PWG1/global/AliAnalysisTaskVertexESD.cxx

   1 /**************************************************************************
   2  * Copyright(c) 1998-2009, 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  *                                                                        *
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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     *
  12  * about the suitability of this software for any purpose. It is          *
  13  * provided "as is" without express or implied warranty.                  *
  14  **************************************************************************/
  15
  16 //*************************************************************************
  17 // Class AliAnalysisTaskVertexESD
  18 // AliAnalysisTask to extract from ESD the information for the analysis
  19 // of the primary vertex reconstruction efficiency and resolution
  20 // (for MC events) and distributions (for real data). Three vertices:
  21 // - SPD tracklets
  22 // - ITS+TPC tracks
  23 // - TPC-only tracks
  24 //
  25 // Author: A.Dainese, andrea.dainese@pd.infn.it
  26 //*************************************************************************
  27
  28 #include <TChain.h>
  29 #include <TTree.h>
  30 #include <TNtuple.h>
  31 #include <TBranch.h>
  32 #include <TClonesArray.h>
  33 #include <TObjArray.h>
  34 #include <TH1F.h>
  35 #include <TH2F.h>
  36 #include <TCanvas.h>
  37 #include <TGraphAsymmErrors.h>
  38 #include <TFile.h>
  39
  40 #include "AliAnalysisTask.h"
  41 #include "AliAnalysisManager.h"
  42
  43 #include "AliMultiplicity.h"
  44 #include "AliVertexerTracks.h"
  45 #include "AliESDtrack.h"
  46 #include "AliExternalTrackParam.h"
  47 #include "AliESDVertex.h"
  48 #include "AliESDEvent.h"
  49 #include "AliESDInputHandler.h"
  50 #include "AliTrackReference.h"
  51 //#include "AliTriggerAnalysis.h"
  52
  53 #include "AliMCEventHandler.h"
  54 #include "AliMCEvent.h"
  55 #include "AliStack.h"
  56 #include "AliLog.h"
  57
  58 #include "AliGenEventHeader.h"
  59 #include "AliAnalysisTaskVertexESD.h"
  60
  61
  62 ClassImp(AliAnalysisTaskVertexESD)
  63
  64 //________________________________________________________________________
  65 AliAnalysisTaskVertexESD::AliAnalysisTaskVertexESD(const char *name) :
  66 AliAnalysisTaskSE(name),
  67   fCheckEventType(kTRUE),
  68   fReadMC(kFALSE),
  69   fRecoVtxTPC(kTRUE),
  70   fRecoVtxITSTPC(kTRUE),
  71   fRecoVtxITSTPCHalfEvent(kFALSE),
  72   fOnlyITSTPCTracks(kFALSE),
  73   fOnlyITSSATracks(kFALSE),
  74   fFillNtuple(kFALSE),
  75   fFillTreeBeamSpot(kFALSE),
  76   fESD(0),
  77   fOutput(0),
  78   fNtupleVertexESD(0),
  79   fhSPDVertexX(0),
  80   fhSPDVertexY(0),
  81   fhSPDVertexZ(0),
  82   fhTRKVertexX(0),
  83   fhTRKVertexY(0),
  84   fhTRKVertexZ(0),
  85   fhTPCVertexX(0),
  86   fhTPCVertexY(0),
  87   fhTPCVertexZ(0),
  88   fhTrackRefs(0),
  89   fTreeBeamSpot(0),
  90   fhTriggeredTrklets(0),
  91   fhSPD3DTrklets(0),
  92   fhSPDZTrklets(0),
  93   fhTRKTrklets(0),
  94   fhTRKcTrklets(0),
  95   fhTRKncTrklets(0),
  96   fhTPCTrklets(0),
  97   fhTPCcTrklets(0),
  98   fhTPCncTrklets(0),
  99   fhSPD3DZreco(0),
 100   fhSPDZZreco(0),
 101   fhSPDVertexXPile(0),
 102   fhSPDVertexYPile(0),
 103   fhSPDVertexZPile(0),
 104   fhSPDVertexDiffZPileContr2(0),
 105   fhSPDVertexDiffZPileContr3(0),
 106   fhSPDVertexDiffZPileContr4(0),
 107   fhSPDVertexDiffZPileContr5(0),
 108   fhSPDContributorsPile(0),
 109   fhSPDDispContributors(0)
 110 {
 111   // Constructor
 112
 113   // Define input and output slots here
 114   // Output slot #0 writes into a TList container
 115   DefineOutput(1, TList::Class());  //My private output
 116 }
 117 //________________________________________________________________________
 118 AliAnalysisTaskVertexESD::~AliAnalysisTaskVertexESD()
 119 {
 120   // Destructor
 121
 122   // histograms are in the output list and deleted when the output
 123   // list is deleted by the TSelector dtor
 124
 125   if (fOutput) {
 126     delete fOutput;
 127     fOutput = 0;
 128   }
 129 }
 130
 131
 132 //________________________________________________________________________
 133 void AliAnalysisTaskVertexESD::UserCreateOutputObjects()
 134 {
 135   // Create histograms
 136   // Called once
 137
 138   // Several histograms are more conveniently managed in a TList
 139   fOutput = new TList;
 140   fOutput->SetOwner();
 141
