Simple $\chi^2$ implementation of a track fitter. More...

#include <TrackFitterSimpleChiSquare.h>

Inheritance diagram for marlintpc::TrackFitterSimpleChiSquare:

Public Member Functions
	TrackFitterSimpleChiSquare (double transDefocussing, double longDefocussing, double transDiffusion, double longDiffusion, double zAnode)
	Constructor for $\chi^2$ fitter, initializes the track fitter with the initial values.

virtual std::string	getRevision () const
	returns the revision of this implementation and of the TrackFitterBase it is derrived from

virtual IMPL::TrackImpl *	fitTrack (EVENT::Track const *seedTrack) const
	The actual fitter. Not implemented yet, thows gear::NotImplementedException. More...

virtual unsigned char	getFitterType () const
	returns "SimpleChiSquare"

virtual double	getTransDefocussing () const
	The transverse defocussing in the readout structure $\sigma_{0,{\mathrm trans}}$ (in mm)

virtual double	getLongDefocussing () const
	The longitudinal defocussing in the readout structure $\sigma_{0,{\mathrm long}}$ (in mm)

virtual double	getTransDiffusionCoef () const
	The transverse diffusion coefficient (in mm/ $\sqrt{\mathrm mm}$ )

virtual double	getLongDiffusionCoef () const
	The longitudinal diffusion coefficient (in mm/ $\sqrt{\mathrm mm}$ )

virtual double	getZAnode () const
	The z coordinate of the readout anode (termination of drift volume)

Public Member Functions inherited from marlintpc::TrackFitterBase
	TrackFitterBase ()
	The Constructor. More...

virtual EVENT::DoubleVec	calculateResiduals (EVENT::Track const testTrack, unsigned int testHitNumber, EVENT::Track const referenceTrack=NULL) const
	Return the distance of the hit `testHitNumber` of the testTrack to the point of closest approach on the referenceTrack wrt. the hit. More...

virtual EVENT::DoubleVec	calculateResiduals (EVENT::TrackerHit const testHit, EVENT::Track const trackWithoutTestHit) const
	Return the distance of the given hit to the test track where this hit has been removed. More...

void	setD0Start (double d0)
	Set a d0 start value for the fit. More...

void	setPhiStart (double phi)
	Set a phi start value for the fit. More...

void	setOmegaStart (double omega)
	Set a omega start value for the fit. More...

void	setTanLambdaStart (double tanLambda)
	Set a tanLambda start value for the fit. More...

void	setZ0Start (double z0)
	Set a z0 start value for the fit. More...

void	setNoZFitFlag (bool noZFit=true)
	Switch to turn off the fitting in z. More...

bool	getNoZFitFlag () const
	Get the noZFit flag.

void	fixD0 (bool fix=true)
	Fix or release d0.

void	fixPhi (bool fix=true)
	Fix or release phi.

void	fixOmega (bool fix=true)
	Fix or release omega.

void	fixTanLambda (bool fix=true)
	Fix or release tanLambda.

void	fixZ0 (bool fix=true)
	Fix or release z0.

Static Public Member Functions
static TrackFitterBase *	getInstance (LCParameters const *parameters)
	Well defined interface to create a new instance of the track fitter.

Static Public Member Functions inherited from marlintpc::TrackFitterBase
static void	setTrackFitterType (unsigned char type, IMPL::TrackImpl *track)
	Convenience function to set bits 16-23 to be the track type.

static unsigned char	getFitterTypeFromTrack (int trackTypeWord)
	Convenicene function to get the tracker type out of the trackType word.

Protected Attributes
double	_transDefocussing
	The defocussing and diffusion coefficients.

double	_longDefocussing

double	_transDiffusion

double	_longDiffusion

double	_zAnode
	The z coordinate of the readout anode.

Protected Attributes inherited from marlintpc::TrackFitterBase
double	_d0Start
	The start value for the fit and a flag whether to apply d0Start or the value from the seed track.

bool	_useD0Start

double	_phiStart
	The start value for the fit and a flag whether to apply phiStart or the value from the seed track.

bool	_usePhiStart

double	_omegaStart
	The start value for the fit and a flag whether to apply omegaStart or the value from the seed track.

bool	_useOmegaStart

double	_tanLambdaStart
	The start value for the fit and a flag whether to apply tanLambdaStart or the value from the seed track.

bool	_useTanLambdaStart

double	_z0Start
	The start value for the fit and a flag whether to apply z0Start or the value from the seed track.

bool	_useZ0Start

bool	_noZFit
	flag whether to perform a 2D or a 3D fit

bool	_fixD0
	flags whether to fix a fit parameter

bool	_fixPhi

bool	_fixOmega

bool	_fixTanLambda

bool	_fixZ0

Additional Inherited Members
Static Public Attributes inherited from marlintpc::TrackFitterBase
static const unsigned char	FITFAILEDBIT = 30
	Bit 30 in the TrackType word is fit failed.

Protected Member Functions inherited from marlintpc::TrackFitterBase
double	distanceOnCircle (double phi1, double phi2) const
	Calculate the angular distance on a circle. More...

Detailed Description

Simple $\chi^2$ implementation of a track fitter.

It uses the getResiduals functions derrived from TrackFitterBase. The error of each hit are calculated according to
$\displaystyle \sigma_{\mathrm trans} = \sqrt{\sigma_{0,{\mathrm trans}}^2 + (D_{\mathrm trans} \sqrt{z})^2}$
$\displaystyle \sigma_{\mathrm long} = \sqrt{\sigma_{0,{\mathrm long}}^2 + (D_{\mathrm long} \sqrt{z})^2}$