//////////////////////////////////////////////////////////////
#include <TObject.h>
+#include <TMatrixD.h>
class AliMagF;
class AliMUONTrackParam;
/// Destructor
virtual ~AliMUONTrackExtrap(){};
- /// set field map
- static void SetField(const AliMagF* magField) {fgkField = magField;}
+ static void SetField();
- static void ExtrapToZ(AliMUONTrackParam *trackParam, Double_t Z);
- static void ExtrapToStation(AliMUONTrackParam *trackParamIn, Int_t station, AliMUONTrackParam *trackParamOut);
- static void ExtrapToVertex(AliMUONTrackParam *trackParam, Double_t xVtx, Double_t yVtx, Double_t zVtx);
+ /// return kTRUE if the field is switched ON
+ static Bool_t IsFieldON() {return fgFieldON;}
+
+ static Double_t GetImpactParamFromBendingMomentum(Double_t bendingMomentum);
+ static Double_t GetBendingMomentumFromImpactParam(Double_t impactParam);
+
+ // Linearly extrapolate track parameters
+ static void LinearExtrapToZ(AliMUONTrackParam* trackParam, Double_t zEnd);
+
+ // Linearly extrapolate track parameters and covariances
+ static void LinearExtrapToZCov(AliMUONTrackParam* trackParam, Double_t zEnd, Bool_t updatePropagator = kFALSE);
+
+ // Extrapolate track parameters in magnetic field
+ static Bool_t ExtrapToZ(AliMUONTrackParam *trackParam, Double_t zEnd);
+
+ // Extrapolate track parameters and covariances in magnetic field
+ static Bool_t ExtrapToZCov(AliMUONTrackParam* trackParam, Double_t zEnd, Bool_t updatePropagator = kFALSE);
+
+ // Extrapolate track parameters to vertex, corrected for multiple scattering and energy loss effects
+ // Add branson correction resolution and energy loss fluctuation to parameter covariances
+ static void ExtrapToVertex(AliMUONTrackParam* trackParam,
+ Double_t xVtx, Double_t yVtx, Double_t zVtx,
+ Double_t errXVtx, Double_t errYVtx);
+
+ // Extrapolate track parameters to vertex, corrected for multiple scattering effects only
+ // Add branson correction resolution to parameter covariances
+ static void ExtrapToVertexWithoutELoss(AliMUONTrackParam* trackParam,
+ Double_t xVtx, Double_t yVtx, Double_t zVtx,
+ Double_t errXVtx, Double_t errYVtx);
+
+ // Extrapolate track parameters to vertex, corrected for energy loss effects only
+ // Add dispersion due to multiple scattering and energy loss fluctuation to parameter covariances
+ static void ExtrapToVertexWithoutBranson(AliMUONTrackParam* trackParam, Double_t zVtx);
+
+ // Extrapolate track parameters to vertex without multiple scattering and energy loss corrections
+ // Add dispersion due to multiple scattering to parameter covariances
+ static void ExtrapToVertexUncorrected(AliMUONTrackParam* trackParam, Double_t zVtx);
+
+ static Double_t TotalMomentumEnergyLoss(AliMUONTrackParam* trackParam, Double_t xVtx, Double_t yVtx, Double_t zVtx);
+
+ static Double_t GetMCSAngle2(const AliMUONTrackParam& param, Double_t dZ, Double_t x0);
+ static void AddMCSEffect(AliMUONTrackParam *param, Double_t dZ, Double_t x0);
static void ExtrapOneStepRungekutta(Double_t charge, Double_t step, Double_t* vect, Double_t* vout);
private:
- static const AliMagF* fgkField; //!< field map
-
+ static const Double_t fgkSimpleBPosition; //!< position of the dipole
+ static const Double_t fgkSimpleBLength; //!< length of the dipole
+ static Double_t fgSimpleBValue; //!< magnetic field value at the centre
