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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> | |
16 | #include <TKey.h> | |
17 | #include <TROOT.h> | |
18 | ||
19 | #include <AliStack.h> | |
20 | #include <AliRunLoader.h> | |
21 | #include <AliRun.h> | |
22 | #include <AliESD.h> | |
0717295b | 23 | #endif |
24 | ||
25 | extern AliRun *gAlice; | |
4fa1e629 | 26 | extern TBenchmark *gBenchmark; |
42345b19 | 27 | extern TROOT *gROOT; |
0717295b | 28 | |
4fa1e629 | 29 | static Int_t allpisel=0; |
30 | static Int_t allkasel=0; | |
31 | static Int_t allprsel=0; | |
32 | static Int_t allnsel=0; | |
33 | ||
3f7a17bb | 34 | Int_t AliESDComparison(const Char_t *dir=".") { |
4fa1e629 | 35 | gBenchmark->Start("AliESDComparison"); |
36 | ||
37 | ::Info("AliESDComparison.C","Doing comparison..."); | |
38 | ||
39 | Double_t pi=0.2,pa=3; | |
f2eae663 | 40 | |
42345b19 | 41 | TH2F *tpcHist=(TH2F*)gROOT->FindObject("tpcHist"); |
42 | if (!tpcHist) | |
f2eae663 | 43 | tpcHist=new TH2F("tpcHist","TPC dE/dX vs momentum",100,pi,pa,100,0.,300.); |
0717295b | 44 | tpcHist->SetXTitle("p (GeV/c)"); tpcHist->SetYTitle("dE/dx (Arb. Units)"); |
42345b19 | 45 | tpcHist->SetMarkerStyle(8); |
46 | tpcHist->SetMarkerSize(0.3); | |
0717295b | 47 | |
42345b19 | 48 | const Char_t *hname[]={ |
49 | "piG","piR","piF","piGood","piFake", | |
50 | "kaG","kaR","kaF","kaGood","kaFake", | |
51 | "prG","prR","prF","prGood","prFake" | |
52 | }; | |
53 | Int_t nh=sizeof(hname)/sizeof(const Char_t *); | |
54 | TH1F **hprt=new TH1F*[nh]; | |
55 | ||
56 | for (Int_t i=0; i<nh; i++) { | |
57 | hprt[i]=(TH1F*)gROOT->FindObject(hname[i]); | |
f2eae663 | 58 | if (hprt[i]==0) {hprt[i]=new TH1F(hname[i],"",20,pi,pa);hprt[i]->Sumw2();} |
42345b19 | 59 | } |
60 | TH1F *piG=hprt[0]; | |
61 | TH1F *piR=hprt[1]; | |
62 | TH1F *piF=hprt[2]; | |
63 | TH1F *piGood=hprt[3]; | |
64 | piGood->SetTitle("Combined PID for pions"); | |
65 | piGood->SetLineColor(4); piGood->SetXTitle("p (GeV/c)"); | |
66 | TH1F *piFake=hprt[4]; | |
67 | piFake->SetLineColor(2); | |
68 | TH1F *kaG=hprt[5]; | |
69 | TH1F *kaR=hprt[6]; | |
70 | TH1F *kaF=hprt[7]; | |
71 | TH1F *kaGood=hprt[8]; | |
72 | kaGood->SetTitle("Combined PID for kaons"); | |
73 | kaGood->SetLineColor(4); kaGood->SetXTitle("p (GeV/c)"); | |
74 | TH1F *kaFake=hprt[9]; | |
75 | kaFake->SetLineColor(2); | |
76 | TH1F *prG=hprt[10]; | |
77 | TH1F *prR=hprt[11]; | |
78 | TH1F *prF=hprt[12]; | |
79 | TH1F *prGood=hprt[13]; | |
80 | prGood->SetTitle("Combined PID for protons"); | |
81 | prGood->SetLineColor(4); prGood->SetXTitle("p (GeV/c)"); | |
82 | TH1F *prFake=hprt[14]; | |
83 | prFake->SetLineColor(2); | |
84 | ||
85 | delete[] hprt; | |
86 | ||
87 | Char_t fname[100]; | |
0717295b | 88 | |
89 | if (gAlice) { | |
90 | delete gAlice->GetRunLoader(); | |
91 | delete gAlice; | |
92 | gAlice=0; | |
93 | } | |
42345b19 | 94 | sprintf(fname,"%s/galice.root",dir); |
95 | AliRunLoader *rl = AliRunLoader::Open(fname); | |
0717295b | 96 | if (rl == 0x0) { |
4fa1e629 | 97 | ::Error("AliESDComparison.C","Can not open session !"); |
0717295b | 98 | return 1; |
99 | } | |
100 | if (rl->LoadgAlice()) { | |
4fa1e629 | 101 | ::Error("AliESDComparison.C","LoadgAlice returned error !"); |
