1 void AliD0toKpiPlots(const Char_t *inName="AliD0toKpi.root",
2 const Char_t *outName="D0histograms.root") {
3 //--------------------------------------------------------------------------
4 // This macro histograms many variables of D0->Kpi candidates
6 // Andrea Dainese, andrea.dainese@lnl.infn.it
7 //--------------------------------------------------------------------------
9 gSystem->Load("libAOD.so");
10 gSystem->Load("libPWG3base.so");
13 Double_t D0Cuts[9] = {0.1, // mass [GeV]
14 1000000., // dca [micron]
18 100000., // d0K upper [micron]
19 100000., // d0Pi upper [micron]
20 10000000000., // d0d0 [micron^2]
21 -1.1}; // cosThetaPointing
23 // number of events (for normalization)
24 Bool_t normalize = kFALSE;
30 TH1F *hptK = new TH1F("hptK","\"K\" p_{t} distribution",50,0,10);
31 hptK->SetXTitle("p_{t} [GeV]");
33 TH1F *hptPi = new TH1F("hptPi","\"#pi\" p_{t} distribution",50,0,10);
34 hptPi->SetXTitle("p_{t} [GeV]");
36 TH1F *hDCA = new TH1F("hDCA","DCA",50,0,1000);
37 hDCA->SetXTitle("dca [#mu m]");
39 TH1F *hptD0 = new TH1F("hptD0","D^{0} p_{t} distribution",40,0,40);
40 hptD0->SetXTitle("p_{t} [GeV]");
42 TH1F *hyD0 = new TH1F("hyD0","D^{0} rapidity distribution",50,-2,2);
45 TH1F *hCPtaD0 = new TH1F("hCPtaD0","cosine of pointing angle distribution",100,-1,1);
46 hCPtaD0->SetXTitle("cos #theta_{point}");
48 TH1F *hCPtaXY = new TH1F("hCPtaXY","cosine of pointing angle in (x,y) plane",100,-1,1);
49 hCPtaXY->SetXTitle("cos #theta_{point}");
51 TH1F *hCts = new TH1F("hCts","cosine of decay angle",50,-1.2,1.2);
52 hCts->SetXTitle("cos #theta^{*}");
54 TH2F *hCtsVsPtK = new TH2F("hCtsVsPtK","cosine of decay angle VS \"K\" p_{t}",50,0,5,50,-1,1);
55 hCtsVsPtK->SetYTitle("cos #theta^{*}");
56 hCtsVsPtK->SetXTitle("p_{t} [GeV]");
58 TH1F *hd0d0 = new TH1F("hd0d0","Product of the impact parameters",100,-100000,100000);
59 hd0d0->SetXTitle("d_{0}^{K} #times d_{0}^{#pi} [#mu m^{2}]");
61 TH1F *hd0K = new TH1F("hd0K","Impact parameter of \"K\"",100,-5000,5000);
62 hd0K->SetXTitle("d_{0}^{K} [#mu m]");
64 TH1F *hd0Pi = new TH1F("hd0Pi","Impact parameter of \"#pi\"",100,-5000,5000);
65 hd0Pi->SetXTitle("d_{0}^{#pi} [#mu m]");
67 TH2F *hCPtaVsd0d0 = new TH2F("hCPtaVsd0d0","cos #theta_{point} vs d_{0}^{K} #times d_{0}^{#pi}",100,-100000,100000,100,-1,1);
68 hCPtaVsd0d0->SetXTitle("d_{0}^{K} #times d_{0}^{#pi} [#mu m^{2}]");
69 hCPtaVsd0d0->SetYTitle("cos #theta_{point}");
71 TH2F *hCPtaVsd0d0zoom = new TH2F("hCPtaVsd0d0zoom","cos #theta_{point} vs d_{0}^{K} #times d_{0}^{#pi}",100,-100000,0,100,.9,1);
72 hCPtaVsd0d0zoom->SetXTitle("d_{0}^{K} #times d_{0}^{#pi} [#mu m^{2}]");
73 hCPtaVsd0d0zoom->SetYTitle("cos #theta_{point}");
75 TH2F *hd0d0VSptD0 = new TH2F("hd0d0VSptD0","d_{0}^{K} #times d_{0}^{#pi} VS D^{0} p_{t}",50,0,25,100,-120000,120000);
76 hd0d0VSptD0->SetYTitle("d_{0}^{K} #times d_{0}^{#pi} [#mu m^{2}]");
77 hd0d0VSptD0->SetXTitle("D^{0} p_{t} [GeV]");
79 TH1F *hMass = new TH1F("hMass","Invariant mass distribution",50,1.765,1.965);
80 hMass->SetXTitle("M[K,#pi] [GeV]");
82 TH2F *hArm = new TH2F("hArm","Armenteros plot",50,-2,2,50,0,1);
83 hArm->SetXTitle("#alpha");
84 hArm->SetYTitle("q_{t}");
86 // open input file and get tree
87 TFile *inFile = TFile::Open(inName);
89 TTree *treeD0 = (TTree*)inFile->Get("TreeD0");
