3 /* Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
4 * See cxx source for full Copyright notice */
8 ////////////////////////////////////////////////////////////////////////////
10 // \class AliTRDseedV1
11 // \brief The TRD offline tracklet
12 // \author Alexandru Bercuci
14 ////////////////////////////////////////////////////////////////////////////
16 #ifndef ALITRDTRACKLETBASE_H
17 #include "AliTRDtrackletBase.h"
24 #ifndef ALITRDGEOMETRY_H
25 #include "AliTRDgeometry.h"
33 #ifndef ALITRDCLUSTER_H
34 #include "AliTRDcluster.h"
38 class TTreeSRedirector;
43 class AliTRDReconstructor;
44 class AliTRDtrackingChamber;
47 class AliTRDseedV1 : public AliTRDtrackletBase
49 friend class AliHLTTRDTracklet; // wrapper for HLT
52 enum ETRDtrackletBuffers {
53 kNbits = 6 // bits to store number of clusters
54 ,kMask = 0x3f // bit mask
55 ,kNtb = 31 // max clusters/pad row
56 ,kNclusters = 2*kNtb // max number of clusters/tracklet
57 ,kNslices = 10 // max dEdx slices
60 // bits from 0-13 are reserved by ROOT (see TObject.h)
61 enum ETRDtrackletStatus {
62 kOwner = BIT(14) // owner of its clusters
63 ,kRowCross = BIT(15) // pad row cross tracklet
64 ,kPID = BIT(16) // PID contributor
65 ,kCalib = BIT(17) // calibrated tracklet
66 ,kKink = BIT(18) // kink prolongation tracklet
67 ,kStandAlone = BIT(19) // tracklet build during stand alone track finding
68 ,kPrimary = BIT(20) // tracklet from a primary track candidate
71 enum ETRDtrackletError { // up to 8 bits
72 kAttachClFound = 0 // not enough clusters found
73 ,kAttachRowGap = 1 // found gap attached rows
74 ,kAttachRow = 2 // found 3 rows
75 ,kAttachMultipleCl= 3// multiple clusters attached to time bin
76 ,kAttachClAttach= 4 // not enough clusters attached
77 ,kFitCl = 5 // not enough clusters for fit
78 ,kFitFailedY = 6 // fit failed in XY plane failed
79 ,kFitFailedZ = 7 // fit in the QZ plane failed
82 AliTRDseedV1(Int_t det = -1);
84 AliTRDseedV1(const AliTRDseedV1 &ref);
85 AliTRDseedV1& operator=(const AliTRDseedV1 &ref);
87 Bool_t AttachClusters(AliTRDtrackingChamber *const chamber, Bool_t tilt = kFALSE, Bool_t ChgPlus=kTRUE, Int_t ev=-1);
88 void Bootstrap(const AliTRDReconstructor *rec);
90 void CookdEdx(Int_t nslices);
93 Bool_t Fit(UChar_t opt=0);
94 Bool_t FitRobust(Bool_t ChgPlus=kTRUE);
95 Bool_t Init(AliTRDtrackV1 *track);
96 void Init(const AliRieman *fit);
97 Bool_t IsEqual(const TObject *inTracklet) const;
98 Bool_t IsCalibrated() const { return TestBit(kCalib);}
99 Bool_t IsOwner() const { return TestBit(kOwner);}
100 Bool_t IsKink() const { return TestBit(kKink);}
101 Bool_t IsPrimary() const { return TestBit(kPrimary);}
102 Bool_t HasPID() const { return TestBit(kPID);}
103 Bool_t HasError(ETRDtrackletError err) const
104 { return TESTBIT(fErrorMsg, err);}
105 Bool_t IsOK() const { return GetN() > 4 && GetNUsed() < 4;}
106 Bool_t IsRowCross() const { return TestBit(kRowCross);}
107 Bool_t IsUsable(Int_t i) const { return fClusters[i] && !fClusters[i]->IsUsed();}
108 Bool_t IsStandAlone() const { return TestBit(kStandAlone);}
110 Float_t GetAnodeWireOffset(Float_t zt);
111 Float_t GetC(Int_t typ=0) const { return fC[typ]; }
112 Float_t GetCharge(Bool_t useOutliers=kFALSE) const;
113 Float_t GetChi2() const { return fChi2; }
114 inline Float_t GetChi2Z() const;
115 inline Float_t GetChi2Y() const;
116 inline Float_t GetChi2Phi() const;
117 void GetCovAt(Double_t x, Double_t *cov) const;
