TRD/AliTRDtracker.h

   1 #ifndef ALITRDTRACKER_H
   2 #define ALITRDTRACKER_H
   3
   4 /* Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
   5  * See cxx source for full Copyright notice                               */
   6
   7 /* $Id$ */
   8
   9 ////////////////////////////////////////////////////////////////////////////
  10 //                                                                        //
  11 //  The TRD tracker                                                       //
  12 //                                                                        //
  13 ////////////////////////////////////////////////////////////////////////////
  14
  15 #ifndef ROOT_TObjArray
  16 #include "TObjArray.h"
  17 #endif
  18
  19 #ifndef ALITRACKER_H
  20 #include "AliTracker.h"
  21 #endif
  22
  23 #ifndef ALITRDPROPAGATIONLAYER_H
  24 #include "AliTRDpropagationLayer.h"
  25 #endif
  26
  27 class TFile;
  28 class TTree;
  29 class TH1D;
  30 class TH2D;
  31 class TParticle;
  32 class TParticlePDG;
  33 class TTreeSRedirector;
  34
  35 class AliTRDgeometry;
  36 class AliTRDtrack;
  37 class AliTRDtracklet;
  38 class AliTRDcluster;
  39 class AliTRDseed;
  40 class AliESDEvent;
  41 class AliTRDpropagationLayer;
  42
  43 ///////////////////////////////////////////////////////////////////////////////
  44 //                                                                           //
  45 //  The standard TRD tracker                                                 //
  46 //  Based on Kalman filltering approach                                      //
  47 //                                                                           //
  48 ///////////////////////////////////////////////////////////////////////////////
  49
  50 class AliTRDtracker : public AliTracker {
  51
  52  public:
  53
  54   void InitLogHists();
  55   void SaveLogHists();
  56
  57   enum { kMaxLayersPerSector   = 1000
  58        , kMaxTimeBinIndex      = 216
  59        , kTrackingSectors      = 18   };
  60
  61   AliTRDtracker();
  62   AliTRDtracker(const AliTRDtracker &t);
  63   AliTRDtracker(const TFile *in);
  64   virtual         ~AliTRDtracker();
  65   AliTRDtracker   &operator=(const AliTRDtracker &/*t*/) { return *this;          }
  66
  67   void             SetAddTRDseeds()               { fAddTRDseeds = kTRUE;         }
  68   void             SetNoTilt()                    { fNoTilt      = kTRUE;         }
  69
  70   Int_t            GetTimeBinsPerPlane() const    { return fTimeBinsPerPlane;     }
  71   Double_t         GetMaxChi2() const             { return fgkMaxChi2;            }
  72   Float_t          GetLabelFraction() const       { return fgkLabelFraction;      }
  73   Float_t          GetMinClustersInTrack() const  { return fgkMinClustersInTrack; }
  74   Int_t            GetLastPlane(AliTRDtrack *track);
  75   Double_t         GetTiltFactor(const AliTRDcluster *c);
  76   virtual Bool_t   GetTrackPoint(Int_t index, AliTrackPoint& p) const;
  77   Double_t         GetX(Int_t sec, Int_t plane, Int_t localTB) const;
  78   Double_t         GetX(Int_t sec, Int_t pl) const
  79                                                   { return fTrSec[sec]->GetLayer(pl)->GetX();            }
  80   Int_t            GetGlobalTimeBin(Int_t sec, Int_t plane, Int_t localTB) const
  81                                                   { return fTrSec[sec]->CookTimeBinIndex(plane,localTB); }
  82   Double_t         GetLayerNumber(Int_t sec, Double_t x) const
  83                                                   { return fTrSec[sec]->GetLayerNumber(x);               }
  84   AliCluster      *GetCluster(Int_t index) const  { if (index >= fNclusters) return NULL;
  85                                                     return (AliCluster *) fClusters->UncheckedAt(index); }
  86
  87   static Int_t     Freq(Int_t n, const Int_t *inlist, Int_t *outlist, Bool_t down);
  88   Int_t            Clusters2Tracks(AliESDEvent *event);
  89   Int_t            PropagateBack(AliESDEvent *event);
  90   Int_t            RefitInward(AliESDEvent *event);
  91
  92   virtual void     CookLabel(AliKalmanTrack *t, Float_t wrong) const;
  93
  94   Int_t            LocalToGlobalID(Int_t lid);
  95   Int_t            GlobalToLocalID(Int_t gid);
  96
  97   Int_t            LoadClusters(TTree *cTree);
  98   void             UnloadClusters();
  99   virtual void     UseClusters(const AliKalmanTrack *t, Int_t from = 0) const;
 100   Int_t            ReadClusters(TObjArray *array, TTree *in) const;
 101   AliTRDcluster   *GetCluster(AliTRDtrack *track, Int_t plane, Int_t timebin, UInt_t &index);
 102   Int_t            FindClusters(Int_t sector, Int_t t0, Int_t t1, AliTRDtrack *track
 103                               , Int_t *clusters, AliTRDtracklet &tracklet);
 104
 105  protected:
 106
 107   Bool_t           AdjustSector(AliTRDtrack *track);
 108   AliTRDtrack     *RegisterSeed(AliTRDseed *seeds, Double_t *params);
