ChargedParticleTrack Class Reference

A helix track of a charged particle with start and stop vertex. More...

#include <ChargedParticleTrack.h>

Inheritance diagram for ChargedParticleTrack:

[legend]Collaboration diagram for ChargedParticleTrack:


Public Member Functions
	ChargedParticleTrack (const char *name_, double kappa, double phi0, double theta, double dca, double z0, double mass, double charge_, double sstart, double sstop)
	Constructor from (kappa, phi0, theta, dca, z0, mass, sstart, sstop).
	ChargedParticleTrack (const char *name_, double kappa, double phi0, double theta, double dca, double z0, double mass, double charge_, double sstart)
	Constructor from (kappa, phi0, theta, dca, z0, mass, sstart).
	ChargedParticleTrack (const char *name_, const ThreeVector &vertex, const ThreeVector &momentum, double mass_, double charge_=1)
	Constructor from a (start) vertex and a momentum vector.
	ChargedParticleTrack (const char *name_, const float par_[5], const float cov_[15], double mass_, double charge_=1, double sstart=0, double sstop=0)
	Constructor from an array of parameters, an array of covariances.
virtual	~ChargedParticleTrack ()
	Destructor.
virtual int	getNPar () const
	Get number of parameters of this FitObject.
virtual bool	setParam (int ilocal, double par_, bool measured_, bool fixed_=false)
	Set value and measured flag of parameter ilocal; return=success.
virtual bool	setParam (int ilocal, double par_)
	Set value of parameter ilocal; return=success.
virtual bool	setParameters (int ivertex, const ThreeVector &vertex, const FourVector &momentum, double charge_)
	Set parameters such that track passes through a vertex with a given 4-momentum; return=success.
virtual const char *	getParamName (int ilocal) const
	Get name of parameter ilocal.
virtual void	getTrajectoryPointEx (double s, ThreeVector &p) const
	Get point along trajectory into existing 3-vector.
virtual void	getVertexEx (int ivertex, ThreeVector &p) const
	Get start (ivertex=0) or stop (ivertex=1) vertex into existing 3-vector.
virtual void	setVertex (int ivertex, const TwoVector &p)
	Set start (i=0) or stop (i=1) vertex to a point as close as possible to given point.
virtual void	getTrajectoryDerivativeEx (double s, int ilocal, ThreeVector &p) const
	Get derivative of trajectory w.r.t. parameter ilocal into existing 3-vector.
virtual void	getVertexDerivativeEx (int ivertex, int ilocal, ThreeVector &p) const
	Get derivative of vertex w.r.t. parameter ilocal into existing 3-vector.
virtual void	getMomentumAtTrajectoryEx (double s, FourVector &p) const
	Get momentum along trajectory into existing 4-vector.
virtual void	getMomentumEx (int ivertex, FourVector &p) const
	Get momentum at vertex into existing 4-vector.
virtual double	getCharge () const
	Get charge in units of e.
virtual void	getMomentumDerivativeAtTrajectoryEx (double s, int ilocal, FourVector &p) const
	Get momentum derivative along trajectory into existing 4-vector.
virtual void	getMomentumDerivativeEx (int ivertex, int ilocal, FourVector &p) const
	Get derivative of momentum w.r.t. parameter ilocal into existing 4-vector.
virtual double	getArcLength (int i) const
	Get s (arclength in r/phi) of vertex i.
virtual double	getDChi2DParam (int ilocal) const
	Get derivative of chi squared w.r.t. parameter ilocal.
virtual double	getD2Chi2DParam2 (int ilocal1, int ilocal2) const
	Get second derivative of chi squared w.r.t. parameters ilocal1 and ilocal2.
virtual void	addToGlobalChi2DerMatrix (int idim, double *M) const
	Add derivatives of chi squared to global covariance matrix.
virtual void	addToGlobalDerMatrix (int idim, double c, double *M) const
	Add derivatives to global covariance matrix.
virtual JBLHelix	getTangentialHelix (double s)
	Get helix that is tangential at a certain arc length s.
virtual double	getMass () const
	get Mass
virtual bool	fixVertexParam (int ivertex, bool fix=true)
	Fix parameter(s) pertaining to a vertex, or release it.
Static Public Attributes
const double	parfact [NPARMAX]
	Factor between internal and external parameters.
Protected Types
enum	{ NPAR = 8 }
	Number of parameters. More...
Protected Member Functions
void	updateCache () const
	Update the cache values.
virtual void	initCov (const float cov_[15])
	init covariance matrix from an array
double	getNormalS (double s) const
	Get smallest s that corresponds to same (x, y).
Protected Attributes
double	kappa
	kappa = parfact[0]*par[0]
double	phi0
	phi0 = parfact[1]*par[1]
double	theta
	theta = parfact[2]*par[2]
double	dca
	dca = parfact[3]*par[3]
double	z0
	z0 = parfact[4]*par[4]
double	mass
	mass = parfact[5]*par[5]
double	r
	1/kappa
double	sphi0
	sin(phi0)
double	cphi0
	cos(phi0)
double	dcamir
	dca - r
double	cottheta
	cotan (theta)
double	sintheta
	sin (theta)
double	sin2theta
	sin^2 (theta)
double	cBq
	cB * charge
double	pt
	-cBq/kappa
double	momentum
	-cBq/[kappa*sin(theta)];
double	momderfact
	+cBq/kappa^2;
double	energy
	sqrt ((cB/[kappa*sin(theta)])^2 + mass^2)
double	beta
	momentum/energy;
double	charge
	charge (in units of e)

