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 #ifndef ROOT_TMatrixDfwd
  29 #include <TMatrixDfwd.h>
  30 #endif
  31
  32 /**************************************************************************
  33 * Class Status see source file                                           *
  34 **************************************************************************/
  35
  36 class TFile;
  37 class TTreeSRedirector;
  38 class TClonesArray;
  39 class TLinearFitter;
  40
  41 class AliRieman;
  42 class AliESDEvent;
  43 class AliCluster;
  44 class AliTrackPoint;
  45
  46 class AliTRDcluster;
  47 class AliTRDseedV1;
  48 class AliTRDtrackingChamber;
  49 class AliTRDchamberTimeBin;
  50 class AliTRDtrackerFitter;
  51 class AliTRDtrackV1;
  52 class AliTRDReconstructor;
  53 class AliTRDtrackerV1 : public AliTracker
  54 {
  55 public:
  56   enum{
  57     kOwner            = BIT(14) // owner of clusters
  58    ,kRemoveContainers = BIT(15) // delete containers after usage
  59   };
  60   enum{
  61     kMaxLayersPerSector   = 1000
  62     , kMaxTimeBinIndex    = 216
  63     , kTrackingSectors    = 18
  64     , kNTimeBins          = 35
  65     , kNPlanes            = 6
  66     , kNSeedPlanes        = 4
  67     , kMaxTracksStack     = 100
  68     , kNConfigs           = 15
  69   };
  70   AliTRDtrackerV1(AliTRDReconstructor *rec = 0x0);
  71   virtual ~AliTRDtrackerV1();
  72
  73   //temporary
  74   AliTRDtrackingSector* GetTrackingSector(Int_t sec) {return &fTrSec[sec];}
  75
  76   Int_t           Clusters2Tracks(AliESDEvent *esd);
  77   AliCluster*     GetCluster(Int_t index) const;
  78   AliTRDseedV1*   GetTracklet(Int_t index) const;
  79   AliKalmanTrack* GetTrack(Int_t index) const;
  80   TClonesArray*   GetListOfClusters() const  { return fClusters;}
  81   TClonesArray*   GetListOfTracklets() const { return fTracklets;}
  82   TClonesArray*   GetListOfTracks() const    { return fTracks;}
  83   static Int_t    GetNTimeBins()             { return fgNTimeBins;}
  84   static void     GetExtrapolationConfig(Int_t iconfig, Int_t planes[2]);
  85   static void     GetSeedingConfig(Int_t iconfig, Int_t planes[4]);
  86   static TLinearFitter*  GetTiltedRiemanFitter();
  87   static TLinearFitter*  GetTiltedRiemanFitterConstraint();
  88   static AliRieman*      GetRiemanFitter();
  89   static void     FitRieman(AliTRDcluster **clusters, Double_t chi2[2]);
  90   static Float_t  FitRieman(AliTRDseedV1 *tracklets, Double_t *chi2, Int_t *planes = 0x0);
  91   static Float_t  FitTiltedRiemanConstraint(AliTRDseedV1 *tracklets, Double_t zVertex);
  92   static Float_t  FitTiltedRieman(AliTRDseedV1 *tracklets, Bool_t sigError);
  93   static Double_t FitTiltedRiemanV1(AliTRDseedV1 *tracklets);
  94
  95   static Double_t FitRiemanTilt(const AliTRDtrackV1 *trk, AliTRDseedV1 *tracklets = 0x0, Bool_t err=0, Int_t np = 0, AliTrackPoint *points = 0x0);
  96   static Double_t FitLine(const AliTRDtrackV1 *trk, AliTRDseedV1 *tracklets = 0x0, Bool_t err=0, Int_t np = 0, AliTrackPoint *points = 0x0);
  97   static Double_t FitKalman(AliTRDtrackV1 *trk, AliTRDseedV1 *tracklets = 0x0, Bool_t up=0, Int_t np = 0, AliTrackPoint *points = 0x0);
  98
  99   Bool_t          IsClustersOwner() const    { return TestBit(kOwner);}
 100   Bool_t          HasRemoveContainers() const    { return TestBit(kRemoveContainers);}
 101   void            SetClustersOwner(Bool_t own=kTRUE) {SetBit(kOwner, own); if(!own) fClusters = 0x0;}
 102   void            SetRemoveContainers(Bool_t rm=kTRUE) {SetBit(kRemoveContainers, rm);}
 103
 104   Int_t           FollowBackProlongation(AliTRDtrackV1 &t);
 105   Int_t           FollowProlongation(AliTRDtrackV1 &t);
 106   Int_t           LoadClusters(TTree *cTree);