118 void GetCovXY(Double_t *cov) const { memcpy(cov, &fCov[0], 3*sizeof(Double_t));}
119 void GetCovRef(Double_t *cov) const { memcpy(cov, &fRefCov, 7*sizeof(Double_t));}
120 static Int_t GetCovSqrt(const Double_t * const c, Double_t *d);
121 static Double_t GetCovInv(const Double_t * const c, Double_t *d);
122 UChar_t GetErrorMsg() const { return fErrorMsg;}
123 Float_t GetdX() const { return fdX;}
124 const Float_t* GetdEdx() const { return &fdEdx[0];}
125 Float_t GetQperTB(Int_t tb) const;
126 Float_t GetdQdl() const;
127 Float_t GetdQdl(Int_t ic, Float_t *dx=NULL) const;
128 Float_t GetdYdX() const { return fYfit[1];}
129 Float_t GetdZdX() const { return fZfit[1];}
130 Int_t GetdY() const { return Int_t(GetY()/0.014);}
131 Int_t GetDetector() const { return fDet;}
132 void GetCalibParam(Float_t &exb, Float_t &vd, Float_t &t0, Float_t &s2, Float_t &dl, Float_t &dt) const {
133 exb = fExB; vd = fVD; t0 = fT0; s2 = fS2PRF; dl = fDiffL; dt = fDiffT;}
134 AliTRDcluster* GetClusters(Int_t i) const { return i<0 || i>=kNclusters ? NULL: fClusters[i];}
135 Bool_t GetEstimatedCrossPoint(Float_t &x, Float_t &z) const;
136 Int_t GetIndexes(Int_t i) const{ return i<0 || i>=kNclusters ? -1 : fIndexes[i];}
137 Int_t GetLabels(Int_t i) const { return fLabels[i];}
138 Float_t GetMomentum(Float_t *err = NULL) const;
139 Int_t GetN() const { return (Int_t)fN&kMask;}
140 Int_t GetN2() const { return GetN();}
141 Int_t GetNUsed() const { return Int_t((fN>>kNbits)&kMask);}
142 Int_t GetNShared() const { return Int_t(((fN>>kNbits)>>kNbits)&kMask);}
143 Int_t GetTBoccupancy() const;
144 Int_t GetTBcross() const;
145 Float_t GetQuality(Bool_t kZcorr) const;
146 Float_t GetPadLength() const { return fPad[0];}
147 Float_t GetPadWidth() const { return fPad[1];}
148 Int_t GetPlane() const { return AliTRDgeometry::GetLayer(fDet); }
150 Float_t* GetProbability(Bool_t force=kFALSE);
151 Float_t GetPt() const { return fPt; }
152 inline Double_t GetPID(Int_t is=-1) const;
153 Float_t GetS2Y() const { return fS2Y;}
154 Float_t GetS2Z() const { return fS2Z;}
155 Float_t GetSigmaY() const { return fS2Y > 0. ? TMath::Sqrt(fS2Y) : 0.2;}
156 Float_t GetSnp() const { return fYref[1]/TMath::Sqrt(1+fYref[1]*fYref[1]);}
157 Float_t GetTgl() const { return fZref[1]/TMath::Sqrt(1+fYref[1]*fYref[1]);}
158 Float_t GetTilt() const { return fPad[2];}
159 UInt_t GetTrackletWord() const { return 0;}
160 UShort_t GetVolumeId() const;
161 Float_t GetX0() const { return fX0;}
162 Float_t GetX() const { return fX0 - fX;}
163 Float_t GetY() const { return fYfit[0] - fYfit[1] * fX;}
164 Double_t GetYat(Double_t x) const { return fYfit[0] - fYfit[1] * (fX0-x);}
165 Float_t GetYfit(Int_t id) const { return fYfit[id];}
166 Float_t GetYref(Int_t id) const { return fYref[id];}
167 Float_t GetZ() const { return fZfit[0] - fZfit[1] * fX;}
168 Double_t GetZat(Double_t x) const { return fZfit[0] - fZfit[1] * (fX0-x);}
169 Float_t GetZfit(Int_t id) const { return fZfit[id];}
170 Float_t GetZref(Int_t id) const { return fZref[id];}
171 Int_t GetYbin() const { return Int_t(GetY()/0.016);}
172 Int_t GetZbin() const { return Int_t(GetZ()/fPad[0]);}
174 inline AliTRDcluster* NextCluster();
175 inline AliTRDcluster* PrevCluster();
176 void Print(Option_t *o = "") const;
177 inline void ResetClusterIter(Bool_t forward = kTRUE);
178 void Reset(Option_t *opt="");
180 void SetC(Float_t c, Int_t typ=0) { fC[typ] = c;}
