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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> | |
18 | ||
19 | class AliMagF; | |
20 | class AliMUONTrackParam; | |
21 | ||
22 | class AliMUONTrackExtrap : public TObject | |
23 | { | |
24 | public: | |
25 | /// Constructor | |
26 | AliMUONTrackExtrap() : TObject(){}; | |
27 | /// Destructor | |
28 | virtual ~AliMUONTrackExtrap(){}; | |
29 | ||
30 | /// set field map | |
31 | static void SetField(const AliMagF* magField) {fgkField = magField;} | |
32 | ||
208f139e | 33 | static Double_t GetImpactParamFromBendingMomentum(Double_t bendingMomentum); |
34 | static Double_t GetBendingMomentumFromImpactParam(Double_t impactParam); | |
35 | ||
c04e3238 | 36 | static void ExtrapToZ(AliMUONTrackParam *trackParam, Double_t Z); |
208f139e | 37 | static void ExtrapToZCov(AliMUONTrackParam* trackParam, Double_t zEnd); |
c04e3238 | 38 | static void ExtrapToStation(AliMUONTrackParam *trackParamIn, Int_t station, AliMUONTrackParam *trackParamOut); |
208f139e | 39 | static void ExtrapToVertexUncorrected(AliMUONTrackParam* trackParam, Double_t zVtx); |
c04e3238 | 40 | static void ExtrapToVertex(AliMUONTrackParam *trackParam, Double_t xVtx, Double_t yVtx, Double_t zVtx); |
41 | ||
8cde4af5 | 42 | static void AddMCSEffect(AliMUONTrackParam *param, Double_t dZ, Double_t x0); |
208f139e | 43 | |
c04e3238 | 44 | static void ExtrapOneStepRungekutta(Double_t charge, Double_t step, Double_t* vect, Double_t* vout); |
45 | ||
46 | ||
47 | private: | |
4284483e | 48 | static const AliMagF* fgkField; //!< field map |
49 | static const Bool_t fgkUseHelix; //!< Tell whether to use Helix or not (default is Runge-Kutta) | |
50 | static const Int_t fgkMaxStepNumber; //!< Maximum number of steps for track extrapolation | |
51 | static const Double_t fgkHelixStepLength; //!< Step lenght for track extrapolation (used in Helix) | |
52 | static const Double_t fgkRungeKuttaMaxResidue;//!< Maximal distance (in Z) to destination to stop the track extrapolation (used in Runge-Kutta) | |
53 | ||
c04e3238 | 54 | // Functions |
55 | AliMUONTrackExtrap(const AliMUONTrackExtrap& trackExtrap); | |
56 | AliMUONTrackExtrap& operator=(const AliMUONTrackExtrap& trackExtrap); | |
57 | ||
4284483e | 58 | static void ExtrapToZHelix(AliMUONTrackParam *trackParam, Double_t Z); |
59 | static void ExtrapToZRungekutta(AliMUONTrackParam *trackParam, Double_t Z); | |
60 | ||
61 | static void ConvertTrackParamForExtrap(AliMUONTrackParam* trackParam, Double_t forwardBackward, Double_t *v3); | |
eb3178e9 | 62 | static void RecoverTrackParam(Double_t *v3, Double_t Charge, AliMUONTrackParam* trackParam); |
c04e3238 | 63 | |
8cde4af5 | 64 | static void AddMCSEffectInAbsorber(AliMUONTrackParam* trackParam, Double_t pathLength, Double_t f0, Double_t f1, Double_t f2); |
65 | static void GetAbsorberCorrectionParam(Double_t trackXYZIn[3], Double_t trackXYZOut[3], Double_t &pathLength, | |
66 | Double_t &f0, Double_t &f1, Double_t &f2, Double_t &meanRho); | |
67 | ||
68 | static Double_t TotalMomentumEnergyLoss(Double_t pTotal, Double_t pathLength, Double_t rho); | |
69 | static Double_t ApproximateBetheBloch(Double_t beta2); | |
c04e3238 | 70 | |
71 | static void ExtrapOneStepHelix(Double_t charge, Double_t step, Double_t *vect, Double_t *vout); | |
72 | static void ExtrapOneStepHelix3(Double_t field, Double_t step, Double_t *vect, Double_t *vout); | |
73 | ||
74 | static void GetField(Double_t *Position, Double_t *Field); | |
75 | ||
76 | ClassDef(AliMUONTrackExtrap, 0) // Tools for track extrapolation in ALICE dimuon spectrometer | |
77 | }; | |
78 | ||
79 | #endif |