Possibility to calculate the DCA between two ESD track. The V0 and cascade vertexes...
[u/mrichter/AliRoot.git] / ITS / AliITStrackerMI.h
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e43c066c 1#ifndef ALIITSTRACKERMI_H
2#define ALIITSTRACKERMI_H
3/* Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
4 * See cxx source for full Copyright notice */
5
bf6adc12 6/* $Id$ */
7
e43c066c 8//-------------------------------------------------------------------------
9// ITS tracker
15dd636f 10// reads AliITSclusterMI clusters and creates AliITStrackMI tracks
11// Origin: Marian Ivanov, CERN, Marian.Ivanov@cern.ch
e43c066c 12//-------------------------------------------------------------------------
13
bf6adc12 14class TTree;
15class TTreeSRedirector;
e43c066c 16class AliESD;
e43c066c 17class AliHelix;
bf6adc12 18class AliITSgeom;
67c1e979 19
00a7cc50 20#include <TObjArray.h>
21#include "AliITSRecPoint.h"
bf6adc12 22#include "AliITStrackMI.h"
23#include "AliTracker.h"
e43c066c 24
25//-------------------------------------------------------------------------
26class AliITStrackerMI : public AliTracker {
27public:
28 AliITStrackerMI():AliTracker(){}
29 AliITStrackerMI(const AliITSgeom *geom);
628e7bb0 30 ~AliITStrackerMI();
e43c066c 31 AliCluster *GetCluster(Int_t index) const;
df29e9a4 32 virtual Bool_t GetTrackPoint(Int_t index, AliTrackPoint& p) const;
00a7cc50 33 AliITSRecPoint *GetClusterLayer(Int_t layn, Int_t ncl) const
e43c066c 34 {return fgLayers[layn].GetCluster(ncl);}
35 Int_t GetNumberOfClustersLayer(Int_t layn) const
36 {return fgLayers[layn].GetNumberOfClusters();}
37 Int_t LoadClusters(TTree *cf);
38 void UnloadClusters();
e43c066c 39 Int_t Clusters2Tracks(AliESD *event);
40 Int_t PropagateBack(AliESD *event);
41 Int_t RefitInward(AliESD *event);
15dd636f 42 Bool_t RefitAt(Double_t x, AliITStrackMI *seed, const AliITStrackMI *t);
67c1e979 43 Bool_t RefitAt(Double_t x, AliITStrackMI *seed, const Int_t *clindex);
e43c066c 44 void SetupFirstPass(Int_t *flags, Double_t *cuts=0);
45 void SetupSecondPass(Int_t *flags, Double_t *cuts=0);
46
47 void SetLastLayerToTrackTo(Int_t l=0) {fLastLayerToTrackTo=l;}
48 void SetLayersNotToSkip(Int_t *l);
49 void UseClusters(const AliKalmanTrack *t, Int_t from=0) const;
00a7cc50 50 void GetNTeor(Int_t layer, const AliITSRecPoint* cl, Float_t theta, Float_t phi, Float_t &ny, Float_t &nz);
51 Int_t GetError(Int_t layer, const AliITSRecPoint*cl, Float_t theta, Float_t phi, Float_t expQ, Float_t &erry, Float_t &errz);
628e7bb0 52
53 void GetDCASigma(AliITStrackMI* track, Float_t & sigmarfi, Float_t &sigmaz);
00a7cc50 54 Double_t GetPredictedChi2MI(AliITStrackMI* track, const AliITSRecPoint *cluster,Int_t layer);
55 Int_t UpdateMI(AliITStrackMI* track, const AliITSRecPoint* cl,Double_t chi2,Int_t layer) const;
e43c066c 56 class AliITSdetector {
57 public:
58 AliITSdetector(){}
59 AliITSdetector(Double_t r,Double_t phi) {fR=r; fPhi=phi; fSinPhi = TMath::Sin(phi); fCosPhi = TMath::Cos(phi);
60 fYmin=10000;fYmax=-1000; fZmin=10000;fZmax=-1000;}
00a7cc50 61 inline void GetGlobalXYZ( const AliITSRecPoint *cl, Double_t xyz[3]) const;
