi = part->Phi();
 314     if  (flag==1) mask &= (~fHybridConstrainedMask) & (~fTPConlyConstrainedMask);
 315   }
 316   else if (flag==2) { // Hybrid constrained tracks (ESD)
 317     AliESDtrack* track = (AliESDtrack*) part;
 318     const AliExternalTrackParam* param = track->GetConstrainedParam();
 319     pt  = param->Pt();
 320     eta = param->Eta();
 321     phi = param->Phi();
 322     mask &= fHybridConstrainedMask;
 323   }
 324   else if (flag==3) { // TPC only constrained tracks (ESD)
 325     AliESDtrack* track = (AliESDtrack*) part;
 326     AliESDtrack tpcTrack;
 327     if (!track->FillTPCOnlyTrack(tpcTrack)) return NULL;
 328     AliExternalTrackParam param;
 329     const AliESDVertex* vtxSPD = ((AliESDEvent*) fInputHandler->GetEvent())->GetPrimaryVertexSPD();
 330     if (!tpcTrack.RelateToVertexTPC(vtxSPD,fField,1.e30,&param)) return NULL;
 331     pt  = param.Pt();
 332     eta = param.Eta();
 333     phi = param.Phi();
 334     mask &= fTPConlyConstrainedMask;
 335   }
 336
 337   // kinematic cuts
 338   if (pt < fPtMin || TMath::Abs(eta) > fTrackEtaCut) return NULL;
 339
 340   return new ((*fParticles)[fParticles->GetEntriesFast()]) AliCFParticle(pt,eta,phi,charge,mask);
 341 }