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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 "AliVTrack.h" | |
24 | ||
25 | const Double_t kVeryBig=1./kAlmost0; | |
26 | const Double_t kMostProbablePt=0.35; | |
27 | ||
28 | Double_t ApproximateBetheBloch(Double_t); | |
29 | ||
30 | class AliVVertex; | |
31 | class TPolyMarker3D; | |
32 | ||
33 | class AliExternalTrackParam: public AliVTrack { | |
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 | AliExternalTrackParam(const AliVTrack *vTrack); | |
41 | AliExternalTrackParam(Double_t xyz[3],Double_t pxpypz[3], | |
42 | Double_t cv[21],Short_t sign); | |
43 | virtual ~AliExternalTrackParam(){} | |
44 | ||
45 | void Set(Double_t x,Double_t alpha, | |
46 | const Double_t param[5], const Double_t covar[15]); | |
47 | void Set(Double_t xyz[3],Double_t pxpypz[3],Double_t cv[21],Short_t sign); | |
48 | ||
49 | static void SetMostProbablePt(Double_t pt) { fgMostProbablePt=pt; } | |
50 | static Double_t GetMostProbablePt() { return fgMostProbablePt; } | |
51 | ||
52 | void Reset(); | |
53 | void ResetCovariance(Double_t s2); | |
54 | void AddCovariance(const Double_t cov[15]); | |
55 | ||
56 | const Double_t *GetParameter() const {return fP;} | |
57 | const Double_t *GetCovariance() const {return fC;} | |
58 | ||
59 | Double_t GetAlpha() const {return fAlpha;} | |
60 | Double_t GetX() const {return fX;} | |
61 | Double_t GetY() const {return fP[0];} | |
62 | Double_t GetZ() const {return fP[1];} | |
63 | Double_t GetSnp() const {return fP[2];} | |
64 | Double_t GetTgl() const {return fP[3];} | |
65 | Double_t GetSigned1Pt() const {return fP[4];} | |
66 | ||
67 | Double_t GetSigmaY2() const {return fC[0];} | |
68 | Double_t GetSigmaZY() const {return fC[1];} | |
69 | Double_t GetSigmaZ2() const {return fC[2];} | |
70 | Double_t GetSigmaSnpY() const {return fC[3];} | |
71 | Double_t GetSigmaSnpZ() const {return fC[4];} | |
72 | Double_t GetSigmaSnp2() const {return fC[5];} | |
73 | Double_t GetSigmaTglY() const {return fC[6];} | |
74 | Double_t GetSigmaTglZ() const {return fC[7];} | |
75 | Double_t GetSigmaTglSnp() const {return fC[8];} | |
76 | Double_t GetSigmaTgl2() const {return fC[9];} | |
77 | Double_t GetSigma1PtY() const {return fC[10];} | |
78 | Double_t GetSigma1PtZ() const {return fC[11];} | |
79 | Double_t GetSigma1PtSnp() const {return fC[12];} | |
80 | Double_t GetSigma1PtTgl() const {return fC[13];} | |
81 | Double_t GetSigma1Pt2() const {return fC[14];} | |
82 | ||
83 | // additional functions for AliVParticle | |
84 | Double_t Px() const; | |
85 | Double_t Py() const; | |
86 | Double_t Pz() const; | |
87 | Double_t Pt() const { return TMath::Abs(GetSignedPt()); } | |
88 | Double_t P() const { return GetP(); } | |
89 | Bool_t PxPyPz(Double_t p[3]) const { return GetPxPyPz(p); } | |
90 | ||
91 | Double_t Xv() const; | |
92 | Double_t Yv() const; | |
93 | Double_t Zv() const; | |
94 | Bool_t XvYvZv(Double_t x[3]) const { return GetXYZ(x); } | |
95 | ||
96 | Double_t OneOverPt() const { return 1./Pt(); } | |
97 | Double_t Phi() const; | |
98 | Double_t Theta() const; | |
99 | virtual Double_t E() const; | |
100 | virtual Double_t M() const; | |
101 | Double_t Eta() const; | |
102 | virtual Double_t Y() const; | |
103 | Short_t Charge() const { return (Short_t)GetSign(); } | |
104 | const Double_t *PID() const { return 0x0; } | |
105 | ||
106 | // additional functions from AliVTrack | |
107 | virtual Int_t GetID() const { return -999; } | |
108 | virtual UChar_t GetITSClusterMap() const {return 0; } | |
109 | virtual ULong_t GetStatus() const { return 0; } | |
110 | ||
111 | Double_t GetSign() const {return (fP[4]>0) ? 1 : -1;} | |
112 | Double_t GetP() const; | |
113 | Double_t GetSignedPt() const { | |
114 | return (TMath::Abs(fP[4])>kAlmost0) ? 1./fP[4]:TMath::Sign(kVeryBig,fP[4]); | |
115 | } | |
116 | Double_t Get1P() const; | |
117 | Double_t GetC(Double_t b) const {return fP[4]*b*kB2C;} | |
