TrackFitResult Class Reference

Values of the result of a track fit with a given particle hypothesis. More...

#include <TrackFitResult.h>

Inheritance diagram for TrackFitResult:

Collaboration diagram for TrackFitResult:

Public Member Functions
	TrackFitResult ()
	Constructor initializing everything to zero.
	TrackFitResult (const ROOT::Math::XYZVector &position, const ROOT::Math::XYZVector &momentum, const TMatrixDSym &covariance, const short int charge, const Const::ParticleType &particleType, const float pValue, const float bField, const uint64_t hitPatternCDCInitializer, const uint32_t hitPatternVXDInitializer, const float NDF)
	Constructor initializing class with fit result.
	TrackFitResult (const std::vector< float > &tau, const std::vector< float > &cov5, const Const::ParticleType &particleType, const float pValue, const uint64_t hitPatternCDCInitializer, const uint32_t hitPatternVXDInitializer, const float NDF)
	Constructor initializing class with perigee parameters.
void	updateTrackFitResult (const TrackFitResult &input)
	update the TrackFitResults
void	mask ()
	mask this TrackFitResults by setting the pValue to nan
ROOT::Math::XYZVector	getPosition () const
	Getter for vector of position at closest approach of track in r/phi projection.
ROOT::Math::XYZVector	getMomentum () const
	Getter for vector of momentum at closest approach of track in r/phi projection.
ROOT::Math::PxPyPzEVector	get4Momentum () const
	Getter for the 4Momentum at the closest approach of the track in the r/phi projection.
double	getEnergy () const
	Getter for the Energy at the closest approach of the track in the r/phi projection.
double	getTransverseMomentum () const
	Getter for the absolute value of the transverse momentum at the perigee.
TMatrixDSym	getCovariance6 () const
	Position and Momentum Covariance Matrix.
Const::ParticleType	getParticleType () const
	Getter for ParticleType of the mass hypothesis of the track fit.
short	getChargeSign () const
	Return track charge (1 or -1).
double	getPValue () const
	Getter for Chi2 Probability of the track fit.
float	getNDF () const
	Getter for number of degrees of freedom of the track fit.
double	getChi2 () const
	Get chi2 given NDF and p-value.
double	getD0 () const
	Getter for d0.
double	getPhi0 () const
	Getter for phi0.
double	getPhi () const
	Getter for phi0 with CDF naming convention.
double	getOmega () const
	Getter for omega.
double	getZ0 () const
	Getter for z0.
double	getTanLambda () const
	Getter for tanLambda.
double	getCotTheta () const
	Getter for tanLambda with CDF naming convention.
std::vector< float >	getTau () const
	Getter for all perigee parameters.
std::vector< float >	getCov () const
	Getter for all covariance matrix elements of perigee parameters.
TMatrixDSym	getCovariance5 () const
	Getter for covariance matrix of perigee parameters in matrix form.
Helix	getHelix () const
	Conversion to framework Helix (without covariance).
Helix	getHelix (float momentumScale) const
	Conversion to framework Helix with momentum scaling (without covariance).
UncertainHelix	getUncertainHelix () const
	Conversion to framework Uncertain Helix (i.e., with covariance).
HitPatternCDC	getHitPatternCDC () const
	Getter for the hit pattern in the CDC;.
HitPatternVXD	getHitPatternVXD () const
	Getter for the hit pattern in the VXD;.
virtual std::string	getInfoHTML () const override
	Return a short summary of this object's contents in HTML format.
void	addRelationTo (const RelationsInterface< BASE > *object, float weight=1.0, const std::string &namedRelation="") const
	Add a relation from this object to another object (with caching).
void	addRelationTo (const TObject *object, float weight=1.0, const std::string &namedRelation="") const
	Add a relation from this object to another object (no caching, can be quite slow).
void	copyRelations (const RelationsInterface< BASE > *sourceObj)
	Copies all relations of sourceObj (pointing from or to sourceObj) to this object (including weights).
template<class TO >
RelationVector< TO >	getRelationsTo (const std::string &name="", const std::string &namedRelation="") const
	Get the relations that point from this object to another store array.
template<class FROM >
RelationVector< FROM >	getRelationsFrom (const std::string &name="", const std::string &namedRelation="") const
	Get the relations that point from another store array to this object.
template<class T >
RelationVector< T >	getRelationsWith (const std::string &name="", const std::string &namedRelation="") const
	Get the relations between this object and another store array.
template<class TO >
TO *	getRelatedTo (const std::string &name="", const std::string &namedRelation="") const
	Get the object to which this object has a relation.
template<class FROM >
FROM *	getRelatedFrom (const std::string &name="", const std::string &namedRelation="") const
	Get the object from which this object has a relation.
template<class T >
T *	getRelated (const std::string &name="", const std::string &namedRelation="") const
	Get the object to or from which this object has a relation.
template<class TO >
std::pair< TO *, float >	getRelatedToWithWeight (const std::string &name="", const std::string &namedRelation="") const
	Get first related object & weight of relation pointing to an array.
template<class FROM >
std::pair< FROM *, float >	getRelatedFromWithWeight (const std::string &name="", const std::string &namedRelation="") const
	Get first related object & weight of relation pointing from an array.
template<class T >
std::pair< T *, float >	getRelatedWithWeight (const std::string &name="", const std::string &namedRelation="") const
	Get first related object & weight of relation pointing from/to an array.
virtual std::string	getName () const
	Return a short name that describes this object, e.g.
std::string	getInfo () const
	Return a short summary of this object's contents in raw text format.
std::string	getArrayName () const
	Get name of array this object is stored in, or "" if not found.
int	getArrayIndex () const
	Returns this object's array index (in StoreArray), or -1 if not found.

