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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 | *****************************************************************************/ | |
a5e407e9 | 21 | #include "TObject.h" |
a5e407e9 | 22 | |
49d13e89 | 23 | const Double_t kAlmost1=0.999; |
24 | const Double_t kAlmost0=1e-33; | |
25 | const Double_t kVeryBig=1./kAlmost0; | |
26 | ||
5773defd | 27 | const Double_t kB2C=0.299792458e-3; |
28 | const Double_t kAlmost0Field=1.e-13; | |
29 | const Double_t kVeryBigConvConst=1/kB2C/kAlmost0Field; | |
30 | const Double_t kMostProbableMomentum=0.35; | |
31 | ||
51ad6848 | 32 | class AliKalmanTrack; |
edc97986 | 33 | class AliStrLine; |
f76701bf | 34 | class AliESDVertex; |
51ad6848 | 35 | |
a5e407e9 | 36 | class AliExternalTrackParam: public TObject { |
51ad6848 | 37 | public: |
38 | AliExternalTrackParam(); | |
39 | AliExternalTrackParam(Double_t x, Double_t alpha, | |
40 | const Double_t param[5], const Double_t covar[15]); | |
41 | AliExternalTrackParam(const AliKalmanTrack& track); | |
ac3eaff4 | 42 | |
c9ec41e8 | 43 | void Reset(); |
44 | void Set(const AliKalmanTrack& track); | |
45 | ||
49d13e89 | 46 | const Double_t *GetParameter() const {return fP;} |
47 | const Double_t *GetCovariance() const {return fC;} | |
c7bafca9 | 48 | Double_t GetSigmaY2() const {return fC[0];} |
49 | Double_t GetSigmaZ2() const {return fC[2];} | |
50 | Double_t GetX() const {return fX;} | |
2d57349e | 51 | Double_t GetY() const {return fP[0];} |
52 | Double_t GetZ() const {return fP[1];} | |
c7bafca9 | 53 | Double_t GetAlpha() const {return fAlpha;} |
c9ec41e8 | 54 | Double_t GetSign() const {return (fP[4]>0) ? 1 : -1;} |
55 | Double_t GetP() const; | |
1d99986f | 56 | Double_t Get1P() const; |
c7bafca9 | 57 | Double_t GetD(Double_t xv, Double_t yv, Double_t b) const; |
49d13e89 | 58 | Double_t GetLinearD(Double_t xv, Double_t yv) const; |
c7bafca9 | 59 | Bool_t CorrectForMaterial(Double_t d, Double_t x0, Double_t mass); |
49d13e89 | 60 | Double_t GetPredictedChi2(Double_t p[2],Double_t cov[3]) const; |
61 | Bool_t Update(Double_t p[2],Double_t cov[3]); | |
62 | Bool_t Rotate(Double_t alpha); | |
63 | Bool_t PropagateTo(Double_t x, Double_t b); | |
64 | Bool_t Propagate(Double_t alpha, Double_t x, Double_t b) { | |
65 | if (Rotate(alpha)) | |
66 | if (PropagateTo(x,b)) return kTRUE; | |
67 | return kFALSE; | |
68 | } | |
69 | ||
c7bafca9 | 70 | void GetHelixParameters(Double_t h[6], Double_t b) const; |
71 | Double_t GetDCA(const AliExternalTrackParam *p, Double_t b, | |
72 | Double_t &xthis,Double_t &xp) const; | |
73 | Double_t PropagateToDCA(AliExternalTrackParam *p, Double_t b); | |
f76701bf | 74 | Bool_t PropagateToDCA(const AliESDVertex *vtx, Double_t b, Double_t maxd); |
c7bafca9 | 75 | |
c9ec41e8 | 76 | Bool_t GetPxPyPz(Double_t *p) const; |
77 | Bool_t GetXYZ(Double_t *p) const; | |
78 | Bool_t GetCovarianceXYZPxPyPz(Double_t cv[21]) const; | |
79 | Bool_t GetPxPyPzAt(Double_t x, Double_t b, Double_t p[3]) const; | |
80 | Bool_t GetXYZAt(Double_t x, Double_t b, Double_t r[3]) const; | |
edc97986 | 81 | void ApproximateHelixWithLine(Double_t xk, Double_t b, AliStrLine *line); |
c9ec41e8 | 82 | void Print(Option_t* option = "") const; |
5b77d93c | 83 | // MI |
84 | virtual Bool_t CorrectForMaterial(Double_t d, Double_t x0, Double_t rho, Double_t mass); | |
85 | virtual Bool_t PropagateTo(Double_t x, Double_t mass, Double_t maxStep, Bool_t rotateTo=kTRUE); | |
c9ec41e8 | 86 | |
87 | private: | |
49d13e89 | 88 | Double_t fX; // X coordinate for the point of parametrisation |
89 | Double_t fAlpha; // Local <-->global coor.system rotation angle | |
90 | Double_t fP[5]; // The track parameters | |
91 | Double_t fC[15]; // The track parameter covariance matrix | |
c9ec41e8 | 92 | |
93 | ClassDef(AliExternalTrackParam, 4) | |
51ad6848 | 94 | }; |
95 | ||
96 | #endif |