AliRoot Core  ee782a0 (ee782a0)
AliMFTTrackExtrap Class Reference

Track parameters in ALICE dimuon spectrometer. More...

#include <AliMFTTrackExtrap.h>

Inheritance diagram for AliMFTTrackExtrap:

Public Member Functions

 AliMFTTrackExtrap ()
 Constructor. More...
 
virtual ~AliMFTTrackExtrap ()
 Destructor. More...
 

Static Public Member Functions

static void SetField ()
 
static Bool_t IsFieldON ()
 return kTRUE if the field is switched ON More...
 
static Double_t GetImpactParamFromBendingMomentum (Double_t bendingMomentum)
 
static Double_t GetBendingMomentumFromImpactParam (Double_t impactParam)
 
static void LinearExtrapToZ (AliMFTTrackParam *trackParam, Double_t zEnd)
 
static void LinearExtrapToZCov (AliMFTTrackParam *trackParam, Double_t zEnd, Bool_t updatePropagator=kFALSE)
 
static Bool_t ExtrapToZ (AliMFTTrackParam *trackParam, Double_t zEnd)
 
static Bool_t ExtrapToZCov (AliMFTTrackParam *trackParam, Double_t zEnd, Bool_t updatePropagator=kFALSE)
 
static void ExtrapToVertex (AliMFTTrackParam *trackParam, Double_t xVtx, Double_t yVtx, Double_t zVtx, Double_t errXVtx, Double_t errYVtx)
 
static void ExtrapToVertexWithoutELoss (AliMFTTrackParam *trackParam, Double_t xVtx, Double_t yVtx, Double_t zVtx, Double_t errXVtx, Double_t errYVtx)
 
static void ExtrapToVertexWithoutBranson (AliMFTTrackParam *trackParam, Double_t zVtx)
 
static void ExtrapToVertexUncorrected (AliMFTTrackParam *trackParam, Double_t zVtx)
 
static Double_t TotalMomentumEnergyLoss (AliMFTTrackParam *trackParam, Double_t xVtx, Double_t yVtx, Double_t zVtx)
 
static Double_t GetMCSAngle2 (const AliMFTTrackParam &param, Double_t dZ, Double_t x0)
 
static void AddMCSEffect (AliMFTTrackParam *param, Double_t dZ, Double_t x0)
 
static Bool_t ExtrapOneStepRungekutta (Double_t charge, Double_t step, const Double_t *vect, Double_t *vout)
 
static Double_t LinearRegression (Int_t nVal, Double_t *xVal, Double_t *yVal, Double_t &p0, Double_t &p1)
 
static Double_t Sagitta (Int_t nVal, Double_t *xVal, Double_t *yVal, Double_t &distL, Double_t &q2)
 
static Double_t QuadraticRegression (Int_t nVal, Double_t *xVal, Double_t *yVal, Double_t &p0, Double_t &p1, Double_t &p2)
 
static Double_t CircleRegression (Int_t nVal, Double_t *xVal, Double_t *yVal)
 

Private Member Functions

 AliMFTTrackExtrap (const AliMFTTrackExtrap &trackExtrap)
 Not implemented. More...
 
AliMFTTrackExtrapoperator= (const AliMFTTrackExtrap &trackExtrap)
 Not implemented. More...
 

Static Private Member Functions

static Bool_t ExtrapToZHelix (AliMFTTrackParam *trackParam, Double_t Z)
 
static Bool_t ExtrapToZRungekutta (AliMFTTrackParam *trackParam, Double_t Z)
 
static void ConvertTrackParamForExtrap (AliMFTTrackParam *trackParam, Double_t forwardBackward, Double_t *v3)
 
static void RecoverTrackParam (Double_t *v3, Double_t Charge, AliMFTTrackParam *trackParam)
 
static void ExtrapToVertex (AliMFTTrackParam *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 (AliMFTTrackParam *trackParam, Double_t signedPathLength, Double_t f0, Double_t f1, Double_t f2)
 
static void CorrectMCSEffectInAbsorber (AliMFTTrackParam *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 (AliMFTTrackParam *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 EnergyLossFluctuation (Double_t pTotal, Double_t pathLength, Double_t rho, Double_t atomicZoverA)
 
static void Cov2CovP (const TMatrixD &param, TMatrixD &cov)
 
static void CovP2Cov (const TMatrixD &param, TMatrixD &cov)
 
static void ExtrapOneStepHelix (Double_t charge, Double_t step, const Double_t *vect, Double_t *vout)
 
static void ExtrapOneStepHelix3 (Double_t field, Double_t step, const Double_t *vect, Double_t *vout)
 