 142   fNtupleVertexESD = new TNtuple("fNtupleVertexESD","vertices","run:tstamp:bunchcross:triggered:dndygen:xtrue:ytrue:ztrue:xSPD:xerrSPD:ySPD:yerrSPD:zSPD:zerrSPD:ntrksSPD:SPD3D:dphiSPD:xTPC:xerrTPC:yTPC:yerrTPC:zTPC:zerrTPC:ntrksTPC:constrTPC:xTRK:xerrTRK:yTRK:yerrTRK:zTRK:zerrTRK:ntrksTRK:constrTRK:ntrklets:nESDtracks:nITSrefit5or6:nTPCin:nTPCinEta09:SPD0cls:xSPDp:xerrSPDp:ySPDp:yerrSPDp:zSPDp:zerrSPDp:ntrksSPDp:xTPCnc:xerrTPCnc:yTPCnc:yerrTPCnc:zTPCnc:zerrTPCnc:ntrksTPCnc:xTPCc:xerrTPCc:yTPCc:yerrTPCc:zTPCc:zerrTPCc:ntrksTPCc:xTRKnc:xerrTRKnc:yTRKnc:yerrTRKnc:zTRKnc:zerrTRKnc:ntrksTRKnc:xTRKc:xerrTRKc:yTRKc:yerrTRKc:zTRKc:zerrTRKc:ntrksTRKc:deltaxTRKnc:deltayTRKnc:deltazTRKnc:deltaxerrTRKnc:deltayerrTRKnc:deltazerrTRKnc:ntrksEvenTRKnc:ntrksOddTRKnc");
 143
 144   fOutput->Add(fNtupleVertexESD);
 145
 146   fhSPDVertexX = new TH1F("fhSPDVertexX","SPDVertex x; x vertex [cm]; events",200,-1,1);
 147   fOutput->Add(fhSPDVertexX);
 148   fhSPDVertexY = new TH1F("fhSPDVertexY","SPDVertex y; y vertex [cm]; events",200,-1,1);
 149   fOutput->Add(fhSPDVertexY);
 150   fhSPDVertexZ = new TH1F("fhSPDVertexZ","SPDVertex z; z vertex [cm]; events",200,-20,20);
 151   fOutput->Add(fhSPDVertexZ);
 152   fhTRKVertexX = new TH1F("fhTRKVertexX","TRKVertex x; x vertex [cm]; events",200,-1,1);
 153   fOutput->Add(fhTRKVertexX);
 154   fhTRKVertexY = new TH1F("fhTRKVertexY","TRKVertex y; y vertex [cm]; events",200,-1,1);
 155   fOutput->Add(fhTRKVertexY);
 156   fhTRKVertexZ = new TH1F("fhTRKVertexZ","TRKVertex z; z vertex [cm]; events",200,-20,20);
 157   fOutput->Add(fhTRKVertexZ);
 158   fhTPCVertexX = new TH1F("fhTPCVertexX","TPCVertex x; x vertex [cm]; events",200,-3,3);
 159   fOutput->Add(fhTPCVertexX);
 160   fhTPCVertexY = new TH1F("fhTPCVertexY","TPCVertex y; y vertex [cm]; events",200,-3,3);
 161   fOutput->Add(fhTPCVertexY);
 162   fhTPCVertexZ = new TH1F("fhTPCVertexZ","TPCVertex z; z vertex [cm]; events",200,-20,20);
 163   fOutput->Add(fhTPCVertexZ);
 164
 165
 166   fhSPDVertexXPile = new TH1F("fhSPDVertexXPile","SPDVertexPile x; x vertex [cm]; events",200,-20,20);
 167   fOutput->Add(fhSPDVertexXPile);
 168   fhSPDVertexYPile = new TH1F("fhSPDVertexYPile","SPDVertexPile y; y vertex [cm]; events",200,-20,20);
 169   fOutput->Add(fhSPDVertexYPile);
 170   fhSPDVertexZPile = new TH1F("fhSPDVertexZPile","SPDVertexPile z; z vertex [cm]; events",200,-40,40);
 171   fOutput->Add(fhSPDVertexZPile);
 172
 173   fhSPDVertexDiffZPileContr2 = new TH1F("fhSPDVertexDiffZPileContr2","SPDVertexDiff z; zmain - zdiff [cm]; events",2000,-100,100);
 174   fOutput->Add(fhSPDVertexDiffZPileContr2);
 175   fhSPDVertexDiffZPileContr3 = new TH1F("fhSPDVertexDiffZPileContr3","SPDVertexDiff z; zmain - zdiff [cm]; events",2000,-100,100);
 176   fOutput->Add(fhSPDVertexDiffZPileContr3);
 177   fhSPDVertexDiffZPileContr4 = new TH1F("fhSPDVertexDiffZPileContr4","SPDVertexDiff z; zmain - zdiff [cm]; events",2000,-100,100);
 178   fOutput->Add(fhSPDVertexDiffZPileContr4);
 179   fhSPDVertexDiffZPileContr5 = new TH1F("fhSPDVertexDiffZPileContr5","SPDVertexDiff z; zmain - zdiff [cm]; events",2000,-100,100);
 180   fOutput->Add(fhSPDVertexDiffZPileContr5);
 181
 182   fhTrackRefs = new TH2F("fhTrackRefs","Track references; x; y",1000,-4,4,1000,-4,4);
 183   fOutput->Add(fhTrackRefs);
 184
 185   fTreeBeamSpot = new TTree("fTreeBeamSpot", "BeamSpotTree");
 186   UShort_t triggered, ntrkletsS, ntrksTRKnc;
 187   UInt_t run, bx;
 188   Float_t cetTimeLHC,xTRKnc, yTRKnc, zTRKnc;
 189   fTreeBeamSpot->Branch("run", &run, "run/i");
 190   fTreeBeamSpot->Branch("cetTimeLHC", &cetTimeLHC, "cetTimeLHC/F");
 191   fTreeBeamSpot->Branch("bx", &bx, "bx/i");
 192   fTreeBeamSpot->Branch("triggered", &triggered, "triggered/s");
 193   fTreeBeamSpot->Branch("ntrkletsS", &ntrkletsS, "ntrkletsS/s");
 194   fTreeBeamSpot->Branch("xTRKnc", &xTRKnc, "xTRKnc/F");
 195   fTreeBeamSpot->Branch("yTRKnc", &yTRKnc, "yTRKnc/F");
 196   fTreeBeamSpot->Branch("zTRKnc", &zTRKnc, "zTRKnc/F");
 197   fTreeBeamSpot->Branch("ntrksTRKnc", &ntrksTRKnc, "ntrksTRKnc/s");
 198   fOutput->Add(fTreeBeamSpot);
 199
 200   Int_t nbinTrklets=29;
 201   Float_t lowTrklets[30]={-0.5,0.5,1.5,2.5,3.5,4.5,5.5,7.5,10.5,25.5,50.5,75.5,100.5,150.5,200.5,300.5,400.5,500.5,600.5,800.5,1000.5,1500.5,2000.5,2500.5,3000.5,4000.5,5000.5,6000.5,8000.5,10000.5};
 202   fhTriggeredTrklets = new TH1F("fhTriggeredTrklets","trklets dist for triggered ev.; ntrklets; entries",nbinTrklets,lowTrklets);
 203   fOutput->Add(fhTriggeredTrklets);
 204   fhSPD3DTrklets = new TH1F("fhSPD3DTrklets","trklets dist for SPD3D ev.; ntrklets; entries",nbinTrklets,lowTrklets);
 205   fOutput->Add(fhSPD3DTrklets);
 206   fhSPDZTrklets = new TH1F("fhSPDZTrklets","trklets dist for SPDZ ev.; ntrklets; entries",nbinTrklets,lowTrklets);