 109   Int_t            FollowBackProlongation(AliTRDtrack &t);
 110   //void             MakeSeedsMI(Int_t inner, Int_t outer, AliESDEvent *esd = 0);
 111
 112  protected:
 113
 114   //__________________________________________________________________________________________________
 115   class AliTRDtrackingSector {
 116
 117    public:
 118
 119     AliTRDtrackingSector(AliTRDgeometry* geo, Int_t gs);
 120     AliTRDtrackingSector(const AliTRDtrackingSector &/*t*/);
 121     ~AliTRDtrackingSector();
 122
 123     AliTRDtrackingSector &operator=(const AliTRDtrackingSector &/*t*/) { return *this; }
 124
 125     Int_t    GetNumberOfLayers() const             { return fN; }
 126     Int_t    GetNumberOfTimeBins() const;
 127     Int_t    GetLayerNumber(Double_t x) const;
 128     Int_t    GetInnerTimeBin() const;
 129     Int_t    GetOuterTimeBin() const;
 130     Int_t    GetLayerNumber(Int_t tb) const        { return fTimeBinIndex[tb];   }
 131     Double_t GetX(Int_t pl) const                  { return fLayers[pl]->GetX(); }
 132     AliTRDpropagationLayer* GetLayer(Int_t i)      { return fLayers[i];          }
 133     Int_t    GetSector() const {return fGeomSector;}
 134
 135     void     MapTimeBinLayers();
 136     Int_t    Find(Double_t x) const;
 137     void     InsertLayer(AliTRDpropagationLayer *pl);
 138     Int_t    CookTimeBinIndex(Int_t plane, Int_t localTB) const;
 139
 140    private:
 141
 142     Int_t                   fN;                              // Total number of layers
 143     AliTRDgeometry         *fGeom;                           // Geometry
 144     AliTRDpropagationLayer *fLayers[kMaxLayersPerSector];    // Layers
 145     Int_t                   fTimeBinIndex[kMaxTimeBinIndex]; // Time bin index
 146     Int_t                   fGeomSector;                     // Sector# in AliTRDgeometry
 147
 148   };
 149
 150  protected:
 151
 152   AliTRDgeometry          *fGeom;                          // Pointer to TRD geometry
 153   AliTRDtrackingSector    *fTrSec[kTrackingSectors];       // Array of tracking sectors;
 154   Int_t                    fNclusters;                     // Number of clusters in TRD
 155   TObjArray               *fClusters;                      // List of clusters for all sectors
 156   Int_t                    fNseeds;                        // Number of track seeds
 157   TObjArray               *fSeeds;                         // List of track seeds
 158   Int_t                    fNtracks;                       // Number of reconstructed tracks
 159   TObjArray               *fTracks;                        // List of reconstructed tracks
 160   Int_t                    fTimeBinsPerPlane;              // Timebins per plane in track prolongation
 161
 162   static const Double_t    fgkMaxChi2;                     // Max increment in track chi2
 163   static const Float_t     fgkMinClustersInTrack;          // Min number of clusters in track
 164   static const Float_t     fgkLabelFraction;               // Min fraction of same label
 165   static const Double_t    fgkMaxSnp;                      // Maximal snp for tracking
 166   static const Double_t    fgkMaxStep;                     // Maximal step for tracking
 167
 168   Bool_t                   fAddTRDseeds;                   // Something else
 169   Bool_t                   fNoTilt;                        // No tilt, or what?
 170
 171   // Histograms
 172   TH1D                    *fHBackfit;                      // QA histogram
 173   TH1D                    *fHClSearch;                     // QA histogram
 174   TH1D                    *fHRefit;                        // QA histogram
 175   TH1D                    *fHX;                            // QA histogram
 176   TH1D                    *fHNCl;                          // QA histogram
 177   TH1D                    *fHNClTrack;                     // QA histogram
 178   TH1D                    *fHFindCl[4];                    // QA histogram
 179   TH1D                    *fHMinYPos;                      // QA histogram
 180   TH1D                    *fHMinYNeg;                      // QA histogram
 181   TH1D                    *fHMinZ;                         // QA histogram
 182   TH2D                    *fHMinD;                         // QA histogram
 183   TH1D                    *fHDeltaX;                       // QA histogram
 184   TH1D                    *fHXCl;                          // QA histogram
 185
 186  protected:
 187
 188   Int_t            FollowProlongation(AliTRDtrack &t);
 189   Int_t            PropagateToX(AliTRDtrack &t, Double_t xToGo, Double_t maxStep);
 190   Double_t         ExpectedSigmaY2(Double_t r, Double_t tgl, Double_t pt) const;
 191   Double_t         ExpectedSigmaZ2(Double_t r, Double_t tgl) const;
 192
 193
 194   TTreeSRedirector        *fDebugStreamer;                 //!Debug streamer
 195
 196   ClassDef(AliTRDtracker, 4)                               // TRD tracker
 197
 198 };
 199
 200
 201 #endif