Protected Member Functions
TClonesArray *	getArrayPointer () const
	Returns the pointer to the raw DataStore array holding this object (protected since these arrays are easy to misuse).

Private Member Functions
	ClassDefOverride (TrackFitResult, 10)
	Values of the result of a track fit with a given particle hypothesis.
	ClassDef (RelationsInterface, 0)
	defines interface for accessing relations of objects in StoreArray.

Private Attributes
unsigned int	m_pdg
	PDG Code for hypothesis with which the corresponding fit was performed.
Double32_t	m_pValue
	Chi2 Probability of the fit.
Double32_t	m_tau [c_NPars]
	perigee helix parameters; tau = d0, phi0, omega, z0, tanLambda.
Double32_t	m_cov5 [c_NCovEntries]
	The 15 = 5*(5+1)/2 covariance matrix elements.
uint64_t	m_hitPatternCDCInitializer
	Member for initializing the information about hits in the CDC.
uint32_t	m_hitPatternVXDInitializer
	Member for initializing the information about hits in the VXD.
uint16_t	m_NDF100
	Member for number of degrees of freedom multiplied by 100 in order to store inside an int a float with two significant digits.
DataStore::StoreEntry *	m_cacheDataStoreEntry
	Cache of the data store entry to which this object belongs.
int	m_cacheArrayIndex
	Cache of the index in the TClonesArray to which this object belongs.

Static Private Attributes
static const uint16_t	c_NDFFlag = 0xFFFF
	backward compatibility initialisation for NDF
TFRStorageSizes
Constants for Storage sizes
static const unsigned int	c_NPars = 5
	Number of helix parameters.
static const unsigned int	c_NCovEntries = 5 * 6 / 2
	Number of covariance entries.
TFRParName
Names for the parameter indices into m_tau.
static const unsigned int	iD0 = 0
	Index for d0.
static const unsigned int	iPhi0 = 1
	Index for phi0.
static const unsigned int	iOmega = 2
	Index for omega.
static const unsigned int	iZ0 = 3
	Index for z0.
static const unsigned int	iTanLambda = 4
	Index tan lambda.

Friends
class	PostMergeUpdaterModule

Detailed Description

Values of the result of a track fit with a given particle hypothesis.

The values are stored as perigee parameters with a corresponding covariance matrix. The used perigee parameters are: 1) d0 which is the signed distance to the perigee. Its sign is positive (negative) if the angle between the transverse momentum and d0 is +pi/2 (-pi/2) 2) phi0 which is the angle between the transverse momentum and the x axis and in [-pi, pi] 3) the signed curvature of the track where the sign is given by the charge of the particle 4) z0 which is the distance of the perigee from the origin in the r-z plane 5) tanLambda which is the inverse slope of the track in the r-z plane

These are the parameters used by BaBar, see D.N. Brown et al., The BaBar Track Fitting Algorithm, appendix A, eq. (15). Available at http://rhicii-science.bnl.gov/public/comp/reco/babar.ps

The class is able to return the track fit result as either perigee parameters or cartesian parameters (x,y,z,px,py,pz)

Definition at line 49 of file TrackFitResult.h.

Constructor & Destructor Documentation

TrackFitResult() [1/3]

TrackFitResult

(

)

Constructor initializing everything to zero.

Definition at line 22 of file TrackFitResult.cc.

                               :
  m_pdg(0), m_pValue(0),
  m_hitPatternCDCInitializer(0),
  m_hitPatternVXDInitializer(0),
  m_NDF100(c_NDFFlag)
{
  memset(m_tau, 0, sizeof(m_tau));
  memset(m_cov5, 0, sizeof(m_cov5));
}

TrackFitResult() [2/3]

TrackFitResult	(	const ROOT::Math::XYZVector &	position,
		const ROOT::Math::XYZVector &	momentum,
		const TMatrixDSym &	covariance,
		const short int	charge,
		const Const::ParticleType &	particleType,
		const float	pValue,
		const float	bField,
		const uint64_t	hitPatternCDCInitializer,
		const uint32_t	hitPatternVXDInitializer,
		const float	NDF
	)

Constructor initializing class with fit result.