181 void SetChi2(Float_t chi2) { fChi2 = chi2;}
182 inline void SetCovRef(const Double_t *cov);
183 void SetErrorMsg(ETRDtrackletError err) { SETBIT(fErrorMsg, err);}
184 void SetIndexes(Int_t i, Int_t idx) { fIndexes[i] = idx; }
185 void SetLabels(Int_t *lbls) { memcpy(fLabels, lbls, 3*sizeof(Int_t)); }
186 void SetKink(Bool_t k = kTRUE){ SetBit(kKink, k);}
187 void SetPrimary(Bool_t k = kTRUE){ SetBit(kPrimary, k);}
188 void SetPID(Bool_t k = kTRUE) { SetBit(kPID, k);}
189 void SetStandAlone(Bool_t st) { SetBit(kStandAlone, st); }
190 void SetPt(Double_t pt) { fPt = pt;}
192 void SetPadPlane(AliTRDpadPlane * const p);
193 void SetPadLength(Float_t l) { fPad[0] = l;}
194 void SetPadWidth(Float_t w) { fPad[1] = w;}
195 void SetTilt(Float_t tilt) { fPad[2] = tilt; }
196 void SetDetector(Int_t d) { fDet = d; }
197 void SetDX(Float_t inDX) { fdX = inDX;}
198 void SetReconstructor(const AliTRDReconstructor *rec) {fkReconstructor = rec;}
199 void SetX0(Float_t x0) { fX0 = x0; }
200 void SetYref(Int_t i, Float_t y) { fYref[i] = y;}
201 void SetZref(Int_t i, Float_t z) { fZref[i] = z;}
202 // void SetUsabilityMap(Long_t um) { fUsable = um; }
203 void Update(const AliTRDtrackV1* trk);
208 void Copy(TObject &ref) const;
211 inline void SetN(Int_t n);
212 inline void SetNUsed(Int_t n);
213 inline void SetNShared(Int_t n);
214 inline void Swap(Int_t &n1, Int_t &n2) const;
215 inline void Swap(Double_t &d1, Double_t &d2) const;
217 const AliTRDReconstructor *fkReconstructor;//! local reconstructor
218 AliTRDcluster **fClusterIter; //! clusters iterator
219 Int_t fIndexes[kNclusters]; //! Indexes
220 Float_t fExB; // tg(a_L) @ tracklet location
221 Float_t fVD; // drift velocity @ tracklet location
222 Float_t fT0; // time 0 @ tracklet location
223 Float_t fS2PRF; // sigma^2 PRF for xd->0 and phi=a_L
224 Float_t fDiffL; // longitudinal diffusion coefficient
225 Float_t fDiffT; // transversal diffusion coefficient
226 Char_t fClusterIdx; //! clusters iterator
227 UChar_t fErrorMsg; // processing error
228 UInt_t fN; // number of clusters attached/used/shared
229 Short_t fDet; // TRD detector
230 AliTRDcluster *fClusters[kNclusters]; // Clusters
231 Float_t fPad[4]; // local pad definition : length/width/tilt/anode wire offset
232 Float_t fYref[2]; // Reference y, dydx
233 Float_t fZref[2]; // Reference z, dz/dx
234 Float_t fYfit[2]; // Fit y, dy/dx
235 Float_t fZfit[2]; // Fit z
236 Float_t fPt; // Pt estimate @ tracklet [GeV/c]
237 Float_t fdX; // length of time bin
238 Float_t fX0; // anode wire position
239 Float_t fX; // radial position of the tracklet
240 Float_t fY; // r-phi position of the tracklet
241 Float_t fZ; // z position of the tracklet
242 Float_t fS2Y; // estimated resolution in the r-phi direction
243 Float_t fS2Z; // estimated resolution in the z direction
244 Float_t fC[2]; // Curvature for standalone [0] rieman [1] vertex constrained
245 Float_t fChi2; // Global chi2
246 Float_t fdEdx[kNslices]; // dE/dx measurements for tracklet
247 Float_t fProb[AliPID::kSPECIES]; // PID probabilities
248 Int_t fLabels[3]; // most frequent MC labels and total number of different labels
249 Double_t fRefCov[7]; // covariance matrix of the track in the yz plane + the rest of the diagonal elements
250 Double_t fCov[3]; // covariance matrix of the tracklet in the xy plane
252 ClassDef(AliTRDseedV1, 12) // The offline TRD tracklet
