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e23730c7 | 1 | //******************************************************************** |
2 | // Example (very naive for the moment) of the data analysis | |
3 | // using the ESD classes. | |
4 | // It demonstrates the idea of the "combined PID" | |
5 | // applied to the Lambda0 reconstruction. | |
6 | // Origin: Iouri Belikov, CERN, Jouri.Belikov@cern.ch | |
7 | //******************************************************************** | |
8 | ||
9 | #if !defined( __CINT__) || defined(__MAKECINT__) | |
10 | #include <Riostream.h> | |
3088e2dd | 11 | #include <TROOT.h> |
8b462fd8 | 12 | #include <TTree.h> |
9d0d65be | 13 | #include <TFile.h> |
14 | #include <TH1F.h> | |
15 | #include <TCanvas.h> | |
e23730c7 | 16 | |
86ad5fcb | 17 | #include "AliESDEvent.h" |
b4eb042a | 18 | #include "AliESDv0.h" |
e23730c7 | 19 | #endif |
20 | ||
3088e2dd | 21 | extern TROOT *gROOT; |
22 | ||
9d0d65be | 23 | Int_t AliESDv0Analysis(const Char_t *dir=".") { |
24 | TH1F *hm=(TH1F*)gROOT->FindObject("hm"); | |
25 | if (!hm) { | |
26 | hm=new TH1F("hm","Lambda+LambdaBar Effective Mass",60,1.065,1.165); | |
27 | hm->SetXTitle("Mass (GeV/c**2)"); | |
28 | } | |
29 | Char_t fname[100]; | |
30 | sprintf(fname,"%s/AliESDs.root",dir); | |
31 | TFile *ef=TFile::Open(fname); | |
32 | if (!ef||!ef->IsOpen()) {cerr<<"Can't AliESDs.root !\n"; return 1;} | |
33 | cerr<<"\n****** "<<fname<<" ******\n"; | |
e23730c7 | 34 | |
4514157e | 35 | AliESDEvent* event = new AliESDEvent(); |
9d0d65be | 36 | |
37 | ||
8b462fd8 | 38 | TTree* tree = (TTree*) ef->Get("esdTree"); |
39 | if (!tree) {cerr<<"no ESD tree found\n"; return 1;}; | |
86ad5fcb | 40 | event->ReadFromTree(tree); |
e23730c7 | 41 | |
e23730c7 | 42 | Int_t rc=0,n=0; |
e23730c7 | 43 | |
44 | //****** Tentative particle type "concentrations" | |
9d0d65be | 45 | Double_t c[5]={0.0, 0.0, 1, 0, 1}; |
3088e2dd | 46 | AliPID pid; |
47 | pid.SetPriors(c); | |
e23730c7 | 48 | |
49 | //******* The loop over events | |
4ca848eb | 50 | while (tree->GetEvent(n)) { |
e23730c7 | 51 | |
52 | cerr<<"Processing event number : "<<n++<<endl; | |
53 | ||
e23730c7 | 54 | Int_t nv0=event->GetNumberOfV0s(); |
55 | cerr<<"Number of ESD v0s : "<<nv0<<endl; | |
56 | ||
57 | while (nv0--) { | |
58 | AliESDv0 *v0=event->GetV0(nv0); | |
9d0d65be | 59 | |
60 | Int_t protonIdx=v0->GetPindex(); | |
61 | Int_t pionIdx =v0->GetNindex(); | |
62 | ||
63 | v0->ChangeMassHypothesis(3122); | |
64 | Double_t mass=v0->GetEffMass(); | |
4ca848eb | 65 | if (mass>1.17) { //check also the LambdaBar hypothesis |
9d0d65be | 66 | v0->ChangeMassHypothesis(-3122); |
67 | mass=v0->GetEffMass(); | |
68 | if (mass>1.17) continue; | |
69 | Int_t tmp=protonIdx; protonIdx=pionIdx; pionIdx=tmp; | |
70 | } | |
71 | ||
72 | AliESDtrack *protonTrk=event->GetTrack(protonIdx); | |
73 | AliESDtrack *pionTrk =event->GetTrack(pionIdx); | |
74 | ||
75 | if (protonTrk->GetP()<0.5) continue; | |
76 | ||
77 | // Check if the "proton track" is a proton | |
78 | if ((protonTrk->GetStatus()&AliESDtrack::kESDpid)!=0) { | |
79 | Double_t r[10]; protonTrk->GetESDpid(r); | |
3088e2dd | 80 | pid.SetProbabilities(r); |
4ca848eb | 81 | Double_t pp=pid.GetProbability(AliPID::kProton); |
82 | if (pp < pid.GetProbability(AliPID::kElectron)) continue; | |
83 | if (pp < pid.GetProbability(AliPID::kMuon)) continue; | |
84 | if (pp < pid.GetProbability(AliPID::kPion)) continue; | |
85 | if (pp < pid.GetProbability(AliPID::kKaon)) continue; | |
e23730c7 | 86 | } |
9d0d65be | 87 | |
88 | //Check if the "pion track" is a pion | |
89 | if ((pionTrk->GetStatus()&AliESDtrack::kESDpid)!=0) { | |
90 | Double_t r[10]; pionTrk->GetESDpid(r); | |
3088e2dd | 91 | pid.SetProbabilities(r); |
4ca848eb | 92 | Double_t ppi=pid.GetProbability(AliPID::kPion); |
93 | if (ppi < pid.GetProbability(AliPID::kElectron)) continue; | |
94 | if (ppi < pid.GetProbability(AliPID::kMuon)) continue; | |
95 | if (ppi < pid.GetProbability(AliPID::kKaon)) continue; | |
96 | if (ppi < pid.GetProbability(AliPID::kProton)) continue; | |
97 | } | |
9d0d65be | 98 | |
e23730c7 | 99 | hm->Fill(mass); |
100 | } | |
9d0d65be | 101 | |
e23730c7 | 102 | } |
103 | ||
8b462fd8 | 104 | delete event; |
4514157e | 105 | delete tree; |
8b462fd8 | 106 | ef->Close(); |
107 | ||
9d0d65be | 108 | TCanvas *c1=(TCanvas*)gROOT->FindObject("c1"); |
109 | if (!c1) { | |
110 | c1=new TCanvas(); | |
111 | } | |
e23730c7 | 112 | |
9d0d65be | 113 | if (hm->GetEntries()>100) hm->Fit("gaus","","",1.11,1.12); |
114 | else hm->Draw(); | |
e23730c7 | 115 | |
9d0d65be | 116 | c1->Update(); |
e23730c7 | 117 | |
118 | return rc; | |
119 | } |