ITS/save_pidV2.C

   1 ////////////////////////////////////////////////////////////
   2 // Test macro for AliITSPid class and tracking version V2 //
   3 ////////////////////////////////////////////////////////////
   4 void
   5 save_pidV2(Int_t evNumber1=0,Int_t evNumber2=0) {
   6   const char *filename="AliITStracksV2.root";
   7
   8   if (gClassTable->GetID("AliRun") < 0) {
   9     gROOT->LoadMacro("loadlibs.C");    loadlibs();
  10       } else {    delete gAlice;    gAlice=0;
  11   }
  12
  13    TFile *file = (TFile*)gROOT->GetListOfFiles()->FindObject(filename);
  14    if (!file) file = new TFile(filename);
  15
  16 TFile *fpid = new TFile("AliITStracksV2Pid.root","recreate");
  17  Float_t factor=0;
  18  if(gAlice!=0)factor=gAlice->Field()->Factor();
  19  if(factor==0.)factor=1.;
  20  AliKalmanTrack::SetConvConst(100/0.299792458/0.2/factor);
  21
  22 //
  23 //   Loop over events
  24 //
  25  for (int nev=0; nev<= evNumber2; nev++) {
  26    char tname[30];
  27    sprintf(tname,"TreeT_ITS_%d;1",nev);
  28    TTree *tracktree=(TTree*)file->Get(tname);
  29    TBranch *tbranch=tracktree->GetBranch("tracks");
  30
  31    Int_t nentr=tracktree->GetEntries();
  32    cout<<"Found "<<nentr<<" ITS tracks in event No "<<nev<<endl;
  33
  34    char tpidname[30];
  35    sprintf(tpidname,"TreeT%d",nev);
  36    AliITStrackV2Pid pidtmp;
  37    TTree itspidTree(tpidname,"Tree with PID");
  38    AliITStrackV2Pid *outpid=&pidtmp;
  39    itspidTree.Branch("pids","AliITStrackV2Pid",&outpid,32000,1);
  40    AliITSPid pid;
  41
  42    AliITStrackV2 *iotrack=0;
  43    for (Int_t i=0; i<nentr; i++) {
  44       AliITStrackV2 *iotrack=new AliITStrackV2;
  45        tbranch->SetAddress(&iotrack);
  46        tracktree->GetEvent(i);
  47               Int_t    pcode=pid->GetPcode(iotrack);
  48               Float_t  signal=iotrack->GetdEdx();
  49               //iotrack->Propagate(iotrack->GetAlpha(),3.,0.1/65.19*1.848,0.1*1.848);
  50               iotrack->PropagateTo(3.,0.0028,65.19);
  51
  52               iotrack->PropagateToVertex();
  53               Double_t xk,par[5]; iotrack->GetExternalParameters(xk,par);
  54               Float_t lam=TMath::ATan(par[3]);
  55               Float_t pt_1=TMath::Abs(par[4]);
  56               Float_t mom=0.;
  57               if( (pt_1*TMath::Cos(lam))!=0. ){ mom=1./(pt_1*TMath::Cos(lam)); }else{mom=0.;};
  58        pidtmp.fPcode=pcode;
  59        pidtmp.fSignal=signal;
  60        pidtmp.fMom=mom;
  61        itspidTree.Fill();
  62        delete iotrack;
  63    }// End for i (tracks)
  64  fpid->Write();
  65  }// End for nev (events)
  66  fpid->Close();
  67  file->Close();
  68  cout<<"File AliITStracksV2Pid.root written"<<endl;
  69  return;
  70 ///////////////////////////////////////////////////////
  71 }
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