]>
Commit | Line | Data |
---|---|---|
51ad6848 | 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 | ||
49d13e89 | 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 | *****************************************************************************/ | |
6c94f330 | 21 | #include "TMath.h" |
a5e407e9 | 22 | |
4f6e22bd | 23 | #include "AliVTrack.h" |
def9660e | 24 | |
49d13e89 | 25 | const Double_t kVeryBig=1./kAlmost0; |
7b5ef2e6 | 26 | const Double_t kMostProbablePt=0.35; |
5773defd | 27 | |
58e536c5 | 28 | class AliVVertex; |
0c19adf7 | 29 | class TPolyMarker3D; |
c683ddc2 | 30 | |
86be8934 | 31 | const Double_t kC0max=100*100, // SigmaY<=100cm |
32 | kC2max=100*100, // SigmaZ<=100cm | |
33 | kC5max=1*1, // SigmaSin<=1 | |
34 | kC9max=1*1, // SigmaTan<=1 | |
35 | kC14max=100*100; // Sigma1/Pt<=100 1/GeV | |
36 | ||
4f6e22bd | 37 | class AliExternalTrackParam: public AliVTrack { |
51ad6848 | 38 | public: |
39 | AliExternalTrackParam(); | |
6c94f330 | 40 | AliExternalTrackParam(const AliExternalTrackParam &); |
def9660e | 41 | AliExternalTrackParam& operator=(const AliExternalTrackParam & trkPar); |
51ad6848 | 42 | AliExternalTrackParam(Double_t x, Double_t alpha, |
43 | const Double_t param[5], const Double_t covar[15]); | |
4f6e22bd | 44 | AliExternalTrackParam(const AliVTrack *vTrack); |
da4e3deb | 45 | AliExternalTrackParam(Double_t xyz[3],Double_t pxpypz[3], |
46 | Double_t cv[21],Short_t sign); | |
1530f89c | 47 | virtual ~AliExternalTrackParam(){} |
ac3eaff4 | 48 | |
1443179a | 49 | template <typename T> |
50 | void Set(T x, T alpha, const T param[5], const T covar[15]) { | |
51 | // Sets the parameters | |
52 | fX=x; fAlpha=alpha; | |
53 | for (Int_t i = 0; i < 5; i++) fP[i] = param[i]; | |
54 | for (Int_t i = 0; i < 15; i++) fC[i] = covar[i]; | |
86be8934 | 55 | |
56 | CheckCovariance(); | |
57 | ||
1443179a | 58 | } |
59 | ||
4f6e22bd | 60 | void Set(Double_t xyz[3],Double_t pxpypz[3],Double_t cv[21],Short_t sign); |
ed5f2849 | 61 | |
62 | static void SetMostProbablePt(Double_t pt) { fgMostProbablePt=pt; } | |
63 | static Double_t GetMostProbablePt() { return fgMostProbablePt; } | |
64 | ||
c9ec41e8 | 65 | void Reset(); |
ed5f2849 | 66 | void ResetCovariance(Double_t s2); |
3775b0ca | 67 | void AddCovariance(const Double_t cov[15]); |
c9ec41e8 | 68 | |
49d13e89 | 69 | const Double_t *GetParameter() const {return fP;} |
70 | const Double_t *GetCovariance() const {return fC;} | |
6c94f330 | 71 | |
72 | Double_t GetAlpha() const {return fAlpha;} | |
c7bafca9 | 73 | Double_t GetX() const {return fX;} |
2d57349e | 74 | Double_t GetY() const {return fP[0];} |
75 | Double_t GetZ() const {return fP[1];} | |
6c94f330 | 76 | Double_t GetSnp() const {return fP[2];} |
77 | Double_t GetTgl() const {return fP[3];} | |
def9660e | 78 | Double_t GetSigned1Pt() const {return fP[4];} |
6c94f330 | 79 | |
