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;
45 class AliTRDseedV1 : public AliTRDtrackletBase
48 enum ETRDtrackletBuffers {
49 kNtb = 31 // max clusters/pad row
50 ,kNclusters = 2*kNtb // max number of clusters/tracklet
51 ,kNslices = 10 // max dEdx slices
54 // bits from 0-13 are reserved by ROOT (see TObject.h)
55 enum ETRDtrackletStatus {
56 kOwner = BIT(14) // owner of its clusters
57 ,kRowCross = BIT(15) // pad row cross tracklet
58 ,kCalib = BIT(16) // calibrated tracklet
59 ,kKink = BIT(17) // kink prolongation tracklet
60 ,kStandAlone = BIT(18)
63 AliTRDseedV1(Int_t det = -1);
65 AliTRDseedV1(const AliTRDseedV1 &ref);
66 AliTRDseedV1& operator=(const AliTRDseedV1 &ref);
68 /* Bool_t AttachClustersIter(
69 AliTRDtrackingChamber *chamber, Float_t quality,
70 Bool_t kZcorr = kFALSE, AliTRDcluster *c=0x0);*/
71 Bool_t AttachClusters(
72 AliTRDtrackingChamber *chamber, Bool_t tilt = kFALSE);
73 void Bootstrap(const AliTRDReconstructor *rec);
75 void CookdEdx(Int_t nslices);
78 Bool_t Fit(Bool_t tilt=kTRUE, Int_t errors = 2);
80 Bool_t Init(AliTRDtrackV1 *track);
81 inline void Init(const AliRieman *fit);
82 Bool_t IsEqual(const TObject *inTracklet) const;
83 Bool_t IsCalibrated() const { return TestBit(kCalib);}
84 Bool_t IsOwner() const { return TestBit(kOwner);}
85 Bool_t IsKink() const { return TestBit(kKink);}
86 Bool_t IsOK() const { return GetN() > 4 && GetNUsed() < 4;}
87 Bool_t IsRowCross() const { return TestBit(kRowCross);}
88 Bool_t IsUsable(Int_t i) const { return fClusters[i] && !fClusters[i]->IsUsed();}
89 Bool_t IsStandAlone() const { return TestBit(kStandAlone);}
91 Float_t GetC() const { return fC; }
92 Float_t GetChi2() const { return fChi2; }
93 inline Float_t GetChi2Z() const;
94 inline Float_t GetChi2Y() const;
95 inline Float_t GetChi2Phi() const;
96 static void GetClusterXY(const AliTRDcluster *c, Double_t &x, Double_t &y);
97 void GetCovAt(Double_t x, Double_t *cov) const;
98 void GetCovXY(Double_t *cov) const { memcpy(cov, &fCov[0], 3*sizeof(Double_t));}
99 void GetCovRef(Double_t *cov) const { memcpy(cov, &fRefCov[0], 3*sizeof(Double_t));}
100 Float_t GetdX() const { return fdX;}
101 Float_t* GetdEdx() { return &fdEdx[0];}
102 Float_t GetdQdl(Int_t ic) const;
103 Float_t GetdYdX() const { return fYfit[1]; }
104 Float_t GetdZdX() const { return fZref[1]; }
105 Int_t GetdY() const { return Int_t(GetY()/0.014);}
106 Int_t GetDetector() const { return fDet;}
107 void GetCalibParam(Float_t &exb, Float_t &vd, Float_t &t0, Float_t &s2, Float_t &dl, Float_t &dt) const {
108 exb = fExB; vd = fVD; t0 = fT0; s2 = fS2PRF; dl = fDiffL; dt = fDiffT;}
109 AliTRDcluster* GetClusters(Int_t i) const { return i<0 || i>=kNclusters ? 0x0 : fClusters[i];}
110 Int_t GetIndexes(Int_t i) const{ return i<0 || i>=kNclusters ? -1 : fIndexes[i];}
111 Int_t GetLabels(Int_t i) const { return fLabels[i];}
112 Double_t GetMomentum() const { return fMom;}
113 Int_t GetN() const { return (Int_t)fN&0x1f;}
114 Int_t GetN2() const { return GetN();}
115 Int_t GetNUsed() const { return Int_t((fN>>5)&0x1f);}
116 Int_t GetNShared() const { return Int_t((fN>>10)&0x1f);}
117 Float_t GetQuality(Bool_t kZcorr) const;
118 Float_t GetPadLength() const { return fPadLength;}
119 Int_t GetPlane() const { return AliTRDgeometry::GetLayer(fDet); }
121 Float_t* GetProbability(Bool_t force=kFALSE);
122 inline Double_t GetPID(Int_t is=-1) const;
123 Float_t GetS2Y() const { return fS2Y;}
124 Float_t GetS2Z() const { return fS2Z;}
