Trk::TrackToVertexIPEstimator Class Reference

A class estimating the transverse impact parameter d0 and its error of a given track wrt to the reconstructed vertex. More...

#include <TrackToVertexIPEstimator.h>

Inheritance diagram for Trk::TrackToVertexIPEstimator:

Collaboration diagram for Trk::TrackToVertexIPEstimator:

Public Member Functions
virtual StatusCode	initialize () override
	Default Athena interface methods.
	TrackToVertexIPEstimator (const std::string &t, const std::string &n, const IInterface *p)
	Default Athena interface constructor and destructor.
	~TrackToVertexIPEstimator ()
virtual std::unique_ptr< ImpactParametersAndSigma >	estimate (const EventContext &ctx, const xAOD::TrackParticle *track, const xAOD::Vertex *vtx, bool doRemoval) const override
	Estimate methods returning a d0 and its calculated sigma.
virtual std::unique_ptr< ImpactParametersAndSigma >	estimate (const EventContext &ctx, const TrackParameters *track, const xAOD::Vertex *vtx, bool doRemoval) const override
virtual std::unique_ptr< ImpactParametersAndSigma >	estimate (const EventContext &ctx, const xAOD::TrackParticle *track, const xAOD::TrackParticle *newtrack, const xAOD::Vertex *vtx, bool doRemoval) const override
virtual std::unique_ptr< ImpactParametersAndSigma >	estimate (const EventContext &ctx, const TrackParameters *track, const TrackParameters *newtrack, const xAOD::Vertex *vtx, bool doRemoval) const override
virtual xAOD::Vertex *	getUnbiasedVertex (const xAOD::TrackParticle *track, const xAOD::Vertex *vtx) const override
virtual xAOD::Vertex *	getUnbiasedVertex (const TrackParameters *track, const xAOD::Vertex *vtx) const override
virtual std::unique_ptr< ImpactParametersAndSigma >	estimate (const EventContext &ctx, const xAOD::TrackParticle *track, const xAOD::Vertex *vtx) const override
virtual std::unique_ptr< ImpactParametersAndSigma >	estimate (const EventContext &ctx, const TrackParameters *track, const xAOD::Vertex *vtx) const override
virtual double	get3DLifetimeSignOfTrack (const EventContext &ctx, const TrackParameters &track, const Amg::Vector3D &jetDirection, const xAOD::Vertex &primaryVertex) const override
virtual double	get2DLifetimeSignOfTrack (const EventContext &ctx, const TrackParameters &track, const Amg::Vector3D &jetDirection, const xAOD::Vertex &primaryVertex) const override
virtual double	getZLifetimeSignOfTrack (const EventContext &ctx, const TrackParameters &track, const Amg::Vector3D &jetDirection, const xAOD::Vertex &primaryVertex) const override

Private Member Functions
std::unique_ptr< ImpactParametersAndSigma >	calculate (const EventContext &ctx, const TrackParameters *track, const xAOD::Vertex &vtx) const
	A method calculating the do and its error.

Private Attributes
ToolHandle< Trk::IExtrapolator >	m_extrapolator
ToolHandle< Trk::IVertexUpdator >	m_Updator
ToolHandle< Trk::IVertexLinearizedTrackFactory >	m_linFactory

Detailed Description

A class estimating the transverse impact parameter d0 and its error of a given track wrt to the reconstructed vertex.

Algorithm:

(a) Provided track or track particle are checked, whether they do already belong to the vertex. (b) In the positive case, the vertex is reduced by removing the track or track particle in question. (c) The trajectory state is extrapolated to the perigee with the vertex in question, the d0 and its error is estimated. The error on the vertex position is included in this calculation.

Kiril.nosp@m.l.Pr.nosp@m.okofi.nosp@m.ev@c.nosp@m.ern.c.nosp@m.h February 2008

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Changes:

Giaci.nosp@m.nto..nosp@m.Piacq.nosp@m.uadi.nosp@m.o@phy.nosp@m.sik..nosp@m.uni-f.nosp@m.reib.nosp@m.urg.d.nosp@m.e (update of 11.September 2008)

In addition the tool is now able to provide the impact parameter z0 and its error.

At the same time an option can be passed not to remove the track from the vertex (non-default)

In addition, the lifetime sign of the Impact Parameter given a lifetime direction of flight is also provided with 3 methods: 2D, Z and full 3D.

