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