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fcca9870 | 1 | void ReadAODVertexingHF(const char *aodFileName="AliAOD.root", |
2 | const char *aodHFFileName="AliAOD.VertexingHF.root") | |
3 | { | |
4 | // | |
5 | // Example macro to read D0->Kpi candidates from AOD and apply cuts | |
6 | // Origin: A.Dainese | |
7 | // | |
8 | gSystem->Load("libANALYSIS.so"); | |
9 | gSystem->Load("libANALYSISalice.so"); | |
10 | gSystem->Load("libAOD.so"); | |
11 | gSystem->Load("libPWG3base.so"); | |
12 | ||
13 | // create a test histogram | |
14 | TH2F *hCPtaVSd0d0 = new TH2F("hCPtaVSd0d0","D^{0} correlation plot",1000,-50000,50000,1000,-1,1); | |
15 | hCPtaVSd0d0->SetXTitle("Product of impact parameters [#mu m^{2}]"); | |
16 | hCPtaVSd0d0->SetYTitle("Cosine of pointing angle"); | |
17 | TH1F *hMass = new TH1F("hMass","D^{0} mass plot",100,1.7,2); | |
18 | hMass->SetXTitle("Invariant mass [GeV]"); | |
19 | hMass->SetYTitle("Entries"); | |
20 | TH1F *hSecVtxZ = new TH1F("hSecVtxZ","D^{0} decay vertex z",1000,-10,10); | |
21 | hSecVtxZ->SetXTitle("z of decay vertex [cm]"); | |
22 | hSecVtxZ->SetYTitle("Entries"); | |
23 | ||
24 | // open input file and get the TTree | |
25 | TFile inFile(aodFileName,"READ"); | |
26 | if (!inFile.IsOpen()) return; | |
27 | ||
28 | TTree *aodTree = (TTree*)inFile.Get("aodTree"); | |
29 | aodTree->AddFriend("aodTree",aodHFFileName); | |
30 | ||
31 | AliAODEvent *aod = new AliAODEvent(); | |
32 | ||
33 | aod->ReadFromTree(aodTree); | |
34 | ||
35 | // load heavy flavour vertices | |
36 | TClonesArray *arrayVerticesHF = | |
37 | (TClonesArray*)aod->GetList()->FindObject("VerticesHF"); | |
38 | ||
39 | // load D0->Kpi candidates | |
40 | TClonesArray *arrayD0toKpi = | |
41 | (TClonesArray*)aod->GetList()->FindObject("D0toKpi"); | |
42 | ||
43 | // load 3prong candidates | |
44 | TClonesArray *array3Prong = | |
45 | (TClonesArray*)aod->GetList()->FindObject("Charm3Prong"); | |
46 | ||
47 | ||
48 | Double_t cutsD0[9]= | |
49 | // cutsD0[0] = inv. mass half width [GeV] | |
50 | // cutsD0[1] = dca [cm] | |
51 | // cutsD0[2] = cosThetaStar | |
52 | // cutsD0[3] = pTK [GeV/c] | |
53 | // cutsD0[4] = pTPi [GeV/c] | |
54 | // cutsD0[5] = d0K [cm] upper limit! | |
55 | // cutsD0[6] = d0Pi [cm] upper limit! | |
56 | // cutsD0[7] = d0d0 [cm^2] | |
57 | // cutsD0[8] = cosThetaPoint | |
58 | {1000., | |
59 | 100000., | |
60 | 1.1, | |
61 | 0., | |
62 | 0., | |
63 | 100000., | |
64 | 100000., | |
65 | 100000000., | |
66 | -1.1}; | |
67 | ||
68 | Int_t nTotHF=0,nTotD0toKpi=0,nTot3Prong=0; | |
69 | AliAODVertex *vtx1=0; | |
70 | ||
71 | // loop over events | |
72 | Int_t nEvents = aodTree->GetEntries(); | |
73 | for (Int_t nEv = 0; nEv < nEvents; nEv++) { | |
74 | cout<<"\n------------ Event: "<<nEv<<" ------------------"<<endl; | |
75 | ||
76 | // read event | |
77 | aodTree->GetEvent(nEv); | |
78 | //aodTree->BranchRef(); | |
79 | ||
80 | //print event info | |
81 | aod->GetHeader()->Print(); | |
82 | ||
83 | // primary vertex | |
