New fitting function for straight line tracks (no magnetic field)
[u/mrichter/AliRoot.git] / 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   AliTRDseedV1*  SetTracklet(AliTRDseedV1 *tracklet);
134
135 private:
136         AliTRDtrackerV1(const AliTRDtrackerV1 &tracker);
137         AliTRDtrackerV1 &operator=(const AliTRDtrackerV1 &tracker);
138         Double_t        CookLikelihood(AliTRDseedV1 *cseed, Int_t planes[4], Double_t *chi2);
139         Double_t        CalculateTrackLikelihood(AliTRDseedV1 *tracklets, Double_t *chi2);
140         Int_t           ImproveSeedQuality(AliTRDtrackingChamber **stack, AliTRDseedV1 *tracklet);
141         static Float_t  CalculateReferenceX(AliTRDseedV1 *tracklets);
142         
143         Float_t     GetChi2Y(AliTRDseedV1 *tracklets) const;
144         Float_t     GetChi2Z(AliTRDseedV1 *tracklets) const;
145
146 private:
147   AliTRDgeometry          *fGeom;                          // Pointer to TRD geometry
148   AliTRDtrackingSector    fTrSec[kTrackingSectors];       // Array of tracking sectors;    
149
150   TClonesArray        *fClusters;                       // List of clusters
151   TClonesArray        *fTracklets;                      // List of tracklets
152   TClonesArray        *fTracks;                         // List of tracks
153   
154   // should go to the recoParam
155   static const Double_t    fgkMaxChi2;                     // Max increment in track chi2 
156   static const Float_t     fgkMinClustersInTrack;          // Min number of clusters in track
157   static const Float_t     fgkLabelFraction;               // Min fraction of same label
158   static const Double_t    fgkMaxSnp;                      // Maximal snp for tracking
159   static const Double_t    fgkMaxStep;                     // Maximal step for tracking  
160         
161         // stand alone tracking
162         static Double_t      fgTopologicQA[kNConfigs];        //  Topologic quality
163         Double_t             fTrackQuality[kMaxTracksStack];  //  Track quality 
164         Int_t                fSeedLayer[kMaxTracksStack];     //  Seed layer
165         Int_t                fSieveSeeding;                   //! Seeding iterator
166         
167   static Int_t         fgNTimeBins;                     // Timebins per plane in track prolongation 
168         static TLinearFitter *fgTiltedRieman;                 //  Fitter for the tilted Rieman fit without vertex constriant
169         static TLinearFitter *fgTiltedRiemanConstrained;      //  Fitter for the tilted Rieman fit with vertex constraint       
170         static AliRieman     *fgRieman;                       //  Fitter for the untilted Rieman fit
171   
172         static TTreeSRedirector *fgDebugStreamer;             //!Debug streamer
173         
174         ClassDef(AliTRDtrackerV1, 2)                          //  TRD tracker development class
175
176 };
177 #endif