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e10611f0 | 1 | // |
2 | // This macro performs the matching operation between ESD tracks | |
3 | // and EMCAL clusters (stored as AliESDCaloCluster objects). | |
4 | // Due to the necessity to know the magnetic field, it is supposed that | |
5 | // this macro runs in the directory where event files are stored | |
6 | // (galice.root --> recovery magnetic field), and saves its output in | |
7 | // a directory specified in the argument (default = work directory) | |
8 | // | |
9 | ||
10 | void FindMatches(const char *fileOut = "matchESD.root") | |
11 | { | |
12 | // | |
13 | // Initialize AliRun manager. | |
14 | // | |
15 | if (gAlice) { | |
16 | delete gAlice; | |
17 | gAlice = 0; | |
18 | } | |
19 | ||
20 | // | |
21 | // Initialize AliRunLoader, in order | |
22 | // to read magnetic field from simulation. | |
23 | // | |
24 | AliRunLoader *rl = AliRunLoader::Open("galice.root"); | |
25 | if (!rl) return; | |
26 | rl->LoadgAlice(); | |
27 | gAlice = rl->GetAliRun(); | |
28 | AliMagF *magf = gAlice->Field(); | |
29 | Bool_t constField = (magf->Type() == 1); | |
30 | AliTracker::SetFieldMap(magf, constField); | |
31 | ||
32 | // | |
33 | // Open ESD file and recoveries TTree of ESD objects. | |
34 | // | |
35 | TFile *esdFile = new TFile("AliESDs.root"); | |
36 | TTree *esdTree = (TTree*)esdFile->Get("esdTree"); | |
37 | AliESD *esd = 0; | |
38 | esdTree->SetBranchAddress("ESD", &esd); | |
39 | Long64_t nEvents = esdTree->GetEntries(); | |
40 | ||
41 | // | |
42 | // Set this important flag to the tracker. | |
43 | // This example works with and AliESD file already saved | |
44 | // after the tracking procedure done during AliReconstruction::Run(). | |
45 | // All tracks saved in such a file, are already propagated to the vertex, | |
46 | // while EMCAL matching needs to be done using track status in the outermost | |
47 | // available position. | |
48 | // Then, we must use the "outer" parameters in the ESD track, and we must | |
49 | // tell to the track to copy the outer parameters from its AliESDtrack seed. | |
50 | // | |
51 | AliEMCALTrack::SetUseOuterParams(kTRUE); | |
52 | ||
53 | // | |
54 | // Instantiate match finder, and set some cuts. | |
55 | // Distances are in centimeters, angles in degrees. | |
56 | // | |
57 | AliEMCALTracker *mf = new AliEMCALTracker; | |
58 | mf->SetCutX(5.0); | |
59 | mf->SetCutY(5.0); | |
60 | mf->SetCutZ(5.0); | |
61 | mf->SetCutAlpha(-50., 50.); // --> i.e. exclude this cut | |
62 | mf->SetCutAngle(10.); | |
63 | mf->SetMaxDistance(5.0); | |
64 | ||
65 | // | |
66 | // Define how to manage energy loss correction. | |
67 | // Actually, these corrections are exlcluded. | |
68 | // | |
69 | // mf->SetCorrection(0.0604557, 34.5437); // at the moment, we exclude energy loss correction | |
70 | mf->SetTrackCorrectionMode("NONE"); | |
71 | mf->SetNumberOfSteps(0); | |
72 | //TGeoManager::Import("misaligned_geometry.root"); | |
73 | ||
74 | // | |
75 | // Before starting looping on files, the output file is created. | |
76 | // It will be structurally identical to the ESD source tree, with the | |
77 | // only difference that here the "fEMCALindex" datamember of the ESD tracks | |
78 | // will have been set to a meaningful value. | |
79 | // | |
80 | TFile *outFile = TFile::Open(fileOut, "RECREATE"); | |
81 | TTree *outTree = new TTree("esdTree", "ESD with matched clusters"); | |
82 | outTree->Branch("ESD", "AliESD", &esd); | |
83 | ||
84 | // | |
85 | // Loop on events. | |
86 | // The whole track matching procedure is compiled in the | |
87 | // method "PropagateBack" which accepts and input ESD collection. | |
88 | // This method modifies the passed object then, the same object is linked | |
89 | // to source tree and target tree branch. | |
90 | // | |
91 | Int_t nTracks, nStep1, nStep2, nSaved; | |
92 | for (Long64_t iev = 0; iev < nEvents; iev++) { | |
93 | cout << "Finding matches in event " << iev + 1 << "/" << nEvents << endl; | |
94 | esdTree->GetEntry(iev); | |
95 | mf->PropagateBack(esd); | |
96 | outTree->Fill(); | |
97 | } | |
98 | ||
99 | // | |
100 | // Save processed tree and close output file. | |
101 | // | |
102 | outFile->cd(); | |
103 | outTree->Write("esdTree", TObject::kOverwrite); | |
104 | outFile->Close(); | |
105 | } |