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