 207   fOutput->Add(fhSPDZTrklets);
 208   fhTRKTrklets = new TH1F("fhTRKTrklets","trklets dist for TRK ev.; ntrklets; entries",nbinTrklets,lowTrklets);
 209   fOutput->Add(fhTRKTrklets);
 210   fhTRKcTrklets = new TH1F("fhTRKcTrklets","trklets dist for TRKc ev.; ntrklets; entries",nbinTrklets,lowTrklets);
 211   fOutput->Add(fhTRKcTrklets);
 212   fhTRKncTrklets = new TH1F("fhTRKncTrklets","trklets dist for TRKnc ev.; ntrklets; entries",nbinTrklets,lowTrklets);
 213   fOutput->Add(fhTRKncTrklets);
 214   fhTPCTrklets = new TH1F("fhTPCTrklets","trklets dist for TPC ev.; ntrklets; entries",nbinTrklets,lowTrklets);
 215   fOutput->Add(fhTPCTrklets);
 216   fhTPCcTrklets = new TH1F("fhTPCcTrklets","trklets dist for TPCc ev.; ntrklets; entries",nbinTrklets,lowTrklets);
 217   fOutput->Add(fhTPCcTrklets);
 218   fhTPCncTrklets = new TH1F("fhTPCncTrklets","trklets dist for TPCnc ev.; ntrklets; entries",nbinTrklets,lowTrklets);
 219   fOutput->Add(fhTPCncTrklets);
 220
 221   Int_t nbinZreco = 16;
 222   Double_t lowZreco[17]={-15.0,-10.0,-7.0,-5,-4,-3,-2,-1,0,1,2,3,4,5,7,10,15};
 223   fhSPD3DZreco = new TH1F("fhSPD3DZreco","Zreco dist for SPD3D ev.; Zreco [cm]; entries",nbinZreco,lowZreco);
 224   fOutput->Add(fhSPD3DZreco);
 225   fhSPDZZreco = new TH1F("fhSPDZZreco","Zreco dist for SPDZ ev.; Zreco [cm]; entries",nbinZreco,lowZreco);
 226   fOutput->Add(fhSPDZZreco);
 227
 228   fhSPDContributorsPile = new TH1F("fhSPDContributorsPile","ncontributors pile up vertex; ncontributors; entries",200,-0.5,199.5);
 229   fOutput->Add(fhSPDContributorsPile);
 230
 231   fhSPDDispContributors = new TH2F("fhSPDDispContributors","ncontributors main-pile; ncontributors main; ncontributors pile",200,-0.5,199.5,200,-0.5,199.5);
 232   fOutput->Add(fhSPDDispContributors);
 233
 234   PostData(1, fOutput);
 235
 236   return;
 237 }
 238
 239 //________________________________________________________________________
 240 void AliAnalysisTaskVertexESD::UserExec(Option_t *)
 241 {
 242   // Main loop
 243   // Called for each event
 244
 245   if (!InputEvent()) {
 246     Printf("ERROR: fESD not available");
 247     return;
 248   }
 249   AliESDEvent* esdE = (AliESDEvent*) InputEvent();
 250
 251   // Select PHYSICS events (type=7, for data) and MC events (type=0)
 252   // fCheckEventType is kFALSE if fReadMC is kTRUE, hence check is skipped
 253   if(fCheckEventType) {
 254     if(esdE->GetEventType()!=7 && esdE->GetEventType()!=0) return;
 255   }
 256
 257
 258   TArrayF mcVertex(3);
 259   mcVertex[0]=9999.; mcVertex[1]=9999.; mcVertex[2]=9999.;
 260   Float_t dNchdy=-999.;
 261   // ***********  MC info ***************
 262   if (fReadMC) {
 263     AliMCEventHandler* eventHandler = dynamic_cast<AliMCEventHandler*> (AliAnalysisManager::GetAnalysisManager()->GetMCtruthEventHandler());
 264     if (!eventHandler) {
 265       Printf("ERROR: Could not retrieve MC event handler");
 266       return;
 267     }
 268
 269     AliMCEvent* mcEvent = eventHandler->MCEvent();
 270     if (!mcEvent) {
 271       Printf("ERROR: Could not retrieve MC event");
 272       return;
 273     }
 274
 275     AliStack* stack = mcEvent->Stack();
 276     if (!stack) {
 277       AliDebug(AliLog::kError, "Stack not available");
 278       return;
 279     }
 280
 281     AliHeader* header = mcEvent->Header();
 282     if (!header) {
 283       AliDebug(AliLog::kError, "Header not available");
 284       return;
 285     }
 286     AliGenEventHeader* genHeader = header->GenEventHeader();
 287     genHeader->PrimaryVertex(mcVertex);
 288
 289     Int_t ngenpart = (Int_t)stack->GetNtrack();
 290     //printf("# generated particles = %d\n",ngenpart);
 291     dNchdy=0;
 292     for(Int_t ip=0; ip<ngenpart; ip++) {
 293       TParticle* part = (TParticle*)stack->Particle(ip);
 294       // keep only electorns, muons, pions, kaons and protons
 295       Int_t apdg = TMath::Abs(part->GetPdgCode());
 296       if(apdg!=11 && apdg!=13 && apdg!=211 && apdg!=321 && apdg!=2212) continue;
 297       // reject secondaries
 298       if(TMath::Sqrt((part->Vx()-mcVertex[0])*(part->Vx()-mcVertex[0])+(part->Vy()-mcVertex[1])*(part->Vy()-mcVertex[1]))>0.0010) continue;
 299       // reject incoming protons
 300       Double_t energy  = part->Energy();
 301       if(energy>900.) continue;
 302       Double_t pz = part->Pz();
 303       Double_t y = 0.5*TMath::Log((energy+pz+1.e-13)/(energy-pz+1.e-13));
 304       if(TMath::Abs(y)<1.0) dNchdy += 0.5; // count 1/2 of particles in |y|<1
 305       // tracks refs
 306       TClonesArray *trefs=0;
