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 AliTRDrecoParam;
  54 class AliTRDtrackerV1 : public AliTracker
  55 {
  56 public:
  57   enum{
  58     kOwner            = BIT(14) // owner of clusters
  59    ,kRemoveContainers = BIT(15) // delete containers after usage
  60   };
  61   enum ETRDtrackerV1const {
  62     kMaxLayersPerSector   = 1000
  63     , kMaxTimeBinIndex    = 216
  64     , kTrackingSectors    = 18
  65     , kNTimeBins          = 35
  66     , kNPlanes            = 6
  67     , kNSeedPlanes        = 4
  68     , kMaxTracksStack     = 100
  69     , kNConfigs           = 15
  70   };
  71   enum ETRDtrackerV1BetheBloch {
  72      kGeant = 0
  73     ,kSolid
  74     ,kGas
  75   };
  76   AliTRDtrackerV1(const AliTRDReconstructor *rec = NULL);
  77   virtual ~AliTRDtrackerV1();
  78
  79   //temporary
  80   AliTRDtrackingSector* GetTrackingSector(Int_t sec) {return &fTrSec[sec];}
  81
  82   Int_t           Clusters2Tracks(AliESDEvent *esd);
  83   static ETRDtrackerV1BetheBloch
  84                   GetBetheBloch()            { return fgBB;}
  85   AliCluster*     GetCluster(Int_t index) const;
  86   AliTRDseedV1*   GetTracklet(Int_t index) const;
  87   AliKalmanTrack* GetTrack(Int_t index) const;
  88   TClonesArray*   GetListOfClusters() const  { return fClusters;}
  89   TClonesArray*   GetListOfTracklets() const { return fTracklets;}
  90   TClonesArray*   GetListOfTracks() const    { return fTracks;}
  91   static Int_t    GetNTimeBins()             { return fgNTimeBins;}
  92   static void     GetExtrapolationConfig(Int_t iconfig, Int_t planes[2]);
  93   static void     GetSeedingConfig(Int_t iconfig, Int_t planes[4]);
  94
  95   static TLinearFitter*  GetTiltedRiemanFitter();
  96   static TLinearFitter*  GetTiltedRiemanFitterConstraint();
  97   static AliRieman*      GetRiemanFitter();
  98   static void     FitRieman(AliTRDcluster **clusters, Double_t chi2[2]);
  99   static Float_t  FitRieman(AliTRDseedV1 *tracklets, Double_t *chi2, Int_t *const planes = NULL);
 100   static Float_t  FitTiltedRiemanConstraint(AliTRDseedV1 *tracklets, Double_t zVertex);
 101   static Float_t  FitTiltedRieman(AliTRDseedV1 *tracklets, Bool_t sigError);
 102   static Double_t FitTiltedRiemanV1(AliTRDseedV1 *tracklets);
 103
 104   static Double_t FitRiemanTilt(const AliTRDtrackV1 *trk, AliTRDseedV1 *tracklets = NULL, Bool_t err=0, Int_t np = 0, AliTrackPoint *points = NULL);
 105   static Double_t FitLine(const AliTRDtrackV1 *trk, AliTRDseedV1 *tracklets = NULL, Bool_t err=0, Int_t np = 0, AliTrackPoint *points = NULL);
 106   static Double_t FitKalman(AliTRDtrackV1 *trk, AliTRDseedV1 * const tracklets = NULL, Bool_t up=0, Int_t np = 0, AliTrackPoint *points = NULL);
 107
 108   Bool_t          IsClustersOwner() const    { return TestBit(kOwner);}
 109   Bool_t          HasRemoveContainers() const    { return TestBit(kRemoveContainers);}
 110
 111   static void     SetBetheBloch(ETRDtrackerV1BetheBloch bb) {fgBB = bb;}
 112   void            SetClustersOwner(Bool_t own=kTRUE) {SetBit(kOwner, own); if(!own) fClusters = NULL;}
 113   void            SetRemoveContainers(Bool_t rm=kTRUE) {SetBit(kRemoveContainers, rm);}
 114
 115   Int_t           FollowBackProlongation(AliTRDtrackV1 &t);
 116   Int_t           FollowProlongation(AliTRDtrackV1 &t);
 117   Int_t           LoadClusters(TTree *cTree);
 118   Int_t           LoadClusters(TClonesArray *const clusters);
 119   Int_t           PropagateBack(AliESDEvent *event);
 120   static Int_t    PropagateToX(AliTRDtrackV1 &t, Double_t xToGo, Double_t maxStep);
 121   Bool_t          ReadClusters(TTree *in);
