4 /* Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
5 * See cxx source for full Copyright notice */
7 #include <AliKalmanTrack.h>
10 #include "AliTRDgeometry.h"
11 #include "AliESDtrack.h"
17 class AliTrackReference;
19 const unsigned kMAX_CLUSTERS_PER_TRACK=210;
21 class AliTRDtracklet :public TObject{
22 friend class AliTRDtrack;
25 void Set(Float_t x, Float_t y, Float_t z, Float_t alpha, Float_t error2){fX=x; fY=y; fZ=z; fAlpha=alpha; fSigma2= error2;}
26 void SetP0(Float_t p0){fP0=p0;}
27 void SetP1(Float_t p1){fP1=p1;}
28 void SetN(Int_t n){fNFound=n;}
29 void SetNCross(Int_t nc){fNCross=nc;}
30 void SetPlane(Int_t plane){fPlane=plane;}
31 void SetSigma2(Float_t sigma2){fExpectedSigma2=sigma2;}
32 void SetChi2(Float_t chi2){fChi2=chi2;}
33 void SetTilt(Float_t tilt){fTilt=tilt;}
34 void SetMaxPos(Short_t pos, Short_t pos4, Short_t pos5){fMaxPos = pos; fMaxPos4 = pos4; fMaxPos5 = pos5;}
35 Float_t GetX() const { return fX;}
36 Float_t GetY() const { return fY;}
37 Float_t GetZ() const {return fZ;}
38 Float_t GetAlpha() const { return fAlpha;}
39 Float_t GetTrackletSigma2() const { return fSigma2;}
41 Float_t GetP0() const {return fP0;}
42 Float_t GetP1() const {return fP1;}
43 Int_t GetN() const {return fNFound;}
44 Int_t GetNCross() const {return fNCross;}
45 Int_t GetPlane() const {return fPlane;}
46 Float_t GetClusterSigma2() const {return fExpectedSigma2;}
47 Float_t GetChi2() const {return fChi2;}
48 Float_t GetTilt() const {return fTilt;}
50 Float_t fY; // y position
51 Float_t fZ; // z position
52 Float_t fX; // x position
53 Float_t fAlpha; // rotation angle
54 Float_t fSigma2; // expected error of tracklet position
55 Float_t fP0; // offset in y
56 Float_t fP1; // offset in tangent
57 Int_t fNFound; // number of found clusters
58 Int_t fNCross; // number of crosses
59 Int_t fPlane; // plane number
60 Float_t fExpectedSigma2; // expected sigma of residual distribution of clusters
61 Float_t fChi2; // chi2 of the tracklet
62 Float_t fTilt; // tilt factor
63 Short_t fMaxPos; // time bin with max charge
64 Short_t fMaxPos4; // time bin with max charge
65 Short_t fMaxPos5; // time bin with max charge
66 ClassDef(AliTRDtracklet,2)
70 class AliTRDtrack : public AliKalmanTrack {
72 // Represents reconstructed TRD track
73 friend class AliTRDtracker;
76 AliTRDtrack():AliKalmanTrack(){fBackupTrack=0;}
77 AliTRDtrack(const AliTRDcluster *c, UInt_t index, const Double_t xx[5],
78 const Double_t cc[15], Double_t xr, Double_t alpha);
79 AliTRDtrack(const AliTRDtrack& t);
80 AliTRDtrack(const AliKalmanTrack& t, Double_t alpha);
81 AliTRDtrack(const AliESDtrack& t);
82 static AliTRDtrack * MakeTrack(const AliTrackReference *ref, Double_t mass);
84 Int_t Compare(const TObject *o) const;
85 void CookdEdx(Double_t low=0.05, Double_t up=0.7);
86 Float_t StatusForTOF();
87 Double_t GetAlpha() const {return fAlpha;}
88 Int_t GetSector() const {
89 //if (fabs(fAlpha) < AliTRDgeometry::GetAlpha()/2) return 0;
90 return Int_t(TVector2::Phi_0_2pi(fAlpha)/AliTRDgeometry::GetAlpha())%AliTRDgeometry::kNsect;}