 307       Int_t ntrefs = mcEvent->GetParticleAndTR(ip,part,trefs);
 308       if(ntrefs<0) continue;
 309       for(Int_t iref=0; iref<ntrefs; iref++) {
 310         AliTrackReference *tref = (AliTrackReference*)trefs->At(iref);
 311         if(tref->R()>10.) continue;
 312         fhTrackRefs->Fill(tref->X(),tref->Y());
 313       }
 314     }
 315     //printf("# primary particles = %7.1f\n",dNchdy);
 316   }
 317   // ***********  MC info ***************
 318
 319
 320   // Trigger
 321   //ULong64_t triggerMask;
 322   //ULong64_t spdFO = (1 << 14);
 323   //ULong64_t v0left = (1 << 10);
 324   //ULong64_t v0right = (1 << 11);
 325
 326   //triggerMask=esdE->GetTriggerMask();
 327   // MB1: SPDFO || V0L || V0R
 328   //Bool_t eventTriggered = (triggerMask & spdFO || ((triggerMask & v0left) || (triggerMask & v0right)));
 329   //MB2: GFO && V0R
 330   //triggerMask & spdFO && ((triggerMask&v0left) || (triggerMask&v0right))
 331   //Bool_t eventTriggered = (triggerMask & spdFO);
 332
 333   //static AliTriggerAnalysis* triggerAnalysis = new AliTriggerAnalysis();
 334   Bool_t eventTriggered = 0;//triggerAnalysis->IsTriggerFired(esdE, AliTriggerAnalysis::kSPDGFO /*| AliTriggerAnalysis::kOfflineFlag*/);
 335
 336   // use response of AliPhysicsSelection
 337   eventTriggered = ((AliInputEventHandler*)(AliAnalysisManager::GetAnalysisManager()->GetInputEventHandler()))->IsEventSelected();
 338
 339
 340   Int_t nInFile = esdE->GetEventNumberInFile();
 341
 342  const AliMultiplicity *alimult = esdE->GetMultiplicity();
 343   Int_t ntrklets=0,spd0cls=0;
 344   if(alimult) {
 345     ntrklets = alimult->GetNumberOfTracklets();
 346
 347     for(Int_t l=0;l<alimult->GetNumberOfTracklets();l++){
 348       if(alimult->GetDeltaPhi(l)<-9998.) ntrklets--;
 349     }
 350     spd0cls = alimult->GetNumberOfSingleClusters()+ntrklets;
 351   }
 352
 353
 354   UShort_t triggered, ntrkletsS, ntrksTRKnc;
 355   UInt_t run, bx;
 356   Float_t cetTimeLHC,xTRKnc, yTRKnc, zTRKnc;
 357   fTreeBeamSpot->SetBranchAddress("run", &run);
 358   fTreeBeamSpot->SetBranchAddress("cetTimeLHC", &cetTimeLHC);
 359   fTreeBeamSpot->SetBranchAddress("bx", &bx);
 360   fTreeBeamSpot->SetBranchAddress("triggered", &triggered);
 361   fTreeBeamSpot->SetBranchAddress("ntrkletsS", &ntrkletsS);
 362   fTreeBeamSpot->SetBranchAddress("xTRKnc", &xTRKnc);
 363   fTreeBeamSpot->SetBranchAddress("yTRKnc", &yTRKnc);
 364   fTreeBeamSpot->SetBranchAddress("zTRKnc", &zTRKnc);
 365   fTreeBeamSpot->SetBranchAddress("ntrksTRKnc", &ntrksTRKnc);
 366
 367
 368   Double_t tstamp = esdE->GetTimeStamp();
 369   Float_t cetTime =(tstamp-1262304000.)+7200.;
 370
 371   Float_t cetTime1h =(tstamp-1262304000.)+3600.;
 372
 373   cetTimeLHC = (Float_t)cetTime1h;
 374
 375   Int_t ntracks = esdE->GetNumberOfTracks();
 376   Int_t nITS5or6=0,nTPCin=0,nTPCinEta09=0;
 377   //printf("Tracks # = %d\n",esdE->GetNumberOfTracks());
 378   for(Int_t itr=0; itr<ntracks; itr++) {
 379     AliESDtrack *t = esdE->GetTrack(itr);
 380     if(t->GetNcls(0)>=5) nITS5or6++;
 381     Double_t z0; t->GetZAt(0,esdE->GetMagneticField(),z0);
 382     if(t->GetNcls(1)>0 && TMath::Abs(t->GetD(0,0,esdE->GetMagneticField()))<2.8 && TMath::Abs(z0)<20) {
 383       nTPCin++;
 384       if(TMath::Abs(t->GetTgl())<1.5) nTPCinEta09++;
 385     }
 386   }
 387
 388
 389   const AliESDVertex *spdv=esdE->GetPrimaryVertexSPD();
 390   const AliESDVertex *spdvp=esdE->GetPileupVertexSPD(0);
 391   const AliESDVertex *tpcv=esdE->GetPrimaryVertexTPC();
 392   const AliESDVertex *trkv=esdE->GetPrimaryVertexTracks();
 393
 394   // fill histos
 395
 396   if(spdv) {
 397     if(spdv->GetNContributors()>0) {
 398       TString title=spdv->GetTitle();
 399       if(title.Contains("3D")) {
 400         fhSPDVertexX->Fill(spdv->GetXv());
 401         fhSPDVertexY->Fill(spdv->GetYv());
 402       }
 403       fhSPDVertexZ->Fill(spdv->GetZv());
 404     }
 405   }
 406
 407   if(trkv) {
 408     if(trkv->GetNContributors()>0) {
 409       fhTRKVertexX->Fill(trkv->GetXv());
 410       fhTRKVertexY->Fill(trkv->GetYv());
 411       fhTRKVertexZ->Fill(trkv->GetZv());
 412     }
 413   }
 414
 415   if(tpcv) {
 416     if(tpcv->GetNContributors()>0) {
 417       fhTPCVertexX->Fill(tpcv->GetXv());
 418       fhTPCVertexY->Fill(tpcv->GetYv());
 419       fhTPCVertexZ->Fill(tpcv->GetZv());
 420     }
 421   }
 422
 423
 424
 425    /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 426   // filling Vertex reco efficiency plots
 427
 428   if(eventTriggered ? 1. : 0.){
 429     fhTriggeredTrklets->Fill(ntrklets);
 430
 431     if(spdv){