e43c066c 62 Double_t GetR() const {return fR;}
63 Double_t GetPhi() const {return fPhi;}
64 Double_t GetYmin() const {return fYmin;}
65 Double_t GetYmax() const {return fYmax;}
66 Double_t GetZmin() const {return fZmin;}
67 Double_t GetZmax() const {return fZmax;}
68 void SetYmin(Double_t min) {fYmin = min;}
69 void SetYmax(Double_t max) {fYmax = max;}
70 void SetZmin(Double_t min) {fZmin = min;}
71 void SetZmax(Double_t max) {fZmax = max;}
72 private:
73 Double_t fR; // polar coordinates
74 Double_t fPhi; // of this detector
75 Double_t fSinPhi; // sin of phi;
76 Double_t fCosPhi; // cos of phi
77 Double_t fYmin; // local y minimal
78 Double_t fYmax; // local max y
79 Double_t fZmin; // local z min
80 Double_t fZmax; // local z max
81 };
82
83 class AliITSlayer {
84 friend class AliITStrackerMI;
85 public:
86 AliITSlayer();
87 AliITSlayer(Double_t r, Double_t p, Double_t z, Int_t nl, Int_t nd);
88 ~AliITSlayer();
00a7cc50 89 Int_t InsertCluster(AliITSRecPoint *c);
e43c066c 90 void SortClusters();
91 void ResetClusters();
92 void ResetWeights();
93 void SelectClusters(Double_t zmi,Double_t zma,Double_t ymi,Double_t yma);
00a7cc50 94 const AliITSRecPoint *GetNextCluster(Int_t &ci);
e43c066c 95 void ResetRoad();
96 Double_t GetRoad() const {return fRoad;}
97 Double_t GetR() const {return fR;}
98 Int_t FindClusterIndex(Float_t z) const;
00a7cc50 99 AliITSRecPoint *GetCluster(Int_t i) const {return i<fN? fClusters[i]:0;}
bf6adc12 100 Float_t *GetWeight(Int_t i) {return i<fN ?&fClusterWeight[i]:0;}
e43c066c 101 AliITSdetector &GetDetector(Int_t n) const { return fDetectors[n]; }
102 Int_t FindDetectorIndex(Double_t phi, Double_t z) const;
103 Double_t GetThickness(Double_t y, Double_t z, Double_t &x0) const;
104 Int_t InRoad() const ;
105 Int_t GetNumberOfClusters() const {return fN;}
106 Int_t GetNladders() const {return fNladders;}
107 Int_t GetNdetectors() const {return fNdetectors;}
108 Int_t GetSkip() const {return fSkip;}
109 void SetSkip(Int_t skip){fSkip=skip;}
110 void IncAccepted(){fAccepted++;}
81e97e0d 111 Int_t GetAccepted() const {return fAccepted;}
e43c066c 112 protected:
bf6adc12 113 AliITSlayer(const AliITSlayer& /*layer*/);
114 AliITSlayer & operator=(const AliITSlayer& /*layer*/);
e43c066c 115 Double_t fR; // mean radius of this layer
116 Double_t fPhiOffset; // offset of the first detector in Phi
117 Int_t fNladders; // number of ladders
118 Double_t fZOffset; // offset of the first detector in Z
119 Int_t fNdetectors; // detectors/ladder
120 AliITSdetector *fDetectors; // array of detectors
121 Int_t fN; // number of clusters
00a7cc50 122 AliITSRecPoint *fClusters[kMaxClusterPerLayer]; // pointers to clusters
e43c066c 123 Int_t fClusterIndex[kMaxClusterPerLayer]; // pointers to clusters
124 Float_t fY[kMaxClusterPerLayer]; // y position of the clusters
125 Float_t fZ[kMaxClusterPerLayer]; // z position of the clusters
126 Float_t fYB[2]; // ymin and ymax
127 //
00a7cc50 128 AliITSRecPoint *fClusters5[6][kMaxClusterPerLayer5]; // pointers to clusters - slice in y