 122   Int_t           RefitInward(AliESDEvent *event);
 123   static void     SetNTimeBins(Int_t nTimeBins){fgNTimeBins = nTimeBins; }
 124   void            SetReconstructor(const AliTRDReconstructor *rec) {fkReconstructor = rec;}
 125   void            UnloadClusters();
 126
 127   class AliTRDLeastSquare{
 128   public:
 129     AliTRDLeastSquare();
 130     ~AliTRDLeastSquare(){};
 131
 132     void          AddPoint(const Double_t * const x, Double_t y, Double_t sigmaY);
 133     void          RemovePoint(const Double_t * const x, Double_t y, Double_t sigmaY);
 134     Bool_t        Eval();
 135     void          Reset();
 136
 137     Double_t      GetFunctionParameter(Int_t ParNumber) const {return fParams[ParNumber];}
 138     Double_t      GetFunctionValue(const Double_t * const xpos) const;
 139     void          GetCovarianceMatrix(Double_t *storage) const;
 140   private:
 141     AliTRDLeastSquare(const AliTRDLeastSquare &);
 142     AliTRDLeastSquare& operator=(const AliTRDLeastSquare &);
 143     Double_t      fParams[2];           // Fitparameter
 144     Double_t      fCovarianceMatrix[3]; // Covariance Matrix
 145     Double_t      fSums[6];             // Sums
 146   };
 147
 148   class AliTRDtrackFitterRieman{
 149     public:
 150       AliTRDtrackFitterRieman();
 151       ~AliTRDtrackFitterRieman();
 152
 153       Double_t Eval();
 154       void Reset();
 155
 156       Double_t GetYat(Double_t x) const;
 157       Double_t GetDyDxAt(Double_t x) const;
 158       Double_t GetZat(Double_t x) const;
 159       Double_t GetDzDx() const { return fParameters[4]; };
 160       Double_t GetCurvature() const;
 161       void GetCovAt(Double_t x, Double_t *cov) const;
 162
 163       void SetRiemanFitter(TLinearFitter *const fitter) { fTrackFitter = fitter; }
 164       void SetTracklet(Int_t il, AliTRDseedV1 * const tracklet);
 165       void SetSysClusterError(Double_t err) { fSysClusterError = err; };
 166     private:
 167       AliTRDtrackFitterRieman(const AliTRDtrackFitterRieman &);
 168       AliTRDtrackFitterRieman &operator=(const AliTRDtrackFitterRieman &);
 169       void UpdateFitters(const AliTRDseedV1 * const tracklet);
 170       Bool_t CheckAcceptable(Double_t offset, Double_t slope);
 171       Double_t CalculateReferenceX();
 172
 173       TLinearFitter *fTrackFitter;        // Fitter for linearized track model
 174       AliTRDLeastSquare *fZfitter;        // Linear fitter in z-Direction
 175       AliTRDseedV1 *fTracklets[kNPlanes]; // Tracklet container
 176       TMatrixD *fCovarPolY;               // Polynomial Covariance Matrix Estimation (y-direction)
 177       TMatrixD *fCovarPolZ;               // Polynomial Covariance Matrix Estimation (z-direction)
 178       Double_t fXref;                     // Reference x position for fit in z-Direction
 179       Double_t fSysClusterError;          // Systematic cluster Error
 180       Double_t fParameters[5];            // Track Model Parameter
 181       Double_t fSumPolY[5];               // Sums for polynomial Covariance Matrix Estimation (y-direction)
 182       Double_t fSumPolZ[3];               // Sums for polynomial Covariance Matrix Estimation (z-direction)
 183   };
 184
 185 protected:
 186   static Bool_t  AdjustSector(AliTRDtrackV1 *const track);
 187   Double_t       BuildSeedingConfigs(AliTRDtrackingChamber **stack, Int_t *configs);
 188   Int_t          BuildTrackingContainers();
 189   static Float_t CalculateChi2Z(const AliTRDseedV1 *tracklets, Double_t offset, Double_t slope, Double_t xref);
 190   Int_t          Clusters2TracksSM(Int_t sector, AliESDEvent *esd);