80 | Double_t GetSigmaY2() const {return fC[0];} | |
81 | Double_t GetSigmaZY() const {return fC[1];} | |
82 | Double_t GetSigmaZ2() const {return fC[2];} | |
83 | Double_t GetSigmaSnpY() const {return fC[3];} | |
84 | Double_t GetSigmaSnpZ() const {return fC[4];} | |
85 | Double_t GetSigmaSnp2() const {return fC[5];} | |
86 | Double_t GetSigmaTglY() const {return fC[6];} | |
87 | Double_t GetSigmaTglZ() const {return fC[7];} | |
88 | Double_t GetSigmaTglSnp() const {return fC[8];} | |
89 | Double_t GetSigmaTgl2() const {return fC[9];} | |
90 | Double_t GetSigma1PtY() const {return fC[10];} | |
91 | Double_t GetSigma1PtZ() const {return fC[11];} | |
92 | Double_t GetSigma1PtSnp() const {return fC[12];} | |
93 | Double_t GetSigma1PtTgl() const {return fC[13];} | |
94 | Double_t GetSigma1Pt2() const {return fC[14];} | |
95 | ||
def9660e | 96 | // additional functions for AliVParticle |
97 | Double_t Px() const; | |
98 | Double_t Py() const; | |
b52b9586 | 99 | Double_t Pz() const { return Pt()*GetTgl(); } |
def9660e | 100 | Double_t Pt() const { return TMath::Abs(GetSignedPt()); } |
101 | Double_t P() const { return GetP(); } | |
c683ddc2 | 102 | Bool_t PxPyPz(Double_t p[3]) const { return GetPxPyPz(p); } |
103 | ||
104 | Double_t Xv() const; | |
105 | Double_t Yv() const; | |
be15fa9c | 106 | Double_t Zv() const {return GetZ();} |
c683ddc2 | 107 | Bool_t XvYvZv(Double_t x[3]) const { return GetXYZ(x); } |
108 | ||
def9660e | 109 | Double_t OneOverPt() const { return 1./Pt(); } |
110 | Double_t Phi() const; | |
111 | Double_t Theta() const; | |
112 | virtual Double_t E() const; | |
113 | virtual Double_t M() const; | |
114 | Double_t Eta() const; | |
115 | virtual Double_t Y() const; | |
2258e165 | 116 | virtual Short_t Charge() const { return (Short_t)GetSign(); } |
67be2d29 | 117 | virtual const Double_t *PID() const { return 0x0; } |
def9660e | 118 | |
4f6e22bd | 119 | // additional functions from AliVTrack |
120 | virtual Int_t GetID() const { return -999; } | |
121 | virtual UChar_t GetITSClusterMap() const {return 0; } | |
122 | virtual ULong_t GetStatus() const { return 0; } | |
123 | ||
c9ec41e8 | 124 | Double_t GetSign() const {return (fP[4]>0) ? 1 : -1;} |
125 | Double_t GetP() const; | |
def9660e | 126 | Double_t GetSignedPt() const { |
6c94f330 | 127 | return (TMath::Abs(fP[4])>kAlmost0) ? 1./fP[4]:TMath::Sign(kVeryBig,fP[4]); |
128 | } | |
1d99986f | 129 | Double_t Get1P() const; |
2258e165 | 130 | virtual Double_t GetC(Double_t b) const {return fP[4]*b*kB2C;} |
1530f89c | 131 | void GetDZ(Double_t x,Double_t y,Double_t z,Double_t b,Float_t dz[2]) const; |
c7bafca9 | 132 | Double_t GetD(Double_t xv, Double_t yv, Double_t b) const; |
49d13e89 | 133 | Double_t GetLinearD(Double_t xv, Double_t yv) const; |
116b445b | 134 | Bool_t CorrectForMeanMaterial(Double_t xOverX0, Double_t xTimesRho, |
7dded1d5 | 135 | Double_t mass, Bool_t anglecorr=kFALSE, |
