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1c5acb87 | 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 | //_________________________________________________________________________ | |
18 | // Class containing methods for the isolation cut. | |
591cc579 | 19 | // An AOD candidate (AliAODPWG4ParticleCorrelation type) |
20 | // is passed. Look in a cone around the candidate and study | |
21 | // the hadronic activity inside to decide if the candidate is isolated | |
1c5acb87 | 22 | // |
23 | // | |
24 | //*-- Author: Gustavo Conesa (LNF-INFN) | |
25 | ////////////////////////////////////////////////////////////////////////////// | |
26 | ||
27 | ||
28 | // --- ROOT system --- | |
29 | //#include <Riostream.h> | |
30 | #include <TLorentzVector.h> | |
591cc579 | 31 | #include <TObjArray.h> |
1c5acb87 | 32 | |
33 | // --- AliRoot system --- | |
34 | #include "AliIsolationCut.h" | |
1c5acb87 | 35 | #include "AliAODPWG4ParticleCorrelation.h" |
36 | #include "AliAODTrack.h" | |
37 | #include "AliAODCaloCluster.h" | |
38 | ||
39 | ClassImp(AliIsolationCut) | |
40 | ||
41 | //____________________________________________________________________________ | |
42 | AliIsolationCut::AliIsolationCut() : | |
43 | TObject(), | |
44 | fConeSize(0.),fPtThreshold(0.), fPtFraction(0.), fICMethod(0) | |
45 | ||
46 | { | |
47 | //default ctor | |
48 | ||
49 | //Initialize parameters | |
50 | InitParameters(); | |
51 | ||
52 | } | |
53 | ||
54 | //____________________________________________________________________________ | |
55 | AliIsolationCut::AliIsolationCut(const AliIsolationCut & g) : | |
56 | TObject(g), | |
57 | fConeSize(g.fConeSize), | |
58 | fPtThreshold(g.fPtThreshold), | |
59 | fPtFraction(g.fPtFraction), | |
60 | fICMethod(g.fICMethod) | |
61 | { | |
62 | // cpy ctor | |
477d6cee | 63 | |
1c5acb87 | 64 | } |
65 | ||
66 | //_________________________________________________________________________ | |
67 | AliIsolationCut & AliIsolationCut::operator = (const AliIsolationCut & source) | |
68 | { | |
69 | // assignment operator | |
70 | ||
71 | if(&source == this) return *this; | |
477d6cee | 72 | |
1c5acb87 | 73 | fConeSize = source.fConeSize ; |
74 | fPtThreshold = source.fPtThreshold ; | |
75 | fICMethod = source.fICMethod ; | |
76 | fPtFraction = source.fPtFraction ; | |
77 | ||
78 | return *this; | |
79 | ||
80 | } | |
81 | ||
1c5acb87 | 82 | //____________________________________________________________________________ |
83 | TString AliIsolationCut::GetICParametersList() | |
84 | { | |
477d6cee | 85 | //Put data member values in string to keep in output container |
86 | ||
87 | TString parList ; //this will be list of parameters used for this analysis. | |
88 | char onePar[255] ; | |
89 | ||
90 | sprintf(onePar,"--- AliIsolationCut ---\n") ; | |
91 | parList+=onePar ; | |
92 | sprintf(onePar,"fConeSize: (isolation cone size) %1.2f\n",fConeSize) ; | |
93 | parList+=onePar ; | |
94 | sprintf(onePar,"fPtThreshold =%1.2f (isolation pt threshold) \n",fPtThreshold) ; | |
95 | parList+=onePar ; | |
96 | sprintf(onePar,"fPtFraction=%1.2f (isolation pt threshold fraction ) \n",fPtFraction) ; | |
