[u/mrichter/AliRoot.git] / ITS / UPGRADE / macros / AliTPCUComparison.C

/****************************************************************************
 *           Legacy comparison macro, adapted to the upgraded ITS.          *
 *                                                                          *
 *               Creates list of "trackable" tracks,                        *
 *             calculates efficiency, resolutions etc.                      *
 *     There is a possibility to run this macro over several events.        *
 *                                                                          *
 *           Origin: I.Belikov, IPHC, Iouri.Belikov@iphc.cnrs.fr            *
 * with several nice improvements by: M.Ivanov, GSI, m.ivanov@gsi.de        *
 ****************************************************************************/

#if !defined(__CINT__) || defined(__MAKECINT__)
  #include <TMath.h>
  #include <TError.h>
  #include <Riostream.h>
  #include <TH1F.h>
  #include <TH2F.h>
  #include <TTree.h>
  #include <TParticle.h>
  #include <TCanvas.h>
  #include <TLine.h>
  #include <TText.h>
  #include <TBenchmark.h>
  #include <TStyle.h>
  #include <TFile.h>
  #include <TROOT.h>
  #include <TGeoGlobalMagField.h>

  #include "AliStack.h"
  #include "AliHeader.h"
  #include "AliTrackReference.h"
  #include "AliRunLoader.h"
  #include "AliRun.h"
  #include "AliMagF.h"
  #include "AliESDEvent.h"
  #include "AliESDtrack.h"

  #include "Base/AliSimDigits.h"
  #include "Base/AliTPCParamSR.h"
  #include "Base/AliTPCLoader.h"
  #include "Base/AliTPCcalibDB.h"
  #include "Sim/AliTPC.h"
  #include "Rec/AliTPCClustersRow.h"

  #include "AliCDBManager.h"
#endif

Int_t GoodTracksTPC(const Char_t *dir=".");

extern TBenchmark *gBenchmark;
extern TROOT *gROOT;

static Int_t allgood=0;
static Int_t allselected=0;
static Int_t allfound=0;

Int_t AliTPCUComparison
(Float_t ptcutl=0., Float_t ptcuth=2., const Char_t *dir=".") {
   gBenchmark->Start("AliTPCUComparison");

   ::Info("AliTPCUComparison.C","Doing comparison...");


   TH1F *hp=(TH1F*)gROOT->FindObject("hp");
   if (!hp) hp=new TH1F("hp","PHI resolution",50,-20.,20.); 
   hp->SetFillColor(4);

   TH1F *hl=(TH1F*)gROOT->FindObject("hl");
   if (!hl) hl=new TH1F("hl","LAMBDA resolution",50,-20,20);
   hl->SetFillColor(4);

   TH1F *hpt=(TH1F*)gROOT->FindObject("hpt");
   if (!hpt) hpt=new TH1F("hpt","Relative Pt resolution",30,-10.,10.); 
   hpt->SetFillColor(2);
 
   TH1F *hmpt=(TH1F*)gROOT->FindObject("hmpt");
   if (!hmpt) 
      hmpt=new TH1F("hmpt","Relative Pt resolution (pt>4GeV/c)",30,-60,60); 
   hmpt->SetFillColor(6);


   Int_t nb=100;
   TH1F *hgood=(TH1F*)gROOT->FindObject("hgood");
   if (!hgood) hgood=new TH1F("hgood","Good tracks",nb,ptcutl,ptcuth);
    
   TH1F *hfound=(TH1F*)gROOT->FindObject("hfound");
   if (!hfound) hfound=new TH1F("hfound","Found tracks",nb,ptcutl,ptcuth);

   TH1F *hfake=(TH1F*)gROOT->FindObject("hfake");
   if (!hfake) hfake=new TH1F("hfake","Fake tracks",nb,ptcutl,ptcuth);

   TH1F *hg=(TH1F*)gROOT->FindObject("hg");
   if (!hg) hg=new TH1F("hg","Efficiency for good tracks",nb,ptcutl,ptcuth);
   hg->SetLineColor(4); hg->SetLineWidth(2);

   TH1F *hf=(TH1F*)gROOT->FindObject("hf");
   if (!hf) hf=new TH1F("hf","Efficiency for fake tracks",nb,ptcutl,ptcuth);
   hf->SetFillColor(1); hf->SetFillStyle(3013); hf->SetLineWidth(2);


   TH1F *he=(TH1F*)gROOT->FindObject("he");
   if (!he) 
      he =new TH1F("he","dE/dX for pions with 0.4<p<0.5 GeV/c",50,0.,100.);

   TH2F *hep=(TH2F*)gROOT->FindObject("hep");
   if (!hep) hep=new TH2F("hep","dE/dX vs momentum",50,0.,2.,50,0.,400.);
   hep->SetMarkerStyle(8);
   hep->SetMarkerSize(0.4);


   Char_t fname[100];
   sprintf(fname,"%s/GoodTracksTPC.root",dir);

   TFile *refFile=TFile::Open(fname,"old");
   if (!refFile || !refFile->IsOpen()) {
     ::Info("AliTPCUComparison.C","Marking good tracks (will take a while)...");
     if (GoodTracksTPC(dir)) {
        ::Error("AliTPCUComparison.C","Can't generate the reference file !");
        return 1;
     }
   }
   refFile=TFile::Open(fname,"old");
   if (!refFile || !refFile->IsOpen()) {
     ::Error("AliTPCUComparison.C","Can't open the reference file !");
     return 2;
   }   
  
   TTree *tpcTree=(TTree*)refFile->Get("tpcTree");
   if (!tpcTree) {
     ::Error("AliTPCUComparison.C","Can't get the reference tree !");
     return 3;
   }
   TBranch *branch=tpcTree->GetBranch("TPC");
   if (!branch) {
     ::Error("AliTPCUComparison.C","Can't get the TPC branch !");
     return 4;
   }
   TClonesArray dummy("AliTrackReference",1000), *refs=&dummy;
   branch->SetAddress(&refs);


   sprintf(fname,"%s/AliESDs.root",dir);
   TFile *ef=TFile::Open(fname);
   if ((!ef)||(!ef->IsOpen())) {
      sprintf(fname,"%s/AliESDtpc.root",dir);
      ef=TFile::Open(fname);
      if ((!ef)||(!ef->IsOpen())) {
         ::Error("AliTPCUComparison.C","Can't open AliESDtpc.root !");
         return 5;
      }
   }
   AliESDEvent* event = new AliESDEvent();
   TTree* esdTree = (TTree*) ef->Get("esdTree");
   if (!esdTree) {
      ::Error("AliTPCUComparison.C", "no ESD tree found");
      return 6;
   }
   event->ReadFromTree(esdTree);


