コード例 #1
0
int main(int argc, char* argv[])
{
  TApplication theApp(srcName.Data(), &argc, argv);
//=============================================================================

  for (int i=0; i<argc; i++) cout << i << ", " << argv[i] << endl;
//=============================================================================

  if (argc<5) return -1;
  TString sPath = argv[1]; if (sPath.IsNull()) return -1;
  TString sFile = argv[2]; if (sFile.IsNull()) return -1;
  TString sJetR = argv[3]; if (sJetR.IsNull()) return -1;
  TString sSjeR = argv[4]; if (sSjeR.IsNull()) return -1;
//=============================================================================

  sPath.ReplaceAll("#", "/");
//=============================================================================

  double dJetR = -1.;
  if (sJetR=="JetR02") dJetR = 0.2;
  if (sJetR=="JetR03") dJetR = 0.3;
  if (sJetR=="JetR04") dJetR = 0.4;
  if (sJetR=="JetR05") dJetR = 0.5;

  if (dJetR<0.) return -1;
  cout << "Jet R = " << dJetR << endl;
//=============================================================================

  double dSjeR = -1.;
  if (sSjeR=="SjeR01") dSjeR = 0.1;
  if (sSjeR=="SjeR02") dSjeR = 0.2;
  if (sSjeR=="SjeR03") dSjeR = 0.3;
  if (sSjeR=="SjeR04") dSjeR = 0.4;

  if (dSjeR<0.) return -1;
  cout << "Sub-jet R = " << dSjeR << endl;
//=============================================================================

  const double dJetsPtMin  = 0.001;
  const double dCutEtaMax  = 1.6;
  const double dJetEtaMax  = 1.;
  const double dJetAreaRef = TMath::Pi() * dJetR * dJetR;

  fastjet::GhostedAreaSpec areaSpc(dCutEtaMax);
  fastjet::JetDefinition   jetsDef(fastjet::antikt_algorithm, dJetR, fastjet::BIpt_scheme, fastjet::Best);

//fastjet::AreaDefinition  areaDef(fastjet::active_area,areaSpc);
  fastjet::AreaDefinition  areaDef(fastjet::active_area_explicit_ghosts,areaSpc);

//fastjet::JetDefinition   bkgsDef(fastjet::kt_algorithm, 0.2, fastjet::BIpt_scheme, fastjet::Best);
//fastjet::AreaDefinition  aBkgDef(fastjet::active_area_explicit_ghosts, areaSpc);

  fastjet::Selector selectJet = fastjet::SelectorAbsEtaMax(dJetEtaMax);
//fastjet::Selector selectRho = fastjet::SelectorAbsEtaMax(dCutEtaMax-0.2);
//fastjet::Selector selecHard = fastjet::SelectorNHardest(2);
//fastjet::Selector selectBkg = selectRho * (!(selecHard));
//fastjet::JetMedianBackgroundEstimator bkgsEstimator(selectBkg, bkgsDef, aBkgDef);
//fastjet::Subtractor                   bkgSubtractor(&bkgsEstimator);

  fastjet::JetDefinition subjDef(fastjet::antikt_algorithm, dSjeR, fastjet::BIpt_scheme, fastjet::Best);
//=============================================================================

  std::vector<fastjet::PseudoJet> fjInput;
//=============================================================================

  TList *list = new TList();
  TH1D *hPtHat = new TH1D("hPtHat", "", 1000, 0., 1000.);

  TH1D *hJet = new TH1D("hJet", "", 1000, 0., 1000.); hJet->Sumw2(); list->Add(hJet);
  TH2D *hJetNsj = new TH2D("hJetNsj", "", 1000, 0., 1000., 101, -0.5, 100.5); hJetNsj->Sumw2(); list->Add(hJetNsj);

