BilliorVertexer (HPS Java 4.3-SNAPSHOT API)

java.lang.Object
- org.hps.recon.vertexing.BilliorVertexer

```
public class BilliorVertexer
extends Object
```
Version:

$Id: BilliorVertexer.java,v 1.3 2013/03/13 19:24:20 mgraham Exp $, Vertex tracks using least-squares method laid out by billior etal used in the HPS Java package.

Field Summary

Fields
Modifier and Type	Field and Description
`private double[]`	`_beamPosition`
`private double[]`	`_beamSize`
`private boolean`	`_beamspotConstraint`
`private double`	`_bField`
`private double`	`_chiSq`
`private String`	`_constraintType`
`private Matrix`	`_covVtx`
`private boolean`	`_debug`
`private int`	`_ntracks`
`private List<Matrix>`	`_pFit`
`private double[]`	`_referencePosition`
`private boolean`	`_targetConstraint`
`private double[]`	`_v0`
`private Matrix`	`_vertexPosition`
`private Matrix[][]`	`covMomList`
`private List<Matrix>`	`covVtxMomList`
`private boolean`	`storeCovTrkMomList`

Constructor Summary

Constructors
Constructor and Description

BilliorVertexer(double bField)

BilliorVertexer(double bField, boolean bsConst, boolean constToBS)

Constructors
Constructor and Description
`BilliorVertexer(double bField)`
`BilliorVertexer(double bField, boolean bsConst, boolean constToBS)`

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method and Description
`private void`	`applyBSconstraint(boolean pointback)`
`private void`	`debugMomentumUncertainty(int index)`
`void`	`doBeamSpotConstraint(boolean bsconst)`
`void`	`doTargetConstraint(boolean tconst)`
`BilliorVertex`	`fitVertex(List<BilliorTrack> tracks)`
`private void`	`follow1985Paper(List<BilliorTrack> tracks)`
`double`	`getChiSq()`
`double[]`	`getFittedMomentum(int index)`
`Matrix`	`getFittedMomentumCovariance(int index)`
`BasicMatrix`	`getFittedTrackCovariance(int index)`
`double[]`	`getFittedTrackParameters(int index)`
`Matrix`	`getFittedTrk1Trk2MomCovariance(int ind1, int ind2)`
`Matrix`	`getFittedVertexCovariance()`
`double`	`getInvMass()`
`double`	`getInvMassUncertainty()`
`private Matrix`	`getJacobianThetaPhiRhoToPxPyPz(double theta, double phiv, double rho)`
`Hep3Vector`	`getV0Momentum()`
`Hep3Vector`	`getV0MomentumError()`
`double[]`	`getV0Projection()`
`double[]`	`getV0ProjectionError()`
`Hep3Vector`	`getVertexPositionErrors()`
`private BasicMatrix`	`makeHk(double Vx, double pxtot, double pytot, double pztot, boolean bscon)`
`private BasicMatrix`	`makeHkFixed(double Vx, double pxtot, double pytot, double pztot, boolean bscon)`
`private BasicMatrix`	`makeRk(double Vx, double Vy, double Vz, double pxtot, double pytot, double pztot, boolean bscon)`
`void`	`setBeamPosition(double[] bp)`
`void`	`setBeamSize(double[] bs)`
`void`	`setDebug(boolean debug)`
`void`	`setReferencePosition(double[] rp)`
`void`	`setStoreCovTrkMomList(boolean value)`
`String`	`toString()`

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

storeCovTrkMomList
```
private boolean storeCovTrkMomList
```

_debug
```
private boolean _debug
```

_bField
```
private final double _bField
```

_beamspotConstraint
```
private boolean _beamspotConstraint
```

_targetConstraint
```
private boolean _targetConstraint
```

_constraintType
```
private String _constraintType
```

_beamSize
```
private final double[] _beamSize
```

_beamPosition
```
private final double[] _beamPosition
```

_referencePosition

private final double[] _referencePosition

_ntracks
```
private int _ntracks
```

_v0
```
private double[] _v0
```

_vertexPosition
```
private Matrix _vertexPosition
```

_covVtx
```
private Matrix _covVtx
```

_pFit
```
private List<Matrix> _pFit
```

covVtxMomList
```
private List<Matrix> covVtxMomList
```

covMomList
```
private Matrix[][] covMomList
```

_chiSq
```
private double _chiSq
```

Constructor Detail

BilliorVertexer
```
public BilliorVertexer(double bField)
```

BilliorVertexer

public BilliorVertexer(double bField,
                       boolean bsConst,
                       boolean constToBS)