Static Private Attributes

static const Double_t fgkSimpleBPosition = 0.5 * (AliMFTConstants::DefaultPlaneZ(0) + AliMFTConstants::DefaultPlaneZ(9))
 ! position of the dipole More...
 
static const Double_t fgkSimpleBLength
 ! length of the dipole More...
 
static Double_t fgSimpleBValue = 0.
 ! magnetic field value at the centre More...
 
static Bool_t fgFieldON = kFALSE
 ! kTRUE if the field is switched ON More...
 
static const Bool_t fgkUseHelix = kTRUE
 ! Tell whether to use Helix or not (default is Runge-Kutta) More...
 
static const Int_t fgkMaxStepNumber = 5000
 ! Maximum number of steps for track extrapolation More...
 
static const Double_t fgkHelixStepLength = 0.1
 ! Step lenght for track extrapolation (used in Helix) More...
 
static const Double_t fgkRungeKuttaMaxResidue = 0.002
 ! Maximal distance (in Z) to destination to stop the track extrapolation (used in Runge-Kutta) More...
 

Detailed Description

Track parameters in ALICE dimuon spectrometer.

Tools for track extrapolation in ALICE dimuon spectrometer

Definition at line 23 of file AliMFTTrackExtrap.h.

Constructor & Destructor Documentation

AliMFTTrackExtrap::AliMFTTrackExtrap ( )
inline

Constructor.

Definition at line 27 of file AliMFTTrackExtrap.h.

virtual AliMFTTrackExtrap::~AliMFTTrackExtrap ( )
inlinevirtual

Destructor.

Definition at line 29 of file AliMFTTrackExtrap.h.

AliMFTTrackExtrap::AliMFTTrackExtrap ( const AliMFTTrackExtrap trackExtrap)
private

Not implemented.

Member Function Documentation

void AliMFTTrackExtrap::AddMCSEffect ( AliMFTTrackParam param,
Double_t  dZ,
Double_t  x0 
)
static

Add to the track parameter covariances the effects of multiple Coulomb scattering through a material of thickness "Abs(dZ)" and of radiation length "x0" assuming linear propagation and using the small angle approximation. dZ = zOut - zIn (sign is important) and "param" is assumed to be given zOut. If x0 <= 0., assume dZ = pathLength/x0 and consider the material thickness as negligible.

Definition at line 998 of file AliMFTTrackExtrap.cxx.

Referenced by AliMFTTrackReconstructor::AddMCSEffect(), and IsFieldON().

void AliMFTTrackExtrap::AddMCSEffectInAbsorber ( AliMFTTrackParam trackParam,
Double_t  signedPathLength,
Double_t  f0,
Double_t  f1,
Double_t  f2 
)
staticprivate

Add to the track parameter covariances the effects of multiple Coulomb scattering signedPathLength must have the sign of (zOut - zIn) where all other parameters are assumed to be given at zOut.

Definition at line 707 of file AliMFTTrackExtrap.cxx.

Double_t AliMFTTrackExtrap::BetheBloch ( Double_t  pTotal,
Double_t  pathLength,
Double_t  rho,
Double_t  atomicZ,
Double_t  atomicZoverA 
)
staticprivate

Returns the mean total momentum energy loss of muon with total momentum='pTotal' in the absorber layer of lenght='pathLength', density='rho', A='atomicA' and Z='atomicZ'

Definition at line 1250 of file AliMFTTrackExtrap.cxx.

Referenced by GetAbsorberCorrectionParam().

Double_t AliMFTTrackExtrap::CircleRegression ( Int_t  nVal,
Double_t *  xVal,
Double_t *  yVal 
)
static

Perform a Circular Regression Assume same error on all clusters = 1 Return Radius evaluation

Definition at line 297 of file AliMFTTrackExtrap.cxx.

Referenced by IsFieldON().

void AliMFTTrackExtrap::ConvertTrackParamForExtrap ( AliMFTTrackParam trackParam,
Double_t  forwardBackward,
Double_t *  v3 
)
staticprivate

Set vector of Geant3 parameters pointed to by "v3" from track parameters in trackParam. Since AliMFTTrackParam is only geometry, one uses "forwardBackward" to know whether the particle is going forward (+1) or backward (-1).