This is the only way to set the values of the TrackFitResult. We don't have any setters, as we assume, that once we create the MDST object, we don't want to change the values of the tracks any more. Scaling can be applied during readout, by setting the value for the magnetic field.

Parameters

position	Position of the track near the perigee.
momentum	Momentum of the track near the perigee.
covariance	Covariance matrix for position and momentum given.
charge	Charge of the particle.
particleType	Particle Type used for mass hypothesis of the fit.
pValue	p-value of the corresponding track fit.
bField	Magnetic field to be used for the calculation of the curvature; It is assumed, that the B-field is parallel to the z-Axis.
hitPatternCDCInitializer	bits for initializing CDC hit pattern.
hitPatternVXDInitializer	bits for initializing VXD hit pattern.
NDF	number of degrees of freedom for the fit (float since DAF provides decimal weights which can be less than 1)

Definition at line 32 of file TrackFitResult.cc.

                                                :
  m_pdg(std::abs(particleType.getPDGCode())), m_pValue(pValue),
  m_hitPatternCDCInitializer(hitPatternCDCInitializer),
  m_hitPatternVXDInitializer(hitPatternVXDInitializer),
  m_NDF100(int(NDF * 100.))
{
  UncertainHelix h(position, momentum, charge, bField, covariance, pValue);
 
  m_tau[iD0] = h.getD0();
  m_tau[iPhi0] = h.getPhi0();
  m_tau[iOmega] = h.getOmega();
  m_tau[iZ0] = h.getZ0();
  m_tau[iTanLambda] = h.getTanLambda();
 
  // Upper half of the covariance matrix goes into m_cov5.
  const TMatrixDSym& cov = h.getCovariance();
  unsigned int counter = 0;
  for (unsigned int i = 0; i < c_NPars; ++i) {
    for (unsigned int j = i; j < c_NPars; ++j) {
      m_cov5[counter++] = cov(i, j);
    }
  }
  assert(counter == c_NCovEntries);
}

TrackFitResult() [3/3]

TrackFitResult	(	const std::vector< float > &	tau,
		const std::vector< float > &	cov5,
		const Const::ParticleType &	particleType,
		const float	pValue,
		const uint64_t	hitPatternCDCInitializer,
		const uint32_t	hitPatternVXDInitializer,
		const float	NDF
	)

Constructor initializing class with perigee parameters.

This constructor is needed for testing the class.

Parameters

tau	Helix parameters of the track;

See also

m_tau .

Parameters

cov5	Covariance matrix of the helix paramters of the track;

See also

m_cov5

Parameters

particleType	Particle Type used for the mass hypothesis of the fit.
pValue	p-value of the corresponding track fit.
hitPatternCDCInitializer	bits for initializing CDC hit pattern.
hitPatternVXDInitializer	bits for initializing VXD hit pattern.
NDF	number of degrees of freedom for the fit (float since DAF provides decimal weights which can be less than 1)

Definition at line 63 of file TrackFitResult.cc.

                                                :
  m_pdg(std::abs(particleType.getPDGCode())), m_pValue(pValue),
  m_hitPatternCDCInitializer(hitPatternCDCInitializer),
  m_hitPatternVXDInitializer(hitPatternVXDInitializer),
  m_NDF100(int(NDF * 100.))
{
  if (tau.size() != c_NPars
      || cov5.size() != c_NCovEntries)
    B2FATAL("Invalid initializer for TrackFitResult.");
 
  for (unsigned int i = 0; i < c_NPars; ++i)
    m_tau[i] = tau[i];
  for (unsigned int i = 0; i < c_NCovEntries; ++i)
    m_cov5[i] = cov5[i];
}

Member Function Documentation

addRelationTo() [1/2]

void addRelationTo ( const RelationsInterface< BASE > *  object, float  weight = 1.0, const std::string &  namedRelation = ""  ) const

inlineinherited

Add a relation from this object to another object (with caching).

Parameters

object	The object to which the relation should point.
weight	The weight of the relation.
namedRelation	Additional name for the relation, or "" for the default naming

Definition at line 142 of file RelationsObject.h.

    {
      if (object)
        DataStore::Instance().addRelation(this, m_cacheDataStoreEntry, m_cacheArrayIndex,
                                          object, object->m_cacheDataStoreEntry, object->m_cacheArrayIndex, weight, namedRelation);
    }

addRelationTo() [2/2]

void addRelationTo ( const TObject *  object, float  weight = 1.0, const std::string &  namedRelation = ""  ) const

inlineinherited

Add a relation from this object to another object (no caching, can be quite slow).

Parameters

object	The object to which the relation should point.
weight	The weight of the relation.
namedRelation	Additional name for the relation, or "" for the default naming

Definition at line 155 of file RelationsObject.h.

