1 /**************************************************************************
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4 * Author: The ALICE Off-line Project. *
5 * Contributors are mentioned in the code where appropriate. *
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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 "AliVCluster.h"
38 #include "AliCaloTrackReader.h"
39 #include "AliMixedEvent.h"
41 ClassImp(AliIsolationCut)
43 //____________________________________________________________________________
44 AliIsolationCut::AliIsolationCut() :
46 fConeSize(0.),fPtThreshold(0.), fPtFraction(0.), fICMethod(0),fPartInCone(0)
51 //Initialize parameters
56 //____________________________________________________________________________
57 AliIsolationCut::AliIsolationCut(const AliIsolationCut & g) :
59 fConeSize(g.fConeSize),
60 fPtThreshold(g.fPtThreshold),
61 fPtFraction(g.fPtFraction),
62 fICMethod(g.fICMethod)
68 //_________________________________________________________________________
69 AliIsolationCut & AliIsolationCut::operator = (const AliIsolationCut & source)
71 // assignment operator
73 if(&source == this) return *this;
75 fConeSize = source.fConeSize ;
76 fPtThreshold = source.fPtThreshold ;
77 fICMethod = source.fICMethod ;
78 fPtFraction = source.fPtFraction ;
84 //____________________________________________________________________________
85 TString AliIsolationCut::GetICParametersList()
87 //Put data member values in string to keep in output container
89 TString parList ; //this will be list of parameters used for this analysis.
90 const Int_t buffersize = 255;
91 char onePar[buffersize] ;
93 snprintf(onePar,buffersize,"--- AliIsolationCut ---\n") ;
95 snprintf(onePar,buffersize,"fConeSize: (isolation cone size) %1.2f\n",fConeSize) ;
97 snprintf(onePar,buffersize,"fPtThreshold =%1.2f (isolation pt threshold) \n",fPtThreshold) ;
99 snprintf(onePar,buffersize,"fPtFraction=%1.2f (isolation pt threshold fraction ) \n",fPtFraction) ;
101 snprintf(onePar,buffersize,"fICMethod=%d (isolation cut case) \n",fICMethod) ;
103 snprintf(onePar,buffersize,"fPartInCone=%d \n",fPartInCone) ;
109 //____________________________________________________________________________
110 void AliIsolationCut::InitParameters()
112 //Initialize the parameters of the analysis.
117 fPartInCone = kNeutralAndCharged;
118 fICMethod = kPtThresIC; // 0 pt threshol method, 1 cone pt sum method
122 //__________________________________________________________________
123 void AliIsolationCut::MakeIsolationCut(TObjArray * const plCTS, TObjArray * const plNe, AliCaloTrackReader * const reader,
124 const Bool_t fillAOD, AliAODPWG4ParticleCorrelation *pCandidate,
125 const TString aodArrayRefName,
126 Int_t & n, Int_t & nfrac, Float_t &coneptsum, Bool_t &isolated) const
128 //Search in cone around a candidate particle if it is isolated
129 Float_t phiC = pCandidate->Phi() ;
130 Float_t etaC = pCandidate->Eta() ;
131 Float_t ptC = pCandidate->Pt() ;
133 Float_t eta = -100. ;
134 Float_t phi = -100. ;
140 //Initialize the array with refrences
141 TObjArray * refclusters = 0x0;
142 TObjArray * reftracks = 0x0;
143 Int_t ntrackrefs = 0;
144 Int_t nclusterrefs = 0;
146 //Check charged particles in cone.
147 if(plCTS && (fPartInCone==kOnlyCharged || fPartInCone==kNeutralAndCharged)){
149 for(Int_t ipr = 0;ipr < plCTS->GetEntries() ; ipr ++ ){
150 AliAODTrack* track = (AliAODTrack *)(plCTS->At(ipr)) ;
151 //Do not count the candidate (pion, conversion photon) or the daughters of the candidate
152 if(track->GetID() == pCandidate->GetTrackLabel(0) || track->GetID() == pCandidate->GetTrackLabel(1)) continue ;
153 p3.SetXYZ(track->Px(),track->Py(),track->Pz());
157 if(phi<0) phi+=TMath::TwoPi();
159 //Check if there is any particle inside cone with pt larger than fPtThreshold
160 rad = TMath::Sqrt((eta-etaC)*(eta-etaC)+ (phi-phiC)*(phi-phiC));
166 reftracks = new TObjArray(0);
167 reftracks->SetName(aodArrayRefName+"Tracks");
168 reftracks->SetOwner(kFALSE);
170 reftracks->Add(track);
172 //printf("charged in isolation cone pt %f, phi %f, eta %f, R %f \n",pt,phi,eta,rad);
174 if(pt > fPtThreshold ) n++;
175 if(pt > fPtFraction*ptC ) nfrac++;
177 }// charged particle loop
180 //Check neutral particles in cone.