Definition at line 565 of file AliMFTTrackExtrap.cxx.

Referenced by ExtrapToZHelix(), and ExtrapToZRungekutta().

void AliMFTTrackExtrap::CorrectELossEffectInAbsorber ( AliMFTTrackParam param,
Double_t  eLoss,
Double_t  sigmaELoss2 
)
staticprivate

Correct parameters for energy loss and add energy loss fluctuation effect to covariances

Definition at line 822 of file AliMFTTrackExtrap.cxx.

void AliMFTTrackExtrap::CorrectMCSEffectInAbsorber ( AliMFTTrackParam 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 
)
staticprivate

Definition at line 751 of file AliMFTTrackExtrap.cxx.

void AliMFTTrackExtrap::Cov2CovP ( const TMatrixD param,
TMatrixD cov 
)
staticprivate

change coordinate system: (X, SlopeX, Y, SlopeY, q/Pyz) -> (X, SlopeX, Y, SlopeY, q*PTot) parameters (param) are given in the (X, SlopeX, Y, SlopeY, q/Pyz) coordinate system

Definition at line 1284 of file AliMFTTrackExtrap.cxx.

void AliMFTTrackExtrap::CovP2Cov ( const TMatrixD param,
TMatrixD cov 
)
staticprivate

change coordinate system: (X, SlopeX, Y, SlopeY, q*PTot) -> (X, SlopeX, Y, SlopeY, q/Pyz) parameters (param) are given in the (X, SlopeX, Y, SlopeY, q/Pyz) coordinate system

Definition at line 1307 of file AliMFTTrackExtrap.cxx.

Double_t AliMFTTrackExtrap::EnergyLossFluctuation ( Double_t  pTotal,
Double_t  pathLength,
Double_t  rho,
Double_t  atomicZoverA 
)
staticprivate

Returns the total momentum energy loss fluctuation of muon with total momentum='pTotal' in the absorber layer of lenght='pathLength', density='rho', A='atomicA' and Z='atomicZ'

Definition at line 1265 of file AliMFTTrackExtrap.cxx.

Referenced by GetAbsorberCorrectionParam().

void AliMFTTrackExtrap::ExtrapOneStepHelix ( Double_t  charge,
Double_t  step,
const Double_t *  vect,
Double_t *  vout 
)
staticprivate
   ******************************************************************
   *                                                                *
   *  Performs the tracking of one step in a magnetic field         *
   *  The trajectory is assumed to be a helix in a constant field   *
   *  taken at the mid point of the step.                           *
   *  Parameters:                                                   *
   *   input                                                        *
   *     STEP =arc length of the step asked                         *
   *     VECT =input vector (position,direction cos and momentum)   *
   *     CHARGE=  electric charge of the particle                   *
   *   output                                                       *
   *     VOUT = same as VECT after completion of the step           *
   *                                                                *
   *    ==>Called by : USER, GUSWIM                               *
   *       Author    m.hansroul  *********                          *
   *       modified  s.egli, s.v.levonian                           *
   *       modified  v.perevoztchikov
   *                                                                *
   ******************************************************************

Definition at line 1330 of file AliMFTTrackExtrap.cxx.

Referenced by ExtrapToZHelix().

void AliMFTTrackExtrap::ExtrapOneStepHelix3 ( Double_t  field,
Double_t  step,
const Double_t *  vect,
Double_t *  vout 
)
staticprivate
******************************************************************
*                *
* Tracking routine in a constant field oriented    *
* along axis 3             *
* Tracking is performed with a conventional    *
* helix step method          *
*                *
*    ==>Called by : USER, GUSWIM         *
* Authors    R.Brun, M.Hansroul  *********     *
* Rewritten  V.Perevoztchikov
*                *
******************************************************************

Definition at line 1453 of file AliMFTTrackExtrap.cxx.

Referenced by ExtrapOneStepHelix().

