1 /**************************************************************************
2 * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
4 * Author: The ALICE Off-line Project. *
5 * Contributors are mentioned in the code where appropriate. *
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12 * about the suitability of this software for any purpose. It is *
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14 **************************************************************************/
17 //_________________________________________________________________________
18 // Class containing methods for the isolation cut.
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
24 //*-- Author: Gustavo Conesa (LNF-INFN)
25 //////////////////////////////////////////////////////////////////////////////
28 // --- ROOT system ---
29 //#include <Riostream.h>
30 #include <TLorentzVector.h>
31 #include <TObjArray.h>
33 // --- AliRoot system ---
34 #include "AliIsolationCut.h"
35 #include "AliAODPWG4ParticleCorrelation.h"
36 #include "AliAODTrack.h"
37 #include "AliAODCaloCluster.h"
39 ClassImp(AliIsolationCut)
41 //____________________________________________________________________________
42 AliIsolationCut::AliIsolationCut() :
44 fConeSize(0.),fPtThreshold(0.), fPtFraction(0.), fICMethod(0)
49 //Initialize parameters
54 //____________________________________________________________________________
55 AliIsolationCut::AliIsolationCut(const AliIsolationCut & g) :
57 fConeSize(g.fConeSize),
58 fPtThreshold(g.fPtThreshold),
59 fPtFraction(g.fPtFraction),
60 fICMethod(g.fICMethod)
66 //_________________________________________________________________________
67 AliIsolationCut & AliIsolationCut::operator = (const AliIsolationCut & source)
69 // assignment operator
71 if(&source == this) return *this;
73 fConeSize = source.fConeSize ;
74 fPtThreshold = source.fPtThreshold ;
75 fICMethod = source.fICMethod ;
76 fPtFraction = source.fPtFraction ;
82 //____________________________________________________________________________
83 TString AliIsolationCut::GetICParametersList()
85 //Put data member values in string to keep in output container
87 TString parList ; //this will be list of parameters used for this analysis.
90 sprintf(onePar,"--- AliIsolationCut ---\n") ;
92 sprintf(onePar,"fConeSize: (isolation cone size) %1.2f\n",fConeSize) ;
94 sprintf(onePar,"fPtThreshold =%1.2f (isolation pt threshold) \n",fPtThreshold) ;
96 sprintf(onePar,"fPtFraction=%1.2f (isolation pt threshold fraction ) \n",fPtFraction) ;
98 sprintf(onePar,"fICMethod=%d (isolation cut case) \n",fICMethod) ;
104 //____________________________________________________________________________
105 void AliIsolationCut::InitParameters()
107 //Initialize the parameters of the analysis.
113 fICMethod = kPtThresIC; // 0 pt threshol method, 1 cone pt sum method
117 //__________________________________________________________________
118 void AliIsolationCut::MakeIsolationCut(TObjArray * plCTS, TObjArray * plNe, Double_t * vertex,
119 const Bool_t fillAOD, AliAODPWG4ParticleCorrelation *pCandidate,
120 const TString aodArrayRefName,
121 Int_t & n, Int_t & nfrac, Float_t &coneptsum, Bool_t &isolated) const
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() ;
128 Float_t eta = -100. ;
129 Float_t phi = -100. ;
135 //Initialize the array with refrences
136 TObjArray * refclusters = 0x0;
137 TObjArray * reftracks =0x0;
140 refclusters = new TObjArray;
141 reftracks = new TObjArray;
144 //Check charged particles in cone.
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());
155 if(phi<0) phi+=TMath::TwoPi();
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));
162 reftracks->Add(track);
164 //printf("charged in isolation cone pt %f, phi %f, eta %f, R %f \n",pt,phi,eta,rad);
166 if(pt > fPtThreshold ) n++;
167 if(pt > fPtFraction*ptC ) nfrac++;
169 }// charged particle loop
172 //Check neutral particles in cone.
175 for(Int_t ipr = 0;ipr < plNe->GetEntries() ; ipr ++ ){
176 AliAODCaloCluster * calo = (AliAODCaloCluster *)(plNe->At(ipr)) ;
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
181 if(calo->GetNTracksMatched() > 0) continue ;
183 calo->GetMomentum(mom,vertex);//Assume that come from vertex in straight line
187 if(phi<0) phi+=TMath::TwoPi();
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));
193 refclusters->Add(calo);
195 //printf("neutral in isolation cone pt %f, phi %f, eta %f, R %f \n",pt,phi,eta,rad);
197 if(pt > fPtThreshold ) n++;
198 if(pt > fPtFraction*ptC ) nfrac++;
200 }// neutral particle loop
203 //printf("Isolation Cut: in cone with: pT>pTthres %d, pT > pTfrac*pTcandidate %d \n",n,nfrac);
205 //Add reference arrays to AOD when filling AODs only
207 if(refclusters->GetEntriesFast() > 0){
208 refclusters->SetName(aodArrayRefName+"Clusters");
209 pCandidate->AddObjArray(refclusters);
211 if(reftracks->GetEntriesFast() > 0){
212 reftracks->SetName(aodArrayRefName+"Tracks");
213 pCandidate->AddObjArray(reftracks);
217 //Check isolation, depending on method.
218 if( fICMethod == kPtThresIC){
219 if(n==0) isolated = kTRUE ;
221 else if( fICMethod == kSumPtIC){
222 if(coneptsum < fPtThreshold)
225 else if( fICMethod == kPtFracIC){
226 if(nfrac==0) isolated = kTRUE ;
228 else if( fICMethod == kSumPtFracIC){
229 if(coneptsum < fPtFraction*ptC)
234 //__________________________________________________________________
235 void AliIsolationCut::Print(const Option_t * opt) const
238 //Print some relevant parameters set for the analysis
242 printf("**** Print %s %s **** \n", GetName(), GetTitle() ) ;
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) ;