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99e5fe42 | 1 | /************************************************************************** |
2 | * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. * | |
3 | * * | |
4 | * Author: The ALICE Off-line Project. * | |
5 | * Contributors are mentioned in the code where appropriate. * | |
6 | * * | |
7 | * Permission to use, copy, modify and distribute this software and its * | |
8 | * documentation strictly for non-commercial purposes is hereby granted * | |
9 | * without fee, provided that the above copyright notice appears in all * | |
10 | * copies and that both the copyright notice and this permission notice * | |
11 | * appear in the supporting documentation. The authors make no claims * | |
12 | * about the suitability of this software for any purpose. It is * | |
13 | * provided "as is" without express or implied warranty. * | |
14 | **************************************************************************/ | |
15 | ||
16 | //--------------------------------------------------------------------- | |
17 | // Class to find and store the leading particle in event and | |
18 | // store its correlation to associated particles | |
19 | // Author: jgcn@mda.cinvestav.mx | |
20 | //--------------------------------------------------------------------- | |
21 | ||
22 | #include <Riostream.h> | |
23 | #include <TMath.h> | |
24 | #include <TClonesArray.h> | |
25 | #include <TLorentzVector.h> | |
26 | ||
27 | #include "AliLeading.h" | |
1d9fb3a1 | 28 | #include "AliJetReader.h" |
29 | #include "AliJetReaderHeader.h" | |
99e5fe42 | 30 | |
31 | ClassImp(AliLeading) | |
32 | ||
33 | //////////////////////////////////////////////////////////////////////// | |
34 | ||
35 | AliLeading::AliLeading() | |
36 | { | |
37 | // | |
38 | // Constructor | |
39 | // | |
0ea82296 | 40 | fNassoc = 0; |
99e5fe42 | 41 | fLeading = new TLorentzVector(0.,0.,0.,0.); |
0ea82296 | 42 | fLow = -TMath::Pi()/2.0; |
43 | fnBin = 45; | |
44 | fCorr = TArrayI(fnBin); | |
bb828f00 | 45 | fFound = kFALSE; |
99e5fe42 | 46 | } |
47 | ||
48 | //////////////////////////////////////////////////////////////////////// | |
49 | ||
50 | AliLeading::~AliLeading() | |
51 | { | |
52 | // | |
53 | // Destructor | |
54 | // | |
55 | delete fLeading; | |
56 | } | |
57 | ||
58 | //////////////////////////////////////////////////////////////////////// | |
59 | ||
60 | void AliLeading::FindLeading(AliJetReader *reader) | |
61 | ||
62 | { | |
63 | // | |
64 | // find leading particle in the array of lorentz vectors | |
65 | // lvArray and fill the correlation histogram | |
66 | // | |
1d9fb3a1 | 67 | |
68 | ||
69 | AliJetReaderHeader* header = reader->GetReaderHeader(); | |
70 | ||
99e5fe42 | 71 | TClonesArray* lvArray = reader->GetMomentumArray(); |
72 | Int_t nIn = lvArray->GetEntries(); | |
73 | fNassoc = nIn-1; | |
74 | ||
75 | if (fNassoc < 0) return; | |
76 | ||
77 | // find max | |
78 | Double_t ptMax = 0.0; | |
79 | Int_t idxMax = -1; | |
1d9fb3a1 | 80 | for (Int_t i = 0; i < nIn; i++){ |
81 | TLorentzVector *lv = (TLorentzVector*) lvArray->At(i); | |
82 | if (lv->Pt() > ptMax && | |
83 | lv->Eta() > header->GetFiducialEtaMin() && | |
84 | lv->Eta() < header->GetFiducialEtaMax()) | |
85 | { | |
86 | ptMax = lv->Pt(); | |
87 | idxMax = i; | |
88 | } | |
99e5fe42 | 89 | } |
1d9fb3a1 | 90 | |
bb828f00 | 91 | if (idxMax == -1) { |
92 | fFound = kFALSE; | |
93 | Reset(); | |
94 | return; | |
95 | } | |
0ea82296 | 96 | |
99e5fe42 | 97 | // fill correlation array |
98 | fLeading = (TLorentzVector*) lvArray->At(idxMax); | |
bb828f00 | 99 | fFound = kTRUE; |
100 | ||
1d9fb3a1 | 101 | for (Int_t i = 0; i < nIn; i++) { |
102 | if (i == idxMax) continue; | |
103 | TLorentzVector *lv = (TLorentzVector*) lvArray->At(i); | |
104 | Double_t dphi = fLeading->DeltaPhi(*lv); | |
105 | if (dphi < fLow) dphi = 2.0 * TMath::Pi() + dphi; | |
106 | // find bin and fill array | |
107 | ||
bb828f00 | 108 | Int_t iBin = (Int_t) |
109 | TMath::Floor((dphi - fLow) | |
110 | *((Double_t) fnBin) / (2.0 * TMath::Pi())); | |
1d9fb3a1 | 111 | fCorr.AddAt(fCorr.At(iBin)+1,iBin); |
99e5fe42 | 112 | } |
113 | } | |
114 | ||
115 | //////////////////////////////////////////////////////////////////////// | |
116 | ||
117 | void AliLeading::Reset() | |
118 | ||
119 | { | |
bb828f00 | 120 | // Reset leading particle information |
1d9fb3a1 | 121 | fLeading->SetPxPyPzE(0., 0., 0., 0.); |
99e5fe42 | 122 | fNassoc=0; |
123 | fCorr.Reset(); | |
124 | } | |
125 | ||
126 | //////////////////////////////////////////////////////////////////////// | |
127 | ||
128 | void AliLeading::PrintLeading() | |
129 | ||
130 | { | |
131 | // Print leading particle information | |
132 | if (fNassoc<0) { | |
133 | cout << " No leading particle in this event" << endl; | |
134 | return; | |
135 | } | |
136 | cout << " Leading particle: " << endl; | |
137 | cout << " (px,py,pz,e) = (" << fLeading->Px() << "," | |
138 | << fLeading->Py() << "," << fLeading->Pz() << "," | |
139 | << fLeading->E() << ")" << endl; | |
140 | cout << " (pt,eta,phi) = (" << fLeading->Pt() << "," | |
141 | << fLeading->Eta() << "," << fLeading->Phi() << ")" << endl; | |
142 | cout << " " << fNassoc << " associated particles." << endl; | |
143 | } |