Track Class Reference

C++ STL includes. More...

#include <Track.hh>

Inherits std::vector<StHit*>.

List of all members.

Classes
struct	LessHit
	Comparison between hits using z-coordinate.
Public Member Functions
StHit *	firstHit () const
	First hit.
StHit *	lastHit () const
	Last hit.
void	merge (Track *track)
	Merge this track with that track.
bool	fit ()
	Perform linear fits in zx- and zy-plane.
double	chi2zx ()
	chi square of linear fit in zx-plane
double	chi2zy ()
	chi square of linear fit in zy-plane
int	ndf () const
	Number of degrees of freedom.
bool	ok () const
	Good track?
bool	accept (StHit *hit) const
	Is hit close enough to track?
double	length () const
	Track length.
double	x0 () const
	x-intercept at z = 0
double	y0 () const
	y-intercept at z = 0
double	dxdz () const
	dx/dz slope
double	dydz () const
	dy/dz slope
double	x0error () const
	Error on x-intercept.
double	y0error () const
	Error on y-intercept.
double	dxdzError () const
	Error on dx/dz slope.
double	dydzError () const
	Error on dy/dz slope.
	Track (Int_t sector, StTrack *track, LaserB *laser=0, Double_t z=0)
Int_t	Matched ()
void	SetPredictions (TGeoHMatrix *Raft2Tpc=0, TGeoHMatrix *Bundle2Tpc=0, TGeoHMatrix *Mirror2Tpc=0)
virtual void	Print (const Option_t *opt="") const
Public Attributes
Int_t	Flag
StVertexId	mType
StThreeVectorD	Vertex
Int_t	mSector
Int_t	mKey
Short_t	mFlag
UShort_t	mNumberOfPossiblePointsTpc
Float_t	mImpactParameter
Float_t	mLength
UShort_t	mNumberOfFitPointsTpc
UShort_t	mPrimaryVertexUsedInFit
Int_t	fNdEdx
Float_t	fdEdx
StHelixModel	fgeoIn
StHelixModel	fgeoOut
Double32_t	fpTInv
Double32_t	fTheta
Double32_t	fPhi
StThreeVectorD	XyzP
StThreeVectorD	XyzPL
StThreeVectorD	XyzPU
StThreeVectorD	XyzPB
StThreeVectorD	XyzPM
StThreeVectorD	dirP
StThreeVectorD	dirPL
StThreeVectorD	dirPU
StThreeVectorD	dirPB
StThreeVectorD	dirPM
StThreeVectorD	dU
Double32_t	thePath
LaserB	Laser
Double32_t	dPhi
Double32_t	dTheta
Double32_t	zLastHit

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Detailed Description

C++ STL includes.

Author:

Pibero Djawotho <pibero@iucf.indiana.edu> Indiana University November 17, 2005 ROOT includes STAR includes Beam background track Class to hold information about a beam background track. In particular, a Track contains all the hits associated with it and two linear fitters used to fit the track to lines in the zx- and zy-plane.

Definition at line 32 of file Track.hh.

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Member Function Documentation

bool Track::accept

(

StHit *

hit

)

const

Is hit close enough to track?

Returns:

true if the radial distance in the xy-plane between the hit and a point on the line at the same z-location as the hit is less than 5 cm, false otherwise.

Definition at line 67 of file Track.cc.

References dxdz(), dydz(), x0(), and y0().

bool Track::fit

(

)

Perform linear fits in zx- and zy-plane.

Returns:

true if fit succeeded, false otherwise

Definition at line 26 of file Track.cc.

References firstHit(), lastHit(), and Line::perigee().

double Track::length

(

)

const [inline]

Track length.

Returns:

Distance between the point of closest approach to the first hit and the point of closest approach to the last hit on the track.

Definition at line 166 of file Track.hh.

bool Track::ok

(

)

const

Good track?

Returns:

true if the absolute value of the slopes in the zx- and zy-plane are both less than MAX_SLOPE (= 0.1), false otherwise.

Definition at line 62 of file Track.cc.

References dxdz(), and dydz().

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

• StBeamBackMaker/Track.hh
• StLaserAnalysisMaker/LaserEvent.h
• StBeamBackMaker/Track.cc
• StLaserAnalysisMaker/LaserEvent.cxx