 432       if(spdv->GetNContributors()>0.5){
 433         TString spdtitle = spdv->GetTitle();
 434         if(spdtitle.Contains("vertexer: 3D") ? 1. : 0.){
 435           fhSPD3DTrklets->Fill(ntrklets);
 436           fhSPD3DZreco->Fill(spdv->GetZv());
 437         }
 438         else{
 439           fhSPDZTrklets->Fill(ntrklets);
 440           fhSPDZZreco->Fill(spdv->GetZv());
 441         }
 442       }
 443     }
 444
 445     if(trkv){
 446       if(trkv->GetNContributors()>0.5)fhTRKTrklets->Fill(ntrklets);
 447     }
 448     if(fRecoVtxITSTPC) {
 449       AliESDVertex *trkvc = ReconstructPrimaryVertexITSTPC(kTRUE);
 450       if(trkvc->GetNContributors()>0.5)fhTRKcTrklets->Fill(ntrklets);
 451       delete trkvc; trkvc=0;
 452       AliESDVertex *trkvnc = ReconstructPrimaryVertexITSTPC(kFALSE);
 453       if(trkvnc->GetNContributors()>0.5)fhTRKncTrklets->Fill(ntrklets);
 454       delete trkvnc; trkvnc=0;
 455     }
 456
 457     if(tpcv){
 458       if(tpcv->GetNContributors()>0.5)fhTPCTrklets->Fill(ntrklets);
 459     }
 460     if(fRecoVtxTPC) {
 461         AliESDVertex *tpcvc = ReconstructPrimaryVertexTPC(kTRUE);
 462         if(tpcvc->GetNContributors()>0.5)fhTPCcTrklets->Fill(ntrklets);
 463         delete tpcvc; tpcvc=0;
 464         AliESDVertex *tpcvnc = ReconstructPrimaryVertexTPC(kFALSE);
 465         if(tpcvnc->GetNContributors()>0.5)fhTPCncTrklets->Fill(ntrklets);
 466         delete tpcvnc; tpcvnc=0;
 467       }
 468   }
 469   /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 470
 471   Float_t xpile=-999.;
 472   Float_t ypile=-999.;
 473   Float_t zpile=-999.;
 474   Float_t expile=-999.;
 475   Float_t eypile=-999.;
 476   Float_t ezpile=-999.;
 477   Int_t ntrkspile=-1;
 478
 479   if(esdE->GetNumberOfPileupVerticesSPD()>0 && spdvp && spdv){
 480
 481     if(spdvp->GetNContributors()>0) {
 482
 483           fhSPDVertexXPile->Fill(spdvp->GetXv());
 484           fhSPDVertexYPile->Fill(spdvp->GetYv());
 485       fhSPDContributorsPile->Fill(spdvp->GetNContributors());
 486       fhSPDDispContributors->Fill(spdv->GetNContributors(),spdvp->GetNContributors());
 487       fhSPDVertexZPile->Fill(spdvp->GetZv());
 488       if(spdvp->GetNContributors()>=2) {fhSPDVertexDiffZPileContr2->Fill(spdv->GetZv()-spdvp->GetZv());}
 489       if(spdvp->GetNContributors()>=3) {fhSPDVertexDiffZPileContr3->Fill(spdv->GetZv()-spdvp->GetZv());}
 490       if(spdvp->GetNContributors()>=4) {fhSPDVertexDiffZPileContr4->Fill(spdv->GetZv()-spdvp->GetZv());}
 491       if(spdvp->GetNContributors()>=5) {fhSPDVertexDiffZPileContr5->Fill(spdv->GetZv()-spdvp->GetZv());}
 492
 493     }
 494
 495     xpile=spdvp->GetXv();
 496     expile=spdvp->GetXRes();
 497     ypile=spdvp->GetYv();
 498     eypile=spdvp->GetYRes();
 499     zpile=spdvp->GetZv();
 500     ezpile=spdvp->GetZRes();
 501     ntrkspile=spdvp->GetNContributors();
 502   }
 503
 504   // fill ntuple
 505   Int_t isize=82;
 506   Float_t xnt[82]; for(Int_t iii=0;iii<isize;iii++) xnt[iii]=0.;
 507
 508   Int_t isizeSecNt=9;
 509   Float_t secnt[9]; for(Int_t iii=0;iii<isizeSecNt;iii++) secnt[iii]=0.;
 510
 511   Int_t index=0;
 512   Int_t indexSecNt=0;
 513
 514   xnt[index++]=(Float_t)esdE->GetRunNumber();
 515   secnt[indexSecNt++]=(Float_t)esdE->GetRunNumber();
 516   run = (Int_t)esdE->GetRunNumber();
 517
 518   xnt[index++]=cetTime; //(Float_t)esdE->GetTimeStamp();
 519   //secnt[indexSecNt++]=cetTime;
 520   secnt[indexSecNt++]=cetTime1h;
 521
 522   xnt[index++]=(Float_t)esdE->GetBunchCrossNumber();
 523   secnt[indexSecNt++]=(Float_t)esdE->GetBunchCrossNumber();
 524   bx = (Int_t)esdE->GetBunchCrossNumber();
 525
 526   xnt[index++]=(eventTriggered ? 1. : 0.);
 527   secnt[indexSecNt++]=(eventTriggered ? 1. : 0.);
 528   triggered = (UShort_t)(eventTriggered ? 1 : 0);
 529
 530   xnt[index++]=(Float_t)dNchdy;
 531
 532   xnt[index++]=mcVertex[0];
 533   xnt[index++]=mcVertex[1];
 534   xnt[index++]=mcVertex[2];
 535
 536   xnt[index++]=spdv->GetXv();
 537   xnt[index++]=spdv->GetXRes();
 538   xnt[index++]=spdv->GetYv();
 539   xnt[index++]=spdv->GetYRes();
 540   xnt[index++]=spdv->GetZv();
 541   xnt[index++]=spdv->GetZRes();
 542   xnt[index++]=spdv->GetNContributors();
 543   TString spdtitle = spdv->GetTitle();
 544   xnt[index++]=(spdtitle.Contains("vertexer: 3D") ? 1. : 0.);
 545   xnt[index++]=spdv->GetDispersion();
 546
 547   xnt[index++]=tpcv->GetXv();
 548   xnt[index++]=tpcv->GetXRes();
 549   xnt[index++]=tpcv->GetYv();
 550   xnt[index++]=tpcv->GetYRes();
 551   xnt[index++]=tpcv->GetZv();
 552   xnt[index++]=tpcv->GetZRes();
 553   xnt[index++]=tpcv->GetNContributors();