255 //____________________________________________________________
256 inline Float_t AliTRDseedV1::GetChi2Z() const
258 Double_t dz = fZref[0]-fZfit[0]; dz*=dz;
259 Double_t cov[3]; GetCovAt(fX, cov);
260 Double_t s2 = fRefCov[2]+cov[2];
261 return s2 > 0. ? dz/s2 : 0.;
264 //____________________________________________________________
265 inline Float_t AliTRDseedV1::GetChi2Y() const
267 Double_t dy = fYref[0]-fYfit[0]; dy*=dy;
268 Double_t cov[3]; GetCovAt(fX, cov);
269 Double_t s2 = fRefCov[0]+cov[0];
270 return s2 > 0. ? dy/s2 : 0.;
273 //____________________________________________________________
274 inline Float_t AliTRDseedV1::GetChi2Phi() const
276 Double_t dphi = fYref[1]-fYfit[1]; dphi*=dphi;
277 Double_t cov[3]; GetCovAt(fX, cov);
278 Double_t s2 = fRefCov[2]+cov[2];
279 return s2 > 0. ? dphi/s2 : 0.;
284 //____________________________________________________________
285 inline Double_t AliTRDseedV1::GetPID(Int_t is) const
287 if(is<0) return fProb[AliPID::kElectron];
288 if(is<AliPID::kSPECIES) return fProb[is];
292 //____________________________________________________________
293 inline AliTRDcluster* AliTRDseedV1::NextCluster()
295 // Mimic the usage of STL iterators.
298 fClusterIdx++; fClusterIter++;
299 while(fClusterIdx < kNclusters){
300 if(!(*fClusterIter)){
305 return *fClusterIter;
310 //____________________________________________________________
311 inline AliTRDcluster* AliTRDseedV1::PrevCluster()
313 // Mimic the usage of STL iterators.
316 fClusterIdx--; fClusterIter--;
317 while(fClusterIdx >= 0){
318 if(!(*fClusterIter)){
323 return *fClusterIter;
328 //____________________________________________________________
329 inline void AliTRDseedV1::ResetClusterIter(Bool_t forward)
331 // Mimic the usage of STL iterators.
332 // Facilitate the usage of NextCluster for forward like
333 // iterator (kTRUE) and PrevCluster for backward like iterator (kFALSE)
336 fClusterIter = &fClusters[0]; fClusterIter--;
339 fClusterIter = &fClusters[kNclusters-1]; fClusterIter++;
340 fClusterIdx=kNclusters;
344 //____________________________________________________________
345 inline void AliTRDseedV1::SetCovRef(const Double_t *cov)
347 // Copy some "important" covariance matrix elements
352 // cov(tgl, 1/pt) var(1/pt)
354 memcpy(&fRefCov[0], cov, 3*sizeof(Double_t)); // yz full covariance
355 fRefCov[3] = cov[ 5]; // snp variance
356 fRefCov[4] = cov[ 9]; // tgl variance
357 fRefCov[5] = cov[13]; // cov(tgl, 1/pt)
358 fRefCov[6] = cov[14]; // 1/pt variance
362 //____________________________________________________________
363 inline void AliTRDseedV1::SetN(Int_t n)
365 if(n<0 || n>kNclusters) return;
370 //____________________________________________________________
371 inline void AliTRDseedV1::SetNUsed(Int_t n)
373 if(n<0 || n>kNclusters) return;
374 UInt_t mask(kMask<<kNbits);
376 n=n<<kNbits; fN |= (n&mask);
379 //____________________________________________________________
380 inline void AliTRDseedV1::SetNShared(Int_t n)
382 if(n<0 || n>kNclusters) return;
383 UInt_t mask((kMask<<kNbits)<<kNbits);
385 n = (n<<kNbits)<<kNbits; fN|=(n&mask);
388 //____________________________________________________________
389 inline void AliTRDseedV1::Swap(Int_t &n1, Int_t &n2) const
391 // swap values of n1 with n2
396 //____________________________________________________________
397 inline void AliTRDseedV1::Swap(Double_t &d1, Double_t &d2) const
399 // swap values of d1 with d2