e43c066c 129 Int_t fClusterIndex5[6][kMaxClusterPerLayer5]; // pointers to clusters - slice in y
130 Float_t fY5[6][kMaxClusterPerLayer5]; // y position of the clusters slice in y
131 Float_t fZ5[6][kMaxClusterPerLayer5]; // z position of the clusters slice in y
132 Int_t fN5[6]; // number of cluster in slice
133 Float_t fDy5; //delta y
134 Float_t fBy5[6][2]; //slice borders
135 //
00a7cc50 136 AliITSRecPoint *fClusters10[11][kMaxClusterPerLayer10]; // pointers to clusters - slice in y
e43c066c 137 Int_t fClusterIndex10[11][kMaxClusterPerLayer10]; // pointers to clusters - slice in y
138 Float_t fY10[11][kMaxClusterPerLayer10]; // y position of the clusters slice in y
139 Float_t fZ10[11][kMaxClusterPerLayer10]; // z position of the clusters slice in y
140 Int_t fN10[11]; // number of cluster in slice
f43e383b 141 Float_t fDy10; // delta y
142 Float_t fBy10[11][2]; // slice borders
e43c066c 143 //
00a7cc50 144 AliITSRecPoint *fClusters20[21][kMaxClusterPerLayer20]; // pointers to clusters - slice in y
e43c066c 145 Int_t fClusterIndex20[21][kMaxClusterPerLayer20]; // pointers to clusters - slice in y
146 Float_t fY20[21][kMaxClusterPerLayer20]; // y position of the clusters slice in y
147 Float_t fZ20[21][kMaxClusterPerLayer20]; // z position of the clusters slice in y
148 Int_t fN20[21]; // number of cluster in slice
f43e383b 149 Float_t fDy20; //delta y
150 Float_t fBy20[21][2]; //slice borders
e43c066c 151 //
00a7cc50 152 AliITSRecPoint** fClustersCs; //clusters table in current slice
e43c066c 153 Int_t *fClusterIndexCs; //cluster index in current slice
154 Float_t *fYcs; //y position in current slice
155 Float_t *fZcs; //z position in current slice
156 Int_t fNcs; //number of clusters in current slice
157 Int_t fCurrentSlice; //current slice
158 //
159 Float_t fClusterWeight[kMaxClusterPerLayer]; // probabilistic weight of the cluster
160 Int_t fClusterTracks[4][kMaxClusterPerLayer]; //tracks registered to given cluster
161 Float_t fZmax; // edges
162 Float_t fYmin; // of the
163 Float_t fYmax; // "window"
164 Int_t fI; // index of the current cluster within the "window"
165 Int_t fImax; // index of the last cluster within the "window"
166 Int_t fSkip; // indicates possibility to skip cluster
f43e383b 167 Int_t fAccepted; // accept indicator
e43c066c 168 Double_t fRoad; // road defined by the cluster density
169 };
170 AliITStrackerMI::AliITSlayer & GetLayer(Int_t layer) const;
171 AliITStrackerMI::AliITSdetector & GetDetector(Int_t layer, Int_t n) const {return GetLayer(layer).GetDetector(n); }
172
173protected:
81e97e0d 174 Int_t GetNearestLayer(const Double_t *xr) const; //get nearest upper layer close to the point xr
175 void FindV02(AliESD *event); //try to find V0
67c1e979 176 void RefitV02(AliESD *event); //try to refit V0's
81e97e0d 177 void UpdateTPCV0(AliESD *event); //try to update, or reject TPC V0s
e43c066c 178 void CookLabel(AliKalmanTrack *t,Float_t wrong) const;
15dd636f 179 void CookLabel(AliITStrackMI *t,Float_t wrong) const;
e43c066c 180 Double_t GetEffectiveThickness(Double_t y, Double_t z) const;
