PWGLF/totEt/AliAnalysisEtSelectorEmcal.cxx

   1 //_________________________________________________________________________
   2 //  Utility Class for transverse energy studies
   3 //  Selection class for EMCAL
   4 //
   5 //*-- Authors: Oystein Djuvsland (Bergen)
   6 //_________________________________________________________________________
   7
   8
   9 #include "AliAnalysisEtSelectorEmcal.h"
  10 #include "AliAnalysisEtCuts.h"
  11 #include "AliEMCALTrack.h"
  12 #include "TParticle.h"
  13
  14 AliAnalysisEtSelectorEmcal::AliAnalysisEtSelectorEmcal(AliAnalysisEtCuts* cuts):AliAnalysisEtSelector(cuts)
  15 {
  16
  17 }
  18 AliAnalysisEtSelectorEmcal::AliAnalysisEtSelectorEmcal():AliAnalysisEtSelector()
  19 {
  20 }
  21
  22 AliAnalysisEtSelectorEmcal::~AliAnalysisEtSelectorEmcal()
  23 {
  24
  25 }
  26
  27 void AliAnalysisEtSelectorEmcal::Init()
  28 {
  29     AliAnalysisEtSelector::Init();
  30 }
  31
  32 Int_t AliAnalysisEtSelectorEmcal::Init(const AliESDEvent* event)
  33 {   // Init
  34
  35     AliAnalysisEtSelector::Init(event);
  36     Printf("Initializing selector for run: %d", event->GetRunNumber());
  37     fInitialized = kTRUE;
  38     return 0;
  39 }
  40
  41 TRefArray* AliAnalysisEtSelectorEmcal::GetClusters()
  42 {   // Get clusters
  43
  44     if(!fClusterArray) fClusterArray = new TRefArray;
  45
  46     if(fClusterArray)
  47     {
  48         fEvent->GetEMCALClusters(fClusterArray);
  49     }
  50     else
  51     {
  52         Printf("Could not initialize cluster array");
  53     }
  54     return fClusterArray;
  55 }
  56
  57 Bool_t AliAnalysisEtSelectorEmcal::PassMinEnergyCut(const AliESDCaloCluster& cl) const
  58 {
  59   Float_t pos[3];
  60   cl.GetPosition(pos);
  61   TVector3 cp(pos);
  62   return TMath::Sin(cp.Theta())*cl.E() > fCuts->GetReconstructedEmcalClusterEnergyCut();
  63 }
  64
  65 Bool_t AliAnalysisEtSelectorEmcal::PassMinEnergyCut(const TParticle& p) const
  66 {
  67   return TMath::Sin(p.Theta())*p.Energy() > fCuts->GetReconstructedEmcalClusterEnergyCut();
  68 }
  69
  70 Bool_t AliAnalysisEtSelectorEmcal::PassDistanceToBadChannelCut(const AliESDCaloCluster& ) const
  71 {
  72     return kTRUE;
  73 }
  74
  75 Bool_t AliAnalysisEtSelectorEmcal::PassTrackMatchingCut(const AliESDCaloCluster& cluster) const
  76 {
  77
  78   Int_t nTracksMatched = cluster.GetNTracksMatched();
  79   if(nTracksMatched == 0){
  80     return kTRUE;
  81   }
  82
  83   Int_t trackMatchedIndex = cluster.GetTrackMatchedIndex();
  84   if(trackMatchedIndex < 0){
  85     return kTRUE;
  86   }
  87   AliVParticle *track = fEvent->GetTrack(trackMatchedIndex);
  88   if(track->Pt()<0.5) return kTRUE;//Track matches below about 500 MeV are mostly random.  It takes ~460 MeV to reach the EMCal
  89
  90   //Float_t recoE = cluster.E();
  91   //Float_t pos[3];
  92
  93 //     //cluster.GetPosition(pos);
  94 //     Int_t trackMatchIdx = cluster.GetTrackMatchedIndex();
  95 //     //Double_t distance = 9999.0;
  96 //     if(trackMatchIdx>-1)
  97 //     {
  98 //       return kTRUE;
  99 //       //distance = CalcTrackClusterDistance(pos, &trackMatchIdx);
 100 //     }
 101
 102
 103     return kFALSE;
 104     //return distance > fCuts->GetEmcalTrackDistanceCut();
 105 }
 106
 107 Bool_t AliAnalysisEtSelectorEmcal::CutGeometricalAcceptance(const TParticle& part) const
 108 {
 109     return TMath::Abs(part.Eta()) < fCuts->GetGeometryEmcalEtaAccCut()
 110            && part.Phi() < fCuts->GetGeometryEmcalPhiAccMaxCut()*TMath::Pi()/180.
 111            && part.Phi() > fCuts->GetGeometryEmcalPhiAccMinCut()*TMath::Pi()/180.;
 112 }
 113
 114 Bool_t AliAnalysisEtSelectorEmcal::CutGeometricalAcceptance(const AliVTrack& part) const
 115 {
 116     return TMath::Abs(part.Eta()) < fCuts->GetGeometryEmcalEtaAccCut()
 117            && part.Phi() < fCuts->GetGeometryEmcalPhiAccMaxCut()*TMath::Pi()/180.
 118            && part.Phi() > fCuts->GetGeometryEmcalPhiAccMinCut()*TMath::Pi()/180.;
 119 }
 120
 121
 122 Double_t
 123 AliAnalysisEtSelectorEmcal::CalcTrackClusterDistance(const Float_t clsPos[3],Int_t *trkMatchId) const
 124 {   // calculate distance between cluster and closest track
 125
 126     Double_t trkPos[3] = {0,0,0};
 127
 128     Int_t bestTrkMatchId = -1;
 129     Double_t distance = 9999; // init to a big number
 130
 131     Double_t dist = 0;
 132     Double_t distX = 0, distY = 0, distZ = 0;
 133
 134     for (Int_t iTrack = 0; iTrack < fEvent->GetNumberOfTracks(); iTrack++) {
 135         AliESDtrack *track = static_cast<AliESDtrack*>( fEvent->GetTrack(iTrack) );
 136         if (!track) {
 137             AliError(Form("ERROR: Could not get track %d", iTrack));
 138             continue;
 139         }
 140
 141         // check for approx. eta and phi range before we propagate..
 142         // TBD
 143
 144         AliEMCALTrack emctrack(*track);
 145         if (!emctrack.PropagateToGlobal(clsPos[0],clsPos[1],clsPos[2],0.,0.) ) {
 146             continue;
 147         }
 148         emctrack.GetXYZ(trkPos);
 149
 150         distX = clsPos[0]-trkPos[0];
 151         distY = clsPos[1]-trkPos[1];
 152         distZ = clsPos[2]-trkPos[2];
 153         dist = TMath::Sqrt(distX*distX + distY*distY + distZ*distZ);
 154
 155         if (dist < distance) {
 156             distance = dist;
 157             bestTrkMatchId = iTrack;
 158         }
 159     } // iTrack
 160
 161     // printf("CalcTrackClusterDistance: bestTrkMatch %d origTrkMatch %d distance %f\n", bestTrkMatchId, *trkMatchId, distance);
 162     *trkMatchId = bestTrkMatchId;
 163     return distance;
 164 }
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