97 | parList+=onePar ; | |
98 | sprintf(onePar,"fICMethod=%d (isolation cut case) \n",fICMethod) ; | |
99 | parList+=onePar ; | |
100 | ||
101 | return parList; | |
1c5acb87 | 102 | } |
103 | ||
104 | //____________________________________________________________________________ | |
105 | void AliIsolationCut::InitParameters() | |
106 | { | |
107 | //Initialize the parameters of the analysis. | |
477d6cee | 108 | |
1c5acb87 | 109 | fConeSize = 0.4 ; |
110 | fPtThreshold = 1. ; | |
111 | fPtFraction = 0.1 ; | |
477d6cee | 112 | |
1c5acb87 | 113 | fICMethod = kPtThresIC; // 0 pt threshol method, 1 cone pt sum method |
477d6cee | 114 | |
1c5acb87 | 115 | } |
116 | ||
117 | //__________________________________________________________________ | |
591cc579 | 118 | void AliIsolationCut::MakeIsolationCut(TObjArray * plCTS, TObjArray * plNe, Double_t * vertex, |
1c5acb87 | 119 | const Bool_t fillAOD, AliAODPWG4ParticleCorrelation *pCandidate, |
a3aebfff | 120 | const TString aodArrayRefName, |
1c5acb87 | 121 | Int_t & n, Int_t & nfrac, Float_t &coneptsum, Bool_t &isolated) const |
122 | { | |
477d6cee | 123 | //Search in cone around a candidate particle if it is isolated |
124 | Float_t phiC = pCandidate->Phi() ; | |
125 | Float_t etaC = pCandidate->Eta() ; | |
126 | Float_t ptC = pCandidate->Pt() ; | |
127 | Float_t pt = -100. ; | |
128 | Float_t eta = -100. ; | |
129 | Float_t phi = -100. ; | |
130 | Float_t rad = -100 ; | |
477d6cee | 131 | n = 0 ; |
132 | coneptsum = 0.; | |
133 | isolated = kFALSE; | |
a3aebfff | 134 | |
135 | //Initialize the array with refrences | |
591cc579 | 136 | TObjArray * refclusters = 0x0; |
137 | TObjArray * reftracks =0x0; | |
a3aebfff | 138 | |
139 | if(fillAOD) { | |
591cc579 | 140 | refclusters = new TObjArray; |
141 | reftracks = new TObjArray; | |
a3aebfff | 142 | } |
143 | ||
477d6cee | 144 | //Check charged particles in cone. |
145 | if(plCTS){ | |
146 | TVector3 p3; | |
147 | for(Int_t ipr = 0;ipr < plCTS->GetEntries() ; ipr ++ ){ | |
148 | AliAODTrack* track = (AliAODTrack *)(plCTS->At(ipr)) ; | |
149 | //Do not count the candidate (pion, conversion photon) or the daughters of the candidate | |
150 | if(track->GetID() == pCandidate->GetTrackLabel(0) || track->GetID() == pCandidate->GetTrackLabel(1)) continue ; | |
151 | p3.SetXYZ(track->Px(),track->Py(),track->Pz()); | |
152 | pt = p3.Pt(); | |
153 | eta = p3.Eta(); | |
154 | phi = p3.Phi() ; | |
155 | if(phi<0) phi+=TMath::TwoPi(); | |
156 | ||
157 | //Check if there is any particle inside cone with pt larger than fPtThreshold | |
158 | rad = TMath::Sqrt((eta-etaC)*(eta-etaC)+ (phi-phiC)*(phi-phiC)); | |
159 | ||
160 | if(rad < fConeSize){ | |
161 | if(fillAOD) { | |
a3aebfff | 162 | reftracks->Add(track); |
1c5acb87 | 163 | } |
477d6cee | 164 | //printf("charged in isolation cone pt %f, phi %f, eta %f, R %f \n",pt,phi,eta,rad); |
165 | coneptsum+=pt; | |
166 | if(pt > fPtThreshold ) n++; | |
167 | if(pt > fPtFraction*ptC ) nfrac++; | |
168 | } | |
169 | }// charged particle loop | |
170 | }//Tracks | |
171 | ||