d46683db | 136 | Double_t (*f)(Double_t)=AliExternalTrackParam::BetheBlochSolid); |
137 | ||
9c56b409 | 138 | // |
139 | // Bethe-Bloch formula parameterizations | |
140 | // | |
141 | static Double_t BetheBlochAleph(Double_t bg, | |
142 | Double_t kp1=0.76176e-1, | |
143 | Double_t kp2=10.632, | |
144 | Double_t kp3=0.13279e-4, | |
145 | Double_t kp4=1.8631, | |
146 | Double_t kp5=1.9479 | |
147 | ); | |
148 | static Double_t BetheBlochGeant(Double_t bg, | |
149 | Double_t kp0=2.33, | |
150 | Double_t kp1=0.20, | |
151 | Double_t kp2=3.00, | |
152 | Double_t kp3=173e-9, | |
153 | Double_t kp4=0.49848 | |
154 | ); | |
155 | ||
d46683db | 156 | static Double_t BetheBlochSolid(Double_t bg); |
157 | static Double_t BetheBlochGas(Double_t bg); | |
158 | ||
49d13e89 | 159 | Double_t GetPredictedChi2(Double_t p[2],Double_t cov[3]) const; |
1e023a36 | 160 | |
4b189f98 | 161 | Double_t |
162 | GetPredictedChi2(Double_t p[3],Double_t covyz[3],Double_t covxyz[3]) const; | |
acdfbc78 | 163 | |
164 | Double_t GetPredictedChi2(const AliExternalTrackParam *t) const; | |
165 | ||
1e023a36 | 166 | Bool_t |
167 | PropagateTo(Double_t p[3],Double_t covyz[3],Double_t covxyz[3],Double_t b); | |
168 | ||
e23a38cb | 169 | Double_t *GetResiduals(Double_t *p,Double_t *cov,Bool_t updated=kTRUE) const; |
49d13e89 | 170 | Bool_t Update(Double_t p[2],Double_t cov[3]); |
171 | Bool_t Rotate(Double_t alpha); | |
172 | Bool_t PropagateTo(Double_t x, Double_t b); | |
9f2bec63 | 173 | Bool_t Propagate(Double_t alpha, Double_t x, Double_t b); |
266a0f9b | 174 | Bool_t PropagateBxByBz(Double_t alpha, Double_t x, Double_t b[3]); |
052daaff | 175 | void Propagate(Double_t len,Double_t x[3],Double_t p[3],Double_t bz) const; |
176 | Bool_t Intersect(Double_t pnt[3], Double_t norm[3], Double_t bz) const; | |
49d13e89 | 177 | |
8b6e3369 | 178 | static void g3helx3(Double_t qfield, Double_t step, Double_t vect[7]); |
179 | Bool_t PropagateToBxByBz(Double_t x, const Double_t b[3]); | |
180 | ||
c7bafca9 | 181 | void GetHelixParameters(Double_t h[6], Double_t b) const; |
182 | Double_t GetDCA(const AliExternalTrackParam *p, Double_t b, | |
183 | Double_t &xthis,Double_t &xp) const; | |
184 | Double_t PropagateToDCA(AliExternalTrackParam *p, Double_t b); | |
58e536c5 | 185 | Bool_t PropagateToDCA(const AliVVertex *vtx, Double_t b, Double_t maxd, |
e99a34df | 186 | Double_t dz[2]=0, Double_t cov[3]=0); |
266a0f9b | 187 | Bool_t PropagateToDCABxByBz(const AliVVertex *vtx, Double_t b[3], |
188 | Double_t maxd, Double_t dz[2]=0, Double_t cov[3]=0); | |
e99a34df | 189 | |
b1149664 | 190 | void GetDirection(Double_t d[3]) const; |
c9ec41e8 | 191 | Bool_t GetPxPyPz(Double_t *p) const; |
192 | Bool_t GetXYZ(Double_t *p) const; | |
193 | Bool_t GetCovarianceXYZPxPyPz(Double_t cv[21]) const; | |
194 | Bool_t GetPxPyPzAt(Double_t x, Double_t b, Double_t p[3]) const; | |
195 | Bool_t GetXYZAt(Double_t x, Double_t b, Double_t r[3]) const; | |
7cf7bb6c | 196 | Bool_t GetYAt(Double_t x, Double_t b, Double_t &y) const; |
6c94f330 | 197 | Bool_t GetZAt(Double_t x, Double_t b, Double_t &z) const; |
c9ec41e8 | 198 | void Print(Option_t* option = "") const; |
c194ba83 | 199 | Double_t GetSnpAt(Double_t x,Double_t b) const; |
6c94f330 | 200 | |
116b445b | 201 | //Deprecated |
202 | Bool_t CorrectForMaterial(Double_t d, Double_t x0, Double_t mass, | |
d46683db | 203 | Double_t (*f)(Double_t)=AliExternalTrackParam::BetheBlochSolid); |
116b445b | 204 | |
bf00ebb8 | 205 | Bool_t GetDistance(AliExternalTrackParam *param2, Double_t x, Double_t dist[3], Double_t b); |
0e8460af | 206 | Int_t GetIndex(Int_t i, Int_t j) const; |
3c43fb2b | 207 | Int_t GetLabel() const {return -1;} |
0c19adf7 | 208 | // |
209 | // visualization (M. Ivanov) | |
210 | // | |
211 | virtual void FillPolymarker(TPolyMarker3D *pol, Float_t magf, Float_t minR, Float_t maxR, Float_t stepR); | |
212 | virtual void DrawTrack(Float_t magF, Float_t minR, Float_t maxR, Float_t stepR); | |
cfdb62d4 | 213 | |
214 | virtual Bool_t Translate(Double_t *vTrasl,Double_t *covV); | |
215 | ||
86be8934 | 216 | void CheckCovariance(); |
217 | ||
218 | /* protected: */ | |
219 | private: | |
6c94f330 | 220 | Double_t &Par(Int_t i) {return fP[i];} |
221 | Double_t &Cov(Int_t i) {return fC[i];} | |
0c19adf7 | 222 | |
223 | private: | |
bad5ac2c | 224 | Double32_t fX; // X coordinate for the point of parametrisation |
225 | Double32_t fAlpha; // Local <-->global coor.system rotation angle | |
226 | Double32_t fP[5]; // The track parameters | |
227 | Double32_t fC[15]; // The track parameter covariance matrix | |
c9ec41e8 | 228 | |
ed5f2849 | 229 | static Double32_t fgMostProbablePt; // "Most probable" pt |
230 | // (to be used if Bz=0) | |
4f6e22bd | 231 | ClassDef(AliExternalTrackParam, 8) |
51ad6848 | 232 | }; |
233 | ||
ed5f2849 | 234 | inline void AliExternalTrackParam::ResetCovariance(Double_t s2) { |
235 | // | |
236 | // Reset the covarince matrix to "something big" | |
237 | // | |
86be8934 | 238 | |
239 | s2 = TMath::Abs(s2); | |
240 | Double_t fC0=fC[0]*s2, | |
241 | fC2=fC[2]*s2, | |
242 | fC5=fC[5]*s2, | |
243 | fC9=fC[9]*s2, | |
244 | fC14=fC[14]*s2; | |
245 | ||
246 | if (fC0>kC0max) fC0 = kC0max; | |
247 | if (fC2>kC2max) fC2 = kC2max; | |
248 | if (fC5>kC5max) fC5 = kC5max; | |
249 | if (fC9>kC9max) fC9 = kC9max; | |
250 | if (fC14>kC14max) fC14 = kC14max; | |
251 | ||
252 | ||
253 | fC[0] = fC0; | |
254 | fC[1] = 0.; fC[2] = fC2; | |
255 | fC[3] = 0.; fC[4] = 0.; fC[5] = fC5; | |
256 | fC[6] = 0.; fC[7] = 0.; fC[8] = 0.; fC[9] = fC9; | |
257 | fC[10]= 0.; fC[11]= 0.; fC[12]= 0.; fC[13]= 0.; fC[14] = fC14; | |
ed5f2849 | 258 | } |
259 | ||
bf00ebb8 | 260 | |
261 | ||
262 | ||
51ad6848 | 263 | #endif |