  TH2D *hJetIsj = new TH2D("hJetIsj", "", 1000, 0., 1000., 1000, 0., 1000.); hJetIsj->Sumw2(); list->Add(hJetIsj);
  TH2D *hJet1sj = new TH2D("hJet1sj", "", 1000, 0., 1000., 1000, 0., 1000.); hJet1sj->Sumw2(); list->Add(hJet1sj);
  TH2D *hJet2sj = new TH2D("hJet2sj", "", 1000, 0., 1000., 1000, 0., 1000.); hJet2sj->Sumw2(); list->Add(hJet2sj);
  TH2D *hJetDsj = new TH2D("hJetDsj", "", 1000, 0., 1000., 1000, 0., 1000.); hJetDsj->Sumw2(); list->Add(hJetDsj);

  TH2D *hJetIsz = new TH2D("hJetIsz", "", 1000, 0., 1000., 120, 0., 1.2); hJetIsz->Sumw2(); list->Add(hJetIsz);
  TH2D *hJet1sz = new TH2D("hJet1sz", "", 1000, 0., 1000., 120, 0., 1.2); hJet1sz->Sumw2(); list->Add(hJet1sz);
  TH2D *hJet2sz = new TH2D("hJet2sz", "", 1000, 0., 1000., 120, 0., 1.2); hJet2sz->Sumw2(); list->Add(hJet2sz);
  TH2D *hJetDsz = new TH2D("hJetDsz", "", 1000, 0., 1000., 120, 0., 1.2); hJetDsz->Sumw2(); list->Add(hJetDsz);
//=============================================================================

  AliRunLoader *rl = AliRunLoader::Open(Form("%s/galice.root",sPath.Data())); if (!rl) return -1;

  if (rl->LoadHeader()) return -1;
  if (rl->LoadKinematics("READ")) return -1;
//=============================================================================

  for (Int_t iEvent=0; iEvent<rl->GetNumberOfEvents(); iEvent++) {
    fjInput.resize(0);
    if (rl->GetEvent(iEvent)) continue;
//=============================================================================

    AliStack  *pStack  = rl->Stack();     if (!pStack)  continue;
    AliHeader *pHeader = rl->GetHeader(); if (!pHeader) continue;
//=============================================================================

    AliGenPythiaEventHeader *pHeadPy = (AliGenPythiaEventHeader*)pHeader->GenEventHeader();

    if (!pHeadPy) continue;
    hPtHat->Fill(pHeadPy->GetPtHard());
//=============================================================================

    for (Int_t i=0; i<pStack->GetNtrack(); i++) if (pStack->IsPhysicalPrimary(i)) {
      TParticle *pTrk = pStack->Particle(i); if (!pTrk) continue;
      if (TMath::Abs(pTrk->Eta())>dCutEtaMax) { pTrk = 0; continue; }
//    TParticlePDG *pPDG = pTrk->GetPDG(); if (!pPDG) { pTrk = 0; continue; }

      fjInput.push_back(fastjet::PseudoJet(pTrk->Px(), pTrk->Py(), pTrk->Pz(), pTrk->P()));

//    pPDG = 0;
      pTrk = 0;
    }
//=============================================================================

    fastjet::ClusterSequenceArea clustSeq(fjInput, jetsDef, areaDef);
    std::vector<fastjet::PseudoJet> includJets = clustSeq.inclusive_jets(dJetsPtMin);
//  std::vector<fastjet::PseudoJet> subtedJets = bkgSubtractor(includJets);
    std::vector<fastjet::PseudoJet> selectJets = selectJet(includJets);
//  std::vector<fastjet::PseudoJet> sortedJets = fastjet::sorted_by_pt(selectJets);

    for (int j=0; j<selectJets.size(); j++) {
      double dJet = selectJets[j].pt();

      hJet->Fill(dJet);
//=============================================================================

      fastjet::Filter trimmer(subjDef, fastjet::SelectorPtFractionMin(0.));
      fastjet::PseudoJet trimmdJet = trimmer(selectJets[j]);
      std::vector<fastjet::PseudoJet> trimmdSj = trimmdJet.pieces();

