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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 | class AliVVertex; | |
29 | class TPolyMarker3D; | |
30 | ||
31 | class AliExternalTrackParam: public AliVTrack { | |
32 | public: | |
33 | AliExternalTrackParam(); | |
34 | AliExternalTrackParam(const AliExternalTrackParam &); | |
35 | AliExternalTrackParam& operator=(const AliExternalTrackParam & trkPar); | |
36 | AliExternalTrackParam(Double_t x, Double_t alpha, | |
37 | const Double_t param[5], const Double_t covar[15]); | |
38 | AliExternalTrackParam(const AliVTrack *vTrack); | |
39 | AliExternalTrackParam(Double_t xyz[3],Double_t pxpypz[3], | |
40 | Double_t cv[21],Short_t sign); | |
41 | virtual ~AliExternalTrackParam(){} | |
42 | ||
43 | template <typename T> | |
44 | void Set(T x, T alpha, const T param[5], const T covar[15]) { | |
45 | // Sets the parameters | |
46 | fX=x; fAlpha=alpha; | |
47 | for (Int_t i = 0; i < 5; i++) fP[i] = param[i]; | |
48 | for (Int_t i = 0; i < 15; i++) fC[i] = covar[i]; | |
49 | } | |
50 | ||
51 | void Set(Double_t xyz[3],Double_t pxpypz[3],Double_t cv[21],Short_t sign); | |
52 | ||
53 | static void SetMostProbablePt(Double_t pt) { fgMostProbablePt=pt; } | |
54 | static Double_t GetMostProbablePt() { return fgMostProbablePt; } | |
55 | ||
56 | void Reset(); | |
57 | void ResetCovariance(Double_t s2); | |
58 | void AddCovariance(const Double_t cov[15]); | |
59 | ||
60 | const Double_t *GetParameter() const {return fP;} | |
61 | const Double_t *GetCovariance() const {return fC;} | |
62 | ||
63 | Double_t GetAlpha() const {return fAlpha;} | |
64 | Double_t GetX() const {return fX;} | |
65 | Double_t GetY() const {return fP[0];} | |
66 | Double_t GetZ() const {return fP[1];} | |
67 | Double_t GetSnp() const {return fP[2];} | |
68 | Double_t GetTgl() const {return fP[3];} | |
69 | Double_t GetSigned1Pt() const {return fP[4];} | |
70 | ||
71 | Double_t GetSigmaY2() const {return fC[0];} | |
72 | Double_t GetSigmaZY() const {return fC[1];} | |
73 | Double_t GetSigmaZ2() const {return fC[2];} | |
74 | Double_t GetSigmaSnpY() const {return fC[3];} | |
75 | Double_t GetSigmaSnpZ() const {return fC[4];} | |
76 | Double_t GetSigmaSnp2() const {return fC[5];} | |
77 | Double_t GetSigmaTglY() const {return fC[6];} | |
78 | Double_t GetSigmaTglZ() const {return fC[7];} | |
79 | Double_t GetSigmaTglSnp() const {return fC[8];} | |
80 | Double_t GetSigmaTgl2() const {return fC[9];} | |
81 | Double_t GetSigma1PtY() const {return fC[10];} | |
82 | Double_t GetSigma1PtZ() const {return fC[11];} | |
83 | Double_t GetSigma1PtSnp() const {return fC[12];} | |
84 | Double_t GetSigma1PtTgl() const {return fC[13];} | |
85 | Double_t GetSigma1Pt2() const {return fC[14];} | |
86 | ||
87 | // additional functions for AliVParticle | |
88 | Double_t Px() const; | |
89 | Double_t Py() const; | |
90 | Double_t Pz() const; | |
91 | Double_t Pt() const { return TMath::Abs(GetSignedPt()); } | |
92 | Double_t P() const { return GetP(); } | |
93 | Bool_t PxPyPz(Double_t p[3]) const { return GetPxPyPz(p); } | |
94 | ||
95 | Double_t Xv() const; | |
