TRD/AliTRDtrackerV1.h

   1 #ifndef ALITRDTRACKERV1_H
   2 #define ALITRDTRACKERV1_H
   3
   4 /* Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
   5 * See cxx source for full Copyright notice                               */
   6 /* $Id$ */
   7
   8 ////////////////////////////////////////////////////////////////////////////
   9 //                                                                        //
  10 //  The TRD tracker                                                       //
  11 //                                                                        //
  12 //  Authors:                                                              //
  13 //    Marian Ivanov <M.Ivanov@gsi.de>                                     //
  14 //    Alex Bercuci <A.Bercuci@gsi.de>                                     //
  15 //    Jouri Belikov <J.Belikov@cern.ch>                                   //
  16 //    Markus Fasel <M.Fasel@gsi.de>                                       //
  17 //                                                                        //
  18 ////////////////////////////////////////////////////////////////////////////
  19
  20 #ifndef ALITRACKER_H
  21 #include "AliTracker.h"
  22 #endif
  23
  24 #ifndef ALITRDTRACKINGSECTOR_H
  25 #include "AliTRDtrackingSector.h"
  26 #endif
  27
  28 /**************************************************************************
  29 * Class Status see source file                                           *
  30 **************************************************************************/
  31
  32 class TFile;
  33 class TTreeSRedirector;
  34 class TClonesArray;
  35 class TLinearFitter;
  36
  37 class AliRieman;
  38 class AliESDEvent;
  39 class AliCluster;
  40 class AliTrackPoint;
  41
  42 class AliTRDcluster;
  43 class AliTRDseedV1;
  44 class AliTRDtrackingChamber;
  45 class AliTRDchamberTimeBin;
  46 class AliTRDtrackerFitter;
  47 class AliTRDtrackV1;
  48 class AliTRDReconstructor;
  49 class AliTRDtrackerV1 : public AliTracker
  50 {
  51 public:
  52   enum{
  53     kOwner            = BIT(14) // owner of clusters
  54    ,kRemoveContainers = BIT(15) // delete containers after usage
  55   };
  56   enum{
  57     kMaxLayersPerSector   = 1000
  58     , kMaxTimeBinIndex    = 216
  59     , kTrackingSectors    = 18
  60     , kNTimeBins          = 35
  61     , kNPlanes            = 6
  62     , kNSeedPlanes        = 4
  63     , kMaxTracksStack     = 100
  64     , kNConfigs           = 15
  65   };
  66   AliTRDtrackerV1(AliTRDReconstructor *rec = 0x0);
  67   virtual ~AliTRDtrackerV1();
  68
  69   //temporary
  70   AliTRDtrackingSector* GetTrackingSector(Int_t sec) {return &fTrSec[sec];}
  71
  72   Int_t           Clusters2Tracks(AliESDEvent *esd);
  73   AliCluster*     GetCluster(Int_t index) const;
  74   AliTRDseedV1*   GetTracklet(Int_t index) const;
  75   AliKalmanTrack* GetTrack(Int_t index) const;
  76   TClonesArray*   GetListOfClusters() const  { return fClusters;}
  77   TClonesArray*   GetListOfTracklets() const { return fTracklets;}
  78   TClonesArray*   GetListOfTracks() const    { return fTracks;}
  79   static Int_t    GetNTimeBins()             { return fgNTimeBins;}
  80   static void     GetExtrapolationConfig(Int_t iconfig, Int_t planes[2]);
  81   static void     GetSeedingConfig(Int_t iconfig, Int_t planes[4]);
  82   static TLinearFitter*  GetTiltedRiemanFitter();
