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d92b41ad | 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 | /* $Id: $ */ | |
16 | ||
17 | /* History of cvs commits: | |
18 | * | |
19 | * $Log$ | |
20 | ||
21 | * | |
22 | * | |
23 | */ | |
24 | ||
25 | //_________________________________________________________________________ | |
26 | // Class containing methods for the isolation cut. | |
27 | // | |
28 | // | |
29 | //*-- Author: Gustavo Conesa (LNF-INFN) | |
30 | ////////////////////////////////////////////////////////////////////////////// | |
31 | ||
32 | ||
33 | // --- ROOT system --- | |
34 | #include <Riostream.h> | |
35 | #include <TLorentzVector.h> | |
36 | #include <TSeqCollection.h> | |
37 | ||
38 | // --- AliRoot system --- | |
39 | #include "AliIsolationCut.h" | |
40 | #include "AliLog.h" | |
41 | #include "AliAODParticleCorrelation.h" | |
42 | #include "AliAODTrack.h" | |
43 | #include "AliAODCaloCluster.h" | |
44 | ||
45 | ClassImp(AliIsolationCut) | |
46 | ||
47 | //____________________________________________________________________________ | |
48 | AliIsolationCut::AliIsolationCut() : | |
49 | TObject(), | |
50 | fConeSize(0.),fPtThreshold(0.), fPtFraction(0.), fICMethod(0) | |
51 | ||
52 | { | |
53 | //default ctor | |
54 | ||
55 | //Initialize parameters | |
56 | InitParameters(); | |
57 | ||
58 | } | |
59 | ||
60 | //____________________________________________________________________________ | |
61 | AliIsolationCut::AliIsolationCut(const AliIsolationCut & g) : | |
62 | TObject(g), | |
63 | fConeSize(g.fConeSize), | |
64 | fPtThreshold(g.fPtThreshold), | |
65 | fPtFraction(g.fPtFraction), | |
66 | fICMethod(g.fICMethod) | |
67 | { | |
68 | // cpy ctor | |
69 | ||
70 | } | |
71 | ||
72 | //_________________________________________________________________________ | |
73 | AliIsolationCut & AliIsolationCut::operator = (const AliIsolationCut & source) | |
74 | { | |
75 | // assignment operator | |
76 | ||
77 | if(&source == this) return *this; | |
78 | ||
79 | fConeSize = source.fConeSize ; | |
80 | fPtThreshold = source.fPtThreshold ; | |
81 | fICMethod = source.fICMethod ; | |
82 | fPtFraction = source.fPtFraction ; | |
83 | ||
84 | return *this; | |
85 | ||
86 | } | |
87 | ||
88 | ||
89 | ||
90 | ||
91 | //____________________________________________________________________________ | |
92 | void AliIsolationCut::InitParameters() | |
93 | { | |
94 | //Initialize the parameters of the analysis. | |
95 | ||
96 | fConeSize = 0.4 ; | |
97 | fPtThreshold = 1. ; | |
98 | fPtFraction = 0.1 ; | |
99 | ||
100 | fICMethod = kPtThresIC; // 0 pt threshol method, 1 cone pt sum method | |
101 | ||
102 | } | |
103 | ||
104 | //__________________________________________________________________ | |
105 | void AliIsolationCut::MakeIsolationCut(TSeqCollection * plCTS, TSeqCollection * plNe, Double_t * vertex, | |
106 | const Bool_t fillAOD, AliAODParticleCorrelation *pCandidate, | |
107 | const Int_t index1, const Int_t index2, | |
108 | Int_t & n, Int_t & nfrac, Float_t &coneptsum, Bool_t &isolated) | |
109 | { | |
110 | //Search in cone around a candidate particle if it is isolated | |
111 | Float_t phiC = pCandidate->Phi() ; | |
112 | Float_t etaC = pCandidate->Eta() ; | |
113 | Float_t ptC = pCandidate->Pt() ; | |
114 | Float_t pt = -100. ; | |
115 | Float_t eta = -100. ; | |
116 | Float_t phi = -100. ; | |
117 | Float_t rad = -100 ; | |
118 | ||
119 | n = 0 ; | |
120 | coneptsum = 0.; | |
121 | isolated = kFALSE; | |
122 | ||