      double nIsj = 0.;
      double d1sj = -1.; int k1sj = -1;
      double d2sj = -1.; int k2sj = -1;
      for (int i=0; i<trimmdSj.size(); i++) {
        double dIsj = trimmdSj[i].pt(); if (dIsj<0.001) continue;

        hJetIsj->Fill(dJet, dIsj);
        hJetIsz->Fill(dJet, dIsj/dJet);

        if (dIsj>d1sj) {
          d2sj = d1sj; k2sj = k1sj;
          d1sj = dIsj; k1sj = i;
        } else if (dIsj>d2sj) {
          d2sj = dIsj; k2sj = i;
        } nIsj += 1.;
      }

      hJetNsj->Fill(dJet, nIsj);
      if (d1sj>0.) { hJet1sj->Fill(dJet, d1sj); hJet1sz->Fill(dJet, d1sj/dJet); }
      if (d2sj>0.) { hJet2sj->Fill(dJet, d2sj); hJet2sz->Fill(dJet, d2sj/dJet); }

      if ((d1sj>0.) && (d2sj>0.)) {
        double dsj = d1sj - d2sj;
        double dsz = dsj / dJet;

        hJetDsj->Fill(dJet, dsj);
        hJetDsz->Fill(dJet, dsz);
      }
    }
//=============================================================================

    pStack  = 0;
    pHeadPy = 0;
    pHeader = 0;
  }
//=============================================================================

  rl->UnloadgAlice();
  rl->UnloadHeader();
  rl->UnloadKinematics();
  rl->RemoveEventFolder();
//=============================================================================

  TFile *file = TFile::Open(Form("%s/pyxsec_hists.root",sPath.Data()), "READ");
  TList *lXsc = (TList*)file->Get("cFilterList");
  file->Close();

  TH1D     *hWeightSum = (TH1D*)lXsc->FindObject("h1Trials");   hWeightSum->SetName("hWeightSum");
  TProfile *hSigmaGen  = (TProfile*)lXsc->FindObject("h1Xsec"); hSigmaGen->SetName("hSigmaGen");
//=============================================================================

  file = TFile::Open(Form("%s.root",sFile.Data()), "NEW");
  hPtHat->Write();
  hWeightSum->Write();
  hSigmaGen->Write();
  list->Write();
  file->Close();
//=============================================================================

  cout << "DONE" << endl;
//=============================================================================

  return 0;
}
コード例 #2
0
ファイル: CheckESD.C プロジェクト: noferini/ALICE
// analisi
Bool_t CheckSingle(const char* esdFileName,Bool_t kGRID){
  //inizializzo a zero ncluster (di tree T)
  //for (int ifc=0;ifc<10000;ifc++) ncluster[ifc]=0;
  
  // check the content of the ESD
  
  AliPIDResponse *pidr = new AliPIDResponse();
  
  // open the ESD file
  TFile* esdFile = TFile::Open(esdFileName);
  if (!esdFile || !esdFile->IsOpen()){
    Error("CheckESD", "opening ESD file %s failed", esdFileName);
    return kFALSE;
  }
  
  TString mctrkref(esdFileName);
  mctrkref.ReplaceAll("AliESDs.root","TrackRefs.root");
  TString fgal(esdFileName);
  fgal.ReplaceAll("AliESDs.root","galice.root");
  
  if(kGRID){
    fgal.Insert(0,"alien://");
    mctrkref.Insert(0,"alien://");
  }
  
  TTree *trkref;
  
  printf("ESD = %s\n",esdFileName);
  
  TFile *ftrkref; 
  if(isMC) ftrkref = TFile::Open(mctrkref.Data());
  
  AliHeader *h = new AliHeader();
  
  TFile *fgalice;
  if(isMC) fgalice = TFile::Open(fgal.Data());
  TTree *tgalice;
  if(isMC){
    tgalice = (TTree *) fgalice->Get("TE");
    tgalice->SetBranchAddress("Header",&h);
  }
  
  AliRunLoader* runLoader = NULL;
  