91 treeD0->SetBranchAddress("D0toKpi",&D);
92 Int_t entries = (Int_t)treeD0->GetEntries();
94 printf("+++\n+++ Number of D0 in tree: %d\n+++\n",entries);
96 Double_t MD0,MD0bar,ctsD0,ctsD0bar,ctsPiD0,ctsPiD0bar;
97 Double_t WgtD0,WgtD0bar;
98 Double_t sampleABC=0.;
99 Int_t okD0=0,okD0bar=0;
104 for(Int_t i=0; i<entries; i++) {
105 if(i%10000==0) printf(" candidate %d of %d\n",i,entries);
107 // get event from tree
109 //--- select the PID strategy & compute weights
110 // D->ApplyPID("TOFparam_PbPb");
112 // get weights for the three samples A+B+C
113 // D->GetWgts(WgtD0,WgtD0bar,"ABC");
114 WgtD0 = 1.; WgtD0bar = 1.;
116 // normalize to 1 event
117 if(normalize) { WgtD0 /= events; WgtD0bar /= events; }
119 // check if candidate passes selection (as D0 or D0bar)
120 D->Select(D0Cuts,okD0,okD0bar);
122 // set weights to 0 if the candidate doesn't pass selection
124 if(!okD0bar) WgtD0bar=0.;
125 if(okD0 || okD0bar) nSel++;
127 // count selected candidates
128 sampleABC += WgtD0 + WgtD0bar;
130 // inv mass and cosThetaStar
131 D->InvMass(MD0,MD0bar);
132 D->CosThetaStar(ctsD0,ctsD0bar);
135 hptK->Fill(D->PtChild(1),WgtD0);
136 hptK->Fill(D->PtChild(0),WgtD0bar);
137 hptPi->Fill(D->PtChild(0),WgtD0);
138 hptPi->Fill(D->PtChild(1),WgtD0bar);
139 hd0K->Fill(D->Getd0Child(1),WgtD0);
140 hd0K->Fill(D->Getd0Child(0),WgtD0bar);
141 hd0Pi->Fill(D->Getd0Child(0),WgtD0);
142 hd0Pi->Fill(D->Getd0Child(1),WgtD0bar);
143 hMass->Fill(MD0,WgtD0);
144 hMass->Fill(MD0bar,WgtD0bar);
145 hCts->Fill(ctsD0,WgtD0);
146 hCts->Fill(ctsD0bar,WgtD0bar);
147 hCtsVsPtK->Fill(D->PtChild(1),ctsD0,WgtD0);
148 hCtsVsPtK->Fill(D->PtChild(0),ctsD0bar,WgtD0bar);
149 hDCA->Fill(D->GetDCA(),WgtD0+WgtD0bar);
150 hptD0->Fill(D->Pt(),WgtD0+WgtD0bar);
151 hyD0->Fill(D->Rapidity(),WgtD0+WgtD0bar);
152 hd0d0->Fill(D->ProdImpParams(),WgtD0+WgtD0bar);
153 hCPtaD0->Fill(D->CosPointing(),WgtD0+WgtD0bar);
154 hCPtaXY->Fill(D->CosPointingXY(),WgtD0+WgtD0bar);
155 hCPtaVsd0d0->Fill(D->ProdImpParams(),D->CosPointing(),WgtD0+WgtD0bar);
156 hd0d0VSptD0->Fill(D->Pt(),D->ProdImpParams(),WgtD0+WgtD0bar);
157 hCPtaVsd0d0zoom->Fill(D->ProdImpParams(),D->CosPointing(),WgtD0+WgtD0bar);
158 hArm->Fill(D->Alpha(),D->Qt(),WgtD0+WgtD0bar);
161 } // end loop on D0 candidates
165 printf("\n\n --- Total number of candidates passing selection: %d\n\n --- Sum of weights sample A+B+C: %f\n\n",nSel,sampleABC);
168 TCanvas *c1 = new TCanvas("c1","pt K & pi",0,0,700,700);
173 TCanvas *c2 = new TCanvas("c2","pt D0",0,0,700,700);
177 TCanvas *c3 = new TCanvas("c3","rapidity D0",0,0,700,700);
180 TCanvas *c4 = new TCanvas("c4","pointing angle",0,0,700,700);
183 TCanvas *c5 = new TCanvas("c5","d0 x d0",0,0,700,700);
187 TCanvas *c6 = new TCanvas("c6","pointing angle VS d0d0",0,0,700,700);
189 hCPtaVsd0d0->Draw("box");
191 TCanvas *c7 = new TCanvas("c7","mass",0,0,700,700);
194 TCanvas *c8 = new TCanvas("c8","armenteros",0,0,700,700);
197 TCanvas *c9 = new TCanvas("c9","decay angle",0,0,700,700);
200 TCanvas *c10 = new TCanvas("c10","dca",0,0,700,700);
204 TCanvas *c11 = new TCanvas("c11","d0 K & pi",0,0,700,700);
209 // write all histograms to file
210 TFile *outFile = new TFile(outName,"recreate");
216 hCPtaVsd0d0->Write();
217 hd0d0VSptD0->Write();
218 hCPtaVsd0d0zoom->Write();