---

Johanna Fleckner (03.12.2009) allow for estimation of IP parameter even if vertex doesn't contain any tracks as can happen in BeamSpot or early running when PV is not reconstructed degrade some INFO/WARNINGS to DEBUG

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David Shope david.nosp@m..ric.nosp@m.hard..nosp@m.shop.nosp@m.e@cer.nosp@m.n.ch (2016-04-19) EDM Migration to xAOD - Remove methods involving Trk::VxCandidate and Trk::RecVertex

Definition at line 70 of file TrackToVertexIPEstimator.h.

Constructor & Destructor Documentation

TrackToVertexIPEstimator()

Trk::TrackToVertexIPEstimator::TrackToVertexIPEstimator	(	const std::string &	t,
		const std::string &	n,
		const IInterface *	p )

Default Athena interface constructor and destructor.

Definition at line 19 of file TrackToVertexIPEstimator.cxx.

                                                                                                               :
  base_class(t,n,p)
 {
 }

~TrackToVertexIPEstimator()

Trk::TrackToVertexIPEstimator::~TrackToVertexIPEstimator ( )

default

Member Function Documentation

calculate()

std::unique_ptr< ImpactParametersAndSigma > Trk::TrackToVertexIPEstimator::calculate ( const EventContext & ctx, const TrackParameters * track, const xAOD::Vertex & vtx ) const

private

A method calculating the do and its error.

At this stage the trajectory is removed from the vertex.

Definition at line 129 of file TrackToVertexIPEstimator.cxx.

 {
  //estimating the d0 and its significance by propagating the trajectory state towards
  //the vertex position. By this time the vertex should NOT contain this trajectory anymore
 
  //estrapolating to the  perigee of the reconstructed vertex
  const Amg::Vector3D & lp = vtx.position();
  PerigeeSurface perigeeSurface(lp);
  const Trk::Perigee* extrapolatedParameters =
    dynamic_cast<const Trk::Perigee*>(
      m_extrapolator
        ->extrapolate(ctx, *track, perigeeSurface)
        .release());
  if (extrapolatedParameters && extrapolatedParameters->covariance()) {
 
    //actual calculation of d0 and sigma.
    const AmgVector(5) & par = extrapolatedParameters->parameters();
    const double d0  = par[Trk::d0];
    const double z0  = par[Trk::z0];
    const double phi = par[Trk::phi];
    const double theta = par[Trk::theta];
 
    AmgSymMatrix(2) vrtXYCov = vtx.covariancePosition().block<2,2>(0,0);
 
    const AmgSymMatrix(5) & perigeeCov = *(extrapolatedParameters->covariance());
    //   std::cout<<"Perigee covariance: "<<perigeeCov<<std::endl;
 
    //d0phi->cartesian Jacobian
    Amg::Vector2D d0JacXY(-sin(phi), cos(phi));
 
 
    auto newIPandSigma=std::make_unique<ImpactParametersAndSigma>();
    newIPandSigma->IPd0=d0;
    double d0_PVcontrib=d0JacXY.transpose()*(vrtXYCov*d0JacXY);
    if (d0_PVcontrib>=0)
    {
      newIPandSigma->sigmad0=sqrt(d0_PVcontrib+perigeeCov(Trk::d0,Trk::d0));
      newIPandSigma->PVsigmad0=sqrt(d0_PVcontrib);
    }
    else
    {
      msg(MSG::WARNING) << " The contribution to d0_err: " << d0_PVcontrib << " from PV is negative: critical error in PV error matrix! Removing contribution from PV ... "  << endmsg;
      newIPandSigma->sigmad0=sqrt(perigeeCov(Trk::d0,Trk::d0));
      newIPandSigma->PVsigmad0=0;
    }
 
    AmgSymMatrix(2) covPerigeeZ0Theta;
   covPerigeeZ0Theta(0,0)=perigeeCov(Trk::z0,Trk::z0);
   covPerigeeZ0Theta(0,1)=perigeeCov(Trk::z0,Trk::theta);
   covPerigeeZ0Theta(1,0)=perigeeCov(Trk::theta,Trk::z0);
   covPerigeeZ0Theta(1,1)=perigeeCov(Trk::theta,Trk::theta);
 