181 if(plNe && (fPartInCone==kOnlyNeutral || fPartInCone==kNeutralAndCharged)){
183 //Get vertex for photon momentum calculation
184 //Double_t vertex2[] = {0,0,0} ; //vertex second AOD input ;
185 //if(reader->GetDataType()!= AliCaloTrackReader::kMC)
187 //if(reader->GetSecondInputAODTree()) reader->GetSecondInputAODVertex(vertex2);
190 for(Int_t ipr = 0;ipr < plNe->GetEntries() ; ipr ++ ){
191 AliVCluster * calo = (AliVCluster *)(plNe->At(ipr)) ;
193 //Get the index where the cluster comes, to retrieve the corresponding vertex
195 if (reader->GetMixedEvent()) {
196 evtIndex=reader->GetMixedEvent()->EventIndexForCaloCluster(calo->GetID()) ;
199 //Do not count the candidate (photon or pi0) or the daughters of the candidate
200 if(calo->GetID() == pCandidate->GetCaloLabel(0) || calo->GetID() == pCandidate->GetCaloLabel(1)) continue ; //Skip matched clusters with tracks
202 if(calo->GetNTracksMatched() > 0) continue ;
204 //Input from second AOD?
206 // if (pCandidate->GetDetector() == "EMCAL" && reader->GetAODEMCALNormalInputEntries() <= ipr) input = 1 ;
207 // else if(pCandidate->GetDetector() == "PHOS" && reader->GetAODPHOSNormalInputEntries() <= ipr) input = 1;
209 //Get Momentum vector,
211 calo->GetMomentum(mom,reader->GetVertex(evtIndex)) ;//Assume that come from vertex in straight line
212 //else if(input == 1) calo->GetMomentum(mom,vertex2);//Assume that come from vertex in straight line
217 if(phi<0) phi+=TMath::TwoPi();
219 //Check if there is any particle inside cone with pt larger than fPtThreshold
220 rad = TMath::Sqrt((eta-etaC)*(eta-etaC)+ (phi-phiC)*(phi-phiC));
225 refclusters = new TObjArray(0);
226 refclusters->SetName(aodArrayRefName+"Clusters");
227 refclusters->SetOwner(kFALSE);
229 refclusters->Add(calo);
231 //printf("neutral in isolation cone pt %f, phi %f, eta %f, R %f \n",pt,phi,eta,rad);
233 if(pt > fPtThreshold ) n++;
234 if(pt > fPtFraction*ptC ) nfrac++;
236 }// neutral particle loop
239 //printf("Isolation Cut: in cone with: pT>pTthres %d, pT > pTfrac*pTcandidate %d \n",n,nfrac);
241 //Add reference arrays to AOD when filling AODs only
243 if(refclusters) pCandidate->AddObjArray(refclusters);
244 if(reftracks) pCandidate->AddObjArray(reftracks);
247 //Check isolation, depending on method.
248 if( fICMethod == kPtThresIC){
249 if(n==0) isolated = kTRUE ;
251 else if( fICMethod == kSumPtIC){
252 if(coneptsum < fPtThreshold)
255 else if( fICMethod == kPtFracIC){
256 if(nfrac==0) isolated = kTRUE ;
258 else if( fICMethod == kSumPtFracIC){
259 if(coneptsum < fPtFraction*ptC)
263 //if(refclusters) delete refclusters;
264 //if(reftracks) delete reftracks;
268 //__________________________________________________________________
269 void AliIsolationCut::Print(const Option_t * opt) const
272 //Print some relevant parameters set for the analysis
276 printf("**** Print %s %s **** \n", GetName(), GetTitle() ) ;
278 printf("IC method = %d\n", fICMethod) ;
279 printf("Cone Size = %1.2f\n", fConeSize) ;
280 printf("pT threshold = %2.1f\n", fPtThreshold) ;
281 printf("pT fraction = %3.1f\n", fPtFraction) ;
282 printf("particle type in cone = %d\n",fPartInCone);