0717295b | 102 | delete rl; |
103 | return 1; | |
104 | } | |
105 | if (rl->LoadHeader()) { | |
4fa1e629 | 106 | ::Error("AliESDComparison.C","LoadHeader returned error !"); |
0717295b | 107 | delete rl; |
108 | return 1; | |
109 | } | |
110 | rl->LoadKinematics(); | |
0717295b | 111 | |
42345b19 | 112 | sprintf(fname,"%s/AliESDs.root",dir); |
113 | TFile *ef=TFile::Open(fname); | |
4fa1e629 | 114 | if (!ef || !ef->IsOpen()) { |
115 | ::Error("AliESDComparison.C","Can't AliESDs.root !"); | |
116 | delete rl; | |
117 | return 1; | |
118 | } | |
0717295b | 119 | TKey *key=0; |
120 | TIter next(ef->GetListOfKeys()); | |
121 | ||
122 | //****** Tentative particle type "concentrations" | |
123 | Double_t c[5]={0.01, 0.01, 0.85, 0.10, 0.05}; | |
124 | ||
125 | //******* The loop over events | |
4fa1e629 | 126 | Int_t e=0; |
0717295b | 127 | while ((key=(TKey*)next())!=0) { |
4fa1e629 | 128 | cout<<endl<<endl<<"********* Processing event number: "<<e<<"*******\n"; |
0717295b | 129 | |
4fa1e629 | 130 | rl->GetEvent(e); ef->cd(); |
131 | ||
132 | e++; | |
0717295b | 133 | |
4fa1e629 | 134 | AliESD *event=(AliESD*)key->ReadObj(); |
f2eae663 | 135 | |
4fa1e629 | 136 | Int_t ntrk=event->GetNumberOfTracks(); |
137 | cerr<<"Number of ESD tracks : "<<ntrk<<endl; | |
0717295b | 138 | |
4fa1e629 | 139 | Int_t pisel=0,kasel=0,prsel=0,nsel=0; |
0717295b | 140 | |
4fa1e629 | 141 | AliStack *stack = rl->Stack(); |
0717295b | 142 | |
4fa1e629 | 143 | while (ntrk--) { |
144 | AliESDtrack *t=event->GetTrack(ntrk); | |
0717295b | 145 | |
4fa1e629 | 146 | UInt_t status=AliESDtrack::kESDpid; |
147 | status|=AliESDtrack::kITSpid; | |
148 | status|=AliESDtrack::kTPCpid; | |
149 | status|=AliESDtrack::kTOFpid; | |
0717295b | 150 | |
4fa1e629 | 151 | if ((t->GetStatus()&status) == status) { |
152 | nsel++; | |
f2eae663 | 153 | |
4fa1e629 | 154 | Double_t p=t->GetP(); |
155 | Double_t dedx=t->GetTPCsignal(); | |
156 | tpcHist->Fill(p,dedx,1); | |
0717295b | 157 | |
4fa1e629 | 158 | Int_t lab=TMath::Abs(t->GetLabel()); |
159 | TParticle *part=stack->Particle(lab); | |
160 | Int_t code=part->GetPdgCode(); | |
0717295b | 161 | |
4fa1e629 | 162 | Double_t r[10]; t->GetESDpid(r); |
0717295b | 163 | |
4fa1e629 | 164 | Double_t rcc=0.; |
165 | Int_t i; | |
166 | for (i=0; i<AliESDtrack::kSPECIES; i++) rcc+=(c[i]*r[i]); | |
167 | if (rcc==0.) continue; | |
0717295b | 168 | |
4fa1e629 | 169 | //Here we apply Bayes' formula |
170 | Double_t w[10]; | |
171 | for (i=0; i<AliESDtrack::kSPECIES; i++) w[i]=c[i]*r[i]/rcc; | |
0717295b | 172 | |
4fa1e629 | 173 | if (TMath::Abs(code)==2212) prR->Fill(p); |
174 | if (w[4]>w[3] && w[4]>w[2] && w[4]>w[1] && w[4]>w[0]) {//proton | |
175 | prsel++; | |
176 | prG->Fill(p); | |
177 | if (TMath::Abs(code)!=2212) prF->Fill(p); | |
178 | } | |
0717295b | 179 | |
4fa1e629 | 180 | if (TMath::Abs(code)==321) kaR->Fill(p); |
181 | if (w[3]>w[4] && w[3]>w[2] && w[3]>w[1] && w[3]>w[0]) {//kaon | |
182 | kasel++; | |
183 | kaG->Fill(p); | |
184 | if (TMath::Abs(code)!=321) kaF->Fill(p); | |
185 | } | |
0717295b | 186 | |
4fa1e629 | 187 | if (TMath::Abs(code)==211) piR->Fill(p); |
188 | if (w[2]>w[3] && w[2]>w[4] && w[2]>w[1] && w[2]>w[0]) {//pion | |
189 | pisel++; | |
190 | piG->Fill(p); | |