  AliRun *gAlice;
  if(isMC) runLoader = AliRunLoader::Open(fgal.Data());
  if(runLoader){
    runLoader->LoadgAlice();
    gAlice = runLoader->GetAliRun();
    if (!gAlice) {
      Error("CheckESD", "no galice object found");
      return kFALSE;
    }
    runLoader->LoadKinematics();
    runLoader->LoadHeader();
  }
  
  AliESDEvent * esd = new AliESDEvent;
  //  printf("esd object = %x\n",esd);
  TTree* tree = (TTree*) esdFile->Get("esdTree");
  if (!tree){
    Error("CheckESD", "no ESD tree found");
    return kFALSE;
  }
  esd->ReadFromTree(tree); // crea link tra esd e tree
  
  TClonesArray* tofcl;  // array dinamico
  TClonesArray* tofhit;
  TClonesArray* tofmatch;
  
  Int_t nev = tree->GetEntries(); //ogni entries evento
  Float_t mag;
  
  printf("nev = %i\n",nev);
  
  //azzero il contatore delle tracce del TTree T
  //ntracks=0;
  AliStack* stack=NULL;
  
  Int_t trkassociation[1000000];
  
  for(Int_t ie=0;ie < nev;ie++){
    if(runLoader){
      runLoader->GetEvent(ie);
      
      // select simulated primary particles, V0s and cascades
      stack = runLoader->Stack();
    }
    
    if(isMC) trkref = (TTree *) ftrkref->Get(Form("Event%i/TreeTR",ie));
    tree->GetEvent(ie);
    if(isMC) tgalice->GetEvent(ie);
    
    if(isMC) interactiontime = h->GenEventHeader()->InteractionTime()*1E+12;
    
    mag = esd->GetMagneticField();
    
    AliTOFHeader *tofh = esd->GetTOFHeader();
    ntofcl = tofh->GetNumberOfTOFclusters();
    
    esd->ConnectTracks(); // Deve essere sempre chiamato dopo aver letto l'evento (non troverebbe l'ESDevent). Scrivo in tutte le tracce l origine dell evento così poi da arrivare ovunque(tipo al cluster e al tempo quindi).
    
    
    //Riempio variabile del tree "T"
    //nevento=ie;
    
    if(! esd->GetVertex()){
      esd->ResetStdContent();
      continue;// una volta fatto il connect manda un flag ; siccome qua c'era un continue(non si arriva in fondo al ciclo) bisogna resettarlo altrimenti lo trova già attivo.
    }
    
    tofcl = esd->GetESDTOFClusters(); // AliESDTOFCluster *cltof = tofcl->At(i);
    if(tofcl->GetEntries() == 0){
      esd->ResetStdContent();
      continue;
    }
    tofhit = esd->GetESDTOFHits(); // AliESDTOFHit *hittof = tofhit->At(i);
    tofmatch = esd->GetESDTOFMatches(); // AliESDTOFHit *mathctof = tofmatch->At(i);
    
    // loop over tracks
    
    pidr->SetTOFResponse(esd,AliPIDResponse::kTOF_T0); //per recuperare lo start time ("esd", "tipo start time"), tipo cioè o il TOF stesso o il T0 o il best, ovvero la combinazione dei 2
    
    Int_t ntrk = esd->GetNumberOfTracks();
    
    //printf("%i) TPC tracks = %i -- TOF cluster = %i - TOF hit = %i -- matchable info = %i\n",ie,ntrk,tofcl->GetEntries(),tofhit->GetEntries(),tofmatch->GetEntries());
    
    Double_t time[AliPID::kSPECIESC];
    
    
    if(isMC && stack){// create association trackref
      printf("nMC track = %i\n",stack->GetNtrack());
      for(Int_t ist=0;ist < stack->GetNtrack();ist++){
	trkassociation[ist]=-1;
      }
      for(Int_t iref=0;iref < trkref->GetEntries();iref++){
	trkref->GetEvent(iref);
	Int_t trkreference = trkref->GetLeaf("TrackReferences.fTrack")->GetValue();
	if(trkreference > -1 && trkreference < 1000000){
	  trkassociation[trkreference] = iref;
	}
      }
    }
    
    for (Int_t iTrack = 0; iTrack < ntrk; iTrack++){
      AliESDtrack* track = esd->GetTrack(iTrack);
      
