GetESD.sh becomes runtest.sh
[u/mrichter/AliRoot.git] / ANALYSIS / AliD0toKpiPlots.C
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
5   //
6   //     Andrea Dainese, andrea.dainese@lnl.infn.it
7   //--------------------------------------------------------------------------
8
9   gSystem->Load("libANALYSIS.so");
10
11   // set of cuts
12   Double_t D0Cuts[9] = {0.1,         // mass [GeV]
13                         1000000.,          // dca [micron]
14                         1.1,           // cosThetaStar
15                         0.,           // pT K [GeV/c]
16                         0.,           // pT Pi [GeV/c]    
17                         100000.,       // d0K upper [micron]
18                         100000.,       // d0Pi upper [micron]
19                         10000000000.,            // d0d0 [micron^2]
20                         -1.1};          // cosThetaPointing
21
22   // number of events (for normalization)
23   Bool_t normalize = kFALSE;
24   Double_t  events = 1.;
25
26
27
28   // define histograms
29   TH1F *hptK = new TH1F("hptK","\"K\" p_{t} distribution",50,0,10);
30   hptK->SetXTitle("p_{t} [GeV]");
31
32   TH1F *hptPi = new TH1F("hptPi","\"#pi\" p_{t} distribution",50,0,10);
33   hptPi->SetXTitle("p_{t} [GeV]");
34
35   TH1F *hDCA = new TH1F("hDCA","DCA",50,0,1000);
36   hDCA->SetXTitle("dca [#mu m]");
37
38   TH1F *hptD0 = new TH1F("hptD0","D^{0} p_{t} distribution",40,0,40);
39   hptD0->SetXTitle("p_{t} [GeV]");
40
41   TH1F *hyD0 = new TH1F("hyD0","D^{0} rapidity distribution",50,-2,2);
42   hyD0->SetXTitle("y");
43
44   TH1F *hCPtaD0 = new TH1F("hCPtaD0","cosine of pointing angle distribution",100,-1,1);
45   hCPtaD0->SetXTitle("cos #theta_{point}");
46
47   TH1F *hCPtaXY = new TH1F("hCPtaXY","cosine of pointing angle in (x,y) plane",100,-1,1);
48   hCPtaXY->SetXTitle("cos #theta_{point}");
49
50   TH1F *hCts = new TH1F("hCts","cosine of decay angle",50,-1.2,1.2);
51   hCts->SetXTitle("cos #theta^{*}");
52
53   TH2F *hCtsVsPtK = new TH2F("hCtsVsPtK","cosine of decay angle VS \"K\" p_{t}",50,0,5,50,-1,1);
54   hCtsVsPtK->SetYTitle("cos #theta^{*}");
55   hCtsVsPtK->SetXTitle("p_{t} [GeV]");
56
57   TH1F *hd0d0 = new TH1F("hd0d0","Product of the impact parameters",100,-100000,100000);
58   hd0d0->SetXTitle("d_{0}^{K} #times d_{0}^{#pi} [#mu m^{2}]");
59
60   TH1F *hd0K = new TH1F("hd0K","Impact parameter of \"K\"",100,-5000,5000);
61   hd0K->SetXTitle("d_{0}^{K} [#mu m]");
62
63   TH1F *hd0Pi = new TH1F("hd0Pi","Impact parameter of \"#pi\"",100,-5000,5000);
64   hd0Pi->SetXTitle("d_{0}^{#pi} [#mu m]");
65
66   TH2F *hCPtaVsd0d0 = new TH2F("hCPtaVsd0d0","cos #theta_{point} vs d_{0}^{K} #times d_{0}^{#pi}",100,-100000,100000,100,-1,1);
67   hCPtaVsd0d0->SetXTitle("d_{0}^{K} #times d_{0}^{#pi} [#mu m^{2}]");