125 Float_t GetSigmaY() const { return fS2Y > 0. ? TMath::Sqrt(fS2Y) : 0.2;}
126 Float_t GetSnp() const { return fYref[1]/TMath::Sqrt(1+fYref[1]*fYref[1]);}
127 Float_t GetTgl() const { return fZref[1];}
128 Float_t GetTilt() const { return fTilt;}
129 UInt_t GetTrackletWord() const { return 0;}
130 Float_t GetX0() const { return fX0;}
131 Float_t GetX() const { return fX0 - fX;}
132 Float_t GetY() const { return fYfit[0] - fYfit[1] * fX;}
133 Double_t GetYat(Double_t x) const { return fYfit[0] - fYfit[1] * (fX0-x);}
134 Float_t GetYfit(Int_t id) const { return fYfit[id];}
135 Float_t GetYref(Int_t id) const { return fYref[id];}
136 Float_t GetZ() const { return fZfit[0] - fZfit[1] * fX;}
137 Double_t GetZat(Double_t x) const { return fZfit[0] - fZfit[1] * (fX0-x);}
138 Float_t GetZfit(Int_t id) const { return fZfit[id];}
139 Float_t GetZref(Int_t id) const { return fZref[id];}
140 Int_t GetYbin() const { return Int_t(GetY()/0.016);}
141 Int_t GetZbin() const { return Int_t(GetZ()/fPadLength);}
143 inline AliTRDcluster* NextCluster();
144 inline AliTRDcluster* PrevCluster();
145 void Print(Option_t *o = "") const;
146 inline void ResetClusterIter(Bool_t forward = kTRUE);
149 void SetC(Float_t c) { fC = c;}
150 void SetChi2(Float_t chi2) { fChi2 = chi2;}
151 void SetCovRef(const Double_t *cov) { memcpy(&fRefCov[0], cov, 3*sizeof(Double_t));}
152 void SetIndexes(Int_t i, Int_t idx) { fIndexes[i] = idx; }
153 void SetLabels(Int_t *lbls) { memcpy(fLabels, lbls, 3*sizeof(Int_t)); }
154 void SetKink(Bool_t k) { SetBit(kKink, k);}
155 void SetStandAlone(Bool_t st) { SetBit(kStandAlone, st); }
156 void SetMomentum(Double_t mom){ fMom = mom;}
158 void SetTilt(Float_t tilt) { fTilt = tilt; }
159 void SetPadLength(Float_t len){ fPadLength = len;}
160 void SetDetector(Int_t d) { fDet = d; }
161 void SetDX(Float_t inDX) { fdX = inDX;}
162 void SetReconstructor(const AliTRDReconstructor *rec) {fReconstructor = rec;}
163 void SetX0(Float_t x0) { fX0 = x0; }
164 void SetYref(Int_t i, Float_t y) { fYref[i] = y;}
165 void SetZref(Int_t i, Float_t z) { fZref[i] = z;}
166 // void SetUsabilityMap(Long_t um) { fUsable = um; }
167 void UpDate(const AliTRDtrackV1* trk);
172 void Copy(TObject &ref) const;
175 inline void SetN(Int_t n);
176 inline void SetNUsed(Int_t n);
177 inline void SetNShared(Int_t n);
179 const AliTRDReconstructor *fReconstructor;//! local reconstructor
180 AliTRDcluster **fClusterIter; //! clusters iterator
181 Int_t fIndexes[kNclusters]; //! Indexes
182 Float_t fExB; //! tg(a_L) @ tracklet location
183 Float_t fVD; //! drift velocity @ tracklet location
184 Float_t fT0; //! time 0 @ tracklet location
185 Float_t fS2PRF; //! sigma^2 PRF for xd->0 and phi=a_L
186 Float_t fDiffL; //! longitudinal diffusion coefficient
187 Float_t fDiffT; //! transversal diffusion coefficient
188 Char_t fClusterIdx; //! clusters iterator
189 // ULong_t fUsable; //! bit map of usable clusters
190 UShort_t fN; // number of clusters attached/used/shared
191 Short_t fDet; // TRD detector
192 Float_t fTilt; // local tg of the tilt angle
193 Float_t fPadLength; // local pad length
194 AliTRDcluster *fClusters[kNclusters]; // Clusters
195 Float_t fYref[2]; // Reference y
196 Float_t fZref[2]; // Reference z
197 Float_t fYfit[2]; // Y fit position +derivation
198 Float_t fZfit[2]; // Z fit position
199 Float_t fMom; // Momentum estimate @ tracklet [GeV/c]
200 Float_t fdX; // length of time bin
201 Float_t fX0; // anode wire position
202 Float_t fX; // radial position of the tracklet
