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0717295b | 1 | //******************************************************************** |
2 | // Example (very naive for the moment) of using the ESD classes | |
42345b19 | 3 | // It demonstrates the idea of the "combined PID". |
4 | // Origin: Iouri Belikov, CERN, Jouri.Belikov@cern.ch | |
0717295b | 5 | //******************************************************************** |
6 | ||
7 | #if !defined( __CINT__) || defined(__MAKECINT__) | |
4fa1e629 | 8 | #include <TMath.h> |
9 | #include <TError.h> | |
0717295b | 10 | #include <Riostream.h> |
4fa1e629 | 11 | #include <TH1F.h> |
12 | #include <TH2F.h> | |
13 | #include <TParticle.h> | |
14 | #include <TCanvas.h> | |
15 | #include <TBenchmark.h> | |
8b462fd8 | 16 | #include <TFile.h> |
17 | #include <TTree.h> | |
4fa1e629 | 18 | #include <TROOT.h> |
19 | ||
20 | #include <AliStack.h> | |
21 | #include <AliRunLoader.h> | |
22 | #include <AliRun.h> | |
23 | #include <AliESD.h> | |
0717295b | 24 | #endif |
25 | ||
26 | extern AliRun *gAlice; | |
4fa1e629 | 27 | extern TBenchmark *gBenchmark; |
42345b19 | 28 | extern TROOT *gROOT; |
0717295b | 29 | |
4fa1e629 | 30 | static Int_t allpisel=0; |
31 | static Int_t allkasel=0; | |
32 | static Int_t allprsel=0; | |
33 | static Int_t allnsel=0; | |
34 | ||
3f7a17bb | 35 | Int_t AliESDComparison(const Char_t *dir=".") { |
4fa1e629 | 36 | gBenchmark->Start("AliESDComparison"); |
37 | ||
38 | ::Info("AliESDComparison.C","Doing comparison..."); | |
39 | ||
40 | Double_t pi=0.2,pa=3; | |
f2eae663 | 41 | |
42345b19 | 42 | TH2F *tpcHist=(TH2F*)gROOT->FindObject("tpcHist"); |
43 | if (!tpcHist) | |
f2eae663 | 44 | tpcHist=new TH2F("tpcHist","TPC dE/dX vs momentum",100,pi,pa,100,0.,300.); |
0717295b | 45 | tpcHist->SetXTitle("p (GeV/c)"); tpcHist->SetYTitle("dE/dx (Arb. Units)"); |
42345b19 | 46 | tpcHist->SetMarkerStyle(8); |
47 | tpcHist->SetMarkerSize(0.3); | |
0717295b | 48 | |
42345b19 | 49 | const Char_t *hname[]={ |
50 | "piG","piR","piF","piGood","piFake", | |
51 | "kaG","kaR","kaF","kaGood","kaFake", | |
52 | "prG","prR","prF","prGood","prFake" | |
53 | }; | |
54 | Int_t nh=sizeof(hname)/sizeof(const Char_t *); | |
55 | TH1F **hprt=new TH1F*[nh]; | |
56 | ||
57 | for (Int_t i=0; i<nh; i++) { | |
58 | hprt[i]=(TH1F*)gROOT->FindObject(hname[i]); | |
f2eae663 | 59 | if (hprt[i]==0) {hprt[i]=new TH1F(hname[i],"",20,pi,pa);hprt[i]->Sumw2();} |
42345b19 | 60 | } |
61 | TH1F *piG=hprt[0]; | |
62 | TH1F *piR=hprt[1]; | |
63 | TH1F *piF=hprt[2]; | |
64 | TH1F *piGood=hprt[3]; | |
65 | piGood->SetTitle("Combined PID for pions"); | |
66 | piGood->SetLineColor(4); piGood->SetXTitle("p (GeV/c)"); | |