68   hCPtaVsd0d0->SetYTitle("cos #theta_{point}");
69
70   TH2F *hCPtaVsd0d0zoom = new TH2F("hCPtaVsd0d0zoom","cos #theta_{point} vs d_{0}^{K} #times d_{0}^{#pi}",100,-100000,0,100,.9,1);
71   hCPtaVsd0d0zoom->SetXTitle("d_{0}^{K} #times d_{0}^{#pi} [#mu m^{2}]");
72   hCPtaVsd0d0zoom->SetYTitle("cos #theta_{point}");
73
74   TH2F *hd0d0VSptD0 = new TH2F("hd0d0VSptD0","d_{0}^{K} #times d_{0}^{#pi} VS D^{0} p_{t}",50,0,25,100,-120000,120000);
75   hd0d0VSptD0->SetYTitle("d_{0}^{K} #times d_{0}^{#pi} [#mu m^{2}]");
76   hd0d0VSptD0->SetXTitle("D^{0} p_{t} [GeV]");
77
78   TH1F *hMass = new TH1F("hMass","Invariant mass distribution",50,1.765,1.965);
79   hMass->SetXTitle("M[K,#pi] [GeV]");
80
81   TH2F *hArm = new TH2F("hArm","Armenteros plot",50,-2,2,50,0,1);
82   hArm->SetXTitle("#alpha");
83   hArm->SetYTitle("q_{t}");
84
85   // open input file and get tree
86   TFile *inFile = TFile::Open(inName);
87
88   TTree *treeD0 = (TTree*)inFile->Get("TreeD0");
89   AliD0toKpi *D = 0; 
90   treeD0->SetBranchAddress("D0toKpi",&D);
91   Int_t entries = (Int_t)treeD0->GetEntries();
92
93   printf("+++\n+++ Number of D0 in tree:  %d\n+++\n",entries);
94
95   Double_t MD0,MD0bar,ctsD0,ctsD0bar,ctsPiD0,ctsPiD0bar;
96   Double_t WgtD0,WgtD0bar;
97   Double_t sampleABC=0.;
98   Int_t okD0=0,okD0bar=0;
99   Int_t nSel = 0;
100   Int_t ptbin;
101
102   // loop on D0
103   for(Int_t i=0; i<entries; i++) {
104     if(i%10000==0) printf(" candidate %d of %d\n",i,entries);
105
106     // get event from tree
107     treeD0->GetEvent(i);
108     //--- select the PID strategy & compute weights
109     //    D->ApplyPID("TOFparam_PbPb");
110     //    D->ComputeWgts();
111     // get weights for the three samples A+B+C 
112     //    D->GetWgts(WgtD0,WgtD0bar,"ABC");
113     WgtD0 = 1.; WgtD0bar = 1.;
114
115     // normalize to 1 event
116     if(normalize) { WgtD0 /= events; WgtD0bar /= events; }
117
118     // check if candidate passes selection (as D0 or D0bar)
119     D->Select(D0Cuts,okD0,okD0bar);
120
121     // set weights to 0 if the candidate doesn't pass selection
122     if(!okD0)    WgtD0=0.; 
123     if(!okD0bar) WgtD0bar=0.;
124     if(okD0 || okD0bar) nSel++;
125
126     // count selected candidates
127     sampleABC += WgtD0 + WgtD0bar;
128
129     // inv mass and cosThetaStar
130     D->InvMass(MD0,MD0bar);
131     D->CosThetaStar(ctsD0,ctsD0bar);
132     
133     // fill histograms
134     hptK->Fill(D->PtChild(1),WgtD0);
135     hptK->Fill(D->PtChild(0),WgtD0bar);
136     hptPi->Fill(D->PtChild(0),WgtD0);
137     hptPi->Fill(D->PtChild(1),WgtD0bar);
138     hd0K->Fill(D->Getd0Child(1),WgtD0);
139     hd0K->Fill(D->Getd0Child(0),WgtD0bar);
140     hd0Pi->Fill(D->Getd0Child(0),WgtD0);
141     hd0Pi->Fill(D->Getd0Child(1),WgtD0bar);   
142     hMass->Fill(MD0,WgtD0);
143     hMass->Fill(MD0bar,WgtD0bar);