191 | if (TMath::Abs(code)!=211) piF->Fill(p); | |
192 | } | |
193 | } | |
194 | } | |
195 | delete event; | |
196 | cout<<"Number of selected ESD tracks : "<<nsel<<endl; | |
197 | cout<<"Number of selected pion ESD tracks : "<<pisel<<endl; | |
198 | cout<<"Number of selected kaon ESD tracks : "<<kasel<<endl; | |
199 | cout<<"Number of selected proton ESD tracks : "<<prsel<<endl; | |
0717295b | 200 | |
4fa1e629 | 201 | allnsel+=nsel; allpisel+=pisel; allkasel+=kasel; allprsel+=prsel; |
f2eae663 | 202 | |
4fa1e629 | 203 | } // ***** End of the loop over events |
0717295b | 204 | |
4fa1e629 | 205 | ef->Close(); |
0717295b | 206 | |
42345b19 | 207 | TCanvas *c1=(TCanvas*)gROOT->FindObject("c1"); |
4fa1e629 | 208 | if (!c1) { |
209 | c1=new TCanvas("c1","",0,0,600,1200); | |
210 | c1->Divide(1,4); | |
211 | } | |
0717295b | 212 | |
213 | c1->cd(1); | |
214 | tpcHist->Draw(); | |
215 | ||
216 | c1->cd(2); | |
42345b19 | 217 | //piG->Sumw2(); piF->Sumw2(); piR->Sumw2(); |
f2eae663 | 218 | piGood->Add(piG,piF,1,-1); |
219 | piGood->Divide(piGood,piR,1,1,"b"); | |
0717295b | 220 | piFake->Divide(piF,piG,1,1,"b"); |
221 | piGood->Draw("hist"); | |
222 | piFake->Draw("same"); | |
223 | ||
224 | c1->cd(3); | |
42345b19 | 225 | //kaG->Sumw2(); kaF->Sumw2(); kaR->Sumw2(); |
f2eae663 | 226 | kaGood->Add(kaG,kaF,1,-1); |
227 | kaGood->Divide(kaGood,kaR,1,1,"b"); | |
0717295b | 228 | kaFake->Divide(kaF,kaG,1,1,"b"); |
229 | kaGood->Draw("hist"); | |
230 | kaFake->Draw("same"); | |
231 | ||
232 | c1->cd(4); | |
42345b19 | 233 | //prG->Sumw2(); prF->Sumw2(); prR->Sumw2(); |
f2eae663 | 234 | prGood->Add(prG,prF,1,-1); |
235 | prGood->Divide(prGood,prR,1,1,"b"); | |
0717295b | 236 | prFake->Divide(prF,prG,1,1,"b"); |
237 | prGood->Draw("hist"); | |
238 | prFake->Draw("same"); | |
239 | ||
4fa1e629 | 240 | c1->Update(); |
241 | ||
242 | cout<<endl; | |
243 | cout<<endl; | |
244 | e=(Int_t)piR->GetEntries(); | |
245 | Int_t o=(Int_t)piG->GetEntries(); | |
246 | if (e*o) cout<<"Efficiency (contamination) for pions : "<< | |
247 | piGood->GetEntries()/e<<'('<<piF->GetEntries()/o<<')'<<endl; | |
248 | e=(Int_t)kaR->GetEntries(); | |
249 | o=(Int_t)kaG->GetEntries(); | |
250 | if (e*o) cout<<"Efficiency (contamination) for kaons : "<< | |
251 | kaGood->GetEntries()/e<<'('<<kaF->GetEntries()/o<<')'<<endl; | |
252 | e=(Int_t)prR->GetEntries(); | |
253 | o=(Int_t)prG->GetEntries(); | |
254 | if (e*o) cout<<"Efficiency (contamination) for protons : "<< | |
255 | prGood->GetEntries()/e<<'('<<prF->GetEntries()/o<<')'<<endl; | |
256 | cout<<endl; | |
257 | ||
258 | cout<<"Total number of selected ESD tracks : "<<allnsel<<endl; | |
259 | cout<<"Total number of selected pion ESD tracks : "<<allpisel<<endl; | |
260 | cout<<"Total number of selected kaon ESD tracks : "<<allkasel<<endl; | |
261 | cout<<"Total number of selected proton ESD tracks : "<<allprsel<<endl; | |
262 | ||
0717295b | 263 | ef->Close(); |
3f7a17bb | 264 | TFile fc("AliESDComparison.root","RECREATE"); |
265 | c1->Write(); | |
266 | fc.Close(); | |
0717295b | 267 | |
4fa1e629 | 268 | gBenchmark->Stop("AliESDComparison"); |
269 | gBenchmark->Show("AliESDComparison"); | |
0717295b | 270 | |
4fa1e629 | 271 | delete rl; |
272 | return 0; | |
0717295b | 273 | } |