Bool_t AliMFTTrackExtrap::ExtrapOneStepRungekutta ( Double_t  charge,
Double_t  step,
const Double_t *  vect,
Double_t *  vout 
)
static
******************************************************************
*                *
*  Runge-Kutta method for tracking a particle through a magnetic *
*  field. Uses Nystroem algorithm (See Handbook Nat. Bur. of   *
*  Standards, procedure 25.5.20)         *
*                *
*  Input parameters            *
* CHARGE    Particle charge        *
* STEP    Step size          *
* VECT    Initial co-ords,direction cosines,momentum   *
*  Output parameters             *
* VOUT    Output co-ords,direction cosines,momentum  *
*  User routine called             *
* CALL GUFLD(X,F)            *
*                *
*    ==>Called by : USER, GUSWIM         *
* Authors    R.Brun, M.Hansroul  *********     *
*      V.Perevoztchikov (CUT STEP implementation)  *
*                *
*                *
******************************************************************

Definition at line 1531 of file AliMFTTrackExtrap.cxx.

Referenced by ExtrapToZRungekutta(), and IsFieldON().

void AliMFTTrackExtrap::ExtrapToVertex ( AliMFTTrackParam trackParam,
Double_t  xVtx,
Double_t  yVtx,
Double_t  zVtx,
Double_t  errXVtx,
Double_t  errYVtx 
)
static

Extrapolate track parameters to vertex, corrected for multiple scattering and energy loss effects Add branson correction resolution and energy loss fluctuation to parameter covariances

Definition at line 1179 of file AliMFTTrackExtrap.cxx.

Referenced by ExtrapToVertexUncorrected(), ExtrapToVertexWithoutBranson(), ExtrapToVertexWithoutELoss(), and IsFieldON().

void AliMFTTrackExtrap::ExtrapToVertex ( AliMFTTrackParam trackParam,
Double_t  xVtx,
Double_t  yVtx,
Double_t  zVtx,
Double_t  errXVtx,
Double_t  errYVtx,
Bool_t  correctForMCS,
Bool_t  correctForEnergyLoss 
)
staticprivate

Main method for extrapolation to the vertex: Returns the track parameters and covariances resulting from the extrapolation of the current trackParam Changes parameters and covariances according to multiple scattering and energy loss corrections: if correctForMCS=kTRUE: compute parameters using Branson correction and add correction resolution to covariances if correctForMCS=kFALSE: add parameter dispersion due to MCS in parameter covariances if correctForEnergyLoss=kTRUE: correct parameters for energy loss and add energy loss fluctuation to covariances if correctForEnergyLoss=kFALSE: do nothing about energy loss

Definition at line 1063 of file AliMFTTrackExtrap.cxx.

void AliMFTTrackExtrap::ExtrapToVertexUncorrected ( AliMFTTrackParam trackParam,
Double_t  zVtx 
)
static

Extrapolate track parameters to vertex without multiple scattering and energy loss corrections Add dispersion due to multiple scattering to parameter covariances

Definition at line 1207 of file AliMFTTrackExtrap.cxx.

Referenced by IsFieldON().

void AliMFTTrackExtrap::ExtrapToVertexWithoutBranson ( AliMFTTrackParam trackParam,
Double_t  zVtx 
)
static

Extrapolate track parameters to vertex, corrected for energy loss effects only Add dispersion due to multiple scattering and energy loss fluctuation to parameter covariances

Definition at line 1199 of file AliMFTTrackExtrap.cxx.

Referenced by IsFieldON().

void AliMFTTrackExtrap::ExtrapToVertexWithoutELoss ( AliMFTTrackParam trackParam,
Double_t  xVtx,
Double_t  yVtx,
Double_t  zVtx,
Double_t  errXVtx,
Double_t  errYVtx 
)
static

Extrapolate track parameters to vertex, corrected for multiple scattering effects only Add branson correction resolution to parameter covariances

Definition at line 1189 of file AliMFTTrackExtrap.cxx.

Referenced by IsFieldON().

Bool_t AliMFTTrackExtrap::ExtrapToZ ( AliMFTTrackParam trackParam,
Double_t  zEnd 
)
static

Interface to track parameter extrapolation to the plane at "Z" using Helix or Rungekutta algorithm. On return, the track parameters resulting from the extrapolation are updated in trackParam.

Definition at line 404 of file AliMFTTrackExtrap.cxx.

Referenced by ExtrapToZCov(), and IsFieldON().

Bool_t AliMFTTrackExtrap::ExtrapToZCov ( AliMFTTrackParam trackParam,
Double_t  zEnd,
Bool_t  updatePropagator = kFALSE 
)
static

Track parameters and their covariances extrapolated to the plane at "zEnd". On return, results from the extrapolation are updated in trackParam.