81e97e0d 181 void FollowProlongationTree(AliITStrackMI * otrack, Int_t esdindex, Bool_t constrain);
e43c066c 182 void ResetBestTrack() {
15dd636f 183 fBestTrack.~AliITStrackMI();
184 new(&fBestTrack) AliITStrackMI(fTrackToFollow);
e43c066c 185 }
15dd636f 186 void ResetTrackToFollow(const AliITStrackMI &t) {
187 fTrackToFollow.~AliITStrackMI();
188 new(&fTrackToFollow) AliITStrackMI(t);
e43c066c 189 }
15dd636f 190 void CookdEdx(AliITStrackMI* track);
191 Double_t GetNormalizedChi2(AliITStrackMI * track, Int_t mode);
192 Double_t GetTruncatedChi2(AliITStrackMI * track, Float_t fac);
193 Double_t NormalizedChi2(AliITStrackMI * track, Int_t layer);
194 Double_t GetInterpolatedChi2(AliITStrackMI * forwardtrack, AliITStrackMI * backtrack);
195 Double_t GetMatchingChi2(AliITStrackMI * track1, AliITStrackMI * track2);
e43c066c 196 Double_t GetDeadZoneProbability(Double_t zpos, Double_t zerr);
197
198 Float_t *GetWeight(Int_t index);
15dd636f 199 void AddTrackHypothesys(AliITStrackMI * track, Int_t esdindex);
e43c066c 200 void SortTrackHypothesys(Int_t esdindex, Int_t maxcut, Int_t mode);
15dd636f 201 AliITStrackMI * GetBestHypothesys(Int_t esdindex, AliITStrackMI * original, Int_t checkmax);
e43c066c 202 void GetBestHypothesysMIP(TObjArray &itsTracks);
15dd636f 203 void RegisterClusterTracks(AliITStrackMI* track, Int_t id);
204 void UnRegisterClusterTracks(AliITStrackMI* track, Int_t id);
00a7cc50 205 Float_t GetNumberOfSharedClusters(AliITStrackMI* track,Int_t id, Int_t list[6], AliITSRecPoint *clist[6]);
15dd636f 206 Int_t GetOverlapTrack(AliITStrackMI *track, Int_t trackID, Int_t &shared, Int_t clusterlist[6], Int_t overlist[6]);
207 AliITStrackMI * GetBest2Tracks(Int_t trackID1, Int_t treackID2, Float_t th0, Float_t th1);
e43c066c 208 Float_t * GetErrY(Int_t trackindex) const {return &fCoeficients[trackindex*48];}
209 Float_t * GetErrZ(Int_t trackindex) const {return &fCoeficients[trackindex*48+12];}
210 Float_t * GetNy(Int_t trackindex) const {return &fCoeficients[trackindex*48+24];}
211 Float_t * GetNz(Int_t trackindex) const {return &fCoeficients[trackindex*48+36];}
212 void SignDeltas( TObjArray *ClusterArray, Float_t zv);
213 void MakeCoeficients(Int_t ntracks);
15dd636f 214 void UpdateESDtrack(AliITStrackMI* track, ULong_t flags) const;
e43c066c 215 Int_t fI; // index of the current layer
216 static AliITSlayer fgLayers[kMaxLayer];// ITS layers
15dd636f 217 AliITStrackMI fTracks[kMaxLayer]; // track estimations at the ITS layers
218 AliITStrackMI fBestTrack; // "best" track
219 AliITStrackMI fTrackToFollow; // followed track
e43c066c 220 TObjArray fTrackHypothesys; // ! array with track hypothesys- ARRAY is the owner of tracks- MI
81e97e0d 221 TObjArray fBestHypothesys; // ! array with track hypothesys- ARRAY is the owner of tracks- MI
628e7bb0 222 TObjArray fOriginal; // ! array with seeds from the TPC
e43c066c 223 Int_t fBestTrackIndex[100000]; // ! index of the best track
224 Int_t fCurrentEsdTrack; // ! current esd track - MI
225 Int_t fPass; // current pass through the data
226 Int_t fConstraint[2]; // constraint flags