 107   Int_t           LoadClusters(TClonesArray *clusters);
 108   Int_t           PropagateBack(AliESDEvent *event);
 109   static Int_t    PropagateToX(AliTRDtrackV1 &t, Double_t xToGo, Double_t maxStep);
 110   Int_t           ReadClusters(TClonesArray* &array, TTree *in) const;
 111   Int_t           RefitInward(AliESDEvent *event);
 112   static void     SetNTimeBins(Int_t nTimeBins){fgNTimeBins = nTimeBins; }
 113   void            SetReconstructor(const AliTRDReconstructor *rec){ fReconstructor = rec; }
 114   void            UnloadClusters();
 115
 116   class AliTRDLeastSquare{
 117   public:
 118     AliTRDLeastSquare();
 119     ~AliTRDLeastSquare(){};
 120
 121     void                AddPoint(Double_t *x, Double_t y, Double_t sigmaY);
 122     void                RemovePoint(Double_t *x, Double_t y, Double_t sigmaY);
 123     void                Eval();
 124     void    Reset();
 125
 126     Double_t    GetFunctionParameter(Int_t ParNumber) const {return fParams[ParNumber];}
 127     Double_t    GetFunctionValue(Double_t *xpos) const;
 128     void                GetCovarianceMatrix(Double_t *storage) const;
 129   private:
 130           AliTRDLeastSquare(const AliTRDLeastSquare &);
 131     AliTRDLeastSquare& operator=(const AliTRDLeastSquare &);
 132     Double_t    fParams[2];                                             // Fitparameter
 133     Double_t    fCovarianceMatrix[3];                   // Covariance Matrix
 134     Double_t    fSums[6];                                               // Sums
 135   };
 136
 137   class AliTRDtrackFitterRieman{
 138     public:
 139       AliTRDtrackFitterRieman();
 140       ~AliTRDtrackFitterRieman();
 141
 142       Double_t Eval();
 143       void Reset();
 144
 145       Double_t GetYat(Double_t x) const;
 146       Double_t GetDyDxAt(Double_t x) const;
 147       Double_t GetZat(Double_t x) const;
 148       Double_t GetDzDx() const { return fParameters[4]; };
 149       Double_t GetCurvature() const;
 150       void GetCovAt(Double_t x, Double_t *cov) const;
 151
 152       void SetRiemanFitter(TLinearFitter *fitter) { fTrackFitter = fitter; }
 153       void SetTracklet(Int_t il, AliTRDseedV1 *tracklet);
 154       void SetSysClusterError(Double_t err) { fSysClusterError = err; };
 155     private:
 156       AliTRDtrackFitterRieman(const AliTRDtrackFitterRieman &);
 157       AliTRDtrackFitterRieman &operator=(const AliTRDtrackFitterRieman &);
 158       void UpdateFitters(AliTRDseedV1 *tracklet);
 159       Bool_t CheckAcceptable(Double_t offset, Double_t slope);
 160       Double_t CalculateReferenceX();
 161
 162       TLinearFitter *fTrackFitter;        // Fitter for linearized track model
 163       AliTRDLeastSquare *fZfitter;        // Linear fitter in z-Direction
 164       AliTRDseedV1 *fTracklets[kNPlanes]; // Tracklet container
 165       TMatrixD *fCovarPolY;               // Polynomial Covariance Matrix Estimation (y-direction)
 166       TMatrixD *fCovarPolZ;               // Polynomial Covariance Matrix Estimation (z-direction)
 167       Double_t fXref;                     // Reference x position for fit in z-Direction
 168       Double_t fSysClusterError;          // Systematic cluster Error
 169       Double_t fParameters[5];            // Track Model Parameter
 170       Double_t fSumPolY[5];               // Sums for polynomial Covariance Matrix Estimation (y-direction)
 171       Double_t fSumPolZ[3];               // Sums for polynomial Covariance Matrix Estimation (z-direction)
 172   };
 173
 174 protected:
 175   static Bool_t  AdjustSector(AliTRDtrackV1 *track);
 176   Double_t       BuildSeedingConfigs(AliTRDtrackingChamber **stack, Int_t *configs);
