The RaveVertexFitter class is part of the RaveInterface together with RaveSetup. More...

#include <RaveVertexFitter.h>

Collaboration diagram for RaveVertexFitter:

[legend]

Public Member Functions
	RaveVertexFitter ()
	The constructor.

	~RaveVertexFitter ()
	Destructor.

void	addTrack (const Particle *const aParticlePtr)
	add a track (in the format of a Belle2::Particle) to set of tracks that should be fitted to a vertex

void	addTrack (const TrackFitResult *const aTrackPtr)
	add a track (in the format of a pointer to a Belle2::TrackFitResult) to set of tracks that should be fitted to a vertex

void	addMother (const Particle *const aMotherParticlePtr)
	All daughters of the argument of this function will be used as input for the vertex fit.

int	fit (std::string options="default")
	do the vertex fit with all tracks previously added with the addTrack or addMother function. More...

B2Vector3D	getPos (VecSize vertexId=0) const
	get the position of the fitted vertex. More...

double	getPValue (VecSize vertexId=0) const
	get the p value of the fitted vertex. More...

double	getNdf (VecSize vertexId=0) const
	get the number of degrees of freedom (NDF) of the fitted vertex. More...

double	getChi2 (VecSize vertexId=0) const
	get the χ² of the fitted vertex. More...

TMatrixDSym	getCov (VecSize vertexId=0) const
	get the covariance matrix (3x3) of the of the fitted vertex position. More...

double	getWeight (int trackId, VecSize vertexId=0) const
	get the weight Rave assigned to a specific input track. More...

std::vector< int >	getTrackIdsForOneVertex (VecSize vertexId=0) const
	get the ids of the tracks Rave associated with a specific vertex. More...

void	useBeamSpot (bool beamSpot=true)
	Overwrite the global option in ReveSetup that tells the fitter if beam spot info should be used or not. More...

void	clearTracks ()
	Delete all information of previously added tracks and fitted results.

void	Print () const
	Print all attributes of this object to terminal.

int	getNTracks () const
	return the number of tracks that where added via addTrack or addMother

void	updateDaughters ()
	update the Daughters particles

Protected Member Functions
void	initBeamSpotMember ()
	Initialize m_useBeamSpot. More...

void	isVertexIdValid (const VecSize vertexId) const
	checks if the vertex the user requested via one of the getters it actually there

rave::Track	TrackFitResultToRaveTrack (const TrackFitResult *const aTrackPtr) const
	converts a track from Belle2::TrackFitResult format to rave::Track format

Protected Attributes
bool	m_useBeamSpot
	flag determines if the beam spot will be used or not. More...

std::vector< rave::Track >	m_raveTracks
	holds the tracks that were added to a RaveVertexFitter object in the format used by Rave

std::vector< rave::Vertex >	m_raveVertices
	holds the fitted vertices after fit() was called in the format used by Rave

std::vector< Particle * >	m_belleDaughters
	Belle Particle pointers input.

Private Types
typedef std::vector< int >::size_type	VecSize
	I am using std::vector<int>::size_type because it is the official return value of .size() although on normal machines a ::size_type is just an unsigned int anyway. More...

Detailed Description

The RaveVertexFitter class is part of the RaveInterface together with RaveSetup.

To fit a vertex the user adds tracks (different formats are supported). Then calls the fit() function where the name of the fitting method and parameters can be passed as a string. RaveVertexFitter provides the getters to extract the results produced by Rave.

Definition at line 36 of file RaveVertexFitter.h.

Member Typedef Documentation

◆ VecSize

typedef std::vector<int>::size_type VecSize

private

I am using std::vector<int>::size_type because it is the official return value of .size() although on normal machines a ::size_type is just an unsigned int anyway.

Because std::vector<int>::size_type is so long it is shortened to VecSize

Definition at line 38 of file RaveVertexFitter.h.

Member Function Documentation

◆ fit()

int fit ( std::string options = "default" )

do the vertex fit with all tracks previously added with the addTrack or addMother function.

The argument is a string determining the Rave fitting method. See https://rave.hepforge.org/trac/wiki/RaveMethods for the different methods The return value is the number of successfully found vertices (depending on the selected algorithm this can be more then one vertex). Return value 0 means the fit was not successful. -1 means not enough tracks were added

Definition at line 121 of file RaveVertexFitter.cc.

 {
   //B2WARNING("RaveVertexFitter::fit(string options)" );
   //B2WARNING("m_useBeamSpot " << m_useBeamSpot );
   if (options == "default") {
     options = "kalman";
   }
   int ndf = 0;
  
   ndf = 2 * m_raveTracks.size();
  
   if (m_useBeamSpot == true) {
     ndf += 3;
   }
   if (ndf < 4) {
     return -1;
   }
   int nOfVertices = -100;
  
   if (m_useBeamSpot == true) {
     const B2Vector3D& bsPos = RaveSetup::getRawInstance()->m_beamSpot;
     const TMatrixDSym& bsCov = RaveSetup::getRawInstance()->m_beamSpotCov;
     const rave::Covariance3D bsCovRave(bsCov(0, 0), bsCov(0, 1), bsCov(0, 2), bsCov(1, 1), bsCov(1, 2), bsCov(2, 2));
     RaveSetup::getRawInstance()->m_raveVertexFactory->setBeamSpot(rave::Ellipsoid3D(rave::Point3D(bsPos.X(), bsPos.Y(), bsPos.Z()),
         bsCovRave));
   }
   //B2WARNING( "now fitting with m_raveVertexFactory" );
   RaveSetup::getRawInstance()->m_raveVertexFactory->setDefaultMethod(options);
   m_raveVertices = RaveSetup::getRawInstance()->m_raveVertexFactory->create(m_raveTracks, m_useBeamSpot);
   nOfVertices = m_raveVertices.size();
  
   return nOfVertices;
 }