    {
      StoreEntry* toEntry = nullptr;
      int toIndex = -1;
      DataStore::Instance().addRelation(this, m_cacheDataStoreEntry, m_cacheArrayIndex, object, toEntry, toIndex, weight, namedRelation);
    }

copyRelations()

void copyRelations ( const RelationsInterface< BASE > *  sourceObj )

inlineinherited

Copies all relations of sourceObj (pointing from or to sourceObj) to this object (including weights).

Useful if you want to make a complete copy of a StoreArray object to make modifications to it, but retain all information on linked objects.

Note: this only works if sourceObj inherits from the same base (e.g. RelationsObject), and only for related objects that also inherit from the same base.

Definition at line 170 of file RelationsObject.h.

    {
      if (!sourceObj)
        return;
      auto fromRels = sourceObj->getRelationsFrom<RelationsInterface<BASE>>("ALL");
      for (unsigned int iRel = 0; iRel < fromRels.size(); iRel++) {
        fromRels.object(iRel)->addRelationTo(this, fromRels.weight(iRel));
      }
 
      auto toRels = sourceObj->getRelationsTo<RelationsInterface<BASE>>("ALL");
      for (unsigned int iRel = 0; iRel < toRels.size(); iRel++) {
        this->addRelationTo(toRels.object(iRel), toRels.weight(iRel));
      }
    }

get4Momentum()

ROOT::Math::PxPyPzEVector get4Momentum ( ) const

inline

Getter for the 4Momentum at the closest approach of the track in the r/phi projection.

P = (px, py, pz, E) where E is calculated via the momentum and the particle hypothesis of the TrackFitResult.

Definition at line 125 of file TrackFitResult.h.

    {
      const ROOT::Math::XYZVector momentum = getMomentum();
      return ROOT::Math::PxPyPzEVector(momentum.X(), momentum.Y(), momentum.Z(), getEnergy());
    }

getArrayIndex()

int getArrayIndex ( ) const

inlineinherited

Returns this object's array index (in StoreArray), or -1 if not found.

Definition at line 385 of file RelationsObject.h.

    {
      DataStore::Instance().findStoreEntry(this, m_cacheDataStoreEntry, m_cacheArrayIndex);
      return m_cacheArrayIndex;
    }

getArrayName()

std::string getArrayName ( ) const

inlineinherited

Get name of array this object is stored in, or "" if not found.

Definition at line 377 of file RelationsObject.h.

    {
      DataStore::Instance().findStoreEntry(this, m_cacheDataStoreEntry, m_cacheArrayIndex);
      return m_cacheDataStoreEntry ? m_cacheDataStoreEntry->name : "";
    }

getArrayPointer()

TClonesArray * getArrayPointer ( ) const

inlineprotectedinherited

Returns the pointer to the raw DataStore array holding this object (protected since these arrays are easy to misuse).

Definition at line 418 of file RelationsObject.h.

    {
      DataStore::Instance().findStoreEntry(this, m_cacheDataStoreEntry, m_cacheArrayIndex);
      if (!m_cacheDataStoreEntry)
        return nullptr;
      return m_cacheDataStoreEntry->getPtrAsArray();
    }

getChargeSign()

short getChargeSign ( ) const

inline

Return track charge (1 or -1).

Definition at line 161 of file TrackFitResult.h.

{ return (getOmega() > 0) - (getOmega() < 0); }

getChi2()

double getChi2

(

)

const

Get chi2 given NDF and p-value.

Definition at line 107 of file TrackFitResult.cc.

{
  double pValue = getPValue();
  float nDF    = getNDF();
  if (pValue == 0) {
    return std::numeric_limits<double>::infinity();
  }
  if (nDF <= 0) {
    return std::numeric_limits<double>::quiet_NaN();
  }
  return 2 * boost::math::gamma_q_inv(nDF / 2., pValue);
}

getCotTheta()

double getCotTheta ( ) const

inline

Getter for tanLambda with CDF naming convention.

Definition at line 210 of file TrackFitResult.h.

{ return getTanLambda(); }

getCov()

std::vector< float > getCov ( ) const

inline

Getter for all covariance matrix elements of perigee parameters.

Returns

vector with 15 elements

Definition at line 222 of file TrackFitResult.h.

{ return std::vector<float>(m_cov5, m_cov5 + c_NCovEntries); }

getCovariance5()

TMatrixDSym getCovariance5

(

)

const

Getter for covariance matrix of perigee parameters in matrix form.

The order is given by TFRParName: d0, phi0, omega, z0, lambda.

Definition at line 120 of file TrackFitResult.cc.

{
  TMatrixDSym cov5(c_NPars);
  unsigned int counter = 0;
  for (unsigned int i = 0; i < c_NPars; ++i) {
    for (unsigned int j = i; j < c_NPars; ++j) {
      cov5(i, j) = cov5(j, i) = m_cov5[counter];
      ++counter;
    }
  }
  assert(counter == c_NCovEntries);
  return cov5;
}

getCovariance6()

TMatrixDSym getCovariance6 ( ) const

inline

Position and Momentum Covariance Matrix.

Definition at line 148 of file TrackFitResult.h.