Detailed Description

A helix track of a charged particle with start and stop vertex.

Parameters:

0: kappa (signed: kappa < 0 <=> charge > 0)
1: phi0
2: theta
3: dca
4: z0
5: mass
6: sstart (s value of start vertex)
7: sstop (s value of stop vertex)

Definition at line 38 of file ChargedParticleTrack.h.

Member Enumeration Documentation

anonymous enum [protected]

Number of parameters.

Enumeration values:

NPAR

Definition at line 194 of file ChargedParticleTrack.h.

Constructor & Destructor Documentation

ChargedParticleTrack::ChargedParticleTrack ( const char * name_,

double kappa,

double phi0,

double theta,

double dca,

double z0,

double mass,

double charge_,

double sstart,

double sstop

)

Constructor from (kappa, phi0, theta, dca, z0, mass, sstart, sstop).

Definition at line 32 of file ChargedParticleTrack.C.
References TrackFitObject::initCov(), parfact, TrackFitObject::setMParam(), and setParam().

ChargedParticleTrack::ChargedParticleTrack ( const char * name_,

double kappa,

double phi0,

double theta,

double dca,

double z0,

double mass,

double charge_,

double sstart

)

Constructor from (kappa, phi0, theta, dca, z0, mass, sstart).

Definition at line 60 of file ChargedParticleTrack.C.
References TrackFitObject::initCov(), parfact, TrackFitObject::setMParam(), and setParam().

ChargedParticleTrack::ChargedParticleTrack ( const char * name_,

const ThreeVector & vertex,

const ThreeVector & momentum,

double mass_,

double charge_ = 1

)

Constructor from a (start) vertex and a momentum vector.

Definition at line 87 of file ChargedParticleTrack.C.
References TrackFitObject::bfield, cBq, charge, dca, FourVector::getPhi(), FourVector::getPt(), FourVector::getTheta(), ThreeVector::getX(), ThreeVector::getY(), ThreeVector::getZ(), TrackFitObject::initCov(), kappa, parfact, phi0, r, TrackFitObject::setMParam(), setParam(), setParameters(), theta, and z0.

ChargedParticleTrack::ChargedParticleTrack ( const char * name_,

const float par_[5],

const float cov_[15],

double mass_,

double charge_ = 1,

double sstart = 0,

double sstop = 0

)

Constructor from an array of parameters, an array of covariances.

Definition at line 152 of file ChargedParticleTrack.C.
References TrackFitObject::calculateCovInv(), TrackFitObject::initCov(), parfact, TrackFitObject::setMParam(), and setParam().

ChargedParticleTrack::~ChargedParticleTrack ( ) [virtual]

Destructor.

Definition at line 178 of file ChargedParticleTrack.C.

Member Function Documentation

virtual void ChargedParticleTrack::addToGlobalChi2DerMatrix ( int idim,

double * M

) const [inline, virtual]

Add derivatives of chi squared to global covariance matrix.