   //******* Loop over events *********
   Int_t e=0;
   while (esdTree->GetEvent(e)) {
      cout<<endl<<endl<<"********* Processing event number: "<<e<<"*******\n";

      Int_t nentr=event->GetNumberOfTracks();
      allfound+=nentr;

      if (tpcTree->GetEvent(e++)==0) {
	 cerr<<"No reconstructable tracks !\n";
         continue;
      }

      Int_t ngood=refs->GetEntriesFast(); 
      allgood+=ngood;

      const Int_t MAX=15000;
    //MI change
      Int_t track_notfound[MAX], itrack_notfound=0;
      Int_t track_fake[MAX], itrack_fake=0;
      Int_t track_multifound[MAX],track_multifound_n[MAX],itrack_multifound=0;

      Int_t i;
      for (Int_t k=0; k<ngood; k++) {
	AliTrackReference *ref=(AliTrackReference*)refs->UncheckedAt(k); 
        Int_t lab=ref->Label(), tlab=-1;
        Float_t ptg=TMath::Sqrt(ref->Px()*ref->Px() + ref->Py()*ref->Py());

        if (ptg<1e-33) continue; // for those not crossing 0 pad row
  
        if (ptg<ptcutl) continue;
        if (ptg>ptcuth) continue;

        allselected++;

        hgood->Fill(ptg);

        AliESDtrack *track=0;
        for (i=0; i<nentr; i++) {
          track=event->GetTrack(i);
          tlab=track->GetTPCLabel();
          if (lab==TMath::Abs(tlab)) break;
        }
        if (i==nentr) {
	   track_notfound[itrack_notfound++]=lab;
           continue;
        }
      
        //MI change  - addition
        Int_t micount=0;
        Int_t mi;
        AliESDtrack * mitrack;
        for (mi=0; mi<nentr; mi++) {
	  mitrack=event->GetTrack(mi);          
	  if (lab==TMath::Abs(mitrack->GetTPCLabel())) micount++;
        }
        if (micount>1) {
	  track_multifound[itrack_multifound]=lab;
	  track_multifound_n[itrack_multifound]=micount;
	  itrack_multifound++;
        }
        if ((track->GetStatus()&AliESDtrack::kTPCrefit)==0) continue;
        if (lab==tlab) hfound->Fill(ptg);
        else { 
	  track_fake[itrack_fake++]=lab;
	  hfake->Fill(ptg); 
        }
      
        Double_t pxpypz[3]; track->GetInnerPxPyPz(pxpypz);
        Float_t phi=TMath::ATan2(pxpypz[1],pxpypz[0]);
        if (phi<-TMath::Pi()) phi+=2*TMath::Pi();
        if (phi>=TMath::Pi()) phi-=2*TMath::Pi();
        Double_t pt=TMath::Sqrt(pxpypz[0]*pxpypz[0]+pxpypz[1]*pxpypz[1]);
        Float_t lam=TMath::ATan2(pxpypz[2],pt); 
        Float_t pt_1=1/pt;

        Int_t pdg=(Int_t)ref->GetLength();  //this is particle's PDG !

        if (TMath::Abs(pdg)==11 && ptg>4.) {//high momentum electrons
           hmpt->Fill((pt_1 - 1/ptg)/(1/ptg)*100.);
        } else {
           Float_t phig=TMath::ATan2(ref->Py(),ref->Px());
           hp->Fill((phi - phig)*1000.);

           Float_t lamg=TMath::ATan2(ref->Pz(),ptg);
           hl->Fill((lam - lamg)*1000.);

           hpt->Fill((pt_1 - 1/ptg)/(1/ptg)*100.);
        }

        Float_t mom=pt/TMath::Cos(lam);
        Float_t dedx=track->GetTPCsignal();
        hep->Fill(mom,dedx,1.);
        if (TMath::Abs(pdg)==211) //pions
	   if (mom>0.4 && mom<0.5) {
              he->Fill(dedx,1.);
           }
      }

      cout<<"\nList of Not found tracks :\n";
      for ( i = 0; i< itrack_notfound; i++){
        cout<<track_notfound[i]<<"\t";
        if ((i%5)==4) cout<<"\n";
      }
      cout<<"\nList of fake  tracks :\n";
      for ( i = 0; i< itrack_fake; i++){
        cout<<track_fake[i]<<"\t";
        if ((i%5)==4) cout<<"\n";
      }
      cout<<"\nList of multiple found tracks :\n";
      for ( i=0; i<itrack_multifound; i++) {
          cout<<"id.   "<<track_multifound[i]
              <<"     found - "<<track_multifound_n[i]<<"times\n";
      }

      cout<<"Number of found tracks ="<<nentr<<endl;
      cout<<"Number of \"good\" tracks ="<<ngood<<endl;

      refs->Clear();
  }// ***** End of the loop over events

   delete event;
   delete esdTree;
   ef->Close();

   delete tpcTree;
   refFile->Close();

   Stat_t ng=hgood->GetEntries(), nf=hfound->GetEntries();
   if (ng!=0) cout<<"\n\nIntegral efficiency is about "<<nf/ng*100.<<" %\n";
   cout<<"Total number selected of \"good\" tracks ="<<allselected<<endl<<endl;
   cout<<"Total number of found tracks ="<<allfound<<endl;
   cout<<"Total number of \"good\" tracks ="<<allgood<<endl;
   cout<<endl;

   gStyle->SetOptStat(111110);
   gStyle->SetOptFit(1);

   TCanvas *c1=new TCanvas("c1","",0,0,700,850);

   Int_t minc=33; 

   TPad *p1=new TPad("p1","",0,0.3,.5,.6); p1->Draw();
   p1->cd(); p1->SetFillColor(42); p1->SetFrameFillColor(10); 
   hp->SetFillColor(4);  hp->SetXTitle("(mrad)"); 
   if (hp->GetEntries()<minc) hp->Draw(); else hp->Fit("gaus"); c1->cd();

   TPad *p2=new TPad("p2","",0.5,.3,1,.6); p2->Draw(); 
   p2->cd(); p2->SetFillColor(42); p2->SetFrameFillColor(10);
   hl->SetXTitle("(mrad)");
   if (hl->GetEntries()<minc) hl->Draw(); else hl->Fit("gaus"); c1->cd();

   TPad *p3=new TPad("p3","",0,0,0.5,0.3); p3->Draw();
   p3->cd(); p3->SetFillColor(42); p3->SetFrameFillColor(10); 
   hpt->SetXTitle("(%)");
   if (hpt->GetEntries()<minc) hpt->Draw(); else hpt->Fit("gaus"); c1->cd();

   TPad *p4=new TPad("p4","",0.5,0,1,0.3); p4->Draw();
   p4->cd(); p4->SetFillColor(42); p4->SetFrameFillColor(10);
   hmpt->SetXTitle("(%)");
   if (hmpt->GetEntries()<minc) hmpt->Draw(); else hmpt->Fit("gaus"); c1->cd();