 177   Int_t          BuildTrackingContainers();
 178   static Float_t CalculateChi2Z(AliTRDseedV1 *tracklets, Double_t offset, Double_t slope, Double_t xref);
 179   Int_t          Clusters2TracksSM(Int_t sector, AliESDEvent *esd);
 180   Int_t          Clusters2TracksStack(AliTRDtrackingChamber **stack, TClonesArray *esdTrackList);
 181   AliTRDseedV1*  GetTracklet(AliTRDtrackV1 *trk, Int_t plane, Int_t &idx);
 182   Bool_t         GetTrackPoint(Int_t index, AliTrackPoint &p) const;
 183   Float_t        GetR4Layer(Int_t ly) const { return fR[ly];}
 184   Int_t          MakeSeeds(AliTRDtrackingChamber **stack, AliTRDseedV1 *sseed, Int_t *ipar);
 185   AliTRDtrackV1* MakeTrack(AliTRDseedV1 *seeds, Double_t *params);
 186   AliTRDtrackV1* SetTrack(AliTRDtrackV1 *track);
 187   AliTRDseedV1*  SetTracklet(AliTRDseedV1 *tracklet);
 188
 189 private:
 190   AliTRDtrackerV1(const AliTRDtrackerV1 &tracker);
 191   AliTRDtrackerV1 &operator=(const AliTRDtrackerV1 &tracker);
 192   Double_t              CookLikelihood(AliTRDseedV1 *cseed, Int_t planes[4]);
 193   Double_t              CalculateTrackLikelihood(AliTRDseedV1 *tracklets, Double_t *chi2);
 194   Int_t                 ImproveSeedQuality(AliTRDtrackingChamber **stack, AliTRDseedV1 *tracklet);
 195   static Float_t        CalculateReferenceX(AliTRDseedV1 *tracklets);
 196   void        ResetSeedTB();
 197   Float_t     GetChi2Y(AliTRDseedV1 *tracklets) const;
 198   Float_t     GetChi2Z(AliTRDseedV1 *tracklets) const;
 199
 200 private:
 201   const AliTRDReconstructor *fReconstructor;            // reconstructor manager
 202   AliTRDgeometry      *fGeom;                           // Pointer to TRD geometry
 203   AliTRDtrackingSector fTrSec[kTrackingSectors];        // Array of tracking sectors;
 204   TClonesArray        *fClusters;                       // List of clusters
 205   TClonesArray        *fTracklets;                      // List of tracklets
 206   TClonesArray        *fTracks;                         // List of tracks
 207   Float_t              fR[kNPlanes];                    //! rough radial position of each TRD layer
 208
 209   // should go to the recoParam
 210   static const Double_t    fgkMaxChi2;                  // Max increment in track chi2
 211   static const Float_t     fgkMinClustersInTrack;       // Min number of clusters in track
 212   static const Float_t     fgkLabelFraction;            // Min fraction of same label
 213   static const Double_t    fgkMaxSnp;                   // Maximal snp for tracking
 214   static const Double_t    fgkMaxStep;                  // Maximal step for tracking
 215
 216   // stand alone tracking
 217   static Double_t      fgTopologicQA[kNConfigs];        //  Topologic quality
 218   Double_t             fTrackQuality[kMaxTracksStack];  //  Track quality
 219   Int_t                fSeedLayer[kMaxTracksStack];     //  Seed layer
 220   AliTRDchamberTimeBin *fSeedTB[kNSeedPlanes]; // seeding time bin planes
 221   Int_t                fSieveSeeding;                   //! Seeding iterator
 222
 223   static const Double_t fgkX0[kNPlanes];                // default values for the position of anode wire
 224   static Int_t         fgNTimeBins;                     // Timebins per plane in track prolongation
 225   static TLinearFitter *fgTiltedRieman;                 //  Fitter for the tilted Rieman fit without vertex constriant
 226   static TLinearFitter *fgTiltedRiemanConstrained;      //  Fitter for the tilted Rieman fit with vertex constraint
 227   static AliRieman     *fgRieman;                       //  Fitter for the untilted Rieman fit
 228
 229   ClassDef(AliTRDtrackerV1, 3)                          //  TRD tracker - tracklet based tracking
 230
 231 };
 232 #endif