Implements TrackFitObject.
Definition at line 165 of file ChargedParticleTrack.h.

virtual void ChargedParticleTrack::addToGlobalDerMatrix ( int idim,

double c,

double * M

) const [inline, virtual]

Add derivatives to global covariance matrix.

Implements TrackFitObject.
Definition at line 167 of file ChargedParticleTrack.h.

virtual bool ChargedParticleTrack::fixVertexParam ( int ivertex,

bool fix = true

) [inline, virtual]

Fix parameter(s) pertaining to a vertex, or release it.

Parameters:

ivertex Vertex number

fix fix if true, release if false

Implements TrackFitObject.
Definition at line 179 of file ChargedParticleTrack.h.
References TrackFitObject::fixParam().

double ChargedParticleTrack::getArcLength ( int i ) const [virtual]

Get s (arclength in r/phi) of vertex i.

Implements TrackFitObject.
Definition at line 509 of file ChargedParticleTrack.C.
References NPAR, TrackFitObject::par, and parfact.

double ChargedParticleTrack::getCharge ( ) const [virtual]

Get charge in units of e.

Implements TrackFitObject.
Definition at line 432 of file ChargedParticleTrack.C.
References charge, and kappa.
Referenced by K0Event::createSmearedChargedTrack().

virtual double ChargedParticleTrack::getD2Chi2DParam2 ( int ilocal1,

int ilocal2

) const [inline, virtual]

Get second derivative of chi squared w.r.t. parameters ilocal1 and ilocal2.

Implements TrackFitObject.
Definition at line 162 of file ChargedParticleTrack.h.

virtual double ChargedParticleTrack::getDChi2DParam ( int ilocal ) const [inline, virtual]

Get derivative of chi squared w.r.t. parameter ilocal.

Implements TrackFitObject.
Definition at line 160 of file ChargedParticleTrack.h.

double ChargedParticleTrack::getMass ( ) const [virtual]

get Mass

Implements TrackFitObject.
Definition at line 436 of file ChargedParticleTrack.C.
References TrackFitObject::par, and parfact.
Referenced by K0Event::createSmearedChargedTrack().

void ChargedParticleTrack::getMomentumAtTrajectoryEx ( double s,

FourVector & p

) const [virtual]

Get momentum along trajectory into existing 4-vector.

Implements TrackFitObject.
Definition at line 418 of file ChargedParticleTrack.C.
References TrackFitObject::cachevalid, cottheta, energy, kappa, phi0, pt, FourVector::setValues(), and updateCache().
Referenced by getMomentumEx().

void ChargedParticleTrack::getMomentumDerivativeAtTrajectoryEx ( double s,

int ilocal,

FourVector & p

) const [virtual]

Get momentum derivative along trajectory into existing 4-vector.

Implements TrackFitObject.
Definition at line 440 of file ChargedParticleTrack.C.
References beta, TrackFitObject::cachevalid, cBq, cottheta, energy, kappa, momderfact, momentum, NPAR, TrackFitObject::par, parfact, phi0, pt, FourVector::setValues(), sin2theta, and updateCache().
Referenced by getMomentumDerivativeEx().

void ChargedParticleTrack::getMomentumDerivativeEx ( int ivertex,

int ilocal,

FourVector & p

) const [virtual]

Get derivative of momentum w.r.t. parameter ilocal into existing 4-vector.

Implements TrackFitObject.
Definition at line 493 of file ChargedParticleTrack.C.
References getMomentumDerivativeAtTrajectoryEx(), NPAR, TrackFitObject::par, parfact, and FourVector::setValues().

void ChargedParticleTrack::getMomentumEx ( int ivertex,

FourVector & p

) const [virtual]

Get momentum at vertex into existing 4-vector.

Implements TrackFitObject.
Definition at line 427 of file ChargedParticleTrack.C.
References getMomentumAtTrajectoryEx(), NPAR, TrackFitObject::par, and parfact.

double ChargedParticleTrack::getNormalS ( double s ) const [protected]

Get smallest s that corresponds to same (x, y).

Definition at line 573 of file ChargedParticleTrack.C.
References kappa, TrackFitObject::par, and parfact.
Referenced by setParameters(), and setVertex().

int ChargedParticleTrack::getNPar ( ) const [virtual]

Get number of parameters of this FitObject.