   TPad *p5=new TPad("p5","",0,0.6,1,1); p5->Draw(); p5->cd(); 
   p5->SetFillColor(41); p5->SetFrameFillColor(10);
   hfound->Sumw2(); hgood->Sumw2(); hfake->Sumw2();
   hg->Divide(hfound,hgood,1,1.,"b");
   hf->Divide(hfake,hgood,1,1.,"b");
   hg->SetMaximum(1.4);
   hg->SetYTitle("Tracking efficiency");
   hg->SetXTitle("Pt (GeV/c)");
   hg->Draw();

   TLine *line1 = new TLine(ptcutl,1.0,ptcuth,1.0); line1->SetLineStyle(4);
   line1->Draw("same");
   TLine *line2 = new TLine(ptcutl,0.9,ptcuth,0.9); line2->SetLineStyle(4);
   line2->Draw("same");

   hf->SetFillColor(1);
   hf->SetFillStyle(3013);
   hf->SetLineColor(2);
   hf->SetLineWidth(2);
   hf->Draw("histsame");
   TText *text = new TText(0.461176,0.248448,"Fake tracks");
   text->SetTextSize(0.05);
   text->Draw();
   text = new TText(0.453919,1.11408,"Good tracks");
   text->SetTextSize(0.05);
   text->Draw();


   TCanvas *c2=new TCanvas("c2","",320,32,530,590);

   TPad *p6=new TPad("p6","",0.,0.,1.,.5); p6->Draw();
   p6->cd(); p6->SetFillColor(42); p6->SetFrameFillColor(10); 
   he->SetFillColor(2); he->SetFillStyle(3005);  
   he->SetXTitle("Arbitrary Units"); 
   if (he->GetEntries()<minc) he->Draw(); else he->Fit("gaus"); c2->cd();

   TPad *p7=new TPad("p7","",0.,0.5,1.,1.); p7->Draw(); 
   p7->cd(); p7->SetFillColor(42); p7->SetFrameFillColor(10);
   hep->SetXTitle("p (Gev/c)"); hep->SetYTitle("dE/dX (Arb. Units)"); 
   hep->Draw(); c1->cd();

   TFile fc("AliTPCUComparison.root","RECREATE");
   c1->Write();
   c2->Write();
   fc.Close();

   gBenchmark->Stop("AliTPCUComparison");
   gBenchmark->Show("AliTPCUComparison");

   return 0;
}


Int_t GoodTracksTPC(const Char_t *dir) {
   Char_t fname[100];
   sprintf(fname,"%s/galice.root",dir);

   AliRunLoader *rl = AliRunLoader::Open(fname,"COMPARISON");
   if (!rl) {
      ::Error("GoodTracksTPC","Can't start session !");
      return 1;
   }

   rl->LoadgAlice();
   rl->LoadHeader();
   rl->LoadKinematics();
   rl->LoadTrackRefs();

   AliTPCLoader *tpcl = (AliTPCLoader *)rl->GetLoader("TPCLoader");
   if (tpcl == 0x0) {
      ::Error("GoodTracksTPC","Can not find TPCLoader !");
      delete rl;
      return 2;
   }
      
   AliTPC *TPC=(AliTPC*)rl->GetAliRun()->GetDetector("TPC");
   Int_t ver = TPC->IsVersion(); 
   cout<<"TPC version "<<ver<<" has been found !\n";
   if (ver==1) tpcl->LoadRecPoints();
   else if (ver==2) tpcl->LoadDigits();
   else {
      ::Error("GoodTracksTPC","Wrong TPC version !");
      delete rl;
      return 3;
   } 

  TGeoGlobalMagField::Instance()->SetField(
  new AliMagF("Maps","Maps", -1., -1., AliMagF::k5kG));

   AliCDBManager *man=AliCDBManager::Instance();
   man->SetDefaultStorage("local://$ALICE_ROOT/OCDB");
   man->SetRun(0);
   AliTPCParamSR *digp=
   (AliTPCParamSR*)(AliTPCcalibDB::Instance()->GetParameters());
   if (!digp) { 
     ::Error("AliTPCUComparison.C","TPC parameters have not been found !");
     delete rl;
     return 4; 
   }

   Int_t nrow_up=digp->GetNRowUp();
   Int_t nrows=digp->GetNRowLow()+nrow_up;
   Int_t zero=digp->GetZeroSup();
   Int_t gap=Int_t(0.125*nrows), shift=Int_t(0.5*gap);
   Int_t good_number=Int_t(0.4*nrows);

   Int_t nev=rl->GetNumberOfEvents();
   ::Info("GoodTracksTPC","Number of events : %d\n",nev);  


   sprintf(fname,"%s/GoodTracksTPC.root",dir);
   TFile *file=TFile::Open(fname,"recreate");

   TClonesArray dummy("AliTrackReference",1000), *refs=&dummy;
   TTree tpcTree("tpcTree","Tree with info about the reconstructable TPC tracks");
   tpcTree.Branch("TPC",&refs);

   //********  Loop over generated events 
   for (Int_t e=0; e<nev; e++) {
     Int_t nt=0;
     refs->Clear();

     Int_t i;

     rl->GetEvent(e);  file->cd();

     Int_t np = rl->GetHeader()->GetNtrack();
     cout<<"Event "<<e<<" Number of particles: "<<np<<endl;

     //******** Fill the "good" masks
     Int_t *good=new Int_t[np]; for (i=0; i<np; i++) good[i]=0;
     switch (ver) {
     case 1:
       /*
        {
        AliTPCClustersArray *pca=new AliTPCClustersArray, &ca=*pca;
        ca.Setup(digp);
        ca.SetClusterType("AliTPCcluster");
        ca.ConnectTree(tpcl->TreeR());
        Int_t nrows=Int_t(ca.GetTree()->GetEntries());
        for (Int_t n=0; n<nrows; n++) {
          AliSegmentID *s=ca.LoadEntry(n);
          Int_t sec,row;
          digp->AdjustSectorRow(s->GetID(),sec,row);
          AliTPCClustersRow &clrow = *ca.GetRow(sec,row);
          Int_t ncl=clrow.GetArray()->GetEntriesFast();
          while (ncl--) {
              AliTPCcluster *c=(AliTPCcluster*)clrow[ncl];
              Int_t lab=c->GetLabel(0);
              if (lab<0) continue; //noise cluster
              lab=TMath::Abs(lab);

              if (sec>=digp->GetNInnerSector())
                 if (row==nrow_up-1) good[lab]|=0x4000;
              if (sec>=digp->GetNInnerSector())
                 if (row==nrow_up-1-gap) good[lab]|=0x1000;

              if (sec>=digp->GetNInnerSector())
                 if (row==nrow_up-1-shift) good[lab]|=0x2000;
              if (sec>=digp->GetNInnerSector())
                 if (row==nrow_up-1-gap-shift) good[lab]|=0x800;

              good[lab]++;
          }
          ca.ClearRow(sec,row);
        }
        delete pca;
        }
        break;
       */
     case 2:
        {
        TTree *TD=tpcl->TreeD();
      