 191   Int_t          Clusters2TracksStack(AliTRDtrackingChamber **stack, TClonesArray * const esdTrackList);
 192   AliTRDseedV1*  GetTracklet(const AliTRDtrackV1 *const trk, Int_t plane, Int_t &idx);
 193   Bool_t         GetTrackPoint(Int_t index, AliTrackPoint &p) const;
 194   Float_t        GetR4Layer(Int_t ly) const { return fR[ly];}
 195   Int_t          MakeSeeds(AliTRDtrackingChamber **stack, AliTRDseedV1 * const sseed, const Int_t * const ipar);
 196   AliTRDtrackV1* MakeTrack(AliTRDseedV1 * const tracklet);
 197   AliTRDtrackV1* SetTrack(const AliTRDtrackV1 * const track);
 198   AliTRDseedV1*  SetTracklet(const AliTRDseedV1 * const tracklet);
 199   void           UnsetTrackletsTrack(const AliTRDtrackV1 * const track);
 200
 201 private:
 202   AliTRDtrackerV1(const AliTRDtrackerV1 &tracker);
 203   AliTRDtrackerV1 &operator=(const AliTRDtrackerV1 &tracker);
 204   Double_t       CookLikelihood(AliTRDseedV1 *cseed, Int_t planes[4]);
 205   Double_t       CalculateTrackLikelihood(Double_t *chi2);
 206   Bool_t         ImproveSeedQuality(AliTRDtrackingChamber **stack, AliTRDseedV1 *tracklet, Double_t &chi2);
 207   static Float_t        CalculateReferenceX(const AliTRDseedV1 *const tracklets);
 208   void        ResetSeedTB();
 209   Float_t     GetChi2Y(const AliTRDseedV1 *const tracklets) const;
 210   Float_t     GetChi2Z(const AliTRDseedV1 *const tracklets) const;
 211   Float_t     GetChi2Phi(const AliTRDseedV1 *const tracklets) const;
 212
 213   const AliTRDReconstructor *fkReconstructor;           // reconstructor manager
 214   const AliTRDrecoParam     *fkRecoParam;               // reco param for the current event
 215   AliTRDgeometry      *fGeom;                           // Pointer to TRD geometry
 216   AliTRDtrackingSector fTrSec[kTrackingSectors];        // Array of tracking sectors;
 217   TClonesArray        *fClusters;                       // List of clusters
 218   TClonesArray        *fTracklets;                      // List of tracklets
 219   TClonesArray        *fTracks;                         // List of tracks
 220   TClonesArray        *fTracksESD;                      // List of ESD tracks in current SM
 221   Float_t              fR[kNPlanes];                    //! rough radial position of each TRD layer
 222
 223   // stand alone tracking
 224   static Double_t      fgTopologicQA[kNConfigs];        //  Topologic quality
 225   Double_t             fTrackQuality[kMaxTracksStack];  //  Track quality
 226   Int_t                fSeedLayer[kMaxTracksStack];     //  Seed layer
 227   AliTRDchamberTimeBin *fSeedTB[kNSeedPlanes]; // seeding time bin planes
 228   Int_t                fSieveSeeding;                   //! Seeding iterator
 229   Int_t                fEventInFile;                    //! event in file being tracked (debug purposes)
 230
 231   static ETRDtrackerV1BetheBloch fgBB;                  // Bethe Bloch method
 232   static const Double_t fgkX0[kNPlanes];                // default values for the position of anode wire
 233   static Int_t         fgNTimeBins;                     // Timebins per plane in track prolongation
 234   static TLinearFitter *fgTiltedRieman;                 //  Fitter for the tilted Rieman fit without vertex constriant
 235   static TLinearFitter *fgTiltedRiemanConstrained;      //  Fitter for the tilted Rieman fit with vertex constraint
 236   static AliRieman     *fgRieman;                       //  Fitter for the untilted Rieman fit
 237
 238   ClassDef(AliTRDtrackerV1, 7)                          //  TRD tracker - tracklet based tracking
 239
 240 };
 241 #endif