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   static void SetNTimeBins(Int_t nTimeBins){fgNTimeBins = nTimeBins; }
  71   AliCluster*    GetCluster(Int_t index) const;
  72         static void    GetExtrapolationConfig(Int_t iconfig, Int_t planes[2]);
  73         static const Int_t   GetNTimeBins() {return fgNTimeBins;}
  74         static void    GetSeedingConfig(Int_t iconfig, Int_t planes[4]);
  75         static TLinearFitter *GetTiltedRiemanFitter();
  76         static TLinearFitter *GetTiltedRiemanFitterConstraint();
  77         static AliRieman *GetRiemanFitter();
  78         static void    FitRieman(AliTRDcluster **clusters, Double_t chi2[2]);
  79         static Float_t FitRieman(AliTRDseedV1 *tracklets, Double_t *chi2, Int_t *planes = 0x0);
  80         static Float_t FitTiltedRiemanConstraint(AliTRDseedV1 *tracklets, Double_t zVertex);
  81         static Float_t FitTiltedRieman(AliTRDseedV1 *tracklets, Bool_t sigError);
  82
  83         Int_t          FollowBackProlongation(AliTRDtrackV1 &t);
  84         Int_t          FollowProlongation(AliTRDtrackV1 &t);
  85   Int_t          LoadClusters(TTree *cTree);
  86         Int_t          PropagateBack(AliESDEvent *event);
  87   Int_t          ReadClusters(TClonesArray* &array, TTree *in) const;
  88         Int_t          RefitInward(AliESDEvent *event);
  89         void           UnloadClusters();
  90
  91   static Int_t   Freq(Int_t n, const Int_t *inlist, Int_t *outlist, Bool_t down); // to be removed
  92
  93         class AliTRDLeastSquare{
  94         public:
  95                                         AliTRDLeastSquare();
  96                                         ~AliTRDLeastSquare(){};
  97
  98                 void            AddPoint(Double_t *x, Double_t y, Double_t sigmaY);
  99                 void            RemovePoint(Double_t *x, Double_t y, Double_t sigmaY);
 100                 void            Eval();
 101
 102                 Double_t        GetFunctionParameter(Int_t ParNumber) const {return fParams[ParNumber];}
 103                 Double_t        GetFunctionValue(Double_t *xpos) const;
 104                 void            GetCovarianceMatrix(Double_t *storage) const;
 105         private:
 106                                         AliTRDLeastSquare(const AliTRDLeastSquare &);
 107                 AliTRDLeastSquare& operator=(const AliTRDLeastSquare &);
 108                 Double_t        fParams[2];                                             // Fitparameter
 109                 Double_t        fCovarianceMatrix[3];                   // Covariance Matrix
 110                 Double_t        fSums[6];                                               // Sums
 111         };
 112
 113 protected:
 114   Bool_t         AdjustSector(AliTRDtrackV1 *track);
 115         Double_t       BuildSeedingConfigs(AliTRDtrackingChamber **stack, Int_t *configs);
 116         static Float_t CalculateChi2Z(AliTRDseedV1 *tracklets, Double_t offset, Double_t slope, Double_t xref);
 117         Int_t          Clusters2TracksSM(Int_t sector, AliESDEvent *esd);
 118         Int_t          Clusters2TracksStack(AliTRDtrackingChamber **stack, TClonesArray *esdTrackList);
 119         AliTRDseedV1*  GetTracklet(AliTRDtrackV1 *trk, Int_t plane, Int_t &idx);
 120         Bool_t         GetTrackPoint(Int_t index, AliTrackPoint &p) const;
 121         Int_t          MakeSeeds(AliTRDtrackingChamber **stack, AliTRDseedV1 *sseed, Int_t *ipar);
 122         AliTRDtrackV1* MakeTrack(AliTRDseedV1 *seeds, Double_t *params);
 123   Int_t          PropagateToX(AliTRDtrackV1 &t, Double_t xToGo, Double_t maxStep);
 124         Int_t          SetTracklet(AliTRDseedV1 *tracklet);
 125         Bool_t         UpdateTracklet(AliTRDseedV1 *tracklet, Int_t index);
 126
 127 private:
 128         AliTRDtrackerV1(const AliTRDtrackerV1 &tracker);
 129         AliTRDtrackerV1 &operator=(const AliTRDtrackerV1 &tracker);
 130         Double_t        CookLikelihood(AliTRDseedV1 *cseed, Int_t planes[4], Double_t *chi2);
 131         Double_t        CalculateTrackLikelihood(AliTRDseedV1 *tracklets, Double_t *chi2);
 132         Int_t           ImproveSeedQuality(AliTRDtrackingChamber **stack, AliTRDseedV1 *tracklet);
 133         static Float_t  CalculateReferenceX(AliTRDseedV1 *tracklets);
 134
 135         Float_t     GetChi2Y(AliTRDseedV1 *tracklets) const;
 136         Float_t     GetChi2Z(AliTRDseedV1 *tracklets) const;
 137
 138 private:
 139   AliTRDgeometry          *fGeom;                          // Pointer to TRD geometry
 140   AliTRDtrackingSector    fTrSec[kTrackingSectors];       // Array of tracking sectors;
 141
 142   TClonesArray        *fClusters;                       // List of clusters
 143   TClonesArray        *fTracklets;                      // List of tracklets
 144   TClonesArray        *fTracks;                         // List of tracks
 145
 146   // should go to the recoParam
 147   static const Double_t    fgkMaxChi2;                     // Max increment in track chi2
 148   static const Float_t     fgkMinClustersInTrack;          // Min number of clusters in track
 149   static const Float_t     fgkLabelFraction;               // Min fraction of same label
 150   static const Double_t    fgkMaxSnp;                      // Maximal snp for tracking
 151   static const Double_t    fgkMaxStep;                     // Maximal step for tracking
 152
 153         // stand alone tracking
 154         static Double_t      fgTopologicQA[kNConfigs];        //  Topologic quality
 155         Double_t             fTrackQuality[kMaxTracksStack];  //  Track quality
 156         Int_t                fSeedLayer[kMaxTracksStack];     //  Seed layer
 157         Int_t                fSieveSeeding;                   //! Seeding iterator
 158
 159   static Int_t         fgNTimeBins;                     // Timebins per plane in track prolongation
 160         static TLinearFitter *fgTiltedRieman;                 //  Fitter for the tilted Rieman fit without vertex constriant
 161         static TLinearFitter *fgTiltedRiemanConstrained;      //  Fitter for the tilted Rieman fit with vertex constraint
 162         static AliRieman     *fgRieman;                       //  Fitter for the untilted Rieman fit
 163
 164         static TTreeSRedirector *fgDebugStreamer;             //!Debug streamer
 165
 166         ClassDef(AliTRDtrackerV1, 2)                          //  TRD tracker development class
 167
 168 };
 169 #endif