144     hCts->Fill(ctsD0,WgtD0);
145     hCts->Fill(ctsD0bar,WgtD0bar);
146     hCtsVsPtK->Fill(D->PtChild(1),ctsD0,WgtD0);
147     hCtsVsPtK->Fill(D->PtChild(0),ctsD0bar,WgtD0bar);
148     hDCA->Fill(D->GetDCA(),WgtD0+WgtD0bar);
149     hptD0->Fill(D->Pt(),WgtD0+WgtD0bar);
150     hyD0->Fill(D->Rapidity(),WgtD0+WgtD0bar);
151     hd0d0->Fill(D->ProdImpParams(),WgtD0+WgtD0bar);
152     hCPtaD0->Fill(D->CosPointing(),WgtD0+WgtD0bar);
153     hCPtaXY->Fill(D->CosPointingXY(),WgtD0+WgtD0bar);
154     hCPtaVsd0d0->Fill(D->ProdImpParams(),D->CosPointing(),WgtD0+WgtD0bar);
155     hd0d0VSptD0->Fill(D->Pt(),D->ProdImpParams(),WgtD0+WgtD0bar);
156     hCPtaVsd0d0zoom->Fill(D->ProdImpParams(),D->CosPointing(),WgtD0+WgtD0bar);
157     hArm->Fill(D->Alpha(),D->Qt(),WgtD0+WgtD0bar);
158     
159    
160   } // end loop on D0 candidates
161
162   inFile->Close();
163
164   printf("\n\n --- Total number of candidates passing selection: %d\n\n --- Sum of weights sample A+B+C: %f\n\n",nSel,sampleABC); 
165   
166   // draw histograms
167   TCanvas *c1 = new TCanvas("c1","pt K & pi",0,0,700,700);
168   c1->SetLogy(); 
169   hptK->Draw();
170   hptPi->Draw("same");
171
172   TCanvas *c2 = new TCanvas("c2","pt D0",0,0,700,700);
173   c2->SetLogy(); 
174   hptD0->Draw();
175
176   TCanvas *c3 = new TCanvas("c3","rapidity D0",0,0,700,700);
177   hyD0->Draw(); 
178
179   TCanvas *c4 = new TCanvas("c4","pointing angle",0,0,700,700);
180   hCPtaD0->Draw();
181
182   TCanvas *c5 = new TCanvas("c5","d0 x d0",0,0,700,700);
183   c5->SetLogy();
184   hd0d0->Draw();
185
186   TCanvas *c6 = new TCanvas("c6","pointing angle VS d0d0",0,0,700,700);
187   c6->SetLogz();
188   hCPtaVsd0d0->Draw("box");
189
190   TCanvas *c7 = new TCanvas("c7","mass",0,0,700,700);
191   hMass->Draw();
192
193   TCanvas *c8 = new TCanvas("c8","armenteros",0,0,700,700);
194   hArm->Draw("box");
195
196   TCanvas *c9 = new TCanvas("c9","decay angle",0,0,700,700); 
197   hCts->Draw();
198
199   TCanvas *c10 = new TCanvas("c10","dca",0,0,700,700);
200   c10->SetLogy();
201   hDCA->Draw();
202
203   TCanvas *c11 = new TCanvas("c11","d0 K & pi",0,0,700,700);
204   c11->SetLogy();
205   hd0K->Draw();
206   hd0Pi->Draw("same");
207
208   // write all histograms to file
209   TFile *outFile = new TFile(outName,"recreate");
210   hMass->Write();
211   hDCA->Write(); 
212   hCts->Write();
213   hCtsVsPtK->Write();
214   hArm->Write();
215   hCPtaVsd0d0->Write();
216   hd0d0VSptD0->Write();
217   hCPtaVsd0d0zoom->Write();
218   hd0d0->Write();
219   hCPtaD0->Write();
220   hCPtaXY->Write();
221   hptK->Write();
222   hptPi->Write();
223   hptD0->Write();
224   hyD0->Write();
225   hd0K->Write();
226   hd0Pi->Write();
227   outFile->Close();
228   
229   return;
230 }
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