    {
      const double bField = BFieldManager::getField(getPosition()).Z() / Unit::T;
      return getUncertainHelix().getCartesianCovariance(bField);
    }

getD0()

double getD0 ( ) const

inline

Getter for d0.

This is the signed distance to the IP in the r-phi plane.

Returns

Definition at line 179 of file TrackFitResult.h.

{ return m_tau[iD0]; }

getEnergy()

double getEnergy ( ) const

inline

Getter for the Energy at the closest approach of the track in the r/phi projection.

E is calculated via the momentum and the particle hypothesis of the TrackFitResult.

Definition at line 134 of file TrackFitResult.h.

    {
      return std::sqrt(getMomentum().Mag2() + getParticleType().getMass() * getParticleType().getMass());
    }

getHelix() [1/2]

Helix getHelix ( ) const

inline

Conversion to framework Helix (without covariance).

Definition at line 231 of file TrackFitResult.h.

    { return Helix(getD0(), getPhi0(), getOmega(), getZ0(), getTanLambda()); }

getHelix() [2/2]

Helix getHelix ( float  momentumScale ) const

inline

Conversion to framework Helix with momentum scaling (without covariance).

Definition at line 235 of file TrackFitResult.h.

    { return Helix(getD0(), getPhi0(), getOmega() / momentumScale, getZ0(), getTanLambda()); }

getHitPatternCDC()

HitPatternCDC getHitPatternCDC

(

)

const

Getter for the hit pattern in the CDC;.

See also

HitPatternCDC

Definition at line 134 of file TrackFitResult.cc.

{
  return HitPatternCDC(m_hitPatternCDCInitializer);
}

getHitPatternVXD()

HitPatternVXD getHitPatternVXD

(

)

const

Getter for the hit pattern in the VXD;.

See also

HitPatternVXD

Definition at line 139 of file TrackFitResult.cc.

{
  return HitPatternVXD(m_hitPatternVXDInitializer);
}

getInfo()

std::string getInfo ( ) const

inlineinherited

Return a short summary of this object's contents in raw text format.

Returns the contents of getInfoHTML() while translating line-breaks etc.

Note

: You don't need to implement this function (it's not virtual), getInfoHTML() is enough.

Definition at line 370 of file RelationsObject.h.

    {
      return _RelationsInterfaceImpl::htmlToPlainText(getInfoHTML());
    }

getInfoHTML()

std::string getInfoHTML ( ) const

overridevirtual

Return a short summary of this object's contents in HTML format.

Reimplemented from RelationsInterface< BASE >.

Definition at line 143 of file TrackFitResult.cc.

{
  std::stringstream out;
  out << "<b>Fit Hypothesis (PDG)</b>: " << m_pdg << "<br>";
  out << "<b>nPXDHits</b>: " << getHitPatternVXD().getNPXDHits() << "<br>";
  out << "<b>nSVDHits</b>: " << getHitPatternVXD().getNSVDHits() << "<br>";
  out << "<b>nCDCHits</b>: " << getHitPatternCDC().getNHits() << "<br>";
  out << "<b>NDF</b>: " << getNDF() << "<br>";
  out << " <br>";
  out << "<b>d0</b>: " << m_tau[iD0] << " cm <br>";
  out << "<b>phi0</b>: " << m_tau[iPhi0] << " rad <br>";
  out << "<b>omega</b>: " << m_tau[iOmega] << " 1/GeV<br>";
  out << "<b>z0</b>: " << m_tau[iZ0] << " cm <br>";
  out << "<b>tanLambda</b>: " << m_tau[iTanLambda] << "<br>";
  out << " <br>";
  out << "<b>Covariance Matrix (d0, phi0, omega, z0, tanLambda)</b>: " << HTML::getString(getCovariance5()) << "<br>";
  out << "<b>pValue</b>: " << m_pValue << "<br>";
  return out.str();
}

getMomentum()

ROOT::Math::XYZVector getMomentum ( ) const

inline

Getter for vector of momentum at closest approach of track in r/phi projection.

As we calculate recalculate the momentum from a geometric helix, we need an estimate of the magnetic field along the z-axis to give back the momentum.

Definition at line 116 of file TrackFitResult.h.

    {
      const double bField = BFieldManager::getField(getPosition()).Z() / Unit::T;
      return getHelix().getMomentum(bField);
    }

getName()

virtual std::string getName ( ) const

inlinevirtualinherited

Return a short name that describes this object, e.g.

pi+ for an MCParticle.

Reimplemented in Particle, and MCParticle.

Definition at line 344 of file RelationsObject.h.

{ return ""; }

getNDF()

float getNDF

(

)

const

Getter for number of degrees of freedom of the track fit.

Definition at line 99 of file TrackFitResult.cc.

{
  if (m_NDF100 == c_NDFFlag) {
    return -1;
  }
  return (float)m_NDF100 / 100;
}

getOmega()

double getOmega ( ) const

inline

Getter for omega.