67 | TH1F *piFake=hprt[4]; | |
68 | piFake->SetLineColor(2); | |
69 | TH1F *kaG=hprt[5]; | |
70 | TH1F *kaR=hprt[6]; | |
71 | TH1F *kaF=hprt[7]; | |
72 | TH1F *kaGood=hprt[8]; | |
73 | kaGood->SetTitle("Combined PID for kaons"); | |
74 | kaGood->SetLineColor(4); kaGood->SetXTitle("p (GeV/c)"); | |
75 | TH1F *kaFake=hprt[9]; | |
76 | kaFake->SetLineColor(2); | |
77 | TH1F *prG=hprt[10]; | |
78 | TH1F *prR=hprt[11]; | |
79 | TH1F *prF=hprt[12]; | |
80 | TH1F *prGood=hprt[13]; | |
81 | prGood->SetTitle("Combined PID for protons"); | |
82 | prGood->SetLineColor(4); prGood->SetXTitle("p (GeV/c)"); | |
83 | TH1F *prFake=hprt[14]; | |
84 | prFake->SetLineColor(2); | |
85 | ||
86 | delete[] hprt; | |
87 | ||
88 | Char_t fname[100]; | |
0717295b | 89 | |
90 | if (gAlice) { | |
91 | delete gAlice->GetRunLoader(); | |
92 | delete gAlice; | |
93 | gAlice=0; | |
94 | } | |
42345b19 | 95 | sprintf(fname,"%s/galice.root",dir); |
96 | AliRunLoader *rl = AliRunLoader::Open(fname); | |
0717295b | 97 | if (rl == 0x0) { |
4fa1e629 | 98 | ::Error("AliESDComparison.C","Can not open session !"); |
0717295b | 99 | return 1; |
100 | } | |
101 | if (rl->LoadgAlice()) { | |
4fa1e629 | 102 | ::Error("AliESDComparison.C","LoadgAlice returned error !"); |
0717295b | 103 | delete rl; |
104 | return 1; | |
105 | } | |
106 | if (rl->LoadHeader()) { | |
4fa1e629 | 107 | ::Error("AliESDComparison.C","LoadHeader returned error !"); |
0717295b | 108 | delete rl; |
109 | return 1; | |
110 | } | |
111 | rl->LoadKinematics(); | |
0717295b | 112 | |
42345b19 | 113 | sprintf(fname,"%s/AliESDs.root",dir); |
114 | TFile *ef=TFile::Open(fname); | |
4fa1e629 | 115 | if (!ef || !ef->IsOpen()) { |
116 | ::Error("AliESDComparison.C","Can't AliESDs.root !"); | |
117 | delete rl; | |
118 | return 1; | |
119 | } | |
8b462fd8 | 120 | AliESD* event = new AliESD; |
121 | TTree* tree = (TTree*) ef->Get("esdTree"); | |
122 | if (!tree) { | |
123 | ::Error("AliESDComparison.C", "no ESD tree found"); | |
124 | delete rl; | |
125 | return 1; | |
126 | } | |
127 | tree->SetBranchAddress("ESD", &event); | |
0717295b | 128 | |
129 | //****** Tentative particle type "concentrations" | |
130 | Double_t c[5]={0.01, 0.01, 0.85, 0.10, 0.05}; | |
131 | ||
132 | //******* The loop over events | |
4fa1e629 | 133 | Int_t e=0; |
8b462fd8 | 134 | while (tree->GetEvent(e)) { |
4fa1e629 | 135 | cout<<endl<<endl<<"********* Processing event number: "<<e<<"*******\n"; |
0717295b | 136 | |
8b462fd8 | 137 | rl->GetEvent(e); |
4fa1e629 | 138 | |
139 | e++; | |
0717295b | 140 | |
4fa1e629 | 141 | Int_t ntrk=event->GetNumberOfTracks(); |