96 | Double_t Yv() const; | |
97 | Double_t Zv() const; | |
98 | Bool_t XvYvZv(Double_t x[3]) const { return GetXYZ(x); } | |
99 | ||
100 | Double_t OneOverPt() const { return 1./Pt(); } | |
101 | Double_t Phi() const; | |
102 | Double_t Theta() const; | |
103 | virtual Double_t E() const; | |
104 | virtual Double_t M() const; | |
105 | Double_t Eta() const; | |
106 | virtual Double_t Y() const; | |
107 | virtual Short_t Charge() const { return (Short_t)GetSign(); } | |
108 | virtual const Double_t *PID() const { return 0x0; } | |
109 | ||
110 | // additional functions from AliVTrack | |
111 | virtual Int_t GetID() const { return -999; } | |
112 | virtual UChar_t GetITSClusterMap() const {return 0; } | |
113 | virtual ULong_t GetStatus() const { return 0; } | |
114 | ||
115 | Double_t GetSign() const {return (fP[4]>0) ? 1 : -1;} | |
116 | Double_t GetP() const; | |
117 | Double_t GetSignedPt() const { | |
118 | return (TMath::Abs(fP[4])>kAlmost0) ? 1./fP[4]:TMath::Sign(kVeryBig,fP[4]); | |
119 | } | |
120 | Double_t Get1P() const; | |
121 | virtual Double_t GetC(Double_t b) const {return fP[4]*b*kB2C;} | |
122 | void GetDZ(Double_t x,Double_t y,Double_t z,Double_t b,Float_t dz[2]) const; | |
123 | Double_t GetD(Double_t xv, Double_t yv, Double_t b) const; | |
124 | Double_t GetLinearD(Double_t xv, Double_t yv) const; | |
125 | Bool_t CorrectForMeanMaterial(Double_t xOverX0, Double_t xTimesRho, | |
126 | Double_t mass, Bool_t anglecorr=kFALSE, | |
127 | Double_t (*f)(Double_t)=AliExternalTrackParam::BetheBlochSolid); | |
128 | ||
129 | // | |
130 | // Bethe-Bloch formula parameterizations | |
131 | // | |
132 | static Double_t BetheBlochAleph(Double_t bg, | |
133 | Double_t kp1=0.76176e-1, | |
134 | Double_t kp2=10.632, | |
135 | Double_t kp3=0.13279e-4, | |
136 | Double_t kp4=1.8631, | |
137 | Double_t kp5=1.9479 | |
138 | ); | |
139 | static Double_t BetheBlochGeant(Double_t bg, | |
140 | Double_t kp0=2.33, | |
141 | Double_t kp1=0.20, | |
142 | Double_t kp2=3.00, | |
143 | Double_t kp3=173e-9, | |
144 | Double_t kp4=0.49848 | |
145 | ); | |
146 | ||
147 | static Double_t BetheBlochSolid(Double_t bg); | |
148 | static Double_t BetheBlochGas(Double_t bg); | |
149 | ||
150 | Double_t GetPredictedChi2(Double_t p[2],Double_t cov[3]) const; | |
151 | ||
152 | Double_t | |
153 | GetPredictedChi2(Double_t p[3],Double_t covyz[3],Double_t covxyz[3]) const; | |
154 | ||
155 | Double_t GetPredictedChi2(const AliExternalTrackParam *t) const; | |
156 | ||
157 | Bool_t | |
158 | PropagateTo(Double_t p[3],Double_t covyz[3],Double_t covxyz[3],Double_t b); | |
159 | ||
160 | Double_t *GetResiduals(Double_t *p,Double_t *cov,Bool_t updated=kTRUE) const; | |
161 | Bool_t Update(Double_t p[2],Double_t cov[3]); | |
162 | Bool_t Rotate(Double_t alpha); | |
163 | Bool_t PropagateTo(Double_t x, Double_t b); | |
164 | Bool_t Propagate(Double_t alpha, Double_t x, Double_t b); | |
165 | Bool_t PropagateBxByBz(Double_t alpha, Double_t x, Double_t b[3]); | |
166 | void Propagate(Double_t len,Double_t x[3],Double_t p[3],Double_t bz) const; | |
167 | Bool_t Intersect(Double_t pnt[3], Double_t norm[3], Double_t bz) const; | |