This is the curvature of the track. It's sign is defined by the charge of the particle.

Returns

Definition at line 195 of file TrackFitResult.h.

{ return m_tau[iOmega]; }

getParticleType()

Const::ParticleType getParticleType ( ) const

inline

Getter for ParticleType of the mass hypothesis of the track fit.

Definition at line 155 of file TrackFitResult.h.

{ return Const::ParticleType(m_pdg); }

getPhi()

double getPhi ( ) const

inline

Getter for phi0 with CDF naming convention.

Definition at line 188 of file TrackFitResult.h.

{ return getPhi0(); }

getPhi0()

double getPhi0 ( ) const

inline

Getter for phi0.

This is the angle of the transverse momentum in the r-phi plane.

Returns

Definition at line 185 of file TrackFitResult.h.

{ return m_tau[iPhi0]; }

getPosition()

ROOT::Math::XYZVector getPosition ( ) const

inline

Getter for vector of position at closest approach of track in r/phi projection.

Definition at line 109 of file TrackFitResult.h.

{ return getHelix().getPerigee(); }

getPValue()

double getPValue ( ) const

inline

Getter for Chi2 Probability of the track fit.

Definition at line 164 of file TrackFitResult.h.

{ return m_pValue; }

getRelated()

T * getRelated ( const std::string &  name = "", const std::string &  namedRelation = ""  ) const

inlineinherited

Get the object to or from which this object has a relation.

Template Parameters

T	The class of objects to or from which the relation points.

Parameters

name	The name of the store array to or from which the relation points. If empty the default store array name for class T will be used. If the special name "ALL" is given all store arrays containing objects of type T are considered.
namedRelation	Additional name for the relation, or "" for the default naming

Returns

The first related object or a null pointer.

Definition at line 278 of file RelationsObject.h.

    {
      return static_cast<T*>(DataStore::Instance().getRelationWith(DataStore::c_BothSides, this, m_cacheDataStoreEntry, m_cacheArrayIndex,
                             T::Class(), name, namedRelation).object);
    }

getRelatedFrom()

FROM * getRelatedFrom ( const std::string &  name = "", const std::string &  namedRelation = ""  ) const

inlineinherited

Get the object from which this object has a relation.

Template Parameters

FROM	The class of objects from which the relation points.

Parameters

name	The name of the store array from which the relation points. If empty the default store array name for class FROM will be used. If the special name "ALL" is given all store arrays containing objects of type FROM are considered.
namedRelation	Additional name for the relation, or "" for the default naming

Returns

The first related object or a null pointer.

Definition at line 263 of file RelationsObject.h.

    {
      return static_cast<FROM*>(DataStore::Instance().getRelationWith(DataStore::c_FromSide, this, m_cacheDataStoreEntry,
                                m_cacheArrayIndex, FROM::Class(), name, namedRelation).object);
    }

getRelatedFromWithWeight()

std::pair< FROM *, float > getRelatedFromWithWeight ( const std::string &  name = "", const std::string &  namedRelation = ""  ) const

inlineinherited

Get first related object & weight of relation pointing from an array.

Template Parameters

FROM	The class of objects from which the relation points.

Parameters

name	The name of the store array from which the relation points. If empty the default store array name for class FROM will be used. If the special name "ALL" is given all store arrays containing objects of type FROM are considered.
namedRelation	Additional name for the relation, or "" for the default naming

Returns

Pair of first related object and the relation weight, or (NULL, 1.0) if none found.

Definition at line 314 of file RelationsObject.h.

    {
      RelationEntry entry = DataStore::Instance().getRelationWith(DataStore::c_FromSide, this, m_cacheDataStoreEntry, m_cacheArrayIndex,
                                                                  FROM::Class(), name, namedRelation);
      return std::make_pair(static_cast<FROM*>(entry.object), entry.weight);
    }

getRelatedTo()

TO * getRelatedTo ( const std::string &  name = "", const std::string &  namedRelation = ""  ) const

inlineinherited

Get the object to which this object has a relation.

Template Parameters

TO	The class of objects to which the relation points.

Parameters

name	The name of the store array to which the relation points. If empty the default store array name for class TO will be used. If the special name "ALL" is given all store arrays containing objects of type TO are considered.
namedRelation	Additional name for the relation, or "" for the default naming

Returns

The first related object or a null pointer.

Definition at line 248 of file RelationsObject.h.

    {
      return static_cast<TO*>(DataStore::Instance().getRelationWith(DataStore::c_ToSide, this, m_cacheDataStoreEntry, m_cacheArrayIndex,
                              TO::Class(), name, namedRelation).object);
    }

getRelatedToWithWeight()

std::pair< TO *, float > getRelatedToWithWeight ( const std::string &  name = "", const std::string &  namedRelation = ""  ) const

inlineinherited

Get first related object & weight of relation pointing to an array.

Template Parameters

TO	The class of objects to which the relation points.

