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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 | { | |
99e5fe42 | 37 | // Constructor |
0ea82296 | 38 | fNassoc = 0; |
99e5fe42 | 39 | fLeading = new TLorentzVector(0.,0.,0.,0.); |
0ea82296 | 40 | fLow = -TMath::Pi()/2.0; |
41 | fnBin = 45; | |
42 | fCorr = TArrayI(fnBin); | |
bb828f00 | 43 | fFound = kFALSE; |
99e5fe42 | 44 | } |
45 | ||
46 | //////////////////////////////////////////////////////////////////////// | |
47 | ||
48 | AliLeading::~AliLeading() | |
49 | { | |
99e5fe42 | 50 | // Destructor |
99e5fe42 | 51 | delete fLeading; |
52 | } | |
53 | ||
54 | //////////////////////////////////////////////////////////////////////// | |
55 | ||
56 | void AliLeading::FindLeading(AliJetReader *reader) | |
99e5fe42 | 57 | { |
99e5fe42 | 58 | // find leading particle in the array of lorentz vectors |
59 | // lvArray and fill the correlation histogram | |
83a444b1 | 60 | |
1d9fb3a1 | 61 | AliJetReaderHeader* header = reader->GetReaderHeader(); |
83a444b1 | 62 | |
99e5fe42 | 63 | TClonesArray* lvArray = reader->GetMomentumArray(); |
64 | Int_t nIn = lvArray->GetEntries(); | |
83a444b1 | 65 | |
99e5fe42 | 66 | // find max |
67 | Double_t ptMax = 0.0; | |
68 | Int_t idxMax = -1; | |
1d9fb3a1 | 69 | for (Int_t i = 0; i < nIn; i++){ |
83a444b1 | 70 | TLorentzVector *lv = (TLorentzVector*) lvArray->At(i); |
71 | if ((reader->GetCutFlag(i) == 1) && | |
72 | lv->Pt() > ptMax && | |
73 | lv->Eta() > header->GetFiducialEtaMin() && | |
74 | lv->Eta() < header->GetFiducialEtaMax()){ | |
75 | ptMax = lv->Pt(); | |
76 | idxMax = i; | |
77 | } | |
99e5fe42 | 78 | } |
1d9fb3a1 | 79 | |
bb828f00 | 80 | if (idxMax == -1) { |
83a444b1 | 81 | fFound = kFALSE; |
82 | Reset(); | |
83 | return; | |
bb828f00 | 84 | } |
0ea82296 | 85 | |
99e5fe42 | 86 | // fill correlation array |
87 | fLeading = (TLorentzVector*) lvArray->At(idxMax); | |
bb828f00 | 88 | fFound = kTRUE; |
89 | ||
83a444b1 | 90 | fNassoc = 0; |
1d9fb3a1 | 91 | for (Int_t i = 0; i < nIn; i++) { |
83a444b1 | 92 | if (i == idxMax) continue; |
93 | TLorentzVector *lv = (TLorentzVector*) lvArray->At(i); | |
94 | if ( (reader->GetCutFlag(i) == 1) && | |
95 | lv->Eta() > header->GetFiducialEtaMin() && | |
96 | lv->Eta() < header->GetFiducialEtaMax()) { | |
1d9fb3a1 | 97 | Double_t dphi = fLeading->DeltaPhi(*lv); |
98 | if (dphi < fLow) dphi = 2.0 * TMath::Pi() + dphi; | |
99 | // find bin and fill array | |
bb828f00 | 100 | Int_t iBin = (Int_t) |
83a444b1 | 101 | TMath::Floor((dphi - fLow) |
102 | *((Double_t) fnBin) / (2.0 * TMath::Pi())); | |
1d9fb3a1 | 103 | fCorr.AddAt(fCorr.At(iBin)+1,iBin); |
83a444b1 | 104 | fNassoc++; |
105 | } | |
99e5fe42 | 106 | } |
107 | } | |
108 | ||
109 | //////////////////////////////////////////////////////////////////////// | |
110 | ||
111 | void AliLeading::Reset() | |
112 | ||
113 | { | |
bb828f00 | 114 | // Reset leading particle information |
1d9fb3a1 | 115 | fLeading->SetPxPyPzE(0., 0., 0., 0.); |
99e5fe42 | 116 | fNassoc=0; |
117 | fCorr.Reset(); | |
118 | } | |
119 | ||
120 | //////////////////////////////////////////////////////////////////////// | |
121 | ||
122 | void AliLeading::PrintLeading() | |
99e5fe42 | 123 | { |
124 | // Print leading particle information | |
125 | if (fNassoc<0) { | |
126 | cout << " No leading particle in this event" << endl; | |
127 | return; | |
128 | } | |
129 | cout << " Leading particle: " << endl; | |
130 | cout << " (px,py,pz,e) = (" << fLeading->Px() << "," | |
131 | << fLeading->Py() << "," << fLeading->Pz() << "," | |
132 | << fLeading->E() << ")" << endl; | |
133 | cout << " (pt,eta,phi) = (" << fLeading->Pt() << "," | |
134 | << fLeading->Eta() << "," << fLeading->Phi() << ")" << endl; | |
135 | cout << " " << fNassoc << " associated particles." << endl; | |
136 | } | |
83a444b1 | 137 | |
138 | //////////////////////////////////////////////////////////////////////// | |
139 | ||
140 | Double_t AliLeading::GetE() | |
141 | { | |
142 | return fLeading->E(); | |
143 | } | |
144 | ||
145 | //////////////////////////////////////////////////////////////////////// | |
146 | ||
147 | Double_t AliLeading::GetPt() | |
148 | { | |
149 | return fLeading->Pt(); | |
150 | } | |
151 | ||
152 | //////////////////////////////////////////////////////////////////////// | |
153 | ||
154 | Double_t AliLeading::GetEta() | |
155 | { | |
156 | return fLeading->Eta(); | |
157 | } | |
158 | ||
159 | //////////////////////////////////////////////////////////////////////// | |
160 | ||
161 | Double_t AliLeading::GetPhi() | |
162 | { | |
163 | // get phi of leading | |
164 | return ( (fLeading->Phi() < 0) ? | |
165 | (fLeading->Phi()) + 2. * TMath::Pi() : | |
166 | fLeading->Phi()); | |
167 | } | |
168 |