3 /* Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
4 * See cxx source for full Copyright notice */
8 ////////////////////////////////////////////////////////////////////////////
10 // The TRD offline tracklet //
12 ////////////////////////////////////////////////////////////////////////////
14 #ifndef ALITRDTRACKLETBASE_H
15 #include "AliTRDtrackletBase.h"
22 #ifndef ALITRDGEOMETRY_H
23 #include "AliTRDgeometry.h"
31 #include "AliRieman.h"
34 #ifndef ALITRDCLUSTER_H
35 #include "AliTRDcluster.h"
38 class TTreeSRedirector;
42 class AliTRDtrackingChamber;
44 class AliTRDReconstructor;
46 class AliTRDseedV1 : public AliTRDtrackletBase
49 enum ETRDtrackletBuffers {
50 kNtb = 31 // max clusters/pad row
51 ,kNclusters = 2*kNtb // max number of clusters/tracklet
52 ,kNslices = 10 // max dEdx slices
55 // bits from 0-13 are reserved by ROOT (see TObject.h)
56 enum ETRDtrackletStatus {
57 kOwner = BIT(14) // owner of its clusters
58 ,kRowCross = BIT(15) // pad row cross tracklet
59 ,kCalib = BIT(16) // calibrated tracklet
60 ,kKink = BIT(17) // kink prolongation tracklet
61 ,kStandAlone = BIT(18)
64 AliTRDseedV1(Int_t det = -1);
66 AliTRDseedV1(const AliTRDseedV1 &ref);
67 AliTRDseedV1& operator=(const AliTRDseedV1 &ref);
69 /* Bool_t AttachClustersIter(
70 AliTRDtrackingChamber *chamber, Float_t quality,
71 Bool_t kZcorr = kFALSE, AliTRDcluster *c=0x0);*/
72 Bool_t AttachClusters(
73 AliTRDtrackingChamber *chamber, Bool_t tilt = kFALSE);
74 void Bootstrap(const AliTRDReconstructor *rec);
76 void CookdEdx(Int_t nslices);
79 Bool_t Fit(Bool_t tilt=kTRUE, Int_t errors = 2);
81 Bool_t Init(AliTRDtrackV1 *track);
82 inline void Init(const AliRieman *fit);
83 Bool_t IsEqual(const TObject *inTracklet) const;
84 Bool_t IsCalibrated() const { return TestBit(kCalib);}
85 Bool_t IsOwner() const { return TestBit(kOwner);}
86 Bool_t IsKink() const { return TestBit(kKink);}
87 Bool_t IsOK() const { return GetN() > 4 && GetNUsed() < 4;}
88 Bool_t IsRowCross() const { return TestBit(kRowCross);}
89 Bool_t IsUsable(Int_t i) const { return fClusters[i] && !fClusters[i]->IsUsed();}
90 Bool_t IsStandAlone() const { return TestBit(kStandAlone);}
92 Float_t GetC() const { return fC; }
93 Float_t GetChi2() const { return fChi2; }
94 inline Float_t GetChi2Z() const;
95 inline Float_t GetChi2Y() const;
96 inline Float_t GetChi2Phi() const;
97 static void GetClusterXY(const AliTRDcluster *c, Double_t &x, Double_t &y);
98 void GetCovAt(Double_t x, Double_t *cov) const;
99 void GetCovXY(Double_t *cov) const { memcpy(cov, &fCov[0], 3*sizeof(Double_t));}
100 void GetCovRef(Double_t *cov) const { memcpy(cov, &fRefCov, 3*sizeof(Double_t));}
101 static Double_t GetCovSqrt(Double_t *c, Double_t *d);
102 static Double_t GetCovInv(Double_t *c, Double_t *d);
103 Float_t GetdX() const { return fdX;}
104 Float_t* GetdEdx() { return &fdEdx[0];}
105 Float_t GetdQdl(Int_t ic) const;
106 Float_t GetdYdX() const { return fYfit[1]; }
107 Float_t GetdZdX() const { return fZref[1]; }
108 Int_t GetdY() const { return Int_t(GetY()/0.014);}
109 Int_t GetDetector() const { return fDet;}
110 void GetCalibParam(Float_t &exb, Float_t &vd, Float_t &t0, Float_t &s2, Float_t &dl, Float_t &dt) const {
111 exb = fExB; vd = fVD; t0 = fT0; s2 = fS2PRF; dl = fDiffL; dt = fDiffT;}
112 AliTRDcluster* GetClusters(Int_t i) const { return i<0 || i>=kNclusters ? 0x0 : fClusters[i];}
113 Int_t GetIndexes(Int_t i) const{ return i<0 || i>=kNclusters ? -1 : fIndexes[i];}
114 Int_t GetLabels(Int_t i) const { return fLabels[i];}
115 Double_t GetMomentum() const { return fMom;}
116 Int_t GetN() const { return (Int_t)fN&0x1f;}
117 Int_t GetN2() const { return GetN();}
118 Int_t GetNUsed() const { return Int_t((fN>>5)&0x1f);}
