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Adding DCA information (B.Hippolyte)
[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
6//-------------------------------------------------------------------------
7// ITS tracker
15dd636f 8// reads AliITSclusterMI clusters and creates AliITStrackMI tracks
9// Origin: Marian Ivanov, CERN, Marian.Ivanov@cern.ch
e43c066c 10//-------------------------------------------------------------------------
11
12#include <TObjArray.h>
13
14#include "AliTracker.h"
15dd636f 15#include "AliITStrackMI.h"
e43c066c 16#include "AliITSclusterV2.h"
51ad6848 17#include "AliV0vertex.h"
e43c066c 18
e43c066c 19class AliESD;
20class AliITSgeom;
21class TTree;
22class AliHelix;
23class AliV0vertex;
51ad6848 24class AliESDV0MI;
e43c066c 25
26
27
28
29//-------------------------------------------------------------------------
30class AliITStrackerMI : public AliTracker {
31public:
32 AliITStrackerMI():AliTracker(){}
33 AliITStrackerMI(const AliITSgeom *geom);
628e7bb0 34 ~AliITStrackerMI();
e43c066c 35 AliCluster *GetCluster(Int_t index) const;
36 AliITSclusterV2 *GetClusterLayer(Int_t layn, Int_t ncl) const
37 {return fgLayers[layn].GetCluster(ncl);}
38 Int_t GetNumberOfClustersLayer(Int_t layn) const
39 {return fgLayers[layn].GetNumberOfClusters();}
40 Int_t LoadClusters(TTree *cf);
41 void UnloadClusters();
e43c066c 42 Int_t Clusters2Tracks(AliESD *event);
43 Int_t PropagateBack(AliESD *event);
44 Int_t RefitInward(AliESD *event);
15dd636f 45 Bool_t RefitAt(Double_t x, AliITStrackMI *seed, const AliITStrackMI *t);
e43c066c 46 void SetupFirstPass(Int_t *flags, Double_t *cuts=0);
47 void SetupSecondPass(Int_t *flags, Double_t *cuts=0);
48
49 void SetLastLayerToTrackTo(Int_t l=0) {fLastLayerToTrackTo=l;}
50 void SetLayersNotToSkip(Int_t *l);
51 void UseClusters(const AliKalmanTrack *t, Int_t from=0) const;
52 void GetNTeor(Int_t layer, const AliITSclusterV2* cl, Float_t theta, Float_t phi, Float_t &ny, Float_t &nz);
53 Int_t GetError(Int_t layer, const AliITSclusterV2*cl, Float_t theta, Float_t phi, Float_t expQ, Float_t &erry, Float_t &errz);
628e7bb0 54
55 void GetDCASigma(AliITStrackMI* track, Float_t & sigmarfi, Float_t &sigmaz);
15dd636f 56 Double_t GetPredictedChi2MI(AliITStrackMI* track, const AliITSclusterV2 *cluster,Int_t layer);
57 Int_t UpdateMI(AliITStrackMI* track, const AliITSclusterV2* cl,Double_t chi2,Int_t layer) const;
e43c066c 58 class AliITSdetector {
59 public:
60 AliITSdetector(){}
61 AliITSdetector(Double_t r,Double_t phi) {fR=r; fPhi=phi; fSinPhi = TMath::Sin(phi); fCosPhi = TMath::Cos(phi);
62 fYmin=10000;fYmax=-1000; fZmin=10000;fZmax=-1000;}
63 inline void GetGlobalXYZ( const AliITSclusterV2 *cl, Double_t xyz[3]) const;
64 Double_t GetR() const {return fR;}
65 Double_t GetPhi() const {return fPhi;}
66 Double_t GetYmin() const {return fYmin;}
67 Double_t GetYmax() const {return fYmax;}
68 Double_t GetZmin() const {return fZmin;}
69 Double_t GetZmax() const {return fZmax;}
70 void SetYmin(Double_t min) {fYmin = min;}
71 void SetYmax(Double_t max) {fYmax = max;}
72 void SetZmin(Double_t min) {fZmin = min;}
73 void SetZmax(Double_t max) {fZmax = max;}
74 private:
75 Double_t fR; // polar coordinates
76 Double_t fPhi; // of this detector
77 Double_t fSinPhi; // sin of phi;
78 Double_t fCosPhi; // cos of phi
79 Double_t fYmin; // local y minimal
80 Double_t fYmax; // local max y
81 Double_t fZmin; // local z min
82 Double_t fZmax; // local z max
83 };
84
85 class AliITSlayer {
86 friend class AliITStrackerMI;
87 public:
88 AliITSlayer();
89 AliITSlayer(Double_t r, Double_t p, Double_t z, Int_t nl, Int_t nd);
90 ~AliITSlayer();
91 Int_t InsertCluster(AliITSclusterV2 *c);
92 void SortClusters();
93 void ResetClusters();
94 void ResetWeights();
95 void SelectClusters(Double_t zmi,Double_t zma,Double_t ymi,Double_t yma);
96 const AliITSclusterV2 *GetNextCluster(Int_t &ci);
97 void ResetRoad();
98 Double_t GetRoad() const {return fRoad;}
99 Double_t GetR() const {return fR;}
100 Int_t FindClusterIndex(Float_t z) const;
101 AliITSclusterV2 *GetCluster(Int_t i) const {return i<fN? fClusters[i]:0;}
f43e383b 102 Float_t *GetWeight(Int_t i) {return i<fN ?&fClusterWeight[i]:0;}