Parameters

name	The name of the store array to which the relation points. If empty the default store array name for class TO will be used. If the special name "ALL" is given all store arrays containing objects of type TO are considered.
namedRelation	Additional name for the relation, or "" for the default naming

Returns

Pair of first related object and the relation weight, or (NULL, 1.0) if none found.

Definition at line 297 of file RelationsObject.h.

    {
      RelationEntry entry = DataStore::Instance().getRelationWith(DataStore::c_ToSide, this, m_cacheDataStoreEntry, m_cacheArrayIndex,
                                                                  TO::Class(), name, namedRelation);
      return std::make_pair(static_cast<TO*>(entry.object), entry.weight);
    }

getRelatedWithWeight()

std::pair< T *, float > getRelatedWithWeight ( const std::string &  name = "", const std::string &  namedRelation = ""  ) const

inlineinherited

Get first related object & weight of relation pointing from/to an array.

Template Parameters

T	The class of objects to or from which the relation points.

Parameters

name	The name of the store array to or from which the relation points. If empty the default store array name for class T will be used. If the special name "ALL" is given all store arrays containing objects of type T are considered.
namedRelation	Additional name for the relation, or "" for the default naming

Returns

Pair of first related object and the relation weight, or (NULL, 1.0) if none found.

Definition at line 331 of file RelationsObject.h.

    {
      RelationEntry entry = DataStore::Instance().getRelationWith(DataStore::c_BothSides, this, m_cacheDataStoreEntry, m_cacheArrayIndex,
                                                                  T::Class(), name, namedRelation);
      return std::make_pair(static_cast<T*>(entry.object), entry.weight);
    }

getRelationsFrom()

RelationVector< FROM > getRelationsFrom ( const std::string &  name = "", const std::string &  namedRelation = ""  ) const

inlineinherited

Get the relations that point from another store array to this object.

Template Parameters

FROM	The class of objects from which the relations point.

Parameters

name	The name of the store array from which the relations point. If empty the default store array name for class FROM will be used. If the special name "ALL" is given all store arrays containing objects of type FROM are considered.
namedRelation	Additional name for the relation, or "" for the default naming

Returns

A vector of relations.

Definition at line 212 of file RelationsObject.h.

    {
      return RelationVector<FROM>(DataStore::Instance().getRelationsWith(DataStore::c_FromSide, this, m_cacheDataStoreEntry,
                                  m_cacheArrayIndex, FROM::Class(), name, namedRelation));
    }

getRelationsTo()

RelationVector< TO > getRelationsTo ( const std::string &  name = "", const std::string &  namedRelation = ""  ) const

inlineinherited

Get the relations that point from this object to another store array.

Template Parameters

TO	The class of objects to which the relations point.

Parameters

name	The name of the store array to which the relations point. If empty the default store array name for class TO will be used. If the special name "ALL" is given all store arrays containing objects of type TO are considered.
namedRelation	Additional name for the relation, or "" for the default naming

Returns

A vector of relations.

Definition at line 197 of file RelationsObject.h.

    {
      return RelationVector<TO>(DataStore::Instance().getRelationsWith(DataStore::c_ToSide, this, m_cacheDataStoreEntry,
                                m_cacheArrayIndex, TO::Class(), name, namedRelation));
    }

getRelationsWith()

RelationVector< T > getRelationsWith ( const std::string &  name = "", const std::string &  namedRelation = ""  ) const

inlineinherited

Get the relations between this object and another store array.

Relations in both directions are returned.

Template Parameters

T	The class of objects to or from which the relations point.

Parameters

name	The name of the store array to or from which the relations point. If empty the default store array name for class T will be used. If the special name "ALL" is given all store arrays containing objects of type T are considered.
namedRelation	Additional name for the relation, or "" for the default naming

Returns

A vector of relations.

Definition at line 230 of file RelationsObject.h.

    {
      return RelationVector<T>(DataStore::Instance().getRelationsWith(DataStore::c_BothSides, this, m_cacheDataStoreEntry,
                               m_cacheArrayIndex, T::Class(), name, namedRelation));
    }

getTanLambda()

double getTanLambda ( ) const

inline

Getter for tanLambda.

This is the slope of the track in the r-z plane.

Returns

Definition at line 207 of file TrackFitResult.h.

{ return m_tau[iTanLambda]; }

getTau()

std::vector< float > getTau ( ) const

inline

Getter for all perigee parameters.

Returns

vector with 5 elements

Definition at line 216 of file TrackFitResult.h.

{ return std::vector<float>(m_tau, m_tau + c_NPars); }

getTransverseMomentum()

double getTransverseMomentum ( ) const

inline

Getter for the absolute value of the transverse momentum at the perigee.

Definition at line 141 of file TrackFitResult.h.

    {
      const double bField = BFieldManager::getField(getPosition()).Z() / Unit::T;
      return getHelix().getTransverseMomentum(bField);
    }

getUncertainHelix()

UncertainHelix getUncertainHelix ( ) const

inline

Conversion to framework Uncertain Helix (i.e., with covariance).