118 | void GetDZ(Double_t x,Double_t y,Double_t z,Double_t b,Float_t dz[2]) const; | |
119 | Double_t GetD(Double_t xv, Double_t yv, Double_t b) const; | |
120 | Double_t GetLinearD(Double_t xv, Double_t yv) const; | |
121 | Bool_t CorrectForMeanMaterial(Double_t xOverX0, Double_t xTimesRho, | |
122 | Double_t mass, Bool_t anglecorr=kFALSE, | |
123 | Double_t (*f)(Double_t)=ApproximateBetheBloch); | |
124 | Double_t GetPredictedChi2(Double_t p[2],Double_t cov[3]) const; | |
125 | ||
126 | Double_t | |
127 | GetPredictedChi2(Double_t p[3],Double_t covyz[3],Double_t covxyz[3]) const; | |
128 | Bool_t | |
129 | PropagateTo(Double_t p[3],Double_t covyz[3],Double_t covxyz[3],Double_t b); | |
130 | ||
131 | Double_t *GetResiduals(Double_t *p,Double_t *cov,Bool_t updated=kTRUE) const; | |
132 | Bool_t Update(Double_t p[2],Double_t cov[3]); | |
133 | Bool_t Rotate(Double_t alpha); | |
134 | Bool_t PropagateTo(Double_t x, Double_t b); | |
135 | Bool_t Propagate(Double_t alpha, Double_t x, Double_t b) { | |
136 | if (Rotate(alpha)) | |
137 | if (PropagateTo(x,b)) return kTRUE; | |
138 | return kFALSE; | |
139 | } | |
140 | void Propagate(Double_t len,Double_t x[3],Double_t p[3],Double_t bz) const; | |
141 | Bool_t Intersect(Double_t pnt[3], Double_t norm[3], Double_t bz) const; | |
142 | ||
143 | void GetHelixParameters(Double_t h[6], Double_t b) const; | |
144 | Double_t GetDCA(const AliExternalTrackParam *p, Double_t b, | |
145 | Double_t &xthis,Double_t &xp) const; | |
146 | Double_t PropagateToDCA(AliExternalTrackParam *p, Double_t b); | |
147 | Bool_t PropagateToDCA(const AliVVertex *vtx, Double_t b, Double_t maxd, | |
148 | Double_t dz[2]=0, Double_t cov[3]=0); | |
149 | ||
150 | void GetDirection(Double_t d[3]) const; | |
151 | Bool_t GetPxPyPz(Double_t *p) const; | |
152 | Bool_t GetXYZ(Double_t *p) const; | |
153 | Bool_t GetCovarianceXYZPxPyPz(Double_t cv[21]) const; | |
154 | Bool_t GetPxPyPzAt(Double_t x, Double_t b, Double_t p[3]) const; | |
155 | Bool_t GetXYZAt(Double_t x, Double_t b, Double_t r[3]) const; | |
156 | Bool_t GetYAt(Double_t x, Double_t b, Double_t &y) const; | |
157 | Bool_t GetZAt(Double_t x, Double_t b, Double_t &z) const; | |
158 | void Print(Option_t* option = "") const; | |
159 | Double_t GetSnpAt(Double_t x,Double_t b) const; | |
160 | ||
161 | //Deprecated | |
162 | Bool_t CorrectForMaterial(Double_t d, Double_t x0, Double_t mass, | |
163 | Double_t (*f)(Double_t)=ApproximateBetheBloch); | |
164 | ||
165 | Bool_t GetDistance(AliExternalTrackParam *param2, Double_t x, Double_t dist[3], Double_t b); | |
166 | Int_t GetIndex(Int_t i, Int_t j) const {return i+(j+1)*j/2;} | |
167 | Int_t GetLabel() const {return -1;} | |
168 | // | |
169 | // visualization (M. Ivanov) | |
170 | // | |
171 | virtual void FillPolymarker(TPolyMarker3D *pol, Float_t magf, Float_t minR, Float_t maxR, Float_t stepR); | |
172 | virtual void DrawTrack(Float_t magF, Float_t minR, Float_t maxR, Float_t stepR); | |
173 | protected: | |
174 | Double_t &Par(Int_t i) {return fP[i];} | |
175 | Double_t &Cov(Int_t i) {return fC[i];} | |
176 | ||
177 | private: | |
178 | Double32_t fX; // X coordinate for the point of parametrisation | |
179 | Double32_t fAlpha; // Local <-->global coor.system rotation angle | |
180 | Double32_t fP[5]; // The track parameters | |
181 | Double32_t fC[15]; // The track parameter covariance matrix | |
182 | ||
183 | static Double32_t fgMostProbablePt; // "Most probable" pt | |
184 | // (to be used if Bz=0) | |
185 | ClassDef(AliExternalTrackParam, 8) | |
186 | }; | |
187 | ||
188 | inline void AliExternalTrackParam::ResetCovariance(Double_t s2) { | |
189 | // | |
190 | // Reset the covarince matrix to "something big" | |
191 | // | |
192 | fC[0]*= s2; | |
193 | fC[1] = 0.; fC[2]*= s2; | |
194 | fC[3] = 0.; fC[4] = 0.; fC[5]*= s2; | |
195 | fC[6] = 0.; fC[7] = 0.; fC[8] = 0.; fC[9]*= s2; | |
196 | fC[10]= 0.; fC[11]= 0.; fC[12]= 0.; fC[13]= 0.; fC[14]*=s2; | |
197 | } | |
198 | ||
199 | ||
200 | ||
201 | ||
202 | #endif |