84 | vtx1 = (AliAODVertex*)aod->GetPrimaryVertex(); | |
85 | vtx1->Print(); | |
86 | ||
87 | // make trkIDtoEntry register (temporary) | |
88 | Int_t trkIDtoEntry[100000]; | |
89 | for(Int_t it=0;it<aod->GetNumberOfTracks();it++) { | |
90 | AliAODTrack *track = aod->GetTrack(it); | |
91 | trkIDtoEntry[track->GetID()]=it; | |
92 | } | |
93 | ||
94 | // loop over D0->Kpi candidates | |
95 | Int_t nD0toKpi = arrayD0toKpi->GetEntriesFast(); | |
96 | nTotD0toKpi += nD0toKpi; | |
97 | cout<<"Number of D0->Kpi: "<<nD0toKpi<<endl; | |
98 | ||
99 | for (Int_t iD0toKpi = 0; iD0toKpi < nD0toKpi; iD0toKpi++) { | |
100 | AliAODRecoDecayHF2Prong *d = (AliAODRecoDecayHF2Prong*)arrayD0toKpi->UncheckedAt(iD0toKpi); | |
101 | Bool_t unsetvtx=kFALSE; | |
102 | if(!d->GetOwnPrimaryVtx()) { | |
103 | d->SetOwnPrimaryVtx(vtx1); // needed to compute all variables | |
104 | unsetvtx=kTRUE; | |
105 | } | |
106 | Int_t okD0=0,okD0bar=0; | |
107 | if(d->SelectD0(cutsD0,okD0,okD0bar)) { | |
108 | //cout<<1e8*d->Prodd0d0()<<endl; | |
109 | hMass->Fill(d->InvMassD0(),0.5); | |
110 | hMass->Fill(d->InvMassD0bar(),0.5); | |
111 | hCPtaVSd0d0->Fill(1e8*d->Prodd0d0(),d->CosPointingAngle()); | |
112 | hSecVtxZ->Fill(d->GetSecVtxZ()); | |
113 | //cout<<d->GetSecVtxZ() <<endl; | |
114 | ||
115 | // get daughter AOD tracks | |
116 | AliAODTrack *trk0=aod->GetTrack(trkIDtoEntry[d->GetProngID(0)]); | |
117 | AliAODTrack *trk1=aod->GetTrack(trkIDtoEntry[d->GetProngID(1)]); | |
118 | cout<<"pt of positive track: "<<trk0->Pt()<<endl; | |
119 | // this will be replaced by | |
120 | //AliAODTrack *trk0 = (AliAODTrack*)(d->GetSecondaryVtx()->GetDaughter(0)); | |
121 | } | |
122 | if(unsetvtx) d->UnsetOwnPrimaryVtx(); | |
123 | } | |
124 | // Instanciates vHF and loads its parameters | |
125 | ||
126 | // count 3prong candidates | |
127 | Int_t n3Prong = array3Prong->GetEntriesFast(); | |
128 | nTot3Prong += n3Prong; | |
129 | cout<<"Number of Charm->3Prong: "<<n3Prong<<endl; | |
130 | ||
131 | // loop over HF vertices | |
132 | Int_t nVtxsHF = arrayVerticesHF->GetEntriesFast(); | |
133 | nTotHF += nVtxsHF; | |
134 | cout<<"Number of heavy-flavour vertices: "<<nVtxsHF<<endl; | |
135 | for (Int_t iVtx = 0; iVtx < nVtxsHF; iVtx++) { | |
136 | AliAODVertex *vtxHF = (AliAODVertex*)arrayVerticesHF->UncheckedAt(iVtx); | |
137 | // print info | |
138 | //cout << iVtx << ": vertex z position: " << vtxHF->GetZ() << endl; | |
139 | } | |
140 | ||
141 | } | |
142 | ||
143 | printf("\n Total HF vertices: %d\n",nTotHF); | |
144 | printf("\n Total D0->Kpi: %d\n",nTotD0toKpi); | |
145 | printf("\n Total Charm->3Prong: %d\n",nTot3Prong); | |
146 | ||
147 | TCanvas *c = new TCanvas("c","c",0,0,1000,1000); | |
148 | c->Divide(2,2); | |
149 | c->cd(1); | |
150 | hCPtaVSd0d0->Draw("colz"); | |
151 | c->cd(2); | |
152 | hMass->SetFillColor(4); | |
153 | hMass->Draw(); | |
154 | c->cd(3); | |
155 | hSecVtxZ->SetFillColor(2); | |
156 | hSecVtxZ->Draw(); | |
157 | ||
158 | return; | |
159 | } |