        AliSimDigits da, *digits=&da;
        TD->GetBranch("Segment")->SetAddress(&digits);

        Int_t *count = new Int_t[np];
        Int_t i;
        for (i=0; i<np; i++) count[i]=0;

        Int_t sectors_by_rows=(Int_t)TD->GetEntries();
        for (i=0; i<sectors_by_rows; i++) {
          if (!TD->GetEvent(i)) continue;
          Int_t sec,row;
          digp->AdjustSectorRow(digits->GetID(),sec,row);
	  //cerr<<sec<<' '<<row<<'\r';
          digits->First();
          do { //Many thanks to J.Chudoba who noticed this
              Int_t it=digits->CurrentRow(), ip=digits->CurrentColumn();
              Short_t dig = digits->GetDigit(it,ip);
              Int_t idx0=digits->GetTrackID(it,ip,0); 
              Int_t idx1=digits->GetTrackID(it,ip,1);
              Int_t idx2=digits->GetTrackID(it,ip,2);
              if (idx0>=0 && dig>=zero && idx0<np) count[idx0]+=1;
              if (idx1>=0 && dig>=zero && idx1<np) count[idx1]+=1;
              if (idx2>=0 && dig>=zero && idx2<np) count[idx2]+=1;
          } while (digits->Next());
          for (Int_t j=0; j<np; j++) {
              if (count[j]>1) {
                 if (sec>=digp->GetNInnerSector())
		   if (row==nrow_up-1    ) good[j]|=0x4000;
                 if (sec>=digp->GetNInnerSector())
		   if (row==nrow_up-1-gap) good[j]|=0x1000;

                 if (sec>=digp->GetNInnerSector())
		   if (row==nrow_up-1-shift) good[j]|=0x2000;
                 if (sec>=digp->GetNInnerSector())
		   if (row==nrow_up-1-gap-shift) good[j]|=0x800;
                 good[j]++;
              }
              count[j]=0;
          }
        }
        delete[] count;
        }
        break;
     }


     //****** select tracks which are "good" enough
     AliStack* stack = rl->Stack();
     for (i=0; i<np; i++) {
        if ((good[i]&0x5000) != 0x5000)
        if ((good[i]&0x2800) != 0x2800) continue;
        if ((good[i]&0x7FF ) < good_number) continue;
        TParticle *p = (TParticle*)stack->Particle(i);
        if (p == 0x0) {
         cerr<<"Can not get particle "<<i<<endl;
         continue;
        }
        if (p->Pt() <= 0.) continue;
        if (TMath::Abs(p->Pz()/p->Pt())>0.999) continue;

        Double_t vx=p->Vx(),vy=p->Vy(),vz=p->Vz();
        if (TMath::Sqrt(vx*vx+vy*vy)>3.5) continue;
        if (TMath::Abs(vz) > 50.) continue;

        AliTrackReference *ref=new((*refs)[nt]) AliTrackReference();

        ref->SetLabel(i);
        Int_t pdg=p->GetPdgCode();
        ref->SetLength(pdg);  //This will the particle's PDG !
        ref->SetMomentum(0.,0.,0.);  
        ref->SetPosition(0.,0.,0.);

        nt++;
     }

     //**** check if there is also information at the entrance of the TPC
     TTree *TR=rl->TreeTR();
     TBranch *branch=TR->GetBranch("TrackReferences");
     if (branch==0) {
        ::Error("GoodTracksTPC","No track references !");
        delete rl;
        return 5;
     }
     TClonesArray tpcdummy("AliTrackReference",1000), *tpcRefs=&tpcdummy;
     branch->SetAddress(&tpcRefs);
     Int_t nr=(Int_t)TR->GetEntries();
     for (Int_t r=0; r<nr; r++) {
         //cerr<<r<<' '<<nr<<'\r';
         TR->GetEvent(r);

	 Int_t nref = tpcRefs->GetEntriesFast();
         if (!nref) continue;
         AliTrackReference *tpcRef= 0x0;	 
	 for (Int_t iref=0; iref<nref; ++iref) {
	   tpcRef = (AliTrackReference*)tpcRefs->UncheckedAt(iref);
	   if (tpcRef->DetectorId() == AliTrackReference::kTPC) break;
	   tpcRef = 0x0;
	 }

	 if (!tpcRef) continue;

         Int_t j;
	 AliTrackReference *ref=0;
         for (j=0; j<nt; j++) {
	   ref=(AliTrackReference *)refs->UncheckedAt(j);
           if (ref->Label()==tpcRef->Label()) break;
           ref=0;
	 }  
         if (ref==0) continue;

         ref->SetMomentum(tpcRef->Px(),tpcRef->Py(),tpcRef->Pz());
         ref->SetPosition(tpcRef->LocalX(),tpcRef->LocalY(),tpcRef->Z());

	 tpcRefs->Clear();
     }

     tpcTree.Fill();

     delete[] good;
   } //****** end of the loop over generated events

   
   tpcTree.Write();
   file->Close();