 554   TString tpctitle = tpcv->GetTitle();
 555   xnt[index++]=(tpctitle.Contains("WithConstraint") ? 1. : 0.);
 556
 557   xnt[index++]=trkv->GetXv();
 558   xnt[index++]=trkv->GetXRes();
 559   xnt[index++]=trkv->GetYv();
 560   xnt[index++]=trkv->GetYRes();
 561   xnt[index++]=trkv->GetZv();
 562   xnt[index++]=trkv->GetZRes();
 563   xnt[index++]=trkv->GetNContributors();// tpccontrorig;
 564   TString trktitle = trkv->GetTitle();
 565   xnt[index++]=(trktitle.Contains("WithConstraint") ? 1. : 0.);
 566
 567   xnt[index++]=float(ntrklets);
 568   secnt[indexSecNt++]=float(ntrklets);
 569   ntrkletsS = (UShort_t)ntrklets;
 570
 571   xnt[index++]=float(ntracks);
 572   xnt[index++]=float(nITS5or6);
 573
 574   xnt[index++]=float(nTPCin);
 575   xnt[index++]=float(nTPCinEta09);
 576
 577   xnt[index++]=spd0cls;
 578
 579   xnt[index++]=xpile;
 580   xnt[index++]=expile;
 581   xnt[index++]=ypile;
 582   xnt[index++]=eypile;
 583   xnt[index++]=zpile;
 584   xnt[index++]=ezpile;
 585   xnt[index++]=(Float_t)ntrkspile;
 586
 587
 588
 589   // add recalculated vertices TRK and TPC
 590
 591   if(fRecoVtxTPC) {
 592     AliESDVertex *tpcvnc = ReconstructPrimaryVertexTPC(kFALSE);
 593     xnt[index++]=tpcvnc->GetXv();
 594     xnt[index++]=tpcvnc->GetXRes();
 595     xnt[index++]=tpcvnc->GetYv();
 596     xnt[index++]=tpcvnc->GetYRes();
 597     xnt[index++]=tpcvnc->GetZv();
 598     xnt[index++]=tpcvnc->GetZRes();
 599     xnt[index++]=tpcvnc->GetNContributors();
 600     delete tpcvnc; tpcvnc=0;
 601
 602     AliESDVertex *tpcvc = ReconstructPrimaryVertexTPC(kTRUE);
 603     xnt[index++]=tpcvc->GetXv();
 604     xnt[index++]=tpcvc->GetXRes();
 605     xnt[index++]=tpcvc->GetYv();
 606     xnt[index++]=tpcvc->GetYRes();
 607     xnt[index++]=tpcvc->GetZv();
 608     xnt[index++]=tpcvc->GetZRes();
 609     xnt[index++]=tpcvc->GetNContributors();
 610     delete tpcvc; tpcvc=0;
 611   } else index+=14;
 612
 613   if(fRecoVtxITSTPC) {
 614     AliESDVertex *trkvnc = ReconstructPrimaryVertexITSTPC(kFALSE);
 615     xnt[index++]=trkvnc->GetXv();
 616     xnt[index++]=trkvnc->GetXRes();
 617     xnt[index++]=trkvnc->GetYv();
 618     xnt[index++]=trkvnc->GetYRes();
 619     xnt[index++]=trkvnc->GetZv();
 620     xnt[index++]=trkvnc->GetZRes();
 621     xnt[index++]=trkvnc->GetNContributors();
 622
 623     secnt[indexSecNt++]=trkvnc->GetXv();
 624     secnt[indexSecNt++]=trkvnc->GetYv();
 625     secnt[indexSecNt++]=trkvnc->GetZv();
 626     secnt[indexSecNt++]=trkvnc->GetNContributors();
 627
 628     xTRKnc = (Float_t)trkvnc->GetXv();
 629     yTRKnc = (Float_t)trkvnc->GetYv();
 630     zTRKnc = (Float_t)trkvnc->GetZv();
 631     ntrksTRKnc = (trkvnc->GetNContributors()<0 ? 0 : (UShort_t)trkvnc->GetNContributors());
 632
 633     delete trkvnc; trkvnc=0;
 634
 635
 636     AliESDVertex *trkvc = ReconstructPrimaryVertexITSTPC(kTRUE);
 637     xnt[index++]=trkvc->GetXv();
 638     xnt[index++]=trkvc->GetXRes();
 639     xnt[index++]=trkvc->GetYv();
 640     xnt[index++]=trkvc->GetYRes();
 641     xnt[index++]=trkvc->GetZv();
 642     xnt[index++]=trkvc->GetZRes();
 643     xnt[index++]=trkvc->GetNContributors();
 644     delete trkvc; trkvc=0;
 645   } else index+=14;
 646
 647   if(fRecoVtxITSTPCHalfEvent) {
 648     AliESDVertex *trkvncodd  = ReconstructPrimaryVertexITSTPC(kFALSE,1);
 649     AliESDVertex *trkvnceven = ReconstructPrimaryVertexITSTPC(kFALSE,2);
 650     if(trkvncodd->GetNContributors()>0 &&
 651        trkvnceven->GetNContributors()>0) {
 652       xnt[index++]=trkvncodd->GetXv()-trkvnceven->GetXv();
 653       xnt[index++]=trkvncodd->GetYv()-trkvnceven->GetYv();
 654       xnt[index++]=trkvncodd->GetZv()-trkvnceven->GetZv();
 655       xnt[index++]=TMath::Sqrt(trkvncodd->GetXRes()*trkvncodd->GetXRes()+trkvnceven->GetXRes()*trkvnceven->GetXRes());
 656       xnt[index++]=TMath::Sqrt(trkvncodd->GetYRes()*trkvncodd->GetYRes()+trkvnceven->GetYRes()*trkvnceven->GetYRes());
 657       xnt[index++]=TMath::Sqrt(trkvncodd->GetZRes()*trkvncodd->GetZRes()+trkvnceven->GetZRes()*trkvnceven->GetZRes());
 658       xnt[index++]=trkvnceven->GetNContributors();
 659       xnt[index++]=trkvncodd->GetNContributors();
 660     } else {
 661       xnt[index++]=0.;
 662       xnt[index++]=0.;
 663       xnt[index++]=0.;
 664       xnt[index++]=0.;
 665       xnt[index++]=0.;
 666       xnt[index++]=0.;
 667       xnt[index++]=-1;
 668       xnt[index++]=-1;
 669     }
 670     delete trkvncodd; trkvncodd=0;
 671     delete trkvnceven; trkvnceven=0;
 672   } else index+=8;
 673
 674
 675   if(index>isize) printf("AliAnalysisTaskVertexESD: ERROR, index!=isize\n");