119 Int_t GetNShared() const { return Int_t((fN>>10)&0x1f);}
120 Float_t GetQuality(Bool_t kZcorr) const;
121 Float_t GetPadLength() const { return fPad[0];}
122 Float_t GetPadWidth() const { return fPad[1];}
123 Int_t GetPlane() const { return AliTRDgeometry::GetLayer(fDet); }
125 Float_t* GetProbability(Bool_t force=kFALSE);
126 inline Double_t GetPID(Int_t is=-1) const;
127 Float_t GetS2Y() const { return fS2Y;}
128 Float_t GetS2Z() const { return fS2Z;}
129 Float_t GetSigmaY() const { return fS2Y > 0. ? TMath::Sqrt(fS2Y) : 0.2;}
130 Float_t GetSnp() const { return fYref[1]/TMath::Sqrt(1+fYref[1]*fYref[1]);}
131 Float_t GetTgl() const { return fZref[1];}
132 Float_t GetTilt() const { return fPad[2];}
133 UInt_t GetTrackletWord() const { return 0;}
134 Float_t GetX0() const { return fX0;}
135 Float_t GetX() const { return fX0 - fX;}
136 Float_t GetY() const { return fYfit[0] - fYfit[1] * fX;}
137 Double_t GetYat(Double_t x) const { return fYfit[0] - fYfit[1] * (fX0-x);}
138 Float_t GetYfit(Int_t id) const { return fYfit[id];}
139 Float_t GetYref(Int_t id) const { return fYref[id];}
140 Float_t GetZ() const { return fZfit[0] - fZfit[1] * fX;}
141 Double_t GetZat(Double_t x) const { return fZfit[0] - fZfit[1] * (fX0-x);}
142 Float_t GetZfit(Int_t id) const { return fZfit[id];}
143 Float_t GetZref(Int_t id) const { return fZref[id];}
144 Int_t GetYbin() const { return Int_t(GetY()/0.016);}
145 Int_t GetZbin() const { return Int_t(GetZ()/fPad[0]);}
147 inline AliTRDcluster* NextCluster();
148 inline AliTRDcluster* PrevCluster();
149 void Print(Option_t *o = "") const;
150 inline void ResetClusterIter(Bool_t forward = kTRUE);
153 void SetC(Float_t c) { fC = c;}
154 void SetChi2(Float_t chi2) { fChi2 = chi2;}
155 void SetCovRef(const Double_t *cov) { memcpy(&fRefCov[0], cov, 3*sizeof(Double_t));}
156 void SetIndexes(Int_t i, Int_t idx) { fIndexes[i] = idx; }
157 void SetLabels(Int_t *lbls) { memcpy(fLabels, lbls, 3*sizeof(Int_t)); }
158 void SetKink(Bool_t k) { SetBit(kKink, k);}
159 void SetStandAlone(Bool_t st) { SetBit(kStandAlone, st); }
160 void SetMomentum(Double_t mom){ fMom = mom;}
162 void SetPadPlane(AliTRDpadPlane *p);
163 void SetPadLength(Float_t l) { fPad[0] = l;}
164 void SetPadWidth(Float_t w) { fPad[1] = w;}
165 void SetTilt(Float_t tilt) { fPad[2] = tilt; }
166 void SetDetector(Int_t d) { fDet = d; }
167 void SetDX(Float_t inDX) { fdX = inDX;}
168 void SetReconstructor(const AliTRDReconstructor *rec) {fReconstructor = rec;}
169 void SetX0(Float_t x0) { fX0 = x0; }
170 void SetYref(Int_t i, Float_t y) { fYref[i] = y;}
171 void SetZref(Int_t i, Float_t z) { fZref[i] = z;}
172 // void SetUsabilityMap(Long_t um) { fUsable = um; }
173 void UpDate(const AliTRDtrackV1* trk);
178 void Copy(TObject &ref) const;
181 inline void SetN(Int_t n);
182 inline void SetNUsed(Int_t n);
183 inline void SetNShared(Int_t n);
185 const AliTRDReconstructor *fReconstructor;//! local reconstructor
186 AliTRDcluster **fClusterIter; //! clusters iterator
187 Int_t fIndexes[kNclusters]; //! Indexes
188 Float_t fExB; //! tg(a_L) @ tracklet location
189 Float_t fVD; //! drift velocity @ tracklet location
190 Float_t fT0; //! time 0 @ tracklet location
191 Float_t fS2PRF; //! sigma^2 PRF for xd->0 and phi=a_L
192 Float_t fDiffL; //! longitudinal diffusion coefficient
193 Float_t fDiffT; //! transversal diffusion coefficient
194 Char_t fClusterIdx; //! clusters iterator
195 UShort_t fN; // number of clusters attached/used/shared
196 Short_t fDet; // TRD detector
197 AliTRDcluster *fClusters[kNclusters]; // Clusters
198 Float_t fPad[3]; // local pad definition : length/width/tilt
199 Float_t fYref[2]; // Reference y
200 Float_t fZref[2]; // Reference z
201 Float_t fYfit[2]; // Y fit position +derivation