+ static Bool_t fgFieldON; //!< kTRUE if the field is switched ON
+ static const Bool_t fgkUseHelix; //!< Tell whether to use Helix or not (default is Runge-Kutta)
+ static const Int_t fgkMaxStepNumber; //!< Maximum number of steps for track extrapolation
+ static const Double_t fgkHelixStepLength; //!< Step lenght for track extrapolation (used in Helix)
+ static const Double_t fgkRungeKuttaMaxResidue;//!< Maximal distance (in Z) to destination to stop the track extrapolation (used in Runge-Kutta)
+
// Functions
+
+ /// Not implemented
AliMUONTrackExtrap(const AliMUONTrackExtrap& trackExtrap);
+ /// Not implemented
AliMUONTrackExtrap& operator=(const AliMUONTrackExtrap& trackExtrap);
- static void SetGeant3ParametersFromTrackParam(AliMUONTrackParam* trackParam, Double_t *vGeant3, Double_t forwardBackward);
- static void SetTrackParamFromGeant3Parameters(Double_t *vGeant3, Double_t Charge, AliMUONTrackParam* trackParam);
+ static Bool_t ExtrapToZHelix(AliMUONTrackParam *trackParam, Double_t Z);
+ static Bool_t ExtrapToZRungekutta(AliMUONTrackParam *trackParam, Double_t Z);
+
+ static void ConvertTrackParamForExtrap(AliMUONTrackParam* trackParam, Double_t forwardBackward, Double_t *v3);
+ static void RecoverTrackParam(Double_t *v3, Double_t Charge, AliMUONTrackParam* trackParam);
- static void BransonCorrection(AliMUONTrackParam *trackParam, Double_t xVtx, Double_t yVtx, Double_t zVtx);
- static Double_t TotalMomentumEnergyLoss(Double_t thetaLimit, Double_t pTotal, Double_t theta);
- static void FieldCorrection(AliMUONTrackParam *trackParam, Double_t Z);
+ static void ExtrapToVertex(AliMUONTrackParam* trackParam,
+ Double_t xVtx, Double_t yVtx, Double_t zVtx,
+ Double_t errXVtx, Double_t errYVtx,
+ Bool_t correctForMCS, Bool_t correctForEnergyLoss);
+
+ static void AddMCSEffectInAbsorber(AliMUONTrackParam* trackParam, Double_t signedPathLength, Double_t f0, Double_t f1, Double_t f2);
+ static void CorrectMCSEffectInAbsorber(AliMUONTrackParam* param,
+ Double_t xVtx, Double_t yVtx, Double_t zVtx,
+ Double_t errXVtx, Double_t errYVtx,
+ Double_t absZBeg, Double_t pathLength, Double_t f0, Double_t f1, Double_t f2);
+ static void CorrectELossEffectInAbsorber(AliMUONTrackParam* param, Double_t eLoss, Double_t sigmaELoss2);
+ static Bool_t GetAbsorberCorrectionParam(Double_t trackXYZIn[3], Double_t trackXYZOut[3], Double_t pTotal,
+ Double_t &pathLength, Double_t &f0, Double_t &f1, Double_t &f2,
+ Double_t &meanRho, Double_t &totalELoss, Double_t &sigmaELoss2);
+
+ static Double_t BetheBloch(Double_t pTotal, Double_t pathLength, Double_t rho, Double_t atomicZ, Double_t atomicZoverA);
+ static Double_t EnergyLossFluctuation2(Double_t pTotal, Double_t pathLength, Double_t rho, Double_t atomicZoverA);
+
+ static void Cov2CovP(const TMatrixD ¶m, TMatrixD &cov);
+ static void CovP2Cov(const TMatrixD ¶m, TMatrixD &cov);
static void ExtrapOneStepHelix(Double_t charge, Double_t step, Double_t *vect, Double_t *vout);
static void ExtrapOneStepHelix3(Double_t field, Double_t step, Double_t *vect, Double_t *vout);
-
- static void GetField(Double_t *Position, Double_t *Field);
ClassDef(AliMUONTrackExtrap, 0) // Tools for track extrapolation in ALICE dimuon spectrometer
};
git://git.uio.no / u / mrichter / AliRoot.git / blobdiff