      // select tracks of selected particles
      if ((track->GetStatus() & AliESDtrack::kITSrefit) == 0) continue;//almeno un hit nell ITS
      if (track->GetConstrainedChi2() > 4) continue; //se brutto X^2
      if ((track->GetStatus() & AliESDtrack::kTOFout) == 0) continue; //se traccia matchata con tof
      if(track->GetNumberOfTPCClusters() < 70) continue;
      Float_t p =track->P();
      
      itrig = 0;
      timetrig = 0;
      
      if(p > 0.9 && p < 1.1){
 	track->GetIntegratedTimes(time);
	
	itrig = iTrack;
	timetrig = track->GetTOFsignal() - time[2];
	iTrack = ntrk;
      }
    }
    
    printf("real loop, ntrk = %i\n",ntrk);
  
    for (Int_t iTrack = 0; iTrack < ntrk; iTrack++){
      AliESDtrack* track = esd->GetTrack(iTrack);
      
      // select tracks of selected particles
      if ((track->GetStatus() & AliESDtrack::kITSrefit) == 0) continue;//almeno un hit nell ITS
      if (track->GetConstrainedChi2() > 4) continue; //se brutto X^2
      
      //if ((track->GetStatus() & AliESDtrack::kTOFout) == 0) continue; //se traccia matchata con tof
      if(track->GetNumberOfTPCClusters() < 70) continue;

      TOFout = (track->GetStatus() & AliESDtrack::kTOFout) > 0;

      track->GetIntegratedTimes(time);
      
      Float_t dx = track->GetTOFsignalDx(); //leggo i residui tra traccia e canale tof acceso
      Float_t dz = track->GetTOFsignalDz();
      
      mism = 0;
      
      dedx = track->GetTPCsignal();
      
      Int_t label = TMath::Abs(track->GetLabel());
      if(stack){
	TParticle *part=stack->Particle(label);
	pdg = part->GetPdgCode();
      }
      
      Int_t TOFlabel[3];
      track->GetTOFLabel(TOFlabel);
      
      //  printf("%i %i %i %i\n",label,TOFlabel[0],TOFlabel[1],TOFlabel[2]);
      
      ChannelTOF[0] = track->GetTOFCalChannel();
      //      printf("geant time = %f\n",gtime);
      //getchar();
      // if(TMath::Abs(dx) > 1.25 || TMath::Abs(dz) > 1.75) continue; // is inside the pad
      
      //riempio il numro di cludter e impulso trasverso per traccia del TTree T
      ncluster=track->GetNTOFclusters();
      impulso_trasv=track->Pt();
      impulso=track->P();
      
      StartTime = pidr->GetTOFResponse().GetStartTime(track->P());
      StartTimeRes = pidr->GetTOFResponse().GetStartTimeRes(track->P());
      
      if(track->Pt() > 0.9 && track->Pt() < 1.5){  //impulso non troppo alto per separazione tra particelle
	Float_t dt = track->GetTOFsignal() - time[2] - pidr->GetTOFResponse().GetStartTime(track->P());//tempo TOF(è lo stesso di Gettime, solo che lo prendo dale tracce)(già calibrato) -ip del PI (posizione 0 e, posizione 1 mu, pos 2 PI, pos 3 K,pos 4 p) -start time
	Float_t dtKa = track->GetTOFsignal() - time[3] - pidr->GetTOFResponse().GetStartTime(track->P());
	Float_t dtPr = track->GetTOFsignal() - time[4] - pidr->GetTOFResponse().GetStartTime(track->P());
	hdt->Fill(dt);
	hdtKa->Fill(dtKa);
	hdtPr->Fill(dtPr);
      }
      
      charge = track->Charge();
      phi = track->Phi();
      eta = track->Eta();