   delete rl;
   return 0;
}
Commit	Line	Data
5bc07054	1	/****************************************************************************
	2	* Legacy comparison macro, adapted to the upgraded ITS. *
	3	* *
	4	* Creates list of "trackable" tracks, *
	5	* calculates efficiency, resolutions etc. *
	6	* There is a possibility to run this macro over several events. *
	7	* *
	8	* Origin: I.Belikov, IPHC, Iouri.Belikov@iphc.cnrs.fr *
	9	* with several nice improvements by: M.Ivanov, GSI, m.ivanov@gsi.de *
	10	****************************************************************************/
	11
	12	#if !defined(__CINT__) \|\| defined(__MAKECINT__)
	13	#include <TMath.h>
	14	#include <TError.h>
	15	#include <Riostream.h>
	16	#include <TH1F.h>
	17	#include <TH2F.h>
	18	#include <TTree.h>
	19	#include <TParticle.h>
	20	#include <TCanvas.h>
	21	#include <TLine.h>
	22	#include <TText.h>
	23	#include <TBenchmark.h>
	24	#include <TStyle.h>
	25	#include <TFile.h>
	26	#include <TROOT.h>
	27	#include <TGeoGlobalMagField.h>
	28
	29	#include "AliStack.h"
	30	#include "AliHeader.h"
	31	#include "AliTrackReference.h"
	32	#include "AliRunLoader.h"
	33	#include "AliRun.h"
	34	#include "AliMagF.h"
	35	#include "AliESDEvent.h"
	36	#include "AliESDtrack.h"
	37
	38	#include "Base/AliSimDigits.h"
	39	#include "Base/AliTPCParamSR.h"
	40	#include "Base/AliTPCLoader.h"
	41	#include "Base/AliTPCcalibDB.h"
	42	#include "Sim/AliTPC.h"
	43	#include "Rec/AliTPCClustersRow.h"
	44
	45	#include "AliCDBManager.h"
	46	#endif
	47
	48	Int_t GoodTracksTPC(const Char_t *dir=".");
	49
	50	extern TBenchmark *gBenchmark;
	51	extern TROOT *gROOT;
	52
	53	static Int_t allgood=0;
	54	static Int_t allselected=0;
	55	static Int_t allfound=0;
	56
	57	Int_t AliTPCUComparison
6ec85964	58	(Float_t ptcutl=0., Float_t ptcuth=2., const Char_t *dir=".") {
5bc07054	59	gBenchmark->Start("AliTPCUComparison");
	60
	61	::Info("AliTPCUComparison.C","Doing comparison...");
	62
	63
	64
	65	TH1F hp=(TH1F)gROOT->FindObject("hp");
	66	if (!hp) hp=new TH1F("hp","PHI resolution",50,-20.,20.);
	67	hp->SetFillColor(4);
	68
	69	TH1F hl=(TH1F)gROOT->FindObject("hl");
	70	if (!hl) hl=new TH1F("hl","LAMBDA resolution",50,-20,20);
	71	hl->SetFillColor(4);
	72
	73	TH1F hpt=(TH1F)gROOT->FindObject("hpt");
	74	if (!hpt) hpt=new TH1F("hpt","Relative Pt resolution",30,-10.,10.);
	75	hpt->SetFillColor(2);
	76
	77	TH1F hmpt=(TH1F)gROOT->FindObject("hmpt");
	78	if (!hmpt)
	79	hmpt=new TH1F("hmpt","Relative Pt resolution (pt>4GeV/c)",30,-60,60);
	80	hmpt->SetFillColor(6);
	81
	82
6ec85964	83	Int_t nb=100;
5bc07054	84	TH1F hgood=(TH1F)gROOT->FindObject("hgood");
6ec85964	85	if (!hgood) hgood=new TH1F("hgood","Good tracks",nb,ptcutl,ptcuth);
5bc07054	86
5bc07054	87	TH1F hfound=(TH1F)gROOT->FindObject("hfound");
6ec85964	88	if (!hfound) hfound=new TH1F("hfound","Found tracks",nb,ptcutl,ptcuth);
5bc07054	89
5bc07054	90	TH1F hfake=(TH1F)gROOT->FindObject("hfake");
6ec85964	91	if (!hfake) hfake=new TH1F("hfake","Fake tracks",nb,ptcutl,ptcuth);
5bc07054	92
5bc07054	93	TH1F hg=(TH1F)gROOT->FindObject("hg");
6ec85964	94	if (!hg) hg=new TH1F("hg","Efficiency for good tracks",nb,ptcutl,ptcuth);
5bc07054	95	hg->SetLineColor(4); hg->SetLineWidth(2);
	96
	97	TH1F hf=(TH1F)gROOT->FindObject("hf");
6ec85964	98	if (!hf) hf=new TH1F("hf","Efficiency for fake tracks",nb,ptcutl,ptcuth);
5bc07054	99	hf->SetFillColor(1); hf->SetFillStyle(3013); hf->SetLineWidth(2);
5bc07054	100
6ec85964	101
5bc07054	102	TH1F he=(TH1F)gROOT->FindObject("he");
	103	if (!he)
	104	he =new TH1F("he","dE/dX for pions with 0.4<p<0.5 GeV/c",50,0.,100.);
	105
	106	TH2F hep=(TH2F)gROOT->FindObject("hep");
	107	if (!hep) hep=new TH2F("hep","dE/dX vs momentum",50,0.,2.,50,0.,400.);
	108	hep->SetMarkerStyle(8);
	109	hep->SetMarkerSize(0.4);
	110
	111
	112	Char_t fname[100];
	113	sprintf(fname,"%s/GoodTracksTPC.root",dir);
	114
	115	TFile *refFile=TFile::Open(fname,"old");
	116	if (!refFile \|\| !refFile->IsOpen()) {
	117	::Info("AliTPCUComparison.C","Marking good tracks (will take a while)...");
	118	if (GoodTracksTPC(dir)) {
	119	::Error("AliTPCUComparison.C","Can't generate the reference file !");
	120	return 1;
	121	}
	122	}
	123	refFile=TFile::Open(fname,"old");
	124	if (!refFile \|\| !refFile->IsOpen()) {
	125	::Error("AliTPCUComparison.C","Can't open the reference file !");
	126	return 2;
	127	}
	128
	129	TTree tpcTree=(TTree)refFile->Get("tpcTree");
	130	if (!tpcTree) {
	131	::Error("AliTPCUComparison.C","Can't get the reference tree !");
	132	return 3;
	133	}
	134	TBranch *branch=tpcTree->GetBranch("TPC");
	135	if (!branch) {
	136	::Error("AliTPCUComparison.C","Can't get the TPC branch !");
	137	return 4;
	138	}
	139	TClonesArray dummy("AliTrackReference",1000), *refs=&dummy;
	140	branch->SetAddress(&refs);
	141
	142
	143	sprintf(fname,"%s/AliESDs.root",dir);
	144	TFile *ef=TFile::Open(fname);