Implements TrackFitObject.
Definition at line 181 of file ChargedParticleTrack.C.
References NPAR.

const char * ChargedParticleTrack::getParamName ( int ilocal ) const [virtual]

Get name of parameter ilocal.

Parameters:

ilocal Local parameter number

Reimplemented from BaseFitObject.
Definition at line 185 of file ChargedParticleTrack.C.

JBLHelix ChargedParticleTrack::getTangentialHelix ( double s ) [virtual]

Get helix that is tangential at a certain arc length s.

Parameters:

s Arc length

Implements TrackFitObject.
Definition at line 563 of file ChargedParticleTrack.C.
References TrackFitObject::par, and parfact.

void ChargedParticleTrack::getTrajectoryDerivativeEx ( double s,

int ilocal,

ThreeVector & p

) const [virtual]

Get derivative of trajectory w.r.t. parameter ilocal into existing 3-vector.

Implements TrackFitObject.
Definition at line 310 of file ChargedParticleTrack.C.
References TrackFitObject::cachevalid, cottheta, cphi0, dca, dcamir, kappa, NPAR, parfact, phi0, r, ThreeVector::setValues(), sin2theta, sphi0, and updateCache().
Referenced by getVertexDerivativeEx().

void ChargedParticleTrack::getTrajectoryPointEx ( double s,

ThreeVector & p

) const [virtual]

Get point along trajectory into existing 3-vector.

Implements TrackFitObject.
Definition at line 288 of file ChargedParticleTrack.C.
References TrackFitObject::cachevalid, cottheta, cphi0, dca, dcamir, kappa, phi0, r, ThreeVector::setValues(), sphi0, updateCache(), and z0.
Referenced by getVertexEx().

void ChargedParticleTrack::getVertexDerivativeEx ( int ivertex,

int ilocal,

ThreeVector & p

) const [virtual]

Get derivative of vertex w.r.t. parameter ilocal into existing 3-vector.

Implements TrackFitObject.
Definition at line 402 of file ChargedParticleTrack.C.
References getTrajectoryDerivativeEx(), NPAR, TrackFitObject::par, parfact, and ThreeVector::setValues().

void ChargedParticleTrack::getVertexEx ( int ivertex,

ThreeVector & p

) const [virtual]

Get start (ivertex=0) or stop (ivertex=1) vertex into existing 3-vector.

Implements TrackFitObject.
Definition at line 375 of file ChargedParticleTrack.C.
References getTrajectoryPointEx(), NPAR, TrackFitObject::par, and parfact.

void ChargedParticleTrack::initCov ( const float cov_[15] ) [protected, virtual]

init covariance matrix from an array

Definition at line 547 of file ChargedParticleTrack.C.
References TrackFitObject::checkCov(), TrackFitObject::cov, TrackFitObject::covinvvalid, TrackFitObject::initCov(), and parfact.

bool ChargedParticleTrack::setParam ( int ilocal,

double par_

) [virtual]

Set value of parameter ilocal; return=success.

Parameters:

ilocal Local parameter number

par_ New parameter value

Reimplemented from TrackFitObject.
Definition at line 268 of file ChargedParticleTrack.C.
References TrackFitObject::invalidateCache(), NPAR, TrackFitObject::par, and parfact.

bool ChargedParticleTrack::setParam ( int ilocal,

double par_,

bool measured_,

bool fixed_ = false

) [virtual]

Set value and measured flag of parameter ilocal; return=success.

Parameters:

ilocal Local parameter number

par_ New parameter value

measured_ New "measured" flag

fixed_ New "fixed" flag

Reimplemented from TrackFitObject.
Definition at line 199 of file ChargedParticleTrack.C.
References TrackFitObject::fixed, TrackFitObject::invalidateCache(), TrackFitObject::measured, and TrackFitObject::NPARMAX.
Referenced by ChargedParticleTrack(), and setParameters().

bool ChargedParticleTrack::setParameters ( int ivertex,

const ThreeVector & vertex,

const FourVector & momentum,

double charge_

) [virtual]

Set parameters such that track passes through a vertex with a given 4-momentum; return=success.

Parameters:

ivertex Vertex number: 0=start, 1=stop

vertex Vertex position

momentum Four-momentum

charge_ Charge (signed, in units of e)

Implements TrackFitObject.
Definition at line 208 of file ChargedParticleTrack.C.
References TrackFitObject::bfield, cBq, charge, dca, FourVector::getMass(), getNormalS(), FourVector::getPhi(), FourVector::getPt(), FourVector::getTheta(), ThreeVector::getX(), ThreeVector::getY(), ThreeVector::getZ(), TrackFitObject::isParamFixed(), kappa, mass, NPAR, TrackFitObject::par, parfact, phi0, r, setParam(), theta, and z0.
Referenced by ChargedParticleTrack().

void ChargedParticleTrack::setVertex ( int ivertex,

const TwoVector & p

) [virtual]

Set start (i=0) or stop (i=1) vertex to a point as close as possible to given point.

Parameters:

ivertex Vertex number: 0=start, 1=stop

p Vertex position

Implements TrackFitObject.
Definition at line 380 of file ChargedParticleTrack.C.
References TrackFitObject::cachevalid, cphi0, dca, dcamir, getNormalS(), TwoVector::getX(), TwoVector::getY(), kappa, NPAR, TrackFitObject::par, parfact, phi0, r, sphi0, and updateCache().

void ChargedParticleTrack::updateCache ( ) const [protected]

Update the cache values.

Definition at line 514 of file ChargedParticleTrack.C.
References beta, TrackFitObject::bfield, TrackFitObject::cachevalid, TrackFitObject::calculateChi2(), cBq, charge, cottheta, cphi0, dca, dcamir, energy, kappa, mass, momderfact, momentum, TrackFitObject::par, parfact, phi0, pt, r, sin2theta, sintheta, sphi0, theta, and z0.
Referenced by getMomentumAtTrajectoryEx(), getMomentumDerivativeAtTrajectoryEx(), getTrajectoryDerivativeEx(), getTrajectoryPointEx(), and setVertex().

Member Data Documentation

double ChargedParticleTrack::beta [mutable, protected]

momentum/energy;

Definition at line 215 of file ChargedParticleTrack.h.
Referenced by getMomentumDerivativeAtTrajectoryEx(), and updateCache().

double ChargedParticleTrack::cBq [mutable, protected]

cB * charge

Definition at line 210 of file ChargedParticleTrack.h.
Referenced by ChargedParticleTrack(), getMomentumDerivativeAtTrajectoryEx(), setParameters(), and updateCache().

double ChargedParticleTrack::charge [protected]

charge (in units of e)

Definition at line 217 of file ChargedParticleTrack.h.
Referenced by ChargedParticleTrack(), getCharge(), setParameters(), and updateCache().

double ChargedParticleTrack::cottheta [mutable, protected]

cotan (theta)

Definition at line 207 of file ChargedParticleTrack.h.
Referenced by getMomentumAtTrajectoryEx(), getMomentumDerivativeAtTrajectoryEx(), getTrajectoryDerivativeEx(), getTrajectoryPointEx(), and updateCache().

double ChargedParticleTrack::cphi0 [mutable, protected]

cos(phi0)

Definition at line 205 of file ChargedParticleTrack.h.
Referenced by getTrajectoryDerivativeEx(), getTrajectoryPointEx(), setVertex(), and updateCache().

double ChargedParticleTrack::dca [mutable, protected]

dca = parfact[3]*par[3]

Definition at line 200 of file ChargedParticleTrack.h.
Referenced by ChargedParticleTrack(), getTrajectoryDerivativeEx(), getTrajectoryPointEx(), setParameters(), setVertex(), and updateCache().

double ChargedParticleTrack::dcamir [mutable, protected]

dca - r

Definition at line 206 of file ChargedParticleTrack.h.
Referenced by getTrajectoryDerivativeEx(), getTrajectoryPointEx(), setVertex(), and updateCache().

double ChargedParticleTrack::energy [mutable, protected]

sqrt ((cB/[kappa*sin(theta)])^2 + mass^2)

Definition at line 214 of file ChargedParticleTrack.h.
Referenced by getMomentumAtTrajectoryEx(), getMomentumDerivativeAtTrajectoryEx(), and updateCache().

double ChargedParticleTrack::kappa [mutable, protected]

kappa = parfact[0]*par[0]