628e7bb0 227 Bool_t fAfterV0; //indicates V0 founded
e43c066c 228 Int_t fLayersNotToSkip[kMaxLayer]; // layer masks
229 Int_t fLastLayerToTrackTo; // the innermost layer to track to
230 Float_t * fCoeficients; //! working array with errors and mean cluser shape
81e97e0d 231 AliESD * fEsd; //! pointer to the ESD event
232 TTreeSRedirector *fDebugStreamer; //!debug streamer
bf6adc12 233private:
234 AliITStrackerMI(const AliITStrackerMI &);
235 AliITStrackerMI & operator=(const AliITStrackerMI &);
15dd636f 236 ClassDef(AliITStrackerMI,2) //ITS tracker MI
e43c066c 237};
238
239
240
241
242/////////////////////////////////////////////////////////
243/////////////////////////////////////////////////////////
244/////////////////////////////////////////////////////////
245
246
247
248
249
250inline void AliITStrackerMI::SetupFirstPass(Int_t *flags, Double_t *cuts) {
251 // This function sets up flags and cuts for the first tracking pass
252 //
253 // flags[0] - vertex constaint flag
254 // negative means "skip the pass"
255 // 0 means "no constraint"
256 // positive means "normal constraint"
257
258 fConstraint[0]=flags[0];
259 if (cuts==0) return;
260}
261
262inline void AliITStrackerMI::SetupSecondPass(Int_t *flags, Double_t *cuts) {
263 // This function sets up flags and cuts for the second tracking pass
264 //
265 // flags[0] - vertex constaint flag
266 // negative means "skip the pass"
267 // 0 means "no constraint"
268 // positive means "normal constraint"
269
270 fConstraint[1]=flags[0];
271 if (cuts==0) return;
272}
273
274inline void AliITStrackerMI::CookLabel(AliKalmanTrack *t,Float_t wrong) const {
275 //--------------------------------------------------------------------
276 //This function "cooks" a track label. If label<0, this track is fake.
277 //--------------------------------------------------------------------
278 Int_t tpcLabel=t->GetLabel();
279 if (tpcLabel<0) return;
280 AliTracker::CookLabel(t,wrong);
281 if (tpcLabel!=TMath::Abs(t->GetLabel())){
282 t->SetFakeRatio(1.);
283 }
284 if (tpcLabel !=t->GetLabel()) {
285 t->SetLabel(-tpcLabel);
286 }
287}
288
15dd636f 289inline Double_t AliITStrackerMI::NormalizedChi2(AliITStrackMI * track, Int_t layer)
e43c066c 290{
291 //--------------------------------------------------------------------
292 //get normalize chi2
293 //--------------------------------------------------------------------
294 track->fNormChi2[layer] = 2.*track->fNSkipped+0.25*track->fNDeadZone+track->fdEdxMismatch+track->GetChi2()/
295 //track->fNormChi2[layer] = 2.*track->fNSkipped+0.25*track->fNDeadZone+track->fdEdxMismatch+track->fChi22/
296 TMath::Max(double(track->GetNumberOfClusters()-track->fNSkipped),
297 1./(1.+track->fNSkipped));
298 return track->fNormChi2[layer];
299}
00a7cc50 300inline void AliITStrackerMI::AliITSdetector::GetGlobalXYZ(const AliITSRecPoint *cl, Double_t xyz[3]) const
e43c066c 301{
302 //
303 // get cluster coordinates in global cooordinate
304 //
305 xyz[2] = cl->GetZ();
306 xyz[0] = fR*fCosPhi - cl->GetY()*fSinPhi;
307 xyz[1] = fR*fSinPhi + cl->GetY()*fCosPhi;
308}
309#endif