	145	if ((!ef)\|\|(!ef->IsOpen())) {
	146	sprintf(fname,"%s/AliESDtpc.root",dir);
	147	ef=TFile::Open(fname);
	148	if ((!ef)\|\|(!ef->IsOpen())) {
	149	::Error("AliTPCUComparison.C","Can't open AliESDtpc.root !");
	150	return 5;
	151	}
	152	}
	153	AliESDEvent* event = new AliESDEvent();
	154	TTree* esdTree = (TTree*) ef->Get("esdTree");
	155	if (!esdTree) {
	156	::Error("AliTPCUComparison.C", "no ESD tree found");
	157	return 6;
	158	}
	159	event->ReadFromTree(esdTree);
	160
	161
	162	//***** Loop over events *******
	163	Int_t e=0;
	164	while (esdTree->GetEvent(e)) {
	165	cout<<endl<<endl<<"******* Processing event number: "<<e<<"*****\n";
166
167	Int_t nentr=event->GetNumberOfTracks();
168	allfound+=nentr;
169
170	if (tpcTree->GetEvent(e++)==0) {
171	cerr<<"No reconstructable tracks !\n";
172	continue;
173	}
174
175	Int_t ngood=refs->GetEntriesFast();
176	allgood+=ngood;
177
178	const Int_t MAX=15000;
179	//MI change
180	Int_t track_notfound[MAX], itrack_notfound=0;
181	Int_t track_fake[MAX], itrack_fake=0;
182	Int_t track_multifound[MAX],track_multifound_n[MAX],itrack_multifound=0;
183
184	Int_t i;
185	for (Int_t k=0; k<ngood; k++) {
186	AliTrackReference ref=(AliTrackReference)refs->UncheckedAt(k);
187	Int_t lab=ref->Label(), tlab=-1;
188	Float_t ptg=TMath::Sqrt(ref->Px()ref->Px() + ref->Py()ref->Py());
189
190	if (ptg<1e-33) continue; // for those not crossing 0 pad row
191
192	if (ptg<ptcutl) continue;
193	if (ptg>ptcuth) continue;
194
195	allselected++;
196
197	hgood->Fill(ptg);
198
199	AliESDtrack *track=0;
200	for (i=0; i<nentr; i++) {
201	track=event->GetTrack(i);
202	tlab=track->GetTPCLabel();
203	if (lab==TMath::Abs(tlab)) break;
204	}
205	if (i==nentr) {
206	track_notfound[itrack_notfound++]=lab;
207	continue;
208	}
209
210	//MI change - addition
211	Int_t micount=0;
212	Int_t mi;
213	AliESDtrack * mitrack;
214	for (mi=0; mi<nentr; mi++) {
215	mitrack=event->GetTrack(mi);
216	if (lab==TMath::Abs(mitrack->GetTPCLabel())) micount++;
217	}
218	if (micount>1) {
219	track_multifound[itrack_multifound]=lab;
220	track_multifound_n[itrack_multifound]=micount;
221	itrack_multifound++;
222	}
223	if ((track->GetStatus()&AliESDtrack::kTPCrefit)==0) continue;
224	if (lab==tlab) hfound->Fill(ptg);
225	else {
226	track_fake[itrack_fake++]=lab;
227	hfake->Fill(ptg);
228	}
229
230	Double_t pxpypz[3]; track->GetInnerPxPyPz(pxpypz);
231	Float_t phi=TMath::ATan2(pxpypz[1],pxpypz[0]);
232	if (phi<-TMath::Pi()) phi+=2*TMath::Pi();
233	if (phi>=TMath::Pi()) phi-=2*TMath::Pi();
234	Double_t pt=TMath::Sqrt(pxpypz[0]pxpypz[0]+pxpypz[1]pxpypz[1]);
235	Float_t lam=TMath::ATan2(pxpypz[2],pt);
236	Float_t pt_1=1/pt;
237
238	Int_t pdg=(Int_t)ref->GetLength(); //this is particle's PDG !
239
240	if (TMath::Abs(pdg)==11 && ptg>4.) {//high momentum electrons
241	hmpt->Fill((pt_1 - 1/ptg)/(1/ptg)*100.);
242	} else {
243	Float_t phig=TMath::ATan2(ref->Py(),ref->Px());
244	hp->Fill((phi - phig)*1000.);
245
246	Float_t lamg=TMath::ATan2(ref->Pz(),ptg);
247	hl->Fill((lam - lamg)*1000.);
248
249	hpt->Fill((pt_1 - 1/ptg)/(1/ptg)*100.);
250	}
251
252	Float_t mom=pt/TMath::Cos(lam);
253	Float_t dedx=track->GetTPCsignal();
254	hep->Fill(mom,dedx,1.);
255	if (TMath::Abs(pdg)==211) //pions
256	if (mom>0.4 && mom<0.5) {
257	he->Fill(dedx,1.);
258	}
259	}
260
261	cout<<"\nList of Not found tracks :\n";
262	for ( i = 0; i< itrack_notfound; i++){
263	cout<<track_notfound[i]<<"\t";
264	if ((i%5)==4) cout<<"\n";
265	}
266	cout<<"\nList of fake tracks :\n";
267	for ( i = 0; i< itrack_fake; i++){
268	cout<<track_fake[i]<<"\t";
269	if ((i%5)==4) cout<<"\n";
270	}
271	cout<<"\nList of multiple found tracks :\n";
272	for ( i=0; i<itrack_multifound; i++) {
273	cout<<"id. "<<track_multifound[i]
274	<<" found - "<<track_multifound_n[i]<<"times\n";
275	}
276
277	cout<<"Number of found tracks ="<<nentr<<endl;
278	cout<<"Number of \"good\" tracks ="<<ngood<<endl;
279
280	refs->Clear();
281	}// ***** End of the loop over events
282
283	delete event;
284	delete esdTree;
285	ef->Close();
286
287	delete tpcTree;
288	refFile->Close();
289
290	Stat_t ng=hgood->GetEntries(), nf=hfound->GetEntries();
291	if (ng!=0) cout<<"\n\nIntegral efficiency is about "<<nf/ng*100.<<" %\n";
292	cout<<"Total number selected of \"good\" tracks ="<<allselected<<endl<<endl;
293	cout<<"Total number of found tracks ="<<allfound<<endl;
294	cout<<"Total number of \"good\" tracks ="<<allgood<<endl;
295	cout<<endl;
296
297	gStyle->SetOptStat(111110);
298	gStyle->SetOptFit(1);
299
300	TCanvas *c1=new TCanvas("c1","",0,0,700,850);
301
302	Int_t minc=33;
303
304	TPad *p1=new TPad("p1","",0,0.3,.5,.6); p1->Draw();
305	p1->cd(); p1->SetFillColor(42); p1->SetFrameFillColor(10);
306	hp->SetFillColor(4); hp->SetXTitle("(mrad)");
307	if (hp->GetEntries()<minc) hp->Draw(); else hp->Fit("gaus"); c1->cd();
308
309	TPad *p2=new TPad("p2","",0.5,.3,1,.6); p2->Draw();
