#include <StGenericVertexFinder.h>

Inheritance diagram for StGenericVertexFinder:

Public Types
using	StDcaList = std::vector< const StDcaGeometry * >

using	VertexFit_t = star_vertex::VertexFit_t

using	SeedFinder_t = star_vertex::SeedFinder_t
	Options to select vertex seed finder.

Public Member Functions
virtual int	fit (StEvent *)=0

StPrimaryVertex *	getVertex (int idx) const

void	addVertex (const StPrimaryVertex &vtx)

int	size () const

void	UseVertexConstraint (const vertexSeed_st &beamline)

void	NoVertexConstraint ()

int	IsVertexConstraint () const

virtual void	UsePCT (bool usePCT=true)

virtual void	UseBTOF (bool useBTOF=true)

virtual void	UseCTB (bool useCTB=true)

virtual void	printInfo (ostream &=cout) const =0

virtual void	SetMode (Int_t mode=0)

virtual int	GetMode () const

void	SetDebugLevel (Int_t level)

virtual void	Init ()

virtual void	Finish ()

virtual void	InitRun (int run_number, const St_db_Maker *db_maker)

virtual void	Clear ()

const std::vector < StPrimaryVertex > *	result ()

void	result (TClonesArray &stMuDstPrimaryVertices)

void	FillStEvent (StEvent *)

virtual void	SetVertexPosition (double x, double y, double z)

virtual void	SetVertexError (double x, double y, double z)

virtual int	IsFixed () const

virtual int	fit (const StMuDst &muDst)

Protected Member Functions
	StGenericVertexFinder ()
	Default initialization with unspecified seed finder and fitting mode.

	StGenericVertexFinder (SeedFinder_t seedFinder, VertexFit_t fitMode)

std::vector< double >	FindSeeds_TSpectrum ()

double	beamX (double z) const

double	beamY (double z) const

StThreeVectorD	CalcVertexSeed (const StDcaList &trackDcas)

virtual double	CalcChi2DCAs (const StThreeVectorD &point)
	Caclulates total chi2 for the track DCAs stored in mDCAs and a point.

double	CalcChi2Beamline (const StThreeVectorD &point)
	Caclulates chi2 for the beamline and a point. More...

double	CalcChi2DCAsBeamline (const StThreeVectorD &point)
	Caclulates total chi2 for the beamline and track DCAs stored in mDCAs and a point.

Static Protected Member Functions
static void	fcnCalcChi2DCAs (int &npar, double gin, double &f, double par, Int_t iflag)

static void	fcnCalcChi2DCAsBeamline1D (int &npar, double gin, double &f, double par, Int_t iflag)
	A static interface to CalcChi2DCAs(...) with x and y fixed by beamline equation.

static void	fcnCalcChi2DCAsBeamline (int &npar, double gin, double &f, double par, int iflag)
	A static interface to CalcChi2DCAsBeamline(...)

Protected Attributes
StPrimaryVertexOrder	mVertexOrderMethod

bool	mVertexConstrain

int	mMode

VertexFit_t	mVertexFitMode
	The type of vertex fit to use in derived concrete implementation.

SeedFinder_t	mSeedFinderType
	The type of vertex seed finder to use in derived concrete implementation.

int	mDebugLevel

bool	mUseBtof

bool	mUseCtb

vertexSeed_st	mBeamline

StDcaList	mDCAs

TMinuit *	mMinuit

Static Protected Attributes
static StGenericVertexFinder *	sSelf = nullptr
	By default point to invalid object. More...

Detailed Description

Author: Lee Barnby, April 2003

(pseudo) Base class for vertex finders

Id:: StGenericVertexFinder.h,v 1.58 2020/09/13 02:55:56 genevb Exp

Definition at line 30 of file StGenericVertexFinder.h.

Member Typedef Documentation

using StGenericVertexFinder::VertexFit_t = star_vertex::VertexFit_t

Options used to define the type of vertex fit performed in a concrete implementation

Definition at line 39 of file StGenericVertexFinder.h.

Member Function Documentation

double StGenericVertexFinder::beamX ( double z ) const

protected

Returns x coordinate on the beamline (given by mBeamline) corresponding to the passed value of z.

Definition at line 431 of file StGenericVertexFinder.cxx.

References mBeamline.

Referenced by fcnCalcChi2DCAsBeamline1D().

double StGenericVertexFinder::beamY ( double z ) const

protected

Returns y coordinate on the beamline (given by mBeamline) corresponding to the passed value of z.

Definition at line 441 of file StGenericVertexFinder.cxx.

References mBeamline.

Referenced by fcnCalcChi2DCAsBeamline1D().

double StGenericVertexFinder::CalcChi2Beamline ( const StThreeVectorD & point )

protected

Caclulates chi2 for the beamline and a point.

Calculates chi^2 for the beamline and a point (xv, yv, zv) passed as input argument.

The beamline parameters are taken from this class member object mBeamline of vertexSeed_st type which is initialized in UseVertexConstraint().

The distance between the beamline and the point is experssed in terms of the measured beamline parameters and the point's coordinates. We then calculate the Jacobian for thus parameterized distance w.r.t. measured parameters, and calculate the error on the distance itself by calculating a new covariance matrix S' = JSJ^T. Note that in the representation along the line connecting the poin with the beamline the covariance matrix has a dimension of 1.

Author: Dmitri Smirnov

Date: April, 2016

Definition at line 277 of file StGenericVertexFinder.cxx.

References mBeamline.

Referenced by CalcChi2DCAsBeamline().

StThreeVectorD StGenericVertexFinder::CalcVertexSeed ( const StDcaList & trackDcas )

protected

Recalculates the vertex position from DCA measurements in the input list of DCAs

Estimates vertex position from track DCA states in mDCAs. The beam position is not taken into account.

Author: Dmitri Smirnov

Date: April 2016

Definition at line 358 of file StGenericVertexFinder.cxx.

void StGenericVertexFinder::FillStEvent ( StEvent * event )

Adds the vertex to StEvent (currently as a primary) Here we invent our own flag and other data to put in In real life we have to get it from somewhere (as done for position)

Definition at line 94 of file StGenericVertexFinder.cxx.

Referenced by StiStarVertexFinder::fit(), and StGenericVertexMaker::Make().

std::vector< double > StGenericVertexFinder::FindSeeds_TSpectrum ( )

protected

Searches for vertex candidates and fills private mVertexData container using the ROOT's TSpectrum peak finder applied to the distribution of track DCAs along the z axis

Searches for vertex seeds using the ROOT's TSpectrum peak finder applied to track's DCA z distribution. This method can be transfered to a separate class complying with a VertexSeedFinder interface (not available as of now). Returns a vector of peak positions along the z. We copy the result to a vector because TSpectrum::GetPositionX() may return either float* or double* depending on ROOT version.

Definition at line 123 of file StGenericVertexFinder.cxx.

References mDCAs.

void StGenericVertexFinder::UseVertexConstraint ( const vertexSeed_st & beamline )

Stores beamline parameters (aka vertexSeed) from DB record in this class member mBeamline.

Definition at line 404 of file StGenericVertexFinder.cxx.

References mBeamline, and UseVertexConstraint().

Referenced by UseVertexConstraint().