Definition at line 197 of file ChargedParticleTrack.h.
Referenced by ChargedParticleTrack(), getCharge(), getMomentumAtTrajectoryEx(), getMomentumDerivativeAtTrajectoryEx(), getNormalS(), getTrajectoryDerivativeEx(), getTrajectoryPointEx(), setParameters(), setVertex(), and updateCache().

double ChargedParticleTrack::mass [mutable, protected]

mass = parfact[5]*par[5]

Definition at line 202 of file ChargedParticleTrack.h.
Referenced by setParameters(), and updateCache().

double ChargedParticleTrack::momderfact [mutable, protected]

+cBq/kappa^2;

Definition at line 213 of file ChargedParticleTrack.h.
Referenced by getMomentumDerivativeAtTrajectoryEx(), and updateCache().

double ChargedParticleTrack::momentum [mutable, protected]

-cBq/[kappa*sin(theta)];

Definition at line 212 of file ChargedParticleTrack.h.
Referenced by getMomentumDerivativeAtTrajectoryEx(), and updateCache().

const double ChargedParticleTrack::parfact [static]

Initial value:
{0.0001, 0.001, 0.01, 0.01, 1., 1., 1., 1.}
Factor between internal and external parameters.

Definition at line 29 of file ChargedParticleTrack.C.
Referenced by ChargedParticleTrack(), K0Event::createSmearedChargedTrack(), getArcLength(), getMass(), getMomentumDerivativeAtTrajectoryEx(), getMomentumDerivativeEx(), getMomentumEx(), getNormalS(), getTangentialHelix(), getTrajectoryDerivativeEx(), getVertexDerivativeEx(), getVertexEx(), initCov(), setParam(), setParameters(), setVertex(), and updateCache().

double ChargedParticleTrack::phi0 [mutable, protected]

phi0 = parfact[1]*par[1]

Definition at line 198 of file ChargedParticleTrack.h.
Referenced by ChargedParticleTrack(), getMomentumAtTrajectoryEx(), getMomentumDerivativeAtTrajectoryEx(), getTrajectoryDerivativeEx(), getTrajectoryPointEx(), setParameters(), setVertex(), and updateCache().

double ChargedParticleTrack::pt [mutable, protected]

-cBq/kappa

Definition at line 211 of file ChargedParticleTrack.h.
Referenced by getMomentumAtTrajectoryEx(), getMomentumDerivativeAtTrajectoryEx(), and updateCache().

double ChargedParticleTrack::r [mutable, protected]

1/kappa

Definition at line 203 of file ChargedParticleTrack.h.
Referenced by ChargedParticleTrack(), getTrajectoryDerivativeEx(), getTrajectoryPointEx(), setParameters(), setVertex(), and updateCache().

double ChargedParticleTrack::sin2theta [mutable, protected]

sin^2 (theta)

Definition at line 209 of file ChargedParticleTrack.h.
Referenced by getMomentumDerivativeAtTrajectoryEx(), getTrajectoryDerivativeEx(), and updateCache().

double ChargedParticleTrack::sintheta [mutable, protected]

sin (theta)

Definition at line 208 of file ChargedParticleTrack.h.
Referenced by updateCache().

double ChargedParticleTrack::sphi0 [mutable, protected]

sin(phi0)

Definition at line 204 of file ChargedParticleTrack.h.
Referenced by getTrajectoryDerivativeEx(), getTrajectoryPointEx(), setVertex(), and updateCache().

double ChargedParticleTrack::theta [mutable, protected]

theta = parfact[2]*par[2]

Definition at line 199 of file ChargedParticleTrack.h.
Referenced by ChargedParticleTrack(), setParameters(), and updateCache().

double ChargedParticleTrack::z0 [mutable, protected]

z0 = parfact[4]*par[4]

Definition at line 201 of file ChargedParticleTrack.h.
Referenced by ChargedParticleTrack(), getTrajectoryPointEx(), setParameters(), and updateCache().

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

Generated on Fri Sep 14 17:38:35 2007 for Kinfit by

1.3.2

ChargedParticleTrack Class Reference

Public Member Functions

Static Public Attributes

Protected Types

Protected Member Functions

Protected Attributes

Detailed Description

Member Enumeration Documentation

Constructor & Destructor Documentation

Member Function Documentation

Member Data Documentation