 676   if(fFillNtuple) fNtupleVertexESD->Fill(xnt);
 677
 678   if(indexSecNt>isizeSecNt) printf("AliAnalysisTaskVertexESD: ERROR, indexSecNt!=isizeSecNt\n");
 679
 680   // if(indexTree>isizeTree) printf("AliAnalysisTaskVertexESD: ERROR, indexTree!=isizeTree\n");
 681   // only every second event (to reduce output size)
 682   if(fFillTreeBeamSpot && (nInFile%2 == 0)) fTreeBeamSpot->Fill();
 683
 684
 685   // Post the data already here
 686   PostData(1, fOutput);
 687
 688   return;
 689 }
 690
 691 //________________________________________________________________________
 692 void AliAnalysisTaskVertexESD::Terminate(Option_t *)
 693 {
 694   // Draw result to the screen
 695   // Called once at the end of the query
 696   fOutput = dynamic_cast<TList*> (GetOutputData(1));
 697   if (!fOutput) {
 698     Printf("ERROR: fOutput not available");
 699     return;
 700   }
 701
 702   //////////////////////////////////////////////////////
 703   /*
 704   TH1F *fhTriggeredTrklets=(TH1F*)fOutput->FindObject("fhTriggeredTrklets");
 705   TH1F *fhSPDZTrklets=(TH1F*)fOutput->FindObject("fhSPDZTrklets");
 706   TH1F *fhSPD3DTrklets=(TH1F*)fOutput->FindObject("fhSPD3DTrklets");
 707   TH1F *fhTRKTrklets=(TH1F*)fOutput->FindObject("fhTRKTrklets");
 708   TH1F *fhTRKcTrklets=(TH1F*)fOutput->FindObject("fhTRKcTrklets");
 709   TH1F *fhTRKncTrklets=(TH1F*)fOutput->FindObject("fhTRKncTrklets");
 710   TH1F *fhSPDZZreco=(TH1F*)fOutput->FindObject("fhSPDZZreco");
 711   TH1F *fhSPD3DZreco=(TH1F*)fOutput->FindObject("fhSPD3DZreco");
 712
 713   TGraphAsymmErrors *fhSPDZEffTrklets=new TGraphAsymmErrors(fhSPDZTrklets,fhTriggeredTrklets,"w");
 714   fhSPDZEffTrklets->SetName("fhSPDZEffTrklets");
 715   fhSPDZEffTrklets->SetDrawOption("AP");
 716   TGraphAsymmErrors *fhSPD3DEffTrklets=new TGraphAsymmErrors(fhSPD3DTrklets,fhTriggeredTrklets,"w");
 717   fhSPD3DEffTrklets->SetName("fhSPD3DEffTrklets");
 718   TH1F * fhSPDOverallTrklets=(TH1F*)fhSPDZTrklets->Clone("fhSPDOverallTrklets");
 719   fhSPDOverallTrklets->Add(fhSPD3DTrklets);
 720   TGraphAsymmErrors *fhSPDOverallEffTrklets=new TGraphAsymmErrors(fhSPDOverallTrklets,fhTriggeredTrklets,"w");
 721   fhSPDOverallEffTrklets->SetName("fhSPDOverallEffTrklets");
 722   TGraphAsymmErrors *fhTRKEffTrklets=new TGraphAsymmErrors(fhTRKTrklets,fhTriggeredTrklets,"w");
 723   fhTRKEffTrklets->SetName("fhTRKEffTrklets");
 724   TGraphAsymmErrors *fhTRKcEffTrklets=new TGraphAsymmErrors(fhTRKcTrklets,fhTriggeredTrklets,"w");
 725   fhTRKcEffTrklets->SetName("fhTRKcEffTrklets");
 726   TGraphAsymmErrors *fhTRKncEffTrklets=new TGraphAsymmErrors(fhTRKncTrklets,fhTriggeredTrklets,"w");
 727   fhTRKncEffTrklets->SetName("fhTRKncEffTrklets");
 728   TH1F * fhSPDOverallZreco=(TH1F*)fhSPDZZreco->Clone("fhSPDOverallZreco");
 729   fhSPDOverallZreco->Add(fhSPD3DZreco);
 730   TGraphAsymmErrors *fhSPDEffZreco=new TGraphAsymmErrors(fhSPD3DZreco,fhSPDOverallZreco,"w");
 731   fhSPDEffZreco->SetName("fhSPDEffZreco");
 732
 733   TH1F *fhEff = new TH1F("hEff","hEff",6,0.5,6.5);
 734   Int_t count=1;
 735   if(fhSPDZTrklets->GetEntries()!=0 && fhTriggeredTrklets->GetEntries()!=0){
 736     fhEff->Fill(count,fhSPDZTrklets->GetEntries()/fhTriggeredTrklets->GetEntries());
 737     fhEff->SetBinError(count,fhEff->GetBinContent(count)*TMath::Sqrt(1/fhSPDZTrklets->GetEntries()+1/fhTriggeredTrklets->GetEntries()));
 738   }
 739   fhEff->GetXaxis()->SetBinLabel(count,"SPDZ");
 740
 741   count++;
 742   if(fhSPD3DTrklets->GetEntries()!=0 && fhTriggeredTrklets->GetEntries()!=0){
 743     fhEff->Fill(count,fhSPD3DTrklets->GetEntries()/fhTriggeredTrklets->GetEntries());
 744     fhEff->SetBinError(count,fhEff->GetBinContent(count)*TMath::Sqrt(1/fhSPD3DTrklets->GetEntries()+1/fhTriggeredTrklets->GetEntries()));
 745   }
 746   fhEff->GetXaxis()->SetBinLabel(count,"SPD3D");
 747
 748   count++;
 749   if(fhSPDOverallTrklets->GetEntries()!=0 && fhTriggeredTrklets->GetEntries()!=0){
 750     fhEff->Fill(count,fhSPDOverallTrklets->GetEntries()/fhTriggeredTrklets->GetEntries());
 751     fhEff->SetBinError(count,fhEff->GetBinContent(count)*TMath::Sqrt(1/fhSPDOverallTrklets->GetEntries()+1/fhTriggeredTrklets->GetEntries()));
 752   }
 753   fhEff->GetXaxis()->SetBinLabel(count,"SPD Overall");
 754
 755   count++;
 756   if(fhTRKTrklets->GetEntries()!=0 && fhTriggeredTrklets->GetEntries()!=0){
 757     fhEff->Fill(count,fhTRKTrklets->GetEntries()/fhTriggeredTrklets->GetEntries());
 758     fhEff->SetBinError(count,fhEff->GetBinContent(count)*TMath::Sqrt(1/fhTRKTrklets->GetEntries()+1/fhTriggeredTrklets->GetEntries()));
