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4 * Author: The ALICE Off-line Project. *
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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"
38 #include "AliCaloTrackReader.h"
40 ClassImp(AliIsolationCut)
42 //____________________________________________________________________________
43 AliIsolationCut::AliIsolationCut() :
45 fConeSize(0.),fPtThreshold(0.), fPtFraction(0.), fICMethod(0)
50 //Initialize parameters
55 //____________________________________________________________________________
56 AliIsolationCut::AliIsolationCut(const AliIsolationCut & g) :
58 fConeSize(g.fConeSize),
59 fPtThreshold(g.fPtThreshold),
60 fPtFraction(g.fPtFraction),
61 fICMethod(g.fICMethod)
67 //_________________________________________________________________________
68 AliIsolationCut & AliIsolationCut::operator = (const AliIsolationCut & source)
70 // assignment operator
72 if(&source == this) return *this;
74 fConeSize = source.fConeSize ;
75 fPtThreshold = source.fPtThreshold ;
76 fICMethod = source.fICMethod ;
77 fPtFraction = source.fPtFraction ;
83 //____________________________________________________________________________
84 TString AliIsolationCut::GetICParametersList()
86 //Put data member values in string to keep in output container
88 TString parList ; //this will be list of parameters used for this analysis.
91 sprintf(onePar,"--- AliIsolationCut ---\n") ;
93 sprintf(onePar,"fConeSize: (isolation cone size) %1.2f\n",fConeSize) ;
95 sprintf(onePar,"fPtThreshold =%1.2f (isolation pt threshold) \n",fPtThreshold) ;
97 sprintf(onePar,"fPtFraction=%1.2f (isolation pt threshold fraction ) \n",fPtFraction) ;
99 sprintf(onePar,"fICMethod=%d (isolation cut case) \n",fICMethod) ;
105 //____________________________________________________________________________
106 void AliIsolationCut::InitParameters()
108 //Initialize the parameters of the analysis.
114 fICMethod = kPtThresIC; // 0 pt threshol method, 1 cone pt sum method
118 //__________________________________________________________________
119 void AliIsolationCut::MakeIsolationCut(TObjArray * const plCTS, TObjArray * const plNe, AliCaloTrackReader * const reader,
120 const Bool_t fillAOD, AliAODPWG4ParticleCorrelation *pCandidate,
121 const TString aodArrayRefName,
122 Int_t & n, Int_t & nfrac, Float_t &coneptsum, Bool_t &isolated) const
124 //Search in cone around a candidate particle if it is isolated
125 Float_t phiC = pCandidate->Phi() ;
126 Float_t etaC = pCandidate->Eta() ;
127 Float_t ptC = pCandidate->Pt() ;
129 Float_t eta = -100. ;
130 Float_t phi = -100. ;
136 //Initialize the array with refrences
137 TObjArray * refclusters = 0x0;
138 TObjArray * reftracks =0x0;
141 refclusters = new TObjArray;
142 reftracks = new TObjArray;
145 //Check charged particles in cone.
148 for(Int_t ipr = 0;ipr < plCTS->GetEntries() ; ipr ++ ){
149 AliAODTrack* track = (AliAODTrack *)(plCTS->At(ipr)) ;
150 //Do not count the candidate (pion, conversion photon) or the daughters of the candidate
151 if(track->GetID() == pCandidate->GetTrackLabel(0) || track->GetID() == pCandidate->GetTrackLabel(1)) continue ;
152 p3.SetXYZ(track->Px(),track->Py(),track->Pz());
156 if(phi<0) phi+=TMath::TwoPi();
158 //Check if there is any particle inside cone with pt larger than fPtThreshold
159 rad = TMath::Sqrt((eta-etaC)*(eta-etaC)+ (phi-phiC)*(phi-phiC));
163 reftracks->Add(track);
165 //printf("charged in isolation cone pt %f, phi %f, eta %f, R %f \n",pt,phi,eta,rad);
167 if(pt > fPtThreshold ) n++;
168 if(pt > fPtFraction*ptC ) nfrac++;
170 }// charged particle loop
173 //Check neutral particles in cone.
176 //Get vertex for photon momentum calculation
177 Double_t vertex[] = {0,0,0} ; //vertex ;
178 Double_t vertex2[] = {0,0,0} ; //vertex second AOD input ;
179 if(!reader->GetDataType()== AliCaloTrackReader::kMC)
181 reader->GetVertex(vertex);
182 if(reader->GetSecondInputAODTree()) reader->GetSecondInputAODVertex(vertex2);
185 for(Int_t ipr = 0;ipr < plNe->GetEntries() ; ipr ++ ){
186 AliAODCaloCluster * calo = (AliAODCaloCluster *)(plNe->At(ipr)) ;
188 //Do not count the candidate (photon or pi0) or the daughters of the candidate
189 if(calo->GetID() == pCandidate->GetCaloLabel(0) || calo->GetID() == pCandidate->GetCaloLabel(1)) continue ; //Skip matched clusters with tracks
191 if(calo->GetNTracksMatched() > 0) continue ;
192 //Input from second AOD?
194 if (pCandidate->GetDetector() == "EMCAL" && reader->GetAODEMCALNormalInputEntries() <= ipr) input = 1 ;
195 else if(pCandidate->GetDetector() == "PHOS" && reader->GetAODPHOSNormalInputEntries() <= ipr) input = 1;
197 //Get Momentum vector,
198 if (input == 0) calo->GetMomentum(mom,vertex) ;//Assume that come from vertex in straight line
199 else if(input == 1) calo->GetMomentum(mom,vertex2);//Assume that come from vertex in straight line
204 if(phi<0) phi+=TMath::TwoPi();
206 //Check if there is any particle inside cone with pt larger than fPtThreshold
207 rad = TMath::Sqrt((eta-etaC)*(eta-etaC)+ (phi-phiC)*(phi-phiC));
210 refclusters->Add(calo);
212 //printf("neutral in isolation cone pt %f, phi %f, eta %f, R %f \n",pt,phi,eta,rad);
214 if(pt > fPtThreshold ) n++;
215 if(pt > fPtFraction*ptC ) nfrac++;
217 }// neutral particle loop
220 //printf("Isolation Cut: in cone with: pT>pTthres %d, pT > pTfrac*pTcandidate %d \n",n,nfrac);
222 //Add reference arrays to AOD when filling AODs only
224 if(refclusters->GetEntriesFast() > 0){
225 refclusters->SetName(aodArrayRefName+"Clusters");
226 pCandidate->AddObjArray(refclusters);
228 if(reftracks->GetEntriesFast() > 0){
229 reftracks->SetName(aodArrayRefName+"Tracks");
230 pCandidate->AddObjArray(reftracks);
234 //Check isolation, depending on method.
235 if( fICMethod == kPtThresIC){
236 if(n==0) isolated = kTRUE ;
238 else if( fICMethod == kSumPtIC){
239 if(coneptsum < fPtThreshold)
242 else if( fICMethod == kPtFracIC){
243 if(nfrac==0) isolated = kTRUE ;
245 else if( fICMethod == kSumPtFracIC){
246 if(coneptsum < fPtFraction*ptC)
251 //__________________________________________________________________
252 void AliIsolationCut::Print(const Option_t * opt) const
255 //Print some relevant parameters set for the analysis
259 printf("**** Print %s %s **** \n", GetName(), GetTitle() ) ;
261 printf("IC method = %d\n", fICMethod) ;
262 printf("Cone Size = %1.2f\n", fConeSize) ;
263 printf("pT threshold = %2.1f\n", fPtThreshold) ;
264 printf("pT fraction = %3.1f\n", fPtFraction) ;