Definition at line 239 of file TrackFitResult.h.

    {
      return UncertainHelix(getD0(), getPhi0(), getOmega(), getZ0(),
                            getTanLambda(), getCovariance5(), getPValue());
    }

getZ0()

double getZ0 ( ) const

inline

Getter for z0.

This is the z coordinate of the perigee.

Returns

Definition at line 201 of file TrackFitResult.h.

{ return m_tau[iZ0]; }

mask()

void mask ( )

inline

mask this TrackFitResults by setting the pValue to nan

Definition at line 106 of file TrackFitResult.h.

{m_pValue = NAN;}

updateTrackFitResult()

void updateTrackFitResult

(

const TrackFitResult &

input

)

update the TrackFitResults

Parameters

input

the TrackFitResult that will be copied into this TrackFitResult

Definition at line 83 of file TrackFitResult.cc.

{
  // skip self-assigns
  if (this == &input) return;
  m_pdg = input.m_pdg;
  m_pValue = input.m_pValue;
  m_NDF100 = input.m_NDF100;
  m_hitPatternCDCInitializer = input.m_hitPatternCDCInitializer;
  m_hitPatternVXDInitializer = input.m_hitPatternVXDInitializer;
 
  std::copy(std::begin(input.m_tau), std::end(input.m_tau), std::begin(this->m_tau));
 
  std::copy(std::begin(input.m_cov5), std::end(input.m_cov5), std::begin(this->m_cov5));
 
}

Friends And Related Function Documentation

PostMergeUpdaterModule

friend class PostMergeUpdaterModule

friend

Definition at line 328 of file TrackFitResult.h.

Member Data Documentation

c_NCovEntries

const unsigned int c_NCovEntries = 5 * 6 / 2

staticprivate

Number of covariance entries.

Definition at line 270 of file TrackFitResult.h.

c_NDFFlag

const uint16_t c_NDFFlag = 0xFFFF

staticprivate

backward compatibility initialisation for NDF

Definition at line 304 of file TrackFitResult.h.

c_NPars

const unsigned int c_NPars = 5

staticprivate

Number of helix parameters.

A helix has five parameters and the covariance matrix is a symmetric five-by-five matrix.

Definition at line 269 of file TrackFitResult.h.

iD0

const unsigned int iD0 = 0

staticprivate

Index for d0.

Definition at line 276 of file TrackFitResult.h.

iOmega

const unsigned int iOmega = 2

staticprivate

Index for omega.

Definition at line 278 of file TrackFitResult.h.

iPhi0

const unsigned int iPhi0 = 1

staticprivate

Index for phi0.

Definition at line 277 of file TrackFitResult.h.

iTanLambda

const unsigned int iTanLambda = 4

staticprivate

Index tan lambda.

Definition at line 280 of file TrackFitResult.h.

iZ0

const unsigned int iZ0 = 3

staticprivate

Index for z0.

Definition at line 279 of file TrackFitResult.h.

m_cacheArrayIndex

int m_cacheArrayIndex

mutableprivateinherited

Cache of the index in the TClonesArray to which this object belongs.

Definition at line 432 of file RelationsObject.h.

m_cacheDataStoreEntry

DataStore::StoreEntry* m_cacheDataStoreEntry

mutableprivateinherited

Cache of the data store entry to which this object belongs.

Definition at line 429 of file RelationsObject.h.

m_cov5

Double32_t m_cov5[c_NCovEntries]

private

The 15 = 5*(5+1)/2 covariance matrix elements.

(0,0), (0,1) ... (1,1), (1,2) ... (2,2) ...

Definition at line 290 of file TrackFitResult.h.

m_hitPatternCDCInitializer

uint64_t m_hitPatternCDCInitializer

private

Member for initializing the information about hits in the CDC.

See also

HitPatternCDC

Definition at line 296 of file TrackFitResult.h.

m_hitPatternVXDInitializer

uint32_t m_hitPatternVXDInitializer

private

Member for initializing the information about hits in the VXD.

See also

HitPatternVXD

Definition at line 301 of file TrackFitResult.h.

m_NDF100

uint16_t m_NDF100

private

Member for number of degrees of freedom multiplied by 100 in order to store inside an int a float with two significant digits.

Definition at line 309 of file TrackFitResult.h.

m_pdg

unsigned int m_pdg

private

PDG Code for hypothesis with which the corresponding fit was performed.

---

Definition at line 259 of file TrackFitResult.h.

m_pValue

Double32_t m_pValue

private

Chi2 Probability of the fit.

Definition at line 262 of file TrackFitResult.h.

m_tau

Double32_t m_tau[c_NPars]

private

perigee helix parameters; tau = d0, phi0, omega, z0, tanLambda.

Definition at line 284 of file TrackFitResult.h.

---

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

• mdst/dataobjects/include/TrackFitResult.h
• mdst/dataobjects/src/TrackFitResult.cc