      GetPositionAtTOF(track,mag,coord);
      phiExt = TMath::ATan2(coord[1],coord[0]);
      etaExt =  -TMath::Log(TMath::Tan(0.5*TMath::ATan2(sqrt(coord[0]*coord[0]+coord[1]*coord[1]),coord[2])));

      for (int i=0;i<(track->GetNTOFclusters());i++){
	int idummy=track->GetTOFclusterArray()[i];
        
	AliESDTOFCluster *cl = (AliESDTOFCluster *) tofcl->At(idummy);
        
	tempo[i]=cl->GetTime();
	tot[i]=cl->GetTOT();
        
	ChannelTOF[i]=cl->GetTOFchannel();
		
	if(i==0){
	  GetResolutionAtTOF(track,mag,ChannelTOF[i],res);
	}
	
	for(int im=cl->GetNMatchableTracks();im--;){ //o così o da n-1 a 0 //for(int im=cl->GetNMatchableTracks();im>0;im--) non andava bene perchè non prendeva mai lo 0  
	  
	  //	    if(track->GetNTOFclusters()==2) printf("-- %i) %f %f\n",im,cl->GetLength(im),cl->GetIntegratedTime(2,im));
	  
	  if(cl->GetTrackIndex(im) == track->GetID()){
	    exp_time_el[i] = cl->GetIntegratedTime(0,im); // pi = 2
	    exp_time_mu[i] = cl->GetIntegratedTime(1,im); // pi = 2
	    exp_time_pi[i] = cl->GetIntegratedTime(2,im); // pi = 2
	    exp_time_ka[i] = cl->GetIntegratedTime(3,im); // pi = 2
	    exp_time_pr[i] = cl->GetIntegratedTime(4,im); // pi = 2
	    L[i] = cl->GetLength(im);
	    //		  if(track->GetNTOFclusters()==2)printf("%i) %f %f\n",i,L[i],exp_time_pi[i]);
	    DeltaX[i]=cl->GetDx(im); // mettendolo dentro questo if dovrei prendere i residui di una stessa traccia
	    DeltaZ[i]=cl->GetDz(im);
	  }
	}
      }
         
      //ReMatch();
      
      Int_t jref=0;
      if(isMC){
	if(TOFlabel[0] > -1 && TOFlabel[0] < 1000000){
	  trkref->GetEvent(trkassociation[TOFlabel[0]]);
	  if(TOFlabel[0] == trkref->GetLeaf("TrackReferences.fTrack")->GetValue()){
	    //  printf("trk -> %i (%i)\n",trkref->GetLeaf("TrackReferences.fTrack")->GetValue(),trkref->GetLeaf("TrackReferences.fTrack")->GetValue(jref));	
	    while(jref > -1 && trkref->GetLeaf("TrackReferences.fTrack")->GetValue(jref) != 0){
	      //printf("det = %i\n",trkref->GetLeaf("TrackReferences.fDetectorId")->GetValue(jref));
	      if(trkref->GetLeaf("TrackReferences.fDetectorId")->GetValue(jref) == 4){
		gtime=trkref->GetLeaf("TrackReferences.fTime")->GetValue(jref)*1E+12;
		xgl = trkref->GetLeaf("TrackReferences.fX")->GetValue(jref);
		ygl = trkref->GetLeaf("TrackReferences.fY")->GetValue(jref);
		zgl = trkref->GetLeaf("TrackReferences.fZ")->GetValue(jref);
		MakeTrueRes();
		jref =  100;
	      }
	      jref++;
	    }
	  }
	}
      }
      
      
      if(TMath::Abs(label) != TOFlabel[0] && stack){
	mism=2;
	
	while(TOFlabel[0] != -1 && TOFlabel[0] != label){
	  TOFlabel[0] = stack->Particle(TOFlabel[0])->GetMother(0);
	}
	
	if(label == TOFlabel[0])
	  mism=1;	
	