 759   }
 760   fhEff->GetXaxis()->SetBinLabel(count,"TRK");
 761
 762   count++;
 763   if(fhTRKcTrklets->GetEntries()!=0 && fhTriggeredTrklets->GetEntries()!=0){
 764     fhEff->Fill(count,fhTRKcTrklets->GetEntries()/fhTriggeredTrklets->GetEntries());
 765     fhEff->SetBinError(count,fhEff->GetBinContent(count)*TMath::Sqrt(1/fhTRKcTrklets->GetEntries()+1/fhTriggeredTrklets->GetEntries()));
 766   }
 767   fhEff->GetXaxis()->SetBinLabel(count,"TRKc");
 768
 769   count++;
 770   if(fhTRKncTrklets->GetEntries()!=0 && fhTriggeredTrklets->GetEntries()!=0){
 771     fhEff->Fill(count,fhTRKncTrklets->GetEntries()/fhTriggeredTrklets->GetEntries());
 772     fhEff->SetBinError(count,fhEff->GetBinContent(count)*TMath::Sqrt(1/fhTRKncTrklets->GetEntries()+1/fhTriggeredTrklets->GetEntries()));
 773   }
 774   fhEff->GetXaxis()->SetBinLabel(count,"TRKnc");
 775
 776   count++;
 777   fhEff->Print("all");
 778
 779   TFile* fileEff = new TFile("VtxEff.root","recreate");
 780   fhSPDZEffTrklets->Write();
 781   fhSPD3DEffTrklets->Write();
 782   fhSPDOverallEffTrklets->Write();
 783   fhTRKEffTrklets->Write();
 784   fhTRKcEffTrklets->Write();
 785   fhTRKncEffTrklets->Write();
 786   fhSPDEffZreco->Write();
 787   fhEff->Write();
 788   fileEff->Close();
 789   delete fileEff;
 790
 791   /////////////////////////////////////////
 792   */
 793
 794
 795   if (!fNtupleVertexESD){
 796     Printf("ERROR: fNtuple not available");
 797     return;
 798   }
 799
 800   fNtupleVertexESD = dynamic_cast<TNtuple*>(fOutput->FindObject("fNtupleVertexESD"));
 801
 802
 803   return;
 804 }
 805
 806 //_________________________________________________________________________
 807 AliESDVertex* AliAnalysisTaskVertexESD::ReconstructPrimaryVertexTPC(Bool_t constr) const {
 808   // On the fly reco of TPC vertex from ESD
 809   AliESDEvent* evt = (AliESDEvent*) fInputEvent;
 810   AliVertexerTracks vertexer(evt->GetMagneticField());
 811   if(evt->GetNumberOfTracks()<500) {
 812     vertexer.SetTPCMode(); // defaults
 813   } else {
 814     vertexer.SetTPCMode(0.1,1.0,5.0,10,1,3.,0.1,1.5,3.,30.,1,1);// PbPb
 815   }
 816   Float_t diamondcovxy[3]; evt->GetDiamondCovXY(diamondcovxy);
 817   Double_t pos[3]={evt->GetDiamondX(),evt->GetDiamondY(),0};
 818   Double_t cov[6]={diamondcovxy[0],diamondcovxy[1],diamondcovxy[2],0.,0.,10.*10.};
 819   AliESDVertex *initVertex = new AliESDVertex(pos,cov,1.,1);
 820   vertexer.SetVtxStart(initVertex);
 821   delete initVertex;
 822   if(!constr) vertexer.SetConstraintOff();
 823
 824   return vertexer.FindPrimaryVertex(evt);
 825 }
 826
 827 //_________________________________________________________________________
 828 AliESDVertex* AliAnalysisTaskVertexESD::ReconstructPrimaryVertexITSTPC(Bool_t constr,Int_t mode) const {
 829   // On the fly reco of ITS+TPC vertex from ESD
 830   // mode=0 use all tracks
 831   // mode=1 use odd-number tracks
 832   // mode=2 use even-number tracks
 833
 834   AliESDEvent* evt = (AliESDEvent*) fInputEvent;
 835   AliVertexerTracks vertexer(evt->GetMagneticField());
 836   if(evt->GetNumberOfTracks()<500) {
 837     vertexer.SetITSMode(); // defaults
 838     vertexer.SetMinClusters(4); // default is 5
 839   } else {
 840     vertexer.SetITSMode(0.1,0.1,0.5,5,1,3.,100.,1000.,3.,30.,1,1);// PbPb
 841   }
 842   //vertexer.SetITSpureSA();
 843   Float_t diamondcovxy[3]; evt->GetDiamondCovXY(diamondcovxy);
 844   Double_t pos[3]={evt->GetDiamondX(),evt->GetDiamondY(),0};
 845   Double_t cov[6]={diamondcovxy[0],diamondcovxy[1],diamondcovxy[2],0.,0.,10.*10.};
 846   AliESDVertex *initVertex = new AliESDVertex(pos,cov,1.,1);
 847   vertexer.SetVtxStart(initVertex);
 848   delete initVertex;
 849   if(!constr) vertexer.SetConstraintOff();
 850
 851   // use only ITS-TPC or only ITS-SA tracks
 852   if(fOnlyITSTPCTracks || fOnlyITSSATracks || mode>0) {
 853     Int_t iskip=0;
 854     Int_t *skip = new Int_t[evt->GetNumberOfTracks()];
 855     for(Int_t itr=0;itr<evt->GetNumberOfTracks(); itr++) {
 856       AliESDtrack* track = evt->GetTrack(itr);
 857       if(fOnlyITSTPCTracks && track->GetNcls(1)==0) { // skip ITSSA
 858         skip[iskip++]=itr;
 859         continue;
 860       }
 861       if(fOnlyITSSATracks && track->GetNcls(1)>0) { // skip ITSTPC
 862         skip[iskip++]=itr;
 863         continue;
 864       }
 865       if(mode==1 && itr%2==0) skip[iskip++]=itr;
 866       if(mode==2 && itr%2==1) skip[iskip++]=itr;
 867     }
 868     vertexer.SetSkipTracks(iskip,skip);
 869     delete [] skip; skip=NULL;
 870   }
 871
 872   return vertexer.FindPrimaryVertex(evt);
 873 }