  83   static TLinearFitter*  GetTiltedRiemanFitterConstraint();
  84   static AliRieman*      GetRiemanFitter();
  85   static void     FitRieman(AliTRDcluster **clusters, Double_t chi2[2]);
  86   static Float_t  FitRieman(AliTRDseedV1 *tracklets, Double_t *chi2, Int_t *planes = 0x0);
  87   static Float_t  FitTiltedRiemanConstraint(AliTRDseedV1 *tracklets, Double_t zVertex);
  88   static Float_t  FitTiltedRieman(AliTRDseedV1 *tracklets, Bool_t sigError);
  89
  90   static Double_t FitRiemanTilt(const AliTRDtrackV1 *trk, AliTRDseedV1 *tracklets = 0x0, Bool_t err=0, Int_t np = 0, AliTrackPoint *points = 0x0);
  91   static Double_t FitLine(const AliTRDtrackV1 *trk, AliTRDseedV1 *tracklets = 0x0, Bool_t err=0, Int_t np = 0, AliTrackPoint *points = 0x0);
  92   static Double_t FitKalman(AliTRDtrackV1 *trk, AliTRDseedV1 *tracklets = 0x0, Bool_t up=0, Int_t np = 0, AliTrackPoint *points = 0x0);
  93
  94   Bool_t          IsClustersOwner() const    { return TestBit(kOwner);}
  95   Bool_t          HasRemoveContainers() const    { return TestBit(kRemoveContainers);}
  96   void            SetClustersOwner(Bool_t own=kTRUE) {SetBit(kOwner, own); if(!own) fClusters = 0x0;}
  97   void            SetRemoveContainers(Bool_t rm=kTRUE) {SetBit(kRemoveContainers, rm);}
  98
  99   Int_t           FollowBackProlongation(AliTRDtrackV1 &t);
 100   Int_t           FollowProlongation(AliTRDtrackV1 &t);
 101   Int_t           LoadClusters(TTree *cTree);
 102   Int_t           LoadClusters(TClonesArray *clusters);
 103   Int_t           PropagateBack(AliESDEvent *event);
 104   static Int_t    PropagateToX(AliTRDtrackV1 &t, Double_t xToGo, Double_t maxStep);
 105   Int_t           ReadClusters(TClonesArray* &array, TTree *in) const;
 106   Int_t           RefitInward(AliESDEvent *event);
 107   static void     SetNTimeBins(Int_t nTimeBins){fgNTimeBins = nTimeBins; }
 108   void            SetReconstructor(const AliTRDReconstructor *rec){ fReconstructor = rec; }
 109   void            UnloadClusters();
 110
 111   class AliTRDLeastSquare{
 112   public:
 113     AliTRDLeastSquare();
 114     ~AliTRDLeastSquare(){};
 115
 116     void                AddPoint(Double_t *x, Double_t y, Double_t sigmaY);
 117     void                RemovePoint(Double_t *x, Double_t y, Double_t sigmaY);
 118     void                Eval();
 119
 120     Double_t    GetFunctionParameter(Int_t ParNumber) const {return fParams[ParNumber];}
 121     Double_t    GetFunctionValue(Double_t *xpos) const;
 122     void                GetCovarianceMatrix(Double_t *storage) const;
 123   private:
 124           AliTRDLeastSquare(const AliTRDLeastSquare &);
 125     AliTRDLeastSquare& operator=(const AliTRDLeastSquare &);
 126     Double_t    fParams[2];                                             // Fitparameter
 127     Double_t    fCovarianceMatrix[3];                   // Covariance Matrix
 128     Double_t    fSums[6];                                               // Sums
 129   };
 130
 131 protected:
 132   static Bool_t  AdjustSector(AliTRDtrackV1 *track);
 133   Double_t       BuildSeedingConfigs(AliTRDtrackingChamber **stack, Int_t *configs);
 134   Int_t          BuildTrackingContainers();
 135   static Float_t CalculateChi2Z(AliTRDseedV1 *tracklets, Double_t offset, Double_t slope, Double_t xref);
 136   Int_t          Clusters2TracksSM(Int_t sector, AliESDEvent *esd);
 137   Int_t          Clusters2TracksStack(AliTRDtrackingChamber **stack, TClonesArray *esdTrackList);