e43c066c 103 AliITSdetector &GetDetector(Int_t n) const { return fDetectors[n]; }
104 Int_t FindDetectorIndex(Double_t phi, Double_t z) const;
105 Double_t GetThickness(Double_t y, Double_t z, Double_t &x0) const;
106 Int_t InRoad() const ;
107 Int_t GetNumberOfClusters() const {return fN;}
108 Int_t GetNladders() const {return fNladders;}
109 Int_t GetNdetectors() const {return fNdetectors;}
110 Int_t GetSkip() const {return fSkip;}
111 void SetSkip(Int_t skip){fSkip=skip;}
112 void IncAccepted(){fAccepted++;}
113 Int_t GetAccepted() const {return fAccepted;}
114 protected:
65780d25 115 AliITSlayer(const AliITSlayer& /*layer*/){;}
e43c066c 116 Double_t fR; // mean radius of this layer
117 Double_t fPhiOffset; // offset of the first detector in Phi
118 Int_t fNladders; // number of ladders
119 Double_t fZOffset; // offset of the first detector in Z
120 Int_t fNdetectors; // detectors/ladder
121 AliITSdetector *fDetectors; // array of detectors
122 Int_t fN; // number of clusters
123 AliITSclusterV2 *fClusters[kMaxClusterPerLayer]; // pointers to clusters
124 Int_t fClusterIndex[kMaxClusterPerLayer]; // pointers to clusters
125 Float_t fY[kMaxClusterPerLayer]; // y position of the clusters
126 Float_t fZ[kMaxClusterPerLayer]; // z position of the clusters
127 Float_t fYB[2]; // ymin and ymax
128 //
129 AliITSclusterV2 *fClusters5[6][kMaxClusterPerLayer5]; // pointers to clusters - slice in y
130 Int_t fClusterIndex5[6][kMaxClusterPerLayer5]; // pointers to clusters - slice in y
131 Float_t fY5[6][kMaxClusterPerLayer5]; // y position of the clusters slice in y
132 Float_t fZ5[6][kMaxClusterPerLayer5]; // z position of the clusters slice in y
133 Int_t fN5[6]; // number of cluster in slice
134 Float_t fDy5; //delta y
135 Float_t fBy5[6][2]; //slice borders
136 //
137 AliITSclusterV2 *fClusters10[11][kMaxClusterPerLayer10]; // pointers to clusters - slice in y
138 Int_t fClusterIndex10[11][kMaxClusterPerLayer10]; // pointers to clusters - slice in y
139 Float_t fY10[11][kMaxClusterPerLayer10]; // y position of the clusters slice in y
140 Float_t fZ10[11][kMaxClusterPerLayer10]; // z position of the clusters slice in y
141 Int_t fN10[11]; // number of cluster in slice
f43e383b 142 Float_t fDy10; // delta y
143 Float_t fBy10[11][2]; // slice borders
e43c066c 144 //
145 AliITSclusterV2 *fClusters20[21][kMaxClusterPerLayer20]; // pointers to clusters - slice in y
146 Int_t fClusterIndex20[21][kMaxClusterPerLayer20]; // pointers to clusters - slice in y
147 Float_t fY20[21][kMaxClusterPerLayer20]; // y position of the clusters slice in y
148 Float_t fZ20[21][kMaxClusterPerLayer20]; // z position of the clusters slice in y
149 Int_t fN20[21]; // number of cluster in slice
f43e383b 150 Float_t fDy20; //delta y
151 Float_t fBy20[21][2]; //slice borders
e43c066c 152 //
153 AliITSclusterV2** fClustersCs; //clusters table in current slice
154 Int_t *fClusterIndexCs; //cluster index in current slice
155 Float_t *fYcs; //y position in current slice
156 Float_t *fZcs; //z position in current slice
157 Int_t fNcs; //number of clusters in current slice
158 Int_t fCurrentSlice; //current slice
159 //
160 Float_t fClusterWeight[kMaxClusterPerLayer]; // probabilistic weight of the cluster
161 Int_t fClusterTracks[4][kMaxClusterPerLayer]; //tracks registered to given cluster
162 Float_t fZmax; // edges
163 Float_t fYmin; // of the
164 Float_t fYmax; // "window"
165 Int_t fI; // index of the current cluster within the "window"
166 Int_t fImax; // index of the last cluster within the "window"
167 Int_t fSkip; // indicates possibility to skip cluster
f43e383b 168 Int_t fAccepted; // accept indicator
e43c066c 169 Double_t fRoad; // road defined by the cluster density
170 };
171 AliITStrackerMI::AliITSlayer & GetLayer(Int_t layer) const;
172 AliITStrackerMI::AliITSdetector & GetDetector(Int_t layer, Int_t n) const {return GetLayer(layer).GetDetector(n); }
173
174protected:
175 void FindV0(AliESD *event); //try to find V0
628e7bb0 176 Double_t TestV0(AliHelix *h1, AliHelix *h2, AliESDV0MI *vertex, Double_t &rmin); //try to find V0 - return DCA
177 Bool_t FindBestPair(Int_t esdtrack0, Int_t esdtrack1,AliESDV0MI *vertex, Int_t &ibest0, Int_t &ibest1); // try to find best pair from the tree of track hyp.