168 | ||
169 | static void g3helx3(Double_t qfield, Double_t step, Double_t vect[7]); | |
170 | Bool_t PropagateToBxByBz(Double_t x, const Double_t b[3]); | |
171 | ||
172 | void GetHelixParameters(Double_t h[6], Double_t b) const; | |
173 | Double_t GetDCA(const AliExternalTrackParam *p, Double_t b, | |
174 | Double_t &xthis,Double_t &xp) const; | |
175 | Double_t PropagateToDCA(AliExternalTrackParam *p, Double_t b); | |
176 | Bool_t PropagateToDCA(const AliVVertex *vtx, Double_t b, Double_t maxd, | |
177 | Double_t dz[2]=0, Double_t cov[3]=0); | |
178 | Bool_t PropagateToDCABxByBz(const AliVVertex *vtx, Double_t b[3], | |
179 | Double_t maxd, Double_t dz[2]=0, Double_t cov[3]=0); | |
180 | ||
181 | void GetDirection(Double_t d[3]) const; | |
182 | Bool_t GetPxPyPz(Double_t *p) const; | |
183 | Bool_t GetXYZ(Double_t *p) const; | |
184 | Bool_t GetCovarianceXYZPxPyPz(Double_t cv[21]) const; | |
185 | Bool_t GetPxPyPzAt(Double_t x, Double_t b, Double_t p[3]) const; | |
186 | Bool_t GetXYZAt(Double_t x, Double_t b, Double_t r[3]) const; | |
187 | Bool_t GetYAt(Double_t x, Double_t b, Double_t &y) const; | |
188 | Bool_t GetZAt(Double_t x, Double_t b, Double_t &z) const; | |
189 | void Print(Option_t* option = "") const; | |
190 | Double_t GetSnpAt(Double_t x,Double_t b) const; | |
191 | ||
192 | //Deprecated | |
193 | Bool_t CorrectForMaterial(Double_t d, Double_t x0, Double_t mass, | |
194 | Double_t (*f)(Double_t)=AliExternalTrackParam::BetheBlochSolid); | |
195 | ||
196 | Bool_t GetDistance(AliExternalTrackParam *param2, Double_t x, Double_t dist[3], Double_t b); | |
197 | Int_t GetIndex(Int_t i, Int_t j) const; | |
198 | Int_t GetLabel() const {return -1;} | |
199 | // | |
200 | // visualization (M. Ivanov) | |
201 | // | |
202 | virtual void FillPolymarker(TPolyMarker3D *pol, Float_t magf, Float_t minR, Float_t maxR, Float_t stepR); | |
203 | virtual void DrawTrack(Float_t magF, Float_t minR, Float_t maxR, Float_t stepR); | |
204 | ||
205 | virtual Bool_t Translate(Double_t *vTrasl,Double_t *covV); | |
206 | ||
207 | protected: | |
208 | Double_t &Par(Int_t i) {return fP[i];} | |
209 | Double_t &Cov(Int_t i) {return fC[i];} | |
210 | ||
211 | private: | |
212 | Double32_t fX; // X coordinate for the point of parametrisation | |
213 | Double32_t fAlpha; // Local <-->global coor.system rotation angle | |
214 | Double32_t fP[5]; // The track parameters | |
215 | Double32_t fC[15]; // The track parameter covariance matrix | |
216 | ||
217 | static Double32_t fgMostProbablePt; // "Most probable" pt | |
218 | // (to be used if Bz=0) | |
219 | ClassDef(AliExternalTrackParam, 8) | |
220 | }; | |
221 | ||
222 | inline void AliExternalTrackParam::ResetCovariance(Double_t s2) { | |
223 | // | |
224 | // Reset the covarince matrix to "something big" | |
225 | // | |
226 | fC[0]*= s2; | |
227 | fC[1] = 0.; fC[2]*= s2; | |
228 | fC[3] = 0.; fC[4] = 0.; fC[5]*= s2; | |
229 | fC[6] = 0.; fC[7] = 0.; fC[8] = 0.; fC[9]*= s2; | |
230 | fC[10]= 0.; fC[11]= 0.; fC[12]= 0.; fC[13]= 0.; fC[14]*=s2; | |
231 | } | |
232 | ||
233 | ||
234 | ||
235 | ||
236 | #endif |