Definition at line 621 of file AliMFTTrackExtrap.cxx.

Referenced by AliMFTTrackReconstructor::AddMCSEffect(), IsFieldON(), and AliMFTTrackReconstructor::TraceTrack().

Bool_t AliMFTTrackExtrap::ExtrapToZHelix ( AliMFTTrackParam trackParam,
Double_t  Z 
)
staticprivate

Track parameter extrapolation to the plane at "Z" using Helix algorithm. On return, the track parameters resulting from the extrapolation are updated in trackParam.

Definition at line 418 of file AliMFTTrackExtrap.cxx.

Referenced by ExtrapToZ().

Bool_t AliMFTTrackExtrap::ExtrapToZRungekutta ( AliMFTTrackParam trackParam,
Double_t  Z 
)
staticprivate

Track parameter extrapolation to the plane at "Z" using Rungekutta algorithm. On return, the track parameters resulting from the extrapolation are updated in trackParam.

todo : change that

Definition at line 481 of file AliMFTTrackExtrap.cxx.

Referenced by ExtrapToZ().

Bool_t AliMFTTrackExtrap::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 
)
staticprivate

Parameters used to correct for Multiple Coulomb Scattering and energy loss in absorber Calculated assuming a linear propagation from trackXYZIn to trackXYZOut (order is important)

Definition at line 853 of file AliMFTTrackExtrap.cxx.

Referenced by TotalMomentumEnergyLoss().

Double_t AliMFTTrackExtrap::GetBendingMomentumFromImpactParam ( Double_t  impactParam)
static

Returns signed bending momentum in bending plane (GeV/c), the sign being the sign of the charge for particles moving forward in Z, from the impact parameter "ImpactParam" at vertex in bending plane (cm), using simple values for dipole magnetic field.

Definition at line 86 of file AliMFTTrackExtrap.cxx.

Referenced by IsFieldON().

Double_t AliMFTTrackExtrap::GetImpactParamFromBendingMomentum ( Double_t  bendingMomentum)
static

Returns impact parameter at vertex in bending plane (cm), from the signed bending momentum "BendingMomentum" in bending plane (GeV/c), using simple values for dipole magnetic field. The sign of "BendingMomentum" is the sign of the charge.

Definition at line 70 of file AliMFTTrackExtrap.cxx.

Referenced by IsFieldON().

Double_t AliMFTTrackExtrap::GetMCSAngle2 ( const AliMFTTrackParam param,
Double_t  dZ,
Double_t  x0 
)
static

Return the angular dispersion square due to multiple Coulomb scattering through a material of thickness "dZ" and of radiation length "x0" assuming linear propagation and using the small angle approximation.

Definition at line 974 of file AliMFTTrackExtrap.cxx.

Referenced by IsFieldON().

static Bool_t AliMFTTrackExtrap::IsFieldON ( )
inlinestatic

return kTRUE if the field is switched ON

Definition at line 34 of file AliMFTTrackExtrap.h.

void AliMFTTrackExtrap::LinearExtrapToZ ( AliMFTTrackParam trackParam,
Double_t  zEnd 
)
static

Track parameters linearly extrapolated to the plane at "zEnd". On return, results from the extrapolation are updated in trackParam.

Definition at line 351 of file AliMFTTrackExtrap.cxx.

Referenced by ExtrapToZ(), IsFieldON(), and LinearExtrapToZCov().

void AliMFTTrackExtrap::LinearExtrapToZCov ( AliMFTTrackParam trackParam,
Double_t  zEnd,
Bool_t  updatePropagator = kFALSE 
)
static

Track parameters and their covariances linearly extrapolated to the plane at "zEnd". On return, results from the extrapolation are updated in trackParam.

Definition at line 367 of file AliMFTTrackExtrap.cxx.

Referenced by ExtrapToZCov(), and IsFieldON().

Double_t AliMFTTrackExtrap::LinearRegression ( Int_t  nVal,
Double_t *  xVal,
Double_t *  yVal,
Double_t &  p0,
Double_t &  p1 
)
static

Perform a Linear Regression Return Chi2

Definition at line 227 of file AliMFTTrackExtrap.cxx.

Referenced by AliMFTCATrack::EvalSignedPt(), and IsFieldON().