142 | cerr<<"Number of ESD tracks : "<<ntrk<<endl; | |
0717295b | 143 | |
4fa1e629 | 144 | Int_t pisel=0,kasel=0,prsel=0,nsel=0; |
0717295b | 145 | |
4fa1e629 | 146 | AliStack *stack = rl->Stack(); |
0717295b | 147 | |
4fa1e629 | 148 | while (ntrk--) { |
149 | AliESDtrack *t=event->GetTrack(ntrk); | |
0717295b | 150 | |
4fa1e629 | 151 | UInt_t status=AliESDtrack::kESDpid; |
152 | status|=AliESDtrack::kITSpid; | |
153 | status|=AliESDtrack::kTPCpid; | |
154 | status|=AliESDtrack::kTOFpid; | |
0717295b | 155 | |
4fa1e629 | 156 | if ((t->GetStatus()&status) == status) { |
157 | nsel++; | |
f2eae663 | 158 | |
4fa1e629 | 159 | Double_t p=t->GetP(); |
160 | Double_t dedx=t->GetTPCsignal(); | |
161 | tpcHist->Fill(p,dedx,1); | |
0717295b | 162 | |
4fa1e629 | 163 | Int_t lab=TMath::Abs(t->GetLabel()); |
164 | TParticle *part=stack->Particle(lab); | |
165 | Int_t code=part->GetPdgCode(); | |
0717295b | 166 | |
4fa1e629 | 167 | Double_t r[10]; t->GetESDpid(r); |
0717295b | 168 | |
4fa1e629 | 169 | Double_t rcc=0.; |
170 | Int_t i; | |
171 | for (i=0; i<AliESDtrack::kSPECIES; i++) rcc+=(c[i]*r[i]); | |
172 | if (rcc==0.) continue; | |
0717295b | 173 | |
4fa1e629 | 174 | //Here we apply Bayes' formula |
175 | Double_t w[10]; | |
176 | for (i=0; i<AliESDtrack::kSPECIES; i++) w[i]=c[i]*r[i]/rcc; | |
0717295b | 177 | |
4fa1e629 | 178 | if (TMath::Abs(code)==2212) prR->Fill(p); |
179 | if (w[4]>w[3] && w[4]>w[2] && w[4]>w[1] && w[4]>w[0]) {//proton | |
180 | prsel++; | |
181 | prG->Fill(p); | |
182 | if (TMath::Abs(code)!=2212) prF->Fill(p); | |
183 | } | |
0717295b | 184 | |
4fa1e629 | 185 | if (TMath::Abs(code)==321) kaR->Fill(p); |
186 | if (w[3]>w[4] && w[3]>w[2] && w[3]>w[1] && w[3]>w[0]) {//kaon | |
187 | kasel++; | |
188 | kaG->Fill(p); | |
189 | if (TMath::Abs(code)!=321) kaF->Fill(p); | |
190 | } | |
0717295b | 191 | |
4fa1e629 | 192 | if (TMath::Abs(code)==211) piR->Fill(p); |
193 | if (w[2]>w[3] && w[2]>w[4] && w[2]>w[1] && w[2]>w[0]) {//pion | |
194 | pisel++; | |
195 | piG->Fill(p); | |
196 | if (TMath::Abs(code)!=211) piF->Fill(p); | |
197 | } | |
198 | } | |
199 | } | |
4fa1e629 | 200 | cout<<"Number of selected ESD tracks : "<<nsel<<endl; |
201 | cout<<"Number of selected pion ESD tracks : "<<pisel<<endl; | |
202 | cout<<"Number of selected kaon ESD tracks : "<<kasel<<endl; | |
203 | cout<<"Number of selected proton ESD tracks : "<<prsel<<endl; | |
0717295b | 204 | |
4fa1e629 | 205 | allnsel+=nsel; allpisel+=pisel; allkasel+=kasel; allprsel+=prsel; |
f2eae663 | 206 | |
4fa1e629 | 207 | } // ***** End of the loop over events |
0717295b | 208 | |
8b462fd8 | 209 | delete event; |
4fa1e629 | 210 | ef->Close(); |
0717295b | 211 | |
42345b19 | 212 | TCanvas *c1=(TCanvas*)gROOT->FindObject("c1"); |
4fa1e629 | 213 | if (!c1) { |
214 | c1=new TCanvas("c1","",0,0,600,1200); | |
215 | c1->Divide(1,4); | |
216 | } | |
0717295b | 217 | |
218 | c1->cd(1); | |
219 | tpcHist->Draw(); | |
220 | ||
221 | c1->cd(2); | |
42345b19 | 222 | //piG->Sumw2(); piF->Sumw2(); piR->Sumw2(); |
f2eae663 | 223 | piGood->Add(piG,piF,1,-1); |
224 | piGood->Divide(piGood,piR,1,1,"b"); | |
0717295b | 225 | piFake->Divide(piF,piG,1,1,"b"); |
226 | piGood->Draw("hist"); | |
227 | piFake->Draw("same"); | |
228 | ||
229 | c1->cd(3); | |
42345b19 | 230 | //kaG->Sumw2(); kaF->Sumw2(); kaR->Sumw2(); |
f2eae663 | 231 | kaGood->Add(kaG,kaF,1,-1); |
232 | kaGood->Divide(kaGood,kaR,1,1,"b"); | |
0717295b | 233 | kaFake->Divide(kaF,kaG,1,1,"b"); |
234 | kaGood->Draw("hist"); | |
235 | kaFake->Draw("same"); | |
236 | ||
237 | c1->cd(4); | |
42345b19 | 238 | //prG->Sumw2(); prF->Sumw2(); prR->Sumw2(); |
f2eae663 | 239 | prGood->Add(prG,prF,1,-1); |
240 | prGood->Divide(prGood,prR,1,1,"b"); | |
0717295b | 241 | prFake->Divide(prF,prG,1,1,"b"); |
242 | prGood->Draw("hist"); | |
243 | prFake->Draw("same"); | |
244 | ||
4fa1e629 | 245 | c1->Update(); |
246 | ||
247 | cout<<endl; | |
248 | cout<<endl; | |
249 | e=(Int_t)piR->GetEntries(); | |
250 | Int_t o=(Int_t)piG->GetEntries(); | |
251 | if (e*o) cout<<"Efficiency (contamination) for pions : "<< | |
252 | piGood->GetEntries()/e<<'('<<piF->GetEntries()/o<<')'<<endl; | |
253 | e=(Int_t)kaR->GetEntries(); | |
254 | o=(Int_t)kaG->GetEntries(); | |
255 | if (e*o) cout<<"Efficiency (contamination) for kaons : "<< | |
256 | kaGood->GetEntries()/e<<'('<<kaF->GetEntries()/o<<')'<<endl; | |
257 | e=(Int_t)prR->GetEntries(); | |
258 | o=(Int_t)prG->GetEntries(); | |
259 | if (e*o) cout<<"Efficiency (contamination) for protons : "<< | |
260 | prGood->GetEntries()/e<<'('<<prF->GetEntries()/o<<')'<<endl; | |
261 | cout<<endl; | |
262 | ||
263 | cout<<"Total number of selected ESD tracks : "<<allnsel<<endl; | |
264 | cout<<"Total number of selected pion ESD tracks : "<<allpisel<<endl; | |
265 | cout<<"Total number of selected kaon ESD tracks : "<<allkasel<<endl; | |
266 | cout<<"Total number of selected proton ESD tracks : "<<allprsel<<endl; | |
267 | ||
0717295b | 268 | ef->Close(); |
3f7a17bb | 269 | TFile fc("AliESDComparison.root","RECREATE"); |
270 | c1->Write(); | |
271 | fc.Close(); | |
0717295b | 272 | |
4fa1e629 | 273 | gBenchmark->Stop("AliESDComparison"); |
274 | gBenchmark->Show("AliESDComparison"); | |
0717295b | 275 | |
4fa1e629 | 276 | delete rl; |
277 | return 0; | |
0717295b | 278 | } |