123 | //Check charged particles in cone. | |
124 | if(plCTS){ | |
125 | TVector3 p3; | |
126 | for(Int_t ipr = 0;ipr < plCTS->GetEntries() ; ipr ++ ){ | |
127 | if(ipr == index1 || ipr == index2) continue ;//Do not count the candidate | |
128 | AliAODTrack* track = dynamic_cast<AliAODTrack *>(plCTS->At(ipr)) ; | |
129 | p3.SetXYZ(track->Px(),track->Py(),track->Pz()); | |
130 | pt = p3.Pt(); | |
131 | eta = p3.Eta(); | |
132 | phi = p3.Phi() ; | |
133 | if(phi<0) phi+=TMath::TwoPi(); | |
134 | ||
135 | //Check if there is any particle inside cone with pt larger than fPtThreshold | |
136 | rad = TMath::Sqrt((eta-etaC)*(eta-etaC)+ (phi-phiC)*(phi-phiC)); | |
137 | ||
138 | if(rad < fConeSize){ | |
139 | if(fillAOD) pCandidate->AddIsolationConeTrack(track); | |
140 | //printf("charged in isolation cone pt %f, phi %f, eta %f, R %f \n",pt,phi,eta,rad); | |
141 | coneptsum+=pt; | |
142 | if(pt > fPtThreshold ) n++; | |
143 | if(pt > fPtFraction*ptC ) nfrac++; | |
144 | } | |
145 | }// charged particle loop | |
146 | }//Tracks | |
147 | ||
148 | //Check neutral particles in cone. | |
149 | if(plNe){ | |
150 | TLorentzVector mom ; | |
151 | for(Int_t ipr = 0;ipr < plNe->GetEntries() ; ipr ++ ){ | |
152 | if(ipr == index1 || ipr == index2) continue ;//Do not count the candidate | |
153 | AliAODCaloCluster * calo = dynamic_cast< AliAODCaloCluster *>(plNe->At(ipr)) ; | |
154 | ||
155 | //Skip matched clusters with tracks | |
156 | if(calo->GetNTracksMatched() > 0) continue ; | |
157 | ||
158 | calo->GetMomentum(mom,vertex);//Assume that come from vertex in straight line | |
159 | pt = mom.Pt(); | |
160 | eta = mom.Eta(); | |
161 | phi = mom.Phi() ; | |
162 | if(phi<0) phi+=TMath::TwoPi(); | |
163 | ||
164 | //Check if there is any particle inside cone with pt larger than fPtThreshold | |
165 | rad = TMath::Sqrt((eta-etaC)*(eta-etaC)+ (phi-phiC)*(phi-phiC)); | |
166 | if(rad < fConeSize){ | |
167 | if(fillAOD) pCandidate->AddIsolationConeCluster(calo); | |
168 | //printf("neutral in isolation cone pt %f, phi %f, eta %f, R %f \n",pt,phi,eta,rad); | |
169 | coneptsum+=pt; | |
170 | if(pt > fPtThreshold ) n++; | |
171 | if(pt > fPtFraction*ptC ) nfrac++; | |
172 | }//in cone | |
173 | }// neutral particle loop | |
174 | }//neutrals | |
175 | ||
176 | //printf("Isolation Cut: in cone with: pT>pTthres %d, pT > pTfrac*pTcandidate %d \n",n,nfrac); | |
177 | ||
178 | //Check isolation, depending on method. | |
179 | if( fICMethod == kPtThresIC){ | |
180 | if(n==0) isolated = kTRUE ; | |
181 | } | |
182 | else if( fICMethod == kSumPtIC){ | |
183 | if(coneptsum < fPtThreshold) | |
184 | isolated = kTRUE ; | |
185 | } | |
186 | else if( fICMethod == kPtFracIC){ | |
187 | if(nfrac==0) isolated = kTRUE ; | |
188 | } | |
189 | else if( fICMethod == kSumPtFracIC){ | |
190 | if(coneptsum < fPtFraction*ptC) | |
191 | isolated = kTRUE ; | |
192 | } | |
193 | } | |
194 | ||
195 | //__________________________________________________________________ | |
196 | void AliIsolationCut::Print(const Option_t * opt) const | |
197 | { | |
198 | ||
199 | //Print some relevant parameters set for the analysis | |
200 | if(! opt) | |
201 | return; | |
202 | ||
203 | printf("**** Print %s %s **** \n", GetName(), GetTitle() ) ; | |
204 | ||
205 | printf("IC method = %d\n", fICMethod) ; | |
206 | printf("Cone Size = %1.2f\n", fConeSize) ; | |
207 | printf("pT threshold = %2.1f\n", fPtThreshold) ; | |
208 | printf("pT fraction = %3.1f\n", fPtFraction) ; | |
209 | ||
210 | printf(" \n") ; | |
211 | ||
212 | } |