310	p2->cd(); p2->SetFillColor(42); p2->SetFrameFillColor(10);
311	hl->SetXTitle("(mrad)");
312	if (hl->GetEntries()<minc) hl->Draw(); else hl->Fit("gaus"); c1->cd();
313
314	TPad *p3=new TPad("p3","",0,0,0.5,0.3); p3->Draw();
315	p3->cd(); p3->SetFillColor(42); p3->SetFrameFillColor(10);
316	hpt->SetXTitle("(%)");
317	if (hpt->GetEntries()<minc) hpt->Draw(); else hpt->Fit("gaus"); c1->cd();
318
319	TPad *p4=new TPad("p4","",0.5,0,1,0.3); p4->Draw();
320	p4->cd(); p4->SetFillColor(42); p4->SetFrameFillColor(10);
321	hmpt->SetXTitle("(%)");
322	if (hmpt->GetEntries()<minc) hmpt->Draw(); else hmpt->Fit("gaus"); c1->cd();
323
324	TPad *p5=new TPad("p5","",0,0.6,1,1); p5->Draw(); p5->cd();
325	p5->SetFillColor(41); p5->SetFrameFillColor(10);
326	hfound->Sumw2(); hgood->Sumw2(); hfake->Sumw2();
327	hg->Divide(hfound,hgood,1,1.,"b");
328	hf->Divide(hfake,hgood,1,1.,"b");
329	hg->SetMaximum(1.4);
330	hg->SetYTitle("Tracking efficiency");
331	hg->SetXTitle("Pt (GeV/c)");
332	hg->Draw();
333
6ec85964	334	TLine *line1 = new TLine(ptcutl,1.0,ptcuth,1.0); line1->SetLineStyle(4);
5bc07054	335	line1->Draw("same");
6ec85964	336	TLine *line2 = new TLine(ptcutl,0.9,ptcuth,0.9); line2->SetLineStyle(4);
5bc07054	337	line2->Draw("same");
	338
	339	hf->SetFillColor(1);
	340	hf->SetFillStyle(3013);
	341	hf->SetLineColor(2);
	342	hf->SetLineWidth(2);
	343	hf->Draw("histsame");
	344	TText *text = new TText(0.461176,0.248448,"Fake tracks");
	345	text->SetTextSize(0.05);
	346	text->Draw();
	347	text = new TText(0.453919,1.11408,"Good tracks");
	348	text->SetTextSize(0.05);
	349	text->Draw();
	350
	351
	352
	353	TCanvas *c2=new TCanvas("c2","",320,32,530,590);
	354
	355	TPad *p6=new TPad("p6","",0.,0.,1.,.5); p6->Draw();
	356	p6->cd(); p6->SetFillColor(42); p6->SetFrameFillColor(10);
	357	he->SetFillColor(2); he->SetFillStyle(3005);
	358	he->SetXTitle("Arbitrary Units");
	359	if (he->GetEntries()<minc) he->Draw(); else he->Fit("gaus"); c2->cd();
	360
	361	TPad *p7=new TPad("p7","",0.,0.5,1.,1.); p7->Draw();
	362	p7->cd(); p7->SetFillColor(42); p7->SetFrameFillColor(10);
	363	hep->SetXTitle("p (Gev/c)"); hep->SetYTitle("dE/dX (Arb. Units)");
	364	hep->Draw(); c1->cd();
	365
	366	TFile fc("AliTPCUComparison.root","RECREATE");
	367	c1->Write();
	368	c2->Write();
	369	fc.Close();
	370
	371	gBenchmark->Stop("AliTPCUComparison");
	372	gBenchmark->Show("AliTPCUComparison");
	373
	374	return 0;
	375	}
	376
	377
	378	Int_t GoodTracksTPC(const Char_t *dir) {
	379	Char_t fname[100];
	380	sprintf(fname,"%s/galice.root",dir);
	381
	382	AliRunLoader *rl = AliRunLoader::Open(fname,"COMPARISON");
	383	if (!rl) {
	384	::Error("GoodTracksTPC","Can't start session !");
	385	return 1;
	386	}
	387
	388	rl->LoadgAlice();
	389	rl->LoadHeader();
	390	rl->LoadKinematics();
	391	rl->LoadTrackRefs();
	392
	393	AliTPCLoader tpcl = (AliTPCLoader )rl->GetLoader("TPCLoader");
	394	if (tpcl == 0x0) {
	395	::Error("GoodTracksTPC","Can not find TPCLoader !");
	396	delete rl;
	397	return 2;
	398	}
	399
	400	AliTPC TPC=(AliTPC)rl->GetAliRun()->GetDetector("TPC");
401	Int_t ver = TPC->IsVersion();
402	cout<<"TPC version "<<ver<<" has been found !\n";
403	if (ver==1) tpcl->LoadRecPoints();
404	else if (ver==2) tpcl->LoadDigits();
405	else {
406	::Error("GoodTracksTPC","Wrong TPC version !");
407	delete rl;
408	return 3;
409	}
410
411	TGeoGlobalMagField::Instance()->SetField(
412	new AliMagF("Maps","Maps", -1., -1., AliMagF::k5kG));
413
414	AliCDBManager *man=AliCDBManager::Instance();
415	man->SetDefaultStorage("local://$ALICE_ROOT/OCDB");
416	man->SetRun(0);
417	AliTPCParamSR *digp=
418	(AliTPCParamSR*)(AliTPCcalibDB::Instance()->GetParameters());
419	if (!digp) {
420	::Error("AliTPCUComparison.C","TPC parameters have not been found !");
421	delete rl;
422	return 4;
423	}
424
425	Int_t nrow_up=digp->GetNRowUp();
426	Int_t nrows=digp->GetNRowLow()+nrow_up;
427	Int_t zero=digp->GetZeroSup();
428	Int_t gap=Int_t(0.125nrows), shift=Int_t(0.5gap);
429	Int_t good_number=Int_t(0.4*nrows);
430
431	Int_t nev=rl->GetNumberOfEvents();
432	::Info("GoodTracksTPC","Number of events : %d\n",nev);
433
434
435	sprintf(fname,"%s/GoodTracksTPC.root",dir);
436	TFile *file=TFile::Open(fname,"recreate");
437
438	TClonesArray dummy("AliTrackReference",1000), *refs=&dummy;
439	TTree tpcTree("tpcTree","Tree with info about the reconstructable TPC tracks");
440	tpcTree.Branch("TPC",&refs);
441
442	//******** Loop over generated events
443	for (Int_t e=0; e<nev; e++) {
444	Int_t nt=0;
445	refs->Clear();
446
447	Int_t i;
448
449	rl->GetEvent(e); file->cd();
450
451	Int_t np = rl->GetHeader()->GetNtrack();
452	cout<<"Event "<<e<<" Number of particles: "<<np<<endl;
453
454	//******** Fill the "good" masks
455	Int_t *good=new Int_t[np]; for (i=0; i<np; i++) good[i]=0;
456	switch (ver) {
457	case 1:
458	/*
459	{
460	AliTPCClustersArray pca=new AliTPCClustersArray, &ca=pca;