202 Float_t fZfit[2]; // Z fit position
203 Float_t fMom; // Momentum estimate @ tracklet [GeV/c]
204 Float_t fdX; // length of time bin
205 Float_t fX0; // anode wire position
206 Float_t fX; // radial position of the tracklet
207 Float_t fY; // r-phi position of the tracklet
208 Float_t fZ; // z position of the tracklet
209 Float_t fS2Y; // estimated resolution in the r-phi direction
210 Float_t fS2Z; // estimated resolution in the z direction
211 Float_t fC; // Curvature
212 Float_t fChi2; // Global chi2
213 Float_t fdEdx[kNslices]; // dE/dx measurements for tracklet
214 Float_t fProb[AliPID::kSPECIES]; // PID probabilities
215 Int_t fLabels[3]; // most frequent MC labels and total number of different labels
216 Double_t fRefCov[3]; // covariance matrix of the track in the yz plane
217 Double_t fCov[3]; // covariance matrix of the tracklet in the xy plane
219 ClassDef(AliTRDseedV1, 6) // The offline TRD tracklet
222 //____________________________________________________________
223 inline Float_t AliTRDseedV1::GetChi2Z() const
225 Double_t dz = fZref[0]-fZfit[0]; dz*=dz;
226 Double_t cov[3]; GetCovAt(fX, cov);
227 Double_t s2 = fRefCov[2]+cov[2];
228 return s2 > 0. ? dz/s2 : 0.;
231 //____________________________________________________________
232 inline Float_t AliTRDseedV1::GetChi2Y() const
234 Double_t dy = fYref[0]-fYfit[0]; dy*=dy;
235 Double_t cov[3]; GetCovAt(fX, cov);
236 Double_t s2 = fRefCov[0]+cov[0];
237 return s2 > 0. ? dy/s2 : 0.;
240 //____________________________________________________________
241 inline Float_t AliTRDseedV1::GetChi2Phi() const
243 Double_t dphi = fYref[1]-fYfit[1]; dphi*=dphi;
244 Double_t cov[3]; GetCovAt(fX, cov);
245 Double_t s2 = fRefCov[2]+cov[2];
246 return s2 > 0. ? dphi/s2 : 0.;
249 //____________________________________________________________
250 inline Double_t AliTRDseedV1::GetPID(Int_t is) const
252 if(is<0) return fProb[AliPID::kElectron];
253 if(is<AliPID::kSPECIES) return fProb[is];
257 //____________________________________________________________
258 inline void AliTRDseedV1::Init(const AliRieman *rieman)
260 fZref[0] = rieman->GetZat(fX0);
261 fZref[1] = rieman->GetDZat(fX0);
262 fYref[0] = rieman->GetYat(fX0);
263 fYref[1] = rieman->GetDYat(fX0);
265 fChi2 = rieman->GetChi2();
268 //____________________________________________________________
269 inline AliTRDcluster* AliTRDseedV1::NextCluster()
271 // Mimic the usage of STL iterators.
274 fClusterIdx++; fClusterIter++;
275 while(fClusterIdx < kNclusters){
276 if(!(*fClusterIter)){
281 return *fClusterIter;
286 //____________________________________________________________
287 inline AliTRDcluster* AliTRDseedV1::PrevCluster()
289 // Mimic the usage of STL iterators.
292 fClusterIdx--; fClusterIter--;
293 while(fClusterIdx >= 0){
294 if(!(*fClusterIter)){
299 return *fClusterIter;
304 //____________________________________________________________
305 inline void AliTRDseedV1::ResetClusterIter(Bool_t forward)
307 // Mimic the usage of STL iterators.
308 // Facilitate the usage of NextCluster for forward like
309 // iterator (kTRUE) and PrevCluster for backward like iterator (kFALSE)
312 fClusterIter = &fClusters[0]; fClusterIter--;
315 fClusterIter = &fClusters[kNclusters-1]; fClusterIter++;
316 fClusterIdx=kNclusters;
320 //____________________________________________________________
321 inline void AliTRDseedV1::SetN(Int_t n)
323 if(n<0 || n>= (1<<5)) return;
328 //____________________________________________________________
329 inline void AliTRDseedV1::SetNUsed(Int_t n)
331 if(n<0 || n>= (1<<5)) return;
336 //____________________________________________________________
337 inline void AliTRDseedV1::SetNShared(Int_t n)
339 if(n<0 || n>= (1<<5)) return;