203 Float_t fY; // r-phi position of the tracklet
204 Float_t fZ; // z position of the tracklet
205 Float_t fS2Y; // estimated resolution in the r-phi direction
206 Float_t fS2Z; // estimated resolution in the z direction
207 Float_t fC; // Curvature
208 Float_t fChi2; // Global chi2
209 Float_t fdEdx[kNslices]; // dE/dx measurements for tracklet
210 Float_t fProb[AliPID::kSPECIES]; // PID probabilities
211 Int_t fLabels[3]; // most frequent MC labels and total number of different labels
212 Double_t fRefCov[3]; // covariance matrix of the track in the yz plane
213 Double_t fCov[3]; // covariance matrix of the tracklet in the xy plane
215 ClassDef(AliTRDseedV1, 6) // The offline TRD tracklet
218 //____________________________________________________________
219 inline Float_t AliTRDseedV1::GetChi2Z() const
221 Double_t dz = fZref[0]-fZfit[0]; dz*=dz;
222 Double_t cov[3]; GetCovAt(fX, cov);
223 Double_t s2 = fRefCov[2]+cov[2];
224 return s2 > 0. ? dz/s2 : 0.;
227 //____________________________________________________________
228 inline Float_t AliTRDseedV1::GetChi2Y() const
230 Double_t dy = fYref[0]-fYfit[0]; dy*=dy;
231 Double_t cov[3]; GetCovAt(fX, cov);
232 Double_t s2 = fRefCov[0]+cov[0];
233 return s2 > 0. ? dy/s2 : 0.;
236 //____________________________________________________________
237 inline Float_t AliTRDseedV1::GetChi2Phi() const
239 Double_t dphi = fYref[1]-fYfit[1]; dphi*=dphi;
240 Double_t cov[3]; GetCovAt(fX, cov);
241 Double_t s2 = fRefCov[2]+cov[2];
242 return s2 > 0. ? dphi/s2 : 0.;
245 //____________________________________________________________
246 inline Double_t AliTRDseedV1::GetPID(Int_t is) const
248 if(is<0) return fProb[AliPID::kElectron];
249 if(is<AliPID::kSPECIES) return fProb[is];
253 //____________________________________________________________
254 inline void AliTRDseedV1::Init(const AliRieman *rieman)
256 fZref[0] = rieman->GetZat(fX0);
257 fZref[1] = rieman->GetDZat(fX0);
258 fYref[0] = rieman->GetYat(fX0);
259 fYref[1] = rieman->GetDYat(fX0);
261 fChi2 = rieman->GetChi2();
264 //____________________________________________________________
265 inline AliTRDcluster* AliTRDseedV1::NextCluster()
267 // Mimic the usage of STL iterators.
270 fClusterIdx++; fClusterIter++;
271 while(fClusterIdx < kNclusters){
272 if(!(*fClusterIter)){
277 return *fClusterIter;
282 //____________________________________________________________
283 inline AliTRDcluster* AliTRDseedV1::PrevCluster()
285 // Mimic the usage of STL iterators.
288 fClusterIdx--; fClusterIter--;
289 while(fClusterIdx >= 0){
290 if(!(*fClusterIter)){
295 return *fClusterIter;
300 //____________________________________________________________
301 inline void AliTRDseedV1::ResetClusterIter(Bool_t forward)
303 // Mimic the usage of STL iterators.
304 // Facilitate the usage of NextCluster for forward like
305 // iterator (kTRUE) and PrevCluster for backward like iterator (kFALSE)
308 fClusterIter = &fClusters[0]; fClusterIter--;
311 fClusterIter = &fClusters[kNclusters-1]; fClusterIter++;
312 fClusterIdx=kNclusters;
316 //____________________________________________________________
317 inline void AliTRDseedV1::SetN(Int_t n)
319 if(n<0 || n>= (1<<5)) return;
324 //____________________________________________________________
325 inline void AliTRDseedV1::SetNUsed(Int_t n)
327 if(n<0 || n>= (1<<5)) return;
332 //____________________________________________________________
333 inline void AliTRDseedV1::SetNShared(Int_t n)
335 if(n<0 || n>= (1<<5)) return;