Method Detail

setStoreCovTrkMomList

public void setStoreCovTrkMomList(boolean value)

setDebug
```
public void setDebug(boolean debug)
```

fitVertex

public BilliorVertex fitVertex(List<BilliorTrack> tracks)

applyBSconstraint

private void applyBSconstraint(boolean pointback)

makeHk

private BasicMatrix makeHk(double Vx,
                           double pxtot,
                           double pytot,
                           double pztot,
                           boolean bscon)

makeHkFixed

private BasicMatrix makeHkFixed(double Vx,
                                double pxtot,
                                double pytot,
                                double pztot,
                                boolean bscon)

makeRk

private BasicMatrix makeRk(double Vx,
                           double Vy,
                           double Vz,
                           double pxtot,
                           double pytot,
                           double pztot,
                           boolean bscon)

setBeamSize
```
public void setBeamSize(double[] bs)
```

setBeamPosition

public void setBeamPosition(double[] bp)

setReferencePosition

public void setReferencePosition(double[] rp)

doBeamSpotConstraint

public void doBeamSpotConstraint(boolean bsconst)

doTargetConstraint

public void doTargetConstraint(boolean tconst)

getChiSq
```
public double getChiSq()
```

getFittedMomentum

public double[] getFittedMomentum(int index)

debugMomentumUncertainty

private void debugMomentumUncertainty(int index)

getFittedTrackParameters

public double[] getFittedTrackParameters(int index)

getFittedTrackCovariance

public BasicMatrix getFittedTrackCovariance(int index)

getFittedMomentumCovariance

public Matrix getFittedMomentumCovariance(int index)

getFittedTrk1Trk2MomCovariance

public Matrix getFittedTrk1Trk2MomCovariance(int ind1,
                                             int ind2)

getFittedVertexCovariance

public Matrix getFittedVertexCovariance()

getVertexPositionErrors

public Hep3Vector getVertexPositionErrors()

getInvMass
```
public double getInvMass()
```

getInvMassUncertainty
```
public double getInvMassUncertainty()
```

getV0Momentum
```
public Hep3Vector getV0Momentum()
```

getV0MomentumError

public Hep3Vector getV0MomentumError()

getV0Projection
```
public double[] getV0Projection()
```

getV0ProjectionError

public double[] getV0ProjectionError()

toString
```
public String toString()
```
Overrides:

toString in class Object

follow1985Paper

private void follow1985Paper(List<BilliorTrack> tracks)

getJacobianThetaPhiRhoToPxPyPz

private Matrix getJacobianThetaPhiRhoToPxPyPz(double theta,
                                              double phiv,
                                              double rho)

Class BilliorVertexer

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

storeCovTrkMomList

_debug

_bField

_beamspotConstraint

_targetConstraint

_constraintType

_beamSize

_beamPosition

_referencePosition

_ntracks

_v0

_vertexPosition

_covVtx

_pFit

covVtxMomList

covMomList

_chiSq

Constructor Detail

BilliorVertexer

BilliorVertexer

Method Detail

setStoreCovTrkMomList

setDebug

fitVertex

applyBSconstraint

makeHk

makeHkFixed

makeRk

setBeamSize

setBeamPosition

setReferencePosition

doBeamSpotConstraint

doTargetConstraint

getChiSq

getFittedMomentum

debugMomentumUncertainty

getFittedTrackParameters

getFittedTrackCovariance

getFittedMomentumCovariance

getFittedTrk1Trk2MomCovariance

getFittedVertexCovariance

getVertexPositionErrors

getInvMass

getInvMassUncertainty

getV0Momentum

getV0MomentumError

getV0Projection

getV0ProjectionError

toString

follow1985Paper

getJacobianThetaPhiRhoToPxPyPz