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;
15dd636f 181 void FollowProlongationTree(AliITStrackMI * otrack, Int_t esdindex);
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);
205 Float_t GetNumberOfSharedClusters(AliITStrackMI* track,Int_t id, Int_t list[6], AliITSclusterV2 *clist[6]);
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
628e7bb0 221 TObjArray fOriginal; // ! array with seeds from the TPC
e43c066c 222 Int_t fBestTrackIndex[100000]; // ! index of the best track
223 Int_t fCurrentEsdTrack; // ! current esd track - MI
224 Int_t fPass; // current pass through the data
225 Int_t fConstraint[2]; // constraint flags
628e7bb0 226 Bool_t fAfterV0; //indicates V0 founded
e43c066c 227 Int_t fLayersNotToSkip[kMaxLayer]; // layer masks
228 Int_t fLastLayerToTrackTo; // the innermost layer to track to
229 Float_t * fCoeficients; //! working array with errors and mean cluser shape
f43e383b 230 private:
65780d25 231 AliITStrackerMI(const AliITStrackerMI * /*tracker*/){;}
15dd636f 232 ClassDef(AliITStrackerMI,2) //ITS tracker MI
e43c066c 233};
234
235
236
237
238/////////////////////////////////////////////////////////
239/////////////////////////////////////////////////////////
240/////////////////////////////////////////////////////////
241
242
243
244
245
246inline void AliITStrackerMI::SetupFirstPass(Int_t *flags, Double_t *cuts) {
247 // This function sets up flags and cuts for the first tracking pass
248 //
249 // flags[0] - vertex constaint flag
250 // negative means "skip the pass"
251 // 0 means "no constraint"
252 // positive means "normal constraint"
253
254 fConstraint[0]=flags[0];
255 if (cuts==0) return;
256}
257
258inline void AliITStrackerMI::SetupSecondPass(Int_t *flags, Double_t *cuts) {
259 // This function sets up flags and cuts for the second tracking pass
260 //
261 // flags[0] - vertex constaint flag
262 // negative means "skip the pass"
263 // 0 means "no constraint"
264 // positive means "normal constraint"
265
266 fConstraint[1]=flags[0];
267 if (cuts==0) return;
268}
269
270inline void AliITStrackerMI::CookLabel(AliKalmanTrack *t,Float_t wrong) const {
271 //--------------------------------------------------------------------
272 //This function "cooks" a track label. If label<0, this track is fake.
273 //--------------------------------------------------------------------
274 Int_t tpcLabel=t->GetLabel();
275 if (tpcLabel<0) return;
276 AliTracker::CookLabel(t,wrong);
277 if (tpcLabel!=TMath::Abs(t->GetLabel())){
278 t->SetFakeRatio(1.);
279 }
280 if (tpcLabel !=t->GetLabel()) {
281 t->SetLabel(-tpcLabel);
282 }
283}
284
15dd636f 285inline Double_t AliITStrackerMI::NormalizedChi2(AliITStrackMI * track, Int_t layer)
e43c066c 286{
287 //--------------------------------------------------------------------
288 //get normalize chi2
289 //--------------------------------------------------------------------
290 track->fNormChi2[layer] = 2.*track->fNSkipped+0.25*track->fNDeadZone+track->fdEdxMismatch+track->GetChi2()/
291 //track->fNormChi2[layer] = 2.*track->fNSkipped+0.25*track->fNDeadZone+track->fdEdxMismatch+track->fChi22/
292 TMath::Max(double(track->GetNumberOfClusters()-track->fNSkipped),
293 1./(1.+track->fNSkipped));
294 return track->fNormChi2[layer];
295}
296inline void AliITStrackerMI::AliITSdetector::GetGlobalXYZ(const AliITSclusterV2 *cl, Double_t xyz[3]) const
297{
298 //
299 // get cluster coordinates in global cooordinate
300 //
301 xyz[2] = cl->GetZ();
302 xyz[0] = fR*fCosPhi - cl->GetY()*fSinPhi;
303 xyz[1] = fR*fSinPhi + cl->GetY()*fCosPhi;
304}
305#endif