 138   AliTRDseedV1*  GetTracklet(AliTRDtrackV1 *trk, Int_t plane, Int_t &idx);
 139   Bool_t         GetTrackPoint(Int_t index, AliTrackPoint &p) const;
 140   Float_t        GetR4Layer(Int_t ly) const { return fR[ly];}
 141   Int_t          MakeSeeds(AliTRDtrackingChamber **stack, AliTRDseedV1 *sseed, Int_t *ipar);
 142   AliTRDtrackV1* MakeTrack(AliTRDseedV1 *seeds, Double_t *params);
 143   AliTRDtrackV1* SetTrack(AliTRDtrackV1 *track);
 144   AliTRDseedV1*  SetTracklet(AliTRDseedV1 *tracklet);
 145
 146 private:
 147   AliTRDtrackerV1(const AliTRDtrackerV1 &tracker);
 148   AliTRDtrackerV1 &operator=(const AliTRDtrackerV1 &tracker);
 149   Double_t              CookLikelihood(AliTRDseedV1 *cseed, Int_t planes[4]);
 150   Double_t              CalculateTrackLikelihood(AliTRDseedV1 *tracklets, Double_t *chi2);
 151   Int_t                 ImproveSeedQuality(AliTRDtrackingChamber **stack, AliTRDseedV1 *tracklet);
 152   static Float_t        CalculateReferenceX(AliTRDseedV1 *tracklets);
 153   void        ResetSeedTB();
 154   Float_t     GetChi2Y(AliTRDseedV1 *tracklets) const;
 155   Float_t     GetChi2Z(AliTRDseedV1 *tracklets) const;
 156
 157 private:
 158   const AliTRDReconstructor *fReconstructor;            // reconstructor manager
 159   AliTRDgeometry      *fGeom;                           // Pointer to TRD geometry
 160   AliTRDtrackingSector fTrSec[kTrackingSectors];        // Array of tracking sectors;
 161   TClonesArray        *fClusters;                       // List of clusters
 162   TClonesArray        *fTracklets;                      // List of tracklets
 163   TClonesArray        *fTracks;                         // List of tracks
 164   Float_t              fR[kNPlanes];                    //! rough radial position of each TRD layer
 165
 166   // should go to the recoParam
 167   static const Double_t    fgkMaxChi2;                  // Max increment in track chi2
 168   static const Float_t     fgkMinClustersInTrack;       // Min number of clusters in track
 169   static const Float_t     fgkLabelFraction;            // Min fraction of same label
 170   static const Double_t    fgkMaxSnp;                   // Maximal snp for tracking
 171   static const Double_t    fgkMaxStep;                  // Maximal step for tracking
 172
 173   // stand alone tracking
 174   static Double_t      fgTopologicQA[kNConfigs];        //  Topologic quality
 175   Double_t             fTrackQuality[kMaxTracksStack];  //  Track quality
 176   Int_t                fSeedLayer[kMaxTracksStack];     //  Seed layer
 177   AliTRDchamberTimeBin *fSeedTB[kNSeedPlanes]; // seeding time bin planes
 178   Int_t                fSieveSeeding;                   //! Seeding iterator
 179
 180   static const Double_t fgkX0[kNPlanes];                // default values for the position of anode wire
 181   static Int_t         fgNTimeBins;                     // Timebins per plane in track prolongation
 182   static TLinearFitter *fgTiltedRieman;                 //  Fitter for the tilted Rieman fit without vertex constriant
 183   static TLinearFitter *fgTiltedRiemanConstrained;      //  Fitter for the tilted Rieman fit with vertex constraint
 184   static AliRieman     *fgRieman;                       //  Fitter for the untilted Rieman fit
 185
 186   ClassDef(AliTRDtrackerV1, 3)                          //  TRD tracker - tracklet based tracking
 187
 188 };
 189 #endif