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1#ifndef ALIEXTERNALTRACKPARAM_H
2#define ALIEXTERNALTRACKPARAM_H
3/* Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
4 * See cxx source for full Copyright notice */
5
6/* $Id$ */
7
8/*****************************************************************************
9 * "External" track parametrisation class *
10 * *
11 * external param0: local Y-coordinate of a track (cm) *
12 * external param1: local Z-coordinate of a track (cm) *
13 * external param2: local sine of the track momentum azimuthal angle *
14 * external param3: tangent of the track momentum dip angle *
15 * external param4: 1/pt (1/(GeV/c)) *
16 * *
17 * The parameters are estimated at an exact position x in a local coord. *
18 * system rotated by angle alpha with respect to the global coord.system. *
19 * Origin: I.Belikov, CERN, Jouri.Belikov@cern.ch *
20 *****************************************************************************/
21#include "TMath.h"
22
23#include "AliVParticle.h"
24
25const Double_t kVeryBig=1./kAlmost0;
26const Double_t kMostProbablePt=0.35;
27
28Double_t ApproximateBetheBloch(Double_t);
29
30class AliESDVertex;
31class TPolyMarker3D;
32
33class AliExternalTrackParam: public AliVParticle {
34 public:
35 AliExternalTrackParam();
36 AliExternalTrackParam(const AliExternalTrackParam &);
37 AliExternalTrackParam& operator=(const AliExternalTrackParam & trkPar);
38 AliExternalTrackParam(Double_t x, Double_t alpha,
39 const Double_t param[5], const Double_t covar[15]);
40 virtual ~AliExternalTrackParam(){}
41
42 void Set(Double_t x,Double_t alpha,
43 const Double_t param[5], const Double_t covar[15]);
44
45 static void SetMostProbablePt(Double_t pt) { fgMostProbablePt=pt; }
46 static Double_t GetMostProbablePt() { return fgMostProbablePt; }
47
48 void Reset();
49 void ResetCovariance(Double_t s2);
50
51 const Double_t *GetParameter() const {return fP;}
52 const Double_t *GetCovariance() const {return fC;}
53
54 Double_t GetAlpha() const {return fAlpha;}
55 Double_t GetX() const {return fX;}
56 Double_t GetY() const {return fP[0];}
57 Double_t GetZ() const {return fP[1];}
58 Double_t GetSnp() const {return fP[2];}
59 Double_t GetTgl() const {return fP[3];}
60 Double_t GetSigned1Pt() const {return fP[4];}
61
62 Double_t GetSigmaY2() const {return fC[0];}
63 Double_t GetSigmaZY() const {return fC[1];}
64 Double_t GetSigmaZ2() const {return fC[2];}
65 Double_t GetSigmaSnpY() const {return fC[3];}
66 Double_t GetSigmaSnpZ() const {return fC[4];}
67 Double_t GetSigmaSnp2() const {return fC[5];}
68 Double_t GetSigmaTglY() const {return fC[6];}
69 Double_t GetSigmaTglZ() const {return fC[7];}
70 Double_t GetSigmaTglSnp() const {return fC[8];}
71 Double_t GetSigmaTgl2() const {return fC[9];}
72 Double_t GetSigma1PtY() const {return fC[10];}
73 Double_t GetSigma1PtZ() const {return fC[11];}
74 Double_t GetSigma1PtSnp() const {return fC[12];}
75 Double_t GetSigma1PtTgl() const {return fC[13];}
76 Double_t GetSigma1Pt2() const {return fC[14];}
77
78 // additional functions for AliVParticle
79 Double_t Px() const;
80 Double_t Py() const;
81 Double_t Pz() const;
82 Double_t Pt() const { return TMath::Abs(GetSignedPt()); }
83 Double_t P() const { return GetP(); }
84 Bool_t PxPyPz(Double_t p[3]) const { return GetPxPyPz(p); }
85
86 Double_t Xv() const;
87 Double_t Yv() const;
88 Double_t Zv() const;
89 Bool_t XvYvZv(Double_t x[3]) const { return GetXYZ(x); }
90
91 Double_t OneOverPt() const { return 1./Pt(); }
92 Double_t Phi() const;
93 Double_t Theta() const;
94 virtual Double_t E() const;
95 virtual Double_t M() const;
96 Double_t Eta() const;
97 virtual Double_t Y() const;
98 Short_t Charge() const { return (Short_t)GetSign(); }
99 const Double_t *PID() const { return 0x0; }
100