461	ca.Setup(digp);
462	ca.SetClusterType("AliTPCcluster");
463	ca.ConnectTree(tpcl->TreeR());
464	Int_t nrows=Int_t(ca.GetTree()->GetEntries());
465	for (Int_t n=0; n<nrows; n++) {
466	AliSegmentID *s=ca.LoadEntry(n);
467	Int_t sec,row;
468	digp->AdjustSectorRow(s->GetID(),sec,row);
469	AliTPCClustersRow &clrow = *ca.GetRow(sec,row);
470	Int_t ncl=clrow.GetArray()->GetEntriesFast();
471	while (ncl--) {
472	AliTPCcluster c=(AliTPCcluster)clrow[ncl];
473	Int_t lab=c->GetLabel(0);
474	if (lab<0) continue; //noise cluster
475	lab=TMath::Abs(lab);
476
477	if (sec>=digp->GetNInnerSector())
478	if (row==nrow_up-1) good[lab]\|=0x4000;
479	if (sec>=digp->GetNInnerSector())
480	if (row==nrow_up-1-gap) good[lab]\|=0x1000;
481
482	if (sec>=digp->GetNInnerSector())
483	if (row==nrow_up-1-shift) good[lab]\|=0x2000;
484	if (sec>=digp->GetNInnerSector())
485	if (row==nrow_up-1-gap-shift) good[lab]\|=0x800;
486
487	good[lab]++;
488	}
489	ca.ClearRow(sec,row);
490	}
491	delete pca;
492	}
493	break;
494	*/
495	case 2:
496	{
497	TTree *TD=tpcl->TreeD();
498
499	AliSimDigits da, *digits=&da;
500	TD->GetBranch("Segment")->SetAddress(&digits);
501
502	Int_t *count = new Int_t[np];
503	Int_t i;
504	for (i=0; i<np; i++) count[i]=0;
505
506	Int_t sectors_by_rows=(Int_t)TD->GetEntries();
507	for (i=0; i<sectors_by_rows; i++) {
508	if (!TD->GetEvent(i)) continue;
509	Int_t sec,row;
510	digp->AdjustSectorRow(digits->GetID(),sec,row);
511	//cerr<<sec<<' '<<row<<'\r';
512	digits->First();
513	do { //Many thanks to J.Chudoba who noticed this
514	Int_t it=digits->CurrentRow(), ip=digits->CurrentColumn();
515	Short_t dig = digits->GetDigit(it,ip);
516	Int_t idx0=digits->GetTrackID(it,ip,0);
517	Int_t idx1=digits->GetTrackID(it,ip,1);
518	Int_t idx2=digits->GetTrackID(it,ip,2);
519	if (idx0>=0 && dig>=zero && idx0<np) count[idx0]+=1;
520	if (idx1>=0 && dig>=zero && idx1<np) count[idx1]+=1;
521	if (idx2>=0 && dig>=zero && idx2<np) count[idx2]+=1;
522	} while (digits->Next());
523	for (Int_t j=0; j<np; j++) {
524	if (count[j]>1) {
525	if (sec>=digp->GetNInnerSector())
526	if (row==nrow_up-1 ) good[j]\|=0x4000;
527	if (sec>=digp->GetNInnerSector())
528	if (row==nrow_up-1-gap) good[j]\|=0x1000;
529
530	if (sec>=digp->GetNInnerSector())
531	if (row==nrow_up-1-shift) good[j]\|=0x2000;
532	if (sec>=digp->GetNInnerSector())
533	if (row==nrow_up-1-gap-shift) good[j]\|=0x800;
534	good[j]++;
535	}
536	count[j]=0;
537	}
538	}
539	delete[] count;
540	}
541	break;
542	}
543
544
545	//****** select tracks which are "good" enough
546	AliStack* stack = rl->Stack();
547	for (i=0; i<np; i++) {
548	if ((good[i]&0x5000) != 0x5000)
549	if ((good[i]&0x2800) != 0x2800) continue;
550	if ((good[i]&0x7FF ) < good_number) continue;
5bc07054	551	TParticle p = (TParticle)stack->Particle(i);
	552	if (p == 0x0) {
	553	cerr<<"Can not get particle "<<i<<endl;
	554	continue;
	555	}
6ec85964	556	if (p->Pt() <= 0.) continue;
5bc07054	557	if (TMath::Abs(p->Pz()/p->Pt())>0.999) continue;
	558
	559	Double_t vx=p->Vx(),vy=p->Vy(),vz=p->Vz();
	560	if (TMath::Sqrt(vxvx+vyvy)>3.5) continue;
	561	if (TMath::Abs(vz) > 50.) continue;
	562
	563	AliTrackReference ref=new((refs)[nt]) AliTrackReference();
	564
	565	ref->SetLabel(i);
	566	Int_t pdg=p->GetPdgCode();
	567	ref->SetLength(pdg); //This will the particle's PDG !
	568	ref->SetMomentum(0.,0.,0.);
	569	ref->SetPosition(0.,0.,0.);
	570
	571	nt++;
	572	}
	573
	574	//**** check if there is also information at the entrance of the TPC
	575	TTree *TR=rl->TreeTR();
	576	TBranch *branch=TR->GetBranch("TrackReferences");
	577	if (branch==0) {
	578	::Error("GoodTracksTPC","No track references !");
	579	delete rl;
	580	return 5;
	581	}
	582	TClonesArray tpcdummy("AliTrackReference",1000), *tpcRefs=&tpcdummy;
	583	branch->SetAddress(&tpcRefs);
	584	Int_t nr=(Int_t)TR->GetEntries();
	585	for (Int_t r=0; r<nr; r++) {
	586	//cerr<<r<<' '<<nr<<'\r';
	587	TR->GetEvent(r);
	588
	589	Int_t nref = tpcRefs->GetEntriesFast();
	590	if (!nref) continue;
	591	AliTrackReference *tpcRef= 0x0;
	592	for (Int_t iref=0; iref<nref; ++iref) {
	593	tpcRef = (AliTrackReference*)tpcRefs->UncheckedAt(iref);
	594	if (tpcRef->DetectorId() == AliTrackReference::kTPC) break;
	595	tpcRef = 0x0;
	596	}
	597
	598	if (!tpcRef) continue;
	599
	600	Int_t j;
	601	AliTrackReference *ref=0;
	602	for (j=0; j<nt; j++) {
	603	ref=(AliTrackReference *)refs->UncheckedAt(j);
	604	if (ref->Label()==tpcRef->Label()) break;
	605	ref=0;
	606	}
	607	if (ref==0) continue;
	608
	609	ref->SetMomentum(tpcRef->Px(),tpcRef->Py(),tpcRef->Pz());
	610	ref->SetPosition(tpcRef->LocalX(),tpcRef->LocalY(),tpcRef->Z());
	611
	612	tpcRefs->Clear();
	613	}
	614
	615	tpcTree.Fill();
	616
	617	delete[] good;
	618	} //****** end of the loop over generated events
	619
	620
621	tpcTree.Write();
622	file->Close();
623
624	delete rl;
625	return 0;
626	}