AliMFTTrackExtrap& AliMFTTrackExtrap::operator= ( const AliMFTTrackExtrap trackExtrap)
private

Not implemented.

Double_t AliMFTTrackExtrap::QuadraticRegression ( Int_t  nVal,
Double_t *  xVal,
Double_t *  yVal,
Double_t &  p0,
Double_t &  p1,
Double_t &  p2 
)
static

Perform a Quadratic Regression Assume same error on all clusters = 1 Return ~ Chi2

Definition at line 259 of file AliMFTTrackExtrap.cxx.

Referenced by IsFieldON(), and Sagitta().

void AliMFTTrackExtrap::RecoverTrackParam ( Double_t *  v3,
Double_t  Charge,
AliMFTTrackParam trackParam 
)
staticprivate

Set track parameters in trackParam from Geant3 parameters pointed to by "v3", assumed to be calculated for forward motion in Z. "InverseBendingMomentum" is signed with "charge".

Definition at line 597 of file AliMFTTrackExtrap.cxx.

Referenced by ExtrapToZHelix(), and ExtrapToZRungekutta().

Double_t AliMFTTrackExtrap::Sagitta ( Int_t  nVal,
Double_t *  xVal,
Double_t *  yVal,
Double_t &  distL,
Double_t &  q2 
)
static

Calculate sagitta of the track Return sagitta

Definition at line 107 of file AliMFTTrackExtrap.cxx.

Referenced by IsFieldON().

void AliMFTTrackExtrap::SetField ( )
static

set field on/off flag; set field at the centre of the MFT

Definition at line 56 of file AliMFTTrackExtrap.cxx.

Referenced by AliMFTTrackReconstructor::AliMFTTrackReconstructor(), and ~AliMFTTrackExtrap().

Double_t AliMFTTrackExtrap::TotalMomentumEnergyLoss ( AliMFTTrackParam trackParam,
Double_t  xVtx,
Double_t  yVtx,
Double_t  zVtx 
)
static

Calculate the total momentum energy loss in-between the track position and the vertex assuming a linear propagation

Definition at line 1215 of file AliMFTTrackExtrap.cxx.

Referenced by IsFieldON().

Member Data Documentation

Bool_t AliMFTTrackExtrap::fgFieldON = kFALSE
staticprivate

! kTRUE if the field is switched ON

Definition at line 87 of file AliMFTTrackExtrap.h.

Referenced by ExtrapToZ(), ExtrapToZCov(), and IsFieldON().

const Double_t AliMFTTrackExtrap::fgkHelixStepLength = 0.1
staticprivate

! Step lenght for track extrapolation (used in Helix)

Definition at line 90 of file AliMFTTrackExtrap.h.

Referenced by ExtrapToZHelix().

const Int_t AliMFTTrackExtrap::fgkMaxStepNumber = 5000
staticprivate

! Maximum number of steps for track extrapolation

Definition at line 89 of file AliMFTTrackExtrap.h.

Referenced by ExtrapToZHelix(), and ExtrapToZRungekutta().

const Double_t AliMFTTrackExtrap::fgkRungeKuttaMaxResidue = 0.002
staticprivate

! Maximal distance (in Z) to destination to stop the track extrapolation (used in Runge-Kutta)

Definition at line 91 of file AliMFTTrackExtrap.h.

Referenced by ExtrapToZRungekutta().

const Double_t AliMFTTrackExtrap::fgkSimpleBLength
staticprivate

! length of the dipole

Definition at line 85 of file AliMFTTrackExtrap.h.

const Double_t AliMFTTrackExtrap::fgkSimpleBPosition = 0.5 * (AliMFTConstants::DefaultPlaneZ(0) + AliMFTConstants::DefaultPlaneZ(9))
staticprivate

! position of the dipole

Definition at line 84 of file AliMFTTrackExtrap.h.

const Bool_t AliMFTTrackExtrap::fgkUseHelix = kTRUE
staticprivate

! Tell whether to use Helix or not (default is Runge-Kutta)

Definition at line 88 of file AliMFTTrackExtrap.h.

Referenced by ExtrapToZ().

Double_t AliMFTTrackExtrap::fgSimpleBValue = 0.
staticprivate

! magnetic field value at the centre

Definition at line 86 of file AliMFTTrackExtrap.h.

Referenced by Sagitta().


The documentation for this class was generated from the following files: