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c04e3238 | 1 | #ifndef ALIMUONTRACKEXTRAP_H |
2 | #define ALIMUONTRACKEXTRAP_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 | // Revision of includes 07/05/2004 | |
8 | ||
9 | /// \ingroup rec | |
10 | /// \class AliMUONTrackExtrap | |
11 | /// \brief Track parameters in ALICE dimuon spectrometer | |
12 | /// | |
13 | ////////////////////////////////////////////////////////////// | |
14 | /// Tools for track extrapolation in ALICE dimuon spectrometer | |
15 | ////////////////////////////////////////////////////////////// | |
16 | ||
17 | #include <TObject.h> | |
690d2205 | 18 | #include <TMatrixD.h> |
c04e3238 | 19 | |
20 | class AliMagF; | |
21 | class AliMUONTrackParam; | |
22 | ||
23 | class AliMUONTrackExtrap : public TObject | |
24 | { | |
25 | public: | |
26 | /// Constructor | |
27 | AliMUONTrackExtrap() : TObject(){}; | |
28 | /// Destructor | |
29 | virtual ~AliMUONTrackExtrap(){}; | |
30 | ||
31 | /// set field map | |
32 | static void SetField(const AliMagF* magField) {fgkField = magField;} | |
33 | ||
208f139e | 34 | static Double_t GetImpactParamFromBendingMomentum(Double_t bendingMomentum); |
35 | static Double_t GetBendingMomentumFromImpactParam(Double_t impactParam); | |
36 | ||
690d2205 | 37 | // Linearly extrapolate track parameters and covariances |
019df241 | 38 | static void LinearExtrapToZ(AliMUONTrackParam* trackParam, Double_t zEnd); |
690d2205 | 39 | |
40 | // Extrapolate track parameters in magnetic field | |
019df241 | 41 | static void ExtrapToZ(AliMUONTrackParam *trackParam, Double_t zEnd); |
690d2205 | 42 | |
43 | // Extrapolate track parameters and covariances in magnetic field | |
ea94c18b | 44 | static void ExtrapToZCov(AliMUONTrackParam* trackParam, Double_t zEnd, Bool_t updatePropagator = kFALSE); |
690d2205 | 45 | |
46 | // Extrapolate track parameters to vertex, corrected for multiple scattering and energy loss effects | |
47 | // Add branson correction resolution and energy loss fluctuation to parameter covariances | |
48 | static void ExtrapToVertex(AliMUONTrackParam* trackParam, | |
49 | Double_t xVtx, Double_t yVtx, Double_t zVtx, | |
50 | Double_t errXVtx, Double_t errYVtx); | |
51 | ||
52 | // Extrapolate track parameters to vertex, corrected for multiple scattering effects only | |
53 | // Add branson correction resolution to parameter covariances | |
54 | static void ExtrapToVertexWithoutELoss(AliMUONTrackParam* trackParam, | |
55 | Double_t xVtx, Double_t yVtx, Double_t zVtx, | |
56 | Double_t errXVtx, Double_t errYVtx); | |
57 | ||
58 | // Extrapolate track parameters to vertex, corrected for energy loss effects only | |
59 | // Add dispersion due to multiple scattering and energy loss fluctuation to parameter covariances | |
60 | static void ExtrapToVertexWithoutBranson(AliMUONTrackParam* trackParam, Double_t zVtx); | |
61 | ||
62 | // Extrapolate track parameters to vertex without multiple scattering and energy loss corrections | |
63 | // Add dispersion due to multiple scattering to parameter covariances | |
208f139e | 64 | static void ExtrapToVertexUncorrected(AliMUONTrackParam* trackParam, Double_t zVtx); |
fac70e25 | 65 | |
66 | static Double_t TotalMomentumEnergyLoss(AliMUONTrackParam* trackParam, Double_t xVtx, Double_t yVtx, Double_t zVtx); | |
c04e3238 | 67 | |
ea94c18b | 68 | static Double_t GetMCSAngle2(const AliMUONTrackParam& param, Double_t dZ, Double_t x0); |
69 | static void AddMCSEffect(AliMUONTrackParam *param, Double_t dZ, Double_t x0); | |
208f139e | 70 | |
c04e3238 | 71 | static void ExtrapOneStepRungekutta(Double_t charge, Double_t step, Double_t* vect, Double_t* vout); |
72 | ||
73 | ||
74 | private: | |
4284483e | 75 | static const AliMagF* fgkField; //!< field map |
76 | static const Bool_t fgkUseHelix; //!< Tell whether to use Helix or not (default is Runge-Kutta) | |
77 | static const Int_t fgkMaxStepNumber; //!< Maximum number of steps for track extrapolation | |
78 | static const Double_t fgkHelixStepLength; //!< Step lenght for track extrapolation (used in Helix) | |
79 | static const Double_t fgkRungeKuttaMaxResidue;//!< Maximal distance (in Z) to destination to stop the track extrapolation (used in Runge-Kutta) | |
80 | ||
c04e3238 | 81 | // Functions |
71a2d3aa | 82 | |
83 | /// Not implemented | |
c04e3238 | 84 | AliMUONTrackExtrap(const AliMUONTrackExtrap& trackExtrap); |
71a2d3aa | 85 | /// Not implemented |
c04e3238 | 86 | AliMUONTrackExtrap& operator=(const AliMUONTrackExtrap& trackExtrap); |
87 | ||
4284483e | 88 | static void ExtrapToZHelix(AliMUONTrackParam *trackParam, Double_t Z); |
89 | static void ExtrapToZRungekutta(AliMUONTrackParam *trackParam, Double_t Z); | |
90 | ||
91 | static void ConvertTrackParamForExtrap(AliMUONTrackParam* trackParam, Double_t forwardBackward, Double_t *v3); | |
eb3178e9 | 92 | static void RecoverTrackParam(Double_t *v3, Double_t Charge, AliMUONTrackParam* trackParam); |
c04e3238 | 93 | |
690d2205 | 94 | static void ExtrapToVertex(AliMUONTrackParam* trackParam, |
95 | Double_t xVtx, Double_t yVtx, Double_t zVtx, | |
96 | Double_t errXVtx, Double_t errYVtx, | |
97 | Bool_t correctForMCS, Bool_t correctForEnergyLoss); | |
98 | ||
8cde4af5 | 99 | static void AddMCSEffectInAbsorber(AliMUONTrackParam* trackParam, Double_t pathLength, Double_t f0, Double_t f1, Double_t f2); |
690d2205 | 100 | static void CorrectMCSEffectInAbsorber(AliMUONTrackParam* param, |
101 | Double_t xVtx, Double_t yVtx, Double_t zVtx, | |
102 | Double_t errXVtx, Double_t errYVtx, | |
103 | Double_t absZBeg, Double_t pathLength, Double_t f0, Double_t f1, Double_t f2); | |
104 | static void CorrectELossEffectInAbsorber(AliMUONTrackParam* param, Double_t eLoss, Double_t sigmaELoss2); | |
18abc511 | 105 | static Bool_t GetAbsorberCorrectionParam(Double_t trackXYZIn[3], Double_t trackXYZOut[3], Double_t pTotal, |
106 | Double_t &pathLength, Double_t &f0, Double_t &f1, Double_t &f2, | |
107 | Double_t &meanRho, Double_t &totalELoss, Double_t &sigmaELoss2); | |
8cde4af5 | 108 | |
84f061ef | 109 | static Double_t BetheBloch(Double_t pTotal, Double_t pathLength, Double_t rho, Double_t atomicA, Double_t atomicZ); |
690d2205 | 110 | static Double_t EnergyLossFluctuation2(Double_t pTotal, Double_t pathLength, Double_t rho, Double_t atomicA, Double_t atomicZ); |
111 | ||
112 | static void Cov2CovP(const TMatrixD ¶m, TMatrixD &cov); | |
113 | static void CovP2Cov(const TMatrixD ¶m, TMatrixD &cov); | |
c04e3238 | 114 | |
115 | static void ExtrapOneStepHelix(Double_t charge, Double_t step, Double_t *vect, Double_t *vout); | |
116 | static void ExtrapOneStepHelix3(Double_t field, Double_t step, Double_t *vect, Double_t *vout); | |
117 | ||
118 | static void GetField(Double_t *Position, Double_t *Field); | |
119 | ||
120 | ClassDef(AliMUONTrackExtrap, 0) // Tools for track extrapolation in ALICE dimuon spectrometer | |
121 | }; | |
122 | ||
123 | #endif |