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[u/mrichter/AliRoot.git] / TPC / AliTPCSavePID.C
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31ab0ad9 1////////////////////////////////////////////////
2// Dubna, 22 Jan 2003 //
3////////////////////////////////////////////////
4Int_t AliTPCSavePID(Int_t emax=3) {
5///////////////////////////////////////
6#include<fstream.h>
7TFile *inkin = TFile::Open("galice.root");
8if (!inkin->IsOpen()) {
9 cerr<<"Can't open galice.root !\n";
10}
11gAlice = (AliRun*)inkin->Get("gAlice");
12cout<<"AliRun object found on file "<<gAlice<<endl;
13cout<<"!!!! field ="<<gAlice->Field()->SolenoidField()<<endl;
14AliKalmanTrack::SetConvConst(1000/0.299792458/gAlice->Field()->SolenoidField());
15inkin->Close();
16 cout<<" Convconst="<<AliKalmanTrack::GetConvConst()<<endl;
17///////////////////////////////////////
18AliTPCtrack *iotrack=0;
19TFile *tf=TFile::Open("AliTPCtracks.root");
20 if (!tf->IsOpen()) {cerr<<"Can't open AliTPCtracks.root !\n"; return 3;}
21
22AliTPCPid pid;
23AliTPCtrackPid pidtmp;
24AliTPCtrackPid *outpid=&pidtmp;
25TFile 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...)
75tf->Close();
76fpid.Write();
77cout<<"File AliTPCtracksPid.root written"<<endl;
78return 0;
79}