TPC/AliTPCSavePID.C

   1 ////////////////////////////////////////////////
   2 // Dubna, 22 Jan 2003                         //
   3 ////////////////////////////////////////////////
   4 Int_t AliTPCSavePID(Int_t emax=3) {
   5 ///////////////////////////////////////
   6 #include<fstream.h>
   7 TFile *inkin = TFile::Open("galice.root");
   8 if (!inkin->IsOpen()) {
   9   cerr<<"Can't open galice.root !\n";
  10 }
  11 gAlice = (AliRun*)inkin->Get("gAlice");
  12 cout<<"AliRun object found on file "<<gAlice<<endl;
  13 cout<<"!!!! field ="<<gAlice->Field()->SolenoidField()<<endl;
  14 AliKalmanTrack::SetConvConst(1000/0.299792458/gAlice->Field()->SolenoidField());
  15 inkin->Close();
  16  cout<<" Convconst="<<AliKalmanTrack::GetConvConst()<<endl;
  17 ///////////////////////////////////////
  18 AliTPCtrack *iotrack=0;
  19 TFile *tf=TFile::Open("AliTPCtracks.root");
  20    if (!tf->IsOpen()) {cerr<<"Can't open AliTPCtracks.root !\n"; return 3;}
  21
  22 AliTPCPid pid;
  23 AliTPCtrackPid pidtmp;
  24 AliTPCtrackPid *outpid=&pidtmp;
  25 TFile fpid("AliTPCtracksPid.root","recreate");
  26
  27  Int_t nentr=0,i=0;
  28  for(int je=0;je<emax;je++){
  29    char tname[100]; sprintf(tname,"TreeT_TPC_%d",je);
  30    TTree *tracktree=(TTree*)tf->Get(tname);
  31    if (!tracktree) {cerr<<"Can't get a tree with TPC tracks !\n"; return 4;}
  32
  33    TBranch *tbranch=tracktree->GetBranch("tracks");
  34    nentr=(Int_t)tracktree->GetEntries();
  35    cout<<nentr<<" "<<" tracks in track tree "<<tname<<"."<<endl;
  36
  37     char tpname[100]; sprintf(tpname,"TreeT%d",je);
  38     TTree *ptree = new  TTree(tpname,"Tree with PID");
  39     ptree->Branch("pids","AliTPCtrackPid",&outpid,32000,1);
  40
  41    for (i=0; i<nentr; i++) {
  42        iotrack=new AliTPCtrack;
  43        tbranch->SetAddress(&iotrack);
  44        tracktree->GetEvent(i);
  45       Double_t par[5],xx;xx=85.1951;
  46       iotrack->PropagateTo(xx);
  47       iotrack->GetExternalParameters(xx,par);
  48       //cout<<" par="<<par[0]<<" "<<par[1]<<" "<<par[2]<<" "<<par[3]<<" "<<par[4]<<endl;
  49       Float_t phi=TMath::ASin(par[2]) + iotrack->GetAlpha();
  50       if (phi<-TMath::Pi()) phi+=2*TMath::Pi();
  51       if (phi>=TMath::Pi()) phi-=2*TMath::Pi();
  52       Float_t lam=TMath::ATan(par[3]);
  53       Float_t pt_1=TMath::Abs(par[4]);
  54       //cout<<"pt_1,lam="<<pt_1<<" "<<lam<<endl;
  55     if(pt_1!=0.){
  56       Float_t mom=1./(pt_1*TMath::Cos(lam));
  57       Float_t dedx=iotrack->GetdEdx();
  58       Int_t pcode=pid.GetPcode(dedx/50.,mom);
  59        pidtmp.fPcode=pcode;
  60        pidtmp.fSignal=dedx;
  61        pidtmp.fMom=mom;
  62        pidtmp.fPhi=phi;
  63        pidtmp.fLam=lam;
  64        pidtmp.fWpi=pid.fWpi;
  65        pidtmp.fWk=pid.fWk;
  66        pidtmp.fWp=pid.fWp;
  67        pidtmp.fLabel=TMath::Abs(iotrack->GetLabel());
  68        cout<<"tlab,dedx,mom,pcode="<<pidtmp.fLabel<<" "<<dedx<<" "<<mom<<" "<<pcode<<endl;
  69        ptree->Fill();
  70      }//if(pt...
  71    }//for(i...
  72   cout<<"Event "<<je+1<<" ok."<<endl;
  73    delete tracktree;
  74  }//End for(je...)
  75 tf->Close();
  76 fpid.Write();
  77 cout<<"File AliTPCtracksPid.root written"<<endl;
  78 return 0;
  79 }