101 Double_t GetSign() const {return (fP[4]>0) ? 1 : -1;}
102 Double_t GetP() const;
103 Double_t GetSignedPt() const {
104 return (TMath::Abs(fP[4])>kAlmost0) ? 1./fP[4]:TMath::Sign(kVeryBig,fP[4]);
105 }
106 Double_t Get1P() const;
107 Double_t GetC(Double_t b) const {return fP[4]*b*kB2C;}
108 void GetDZ(Double_t x,Double_t y,Double_t z,Double_t b,Float_t dz[2]) const;
109 Double_t GetD(Double_t xv, Double_t yv, Double_t b) const;
110 Double_t GetLinearD(Double_t xv, Double_t yv) const;
111 Bool_t CorrectForMeanMaterial(Double_t xOverX0, Double_t xTimesRho,
112 Double_t mass, Bool_t anglecorr=kFALSE,
113 Double_t (*f)(Double_t)=ApproximateBetheBloch);
114 Double_t GetPredictedChi2(Double_t p[2],Double_t cov[3]) const;
115
116 Double_t
117 GetPredictedChi2(Double_t p[3],Double_t covyz[3],Double_t covxyz[3]) const;
118 Bool_t
119 PropagateTo(Double_t p[3],Double_t covyz[3],Double_t covxyz[3],Double_t b);
120
121 Double_t *GetResiduals(Double_t *p,Double_t *cov,Bool_t updated=kTRUE) const;
122 Bool_t Update(Double_t p[2],Double_t cov[3]);
123 Bool_t Rotate(Double_t alpha);
124 Bool_t PropagateTo(Double_t x, Double_t b);
125 Bool_t Propagate(Double_t alpha, Double_t x, Double_t b) {
126 if (Rotate(alpha))
127 if (PropagateTo(x,b)) return kTRUE;
128 return kFALSE;
129 }
130 void Propagate(Double_t len,Double_t x[3],Double_t p[3],Double_t bz) const;
131 Bool_t Intersect(Double_t pnt[3], Double_t norm[3], Double_t bz) const;
132
133 void GetHelixParameters(Double_t h[6], Double_t b) const;
134 Double_t GetDCA(const AliExternalTrackParam *p, Double_t b,
135 Double_t &xthis,Double_t &xp) const;
136 Double_t PropagateToDCA(AliExternalTrackParam *p, Double_t b);
137 Bool_t PropagateToDCA(const AliESDVertex *vtx, Double_t b, Double_t maxd,
138 Double_t dz[2]=0, Double_t cov[3]=0);
139
140 void GetDirection(Double_t d[3]) const;
141 Bool_t GetPxPyPz(Double_t *p) const;
142 Bool_t GetXYZ(Double_t *p) const;
143 Bool_t GetCovarianceXYZPxPyPz(Double_t cv[21]) const;
144 Bool_t GetPxPyPzAt(Double_t x, Double_t b, Double_t p[3]) const;
145 Bool_t GetXYZAt(Double_t x, Double_t b, Double_t r[3]) const;
146 Bool_t GetYAt(Double_t x, Double_t b, Double_t &y) const;
147 Bool_t GetZAt(Double_t x, Double_t b, Double_t &z) const;
148 void Print(Option_t* option = "") const;
149 Double_t GetSnpAt(Double_t x,Double_t b) const;
150
151 //Deprecated
152 Bool_t CorrectForMaterial(Double_t d, Double_t x0, Double_t mass,
153 Double_t (*f)(Double_t)=ApproximateBetheBloch);
154
155 Bool_t GetDistance(AliExternalTrackParam *param2, Double_t x, Double_t dist[3], Double_t b);
156 Int_t GetIndex(Int_t i, Int_t j) const {return i+(j+1)*j/2;}
157 //
158 // visualization (M. Ivanov)
159 //
160 virtual void FillPolymarker(TPolyMarker3D *pol, Float_t magf, Float_t minR, Float_t maxR, Float_t stepR);
161 virtual void DrawTrack(Float_t magF, Float_t minR, Float_t maxR, Float_t stepR);
162 protected:
163 Double_t &Par(Int_t i) {return fP[i];}
164 Double_t &Cov(Int_t i) {return fC[i];}
165
166 private:
167 Double32_t fX; // X coordinate for the point of parametrisation
168 Double32_t fAlpha; // Local <-->global coor.system rotation angle
169 Double32_t fP[5]; // The track parameters
170 Double32_t fC[15]; // The track parameter covariance matrix
171
172 static Double32_t fgMostProbablePt; // "Most probable" pt
173 // (to be used if Bz=0)
174 ClassDef(AliExternalTrackParam, 7)
175};
176
177inline void AliExternalTrackParam::ResetCovariance(Double_t s2) {
178 //
179 // Reset the covarince matrix to "something big"
180 //
181 fC[0]*= s2;
182 fC[1] = 0.; fC[2]*= s2;
183 fC[3] = 0.; fC[4] = 0.; fC[5]*= s2;
184 fC[6] = 0.; fC[7] = 0.; fC[8] = 0.; fC[9]*= s2;
185 fC[10]= 0.; fC[11]= 0.; fC[12]= 0.; fC[13]= 0.; fC[14]*=s2;
186}
187
188
189
190
191#endif