      }
      
      //AddDelay();
      T->Fill(); //cout<<"riempio il tree  "<<endl; //Riempio tree "T"
    
      
      
      //incremento il contatore delle tracce del TTree T matchate e che superano i tagli
      //ntracks++;
      
    }//end of for(tracks)
      
      
    
    esd->ResetStdContent();
    
    
    
  } //end of for(events)

  if(runLoader){
    runLoader->UnloadHeader();
    runLoader->UnloadKinematics();
    delete runLoader;
  }
  
  esdFile->Close();
  if(isMC) ftrkref->Close();
  if(isMC) fgalice->Close();
}
コード例 #3
0
void AliITSVertexerTracksTest2(Int_t evFirst=0,Int_t evLast=0,
			      const Char_t *galiceName="galice.root",
			      const Char_t *trksName="AliITStracksV2.root",
			      const Char_t *vtxName="AliITSVertices.root") {
  /*******************************************************************
   *                                                                 *
   * Test macro for vertexing in pp using tracks.                    *
   * Input file must contain trees with AliITStrackV2 objects.       *
   * Output file can be the same file with the tracks                *
   * or another file.                                                *
   * If the file galice.root is available, B is taken from there,    *
   * otherwise is can be set here "by hand".                         *
   *                                                                 *
   * Origin: A.Dainese, Padova  [email protected]            *
   *******************************************************************/     

  // Look for field value in galice.root
  Double_t field = 0.4;
  Int_t kDebug = 0;
  TFile *galice = 0;
  if(!gSystem->AccessPathName(galiceName,kFileExists)) {
    galice = new TFile(galiceName);
    gAlice = (AliRun*)galice->Get("gAlice");
    AliMagF *fiel = TGeoGlobalMagField::Instance()->GetField();
    field=(Double_t)fiel->SolenoidField()/10.;
    AliKalmanTrack::SetConvConst(100/0.299792458/field);
    printf(" B = %3.1f read from gAlice and set\n",field);
  } else {
    printf(" File galice.root not found: default 0.4 T being used!\n");
  }

  // Open input and output files
  TFile *inFile = TFile::Open(trksName);
  TFile *outFile = TFile::Open(vtxName,"recreate");

  // Create vertexer
  AliITSVertexerTracks *vertexer = 
    new AliITSVertexerTracks(inFile,outFile,field,0.,0.);
  vertexer->SetDebug(0);
  vertexer->SetUseThrustFrame(0);
  vertexer->PrintStatus();

  AliITSVertex *vert = 0;
  // Find vertices

  for(Int_t i=evFirst; i<=evLast; i++){
    if(i%100==0)cout<<"processing event "<<i<<endl;
    gAlice->GetEvent(i);
    // The true Z coord. is fetched for comparison
    AliHeader *header = gAlice->GetHeader();
    AliGenEventHeader* genEventHeader = header->GenEventHeader();
    TArrayF primaryVertex(3);
    genEventHeader->PrimaryVertex(primaryVertex);
    vert = vertexer->FindVertexForCurrentEvent(i);
    if(kDebug>0){
      // Prints the results
      cout <<"========================================================\n";
      cout << "Event number: "<<i<<")  Z Vertex:"<<endl;
      if(vert){
	cout<<"FOUND: "<<vert->GetZ()<<"; "<<vert->GetZRes()<<endl;
	cout <<" True Z position "<<primaryVertex[2]<<endl;
	cout<<", diff= "<<(primaryVertex[2]-vert->GetZ())*10000.<<endl;
      }
      else {
	cout<<"NOT FOUND "<<endl;
      }
    }
    if(vert){
      Double_t pos[3];
      for(Int_t kk=0;kk<3;kk++)pos[kk]=(Double_t)primaryVertex[kk];
      vert->SetTruePos(pos);
      vertexer->WriteCurrentVertex();
    }
  }

  delete vertexer;



  inFile->Close();
  outFile->Close();
  delete inFile;
  delete outFile;
  galice->Close();
  delete galice;
  return;
}