172 | //Check neutral particles in cone. | |
173 | if(plNe){ | |
477d6cee | 174 | TLorentzVector mom ; |
175 | for(Int_t ipr = 0;ipr < plNe->GetEntries() ; ipr ++ ){ | |
176 | AliAODCaloCluster * calo = (AliAODCaloCluster *)(plNe->At(ipr)) ; | |
177 | ||
178 | //Do not count the candidate (photon or pi0) or the daughters of the candidate | |
179 | if(calo->GetID() == pCandidate->GetCaloLabel(0) || calo->GetID() == pCandidate->GetCaloLabel(1)) continue ; //Skip matched clusters with tracks | |
180 | ||
181 | if(calo->GetNTracksMatched() > 0) continue ; | |
182 | ||
183 | calo->GetMomentum(mom,vertex);//Assume that come from vertex in straight line | |
184 | pt = mom.Pt(); | |
185 | eta = mom.Eta(); | |
186 | phi = mom.Phi() ; | |
187 | if(phi<0) phi+=TMath::TwoPi(); | |
188 | ||
189 | //Check if there is any particle inside cone with pt larger than fPtThreshold | |
190 | rad = TMath::Sqrt((eta-etaC)*(eta-etaC)+ (phi-phiC)*(phi-phiC)); | |
191 | if(rad < fConeSize){ | |
192 | if(fillAOD) { | |
a3aebfff | 193 | refclusters->Add(calo); |
1c5acb87 | 194 | } |
477d6cee | 195 | //printf("neutral in isolation cone pt %f, phi %f, eta %f, R %f \n",pt,phi,eta,rad); |
196 | coneptsum+=pt; | |
197 | if(pt > fPtThreshold ) n++; | |
198 | if(pt > fPtFraction*ptC ) nfrac++; | |
199 | }//in cone | |
200 | }// neutral particle loop | |
201 | }//neutrals | |
202 | ||
203 | //printf("Isolation Cut: in cone with: pT>pTthres %d, pT > pTfrac*pTcandidate %d \n",n,nfrac); | |
204 | ||
a3aebfff | 205 | //Add reference arrays to AOD when filling AODs only |
206 | if(fillAOD) { | |
207 | if(refclusters->GetEntriesFast() > 0){ | |
208 | refclusters->SetName(aodArrayRefName+"Clusters"); | |
591cc579 | 209 | pCandidate->AddObjArray(refclusters); |
a3aebfff | 210 | } |
211 | if(reftracks->GetEntriesFast() > 0){ | |
212 | reftracks->SetName(aodArrayRefName+"Tracks"); | |
591cc579 | 213 | pCandidate->AddObjArray(reftracks); |
a3aebfff | 214 | } |
215 | } | |
216 | ||
477d6cee | 217 | //Check isolation, depending on method. |
218 | if( fICMethod == kPtThresIC){ | |
219 | if(n==0) isolated = kTRUE ; | |
220 | } | |
221 | else if( fICMethod == kSumPtIC){ | |
222 | if(coneptsum < fPtThreshold) | |
223 | isolated = kTRUE ; | |
224 | } | |
225 | else if( fICMethod == kPtFracIC){ | |
226 | if(nfrac==0) isolated = kTRUE ; | |
227 | } | |
228 | else if( fICMethod == kSumPtFracIC){ | |
229 | if(coneptsum < fPtFraction*ptC) | |
230 | isolated = kTRUE ; | |
231 | } | |
1c5acb87 | 232 | } |
233 | ||
234 | //__________________________________________________________________ | |
235 | void AliIsolationCut::Print(const Option_t * opt) const | |
236 | { | |
237 | ||
238 | //Print some relevant parameters set for the analysis | |
239 | if(! opt) | |
240 | return; | |
241 | ||
242 | printf("**** Print %s %s **** \n", GetName(), GetTitle() ) ; | |
243 | ||
244 | printf("IC method = %d\n", fICMethod) ; | |
245 | printf("Cone Size = %1.2f\n", fConeSize) ; | |
246 | printf("pT threshold = %2.1f\n", fPtThreshold) ; | |
247 | printf("pT fraction = %3.1f\n", fPtFraction) ; | |
248 | ||
249 | printf(" \n") ; | |
250 | ||
251 | } |