92 Double_t GetC() const {return fC;}
93 Int_t GetClusterIndex(Int_t i) const {return fIndex[i];}
94 Float_t GetClusterdQdl(Int_t i) const {return fdQdl[i];}
96 void GetCovariance(Double_t cov[15]) const;
97 Double_t GetdEdx() const {return fdEdx;}
98 Double_t GetPIDsignal() const {return GetdEdx();}
99 Float_t GetPIDsignals(Int_t i) const {return fdEdxPlane[i];}
100 Int_t GetPIDTimBin(Int_t i) const {return fTimBinPlane[i];}
101 Double_t GetEta() const {return fE;}
103 void GetExternalCovariance(Double_t cov[15]) const ;
104 void GetExternalParameters(Double_t& xr, Double_t x[5]) const ;
106 Double_t GetLikelihoodElectron() const { return fLhElectron; };
108 Double_t Get1Pt() const {
109 return (TMath::Sign(1e-9,fC) + fC)*GetLocalConvConst();
111 Double_t GetP() const {
112 return TMath::Abs(GetPt())*sqrt(1.+GetTgl()*GetTgl());
114 Double_t GetPredictedChi2(const AliTRDcluster*, Double_t h01) const ;
115 Double_t GetPt() const {return 1./Get1Pt();}
116 void GetPxPyPz(Double_t &px, Double_t &py, Double_t &pz) const ;
117 void GetGlobalXYZ(Double_t &x, Double_t &y, Double_t &z) const ;
118 Int_t GetSeedLabel() const { return fSeedLab; }
119 Double_t GetSigmaC2() const {return fCcc;}
120 Double_t GetSigmaTgl2() const {return fCtt;}
121 Double_t GetSigmaY2() const {return fCyy;}
122 Double_t GetSigmaZ2() const {return fCzz;}
123 Double_t GetSnp() const {return fX*fC - fE;}
124 Double_t GetTgl() const {return fT;}
125 Double_t GetX() const {return fX;}
126 Double_t GetY() const {return fY;}
127 Double_t GetZ() const {return fZ;}
128 UInt_t * GetBackupIndexes() {return fIndexBackup;}
129 UInt_t * GetIndexes() {return fIndex;}
130 Double_t GetYat(Double_t xk) const {
131 //-----------------------------------------------------------------
132 // This function calculates the Y-coordinate of a track at the plane x=xk.
133 // Needed for matching with the TOF (I.Belikov)
134 //-----------------------------------------------------------------
135 Double_t c1=fC*fX - fE, r1=TMath::Sqrt(1.- c1*c1);
136 Double_t c2=fC*xk - fE, r2=TMath::Sqrt(1.- c2*c2);
137 return fY + (xk-fX)*(c1+c2)/(r1+r2);
139 Int_t GetProlongation(Double_t xk, Double_t &y, Double_t &z);
141 void SetStop(Bool_t stop) {fStopped=stop;}
142 Bool_t GetStop() const {return fStopped;}
144 Int_t PropagateTo(Double_t xr, Double_t x0=8.72, Double_t rho=5.86e-3);
145 Int_t PropagateToX(Double_t xr, Double_t step);
146 Int_t PropagateToR(Double_t xr, Double_t step);
147 void ResetCovariance();
148 void ResetCovariance(Float_t mult);
149 void ResetClusters() { SetChi2(0.); SetNumberOfClusters(0); }
150 Int_t Rotate(Double_t angle, Bool_t absolute=kFALSE);
152 void SetdEdx(Float_t dedx) {fdEdx=dedx;}
153 void SetPIDsignals(Float_t dedx, Int_t i) {fdEdxPlane[i]=dedx;}
154 void SetPIDTimBin(Int_t timbin, Int_t i) {fTimBinPlane[i]=timbin;}
155 void SetLikelihoodElectron(Float_t l) { fLhElectron = l; };
157 void SetSampledEdx(Float_t q, Int_t i) {
158 Double_t s=GetSnp(), t=GetTgl();
159 q*= TMath::Sqrt((1-s*s)/(1+t*t));
162 void SetSampledEdx(Float_t q) {
163 Double_t s=GetSnp(), t=GetTgl();
164 q*= TMath::Sqrt((1-s*s)/(1+t*t));
169 void SetSeedLabel(Int_t lab) { fSeedLab=lab; }
171 Int_t Update(const AliTRDcluster* c, Double_t chi2, UInt_t i,
173 Int_t UpdateMI(const AliTRDcluster* c, Double_t chi2, UInt_t i,
174 Double_t h01, Int_t plane);
175 Int_t UpdateMI(const AliTRDtracklet & tracklet);
178 void AddNWrong() {fNWrong++;}
180 Int_t GetNWrong() const {return fNWrong;}
181 Int_t GetNRotate() const {return fNRotate;}
182 Int_t GetNCross() const {return fNCross;}
183 void IncCross() {fNCross++; if (fBackupTrack) fBackupTrack->IncCross();}
184 AliTRDtrack * GetBackupTrack(){return fBackupTrack;}
185 void MakeBackupTrack();
190 void GetXYZ(Float_t r[3]) const;
192 Double_t GetPredictedChi2(const AliCluster*/*c*/) const {return 0.;}
193 Int_t Update(const AliCluster*/*c*/, Double_t /*chi2*/, UInt_t /*i*/) {
197 Int_t fSeedLab; // track label taken from seeding
198 Float_t fdEdx; // dE/dx
199 Float_t fdEdxT; // dE/dx - truncated mean
200 Float_t fDE; // integrated delta energy
201 Float_t fdEdxPlane[kNPlane]; // dE/dx from all 6 planes
202 Int_t fTimBinPlane[kNPlane]; // time bin of Max cluster from all 6 planes
204 Double_t fAlpha; // rotation angle
205 Double_t fX; // running local X-coordinate of the track (time bin)
206 Bool_t fStopped; // track stop indication
208 Double_t fY; // Y-coordinate of the track
209 Double_t fZ; // Z-coordinate of the track
211 Double_t fT; // tangent of the track momentum dip angle
212 Double_t fC; // track curvature
214 Double_t fCyy; // covariance
215 Double_t fCzy, fCzz; // matrix
216 Double_t fCey, fCez, fCee; // of the
217 Double_t fCty, fCtz, fCte, fCtt; // track
218 Double_t fCcy, fCcz, fCce, fCct, fCcc; // parameters
220 UInt_t fIndex[kMAX_CLUSTERS_PER_TRACK]; // global indexes of clusters
221 UInt_t fIndexBackup[kMAX_CLUSTERS_PER_TRACK]; //backup indexes of clusters - used in iterations
222 Float_t fdQdl[kMAX_CLUSTERS_PER_TRACK]; // cluster amplitudes corrected
225 Float_t fLhElectron; // Likelihood to be an electron
226 Int_t fNWrong; // number of wrong clusters
227 Int_t fNRotate; // number of rotation
228 Int_t fNCross; // number of the cross materials
229 Int_t fNExpected; //expected number of cluster
230 Int_t fNLast; //number of clusters in last 2 layers
231 Int_t fNExpectedLast; //number of expected clusters on last 2 layers
232 Int_t fNdedx; //number of clusters for dEdx measurment
233 Float_t fChi2Last; //chi2 in the last 2 layers
234 AliTRDtracklet fTracklets[6]; //tracklets
235 Float_t fBudget[3]; // integrated material budget
236 AliTRDtrack * fBackupTrack; //! backup track
237 ClassDef(AliTRDtrack,3) // TRD reconstructed tracks
240 inline void AliTRDtrack::GetXYZ(Float_t r[3]) const {
241 //---------------------------------------------------------------------
242 // Returns the position of the track in the global coord. system
243 //---------------------------------------------------------------------
244 Double_t cs=TMath::Cos(fAlpha), sn=TMath::Sin(fAlpha);
245 r[0]=fX*cs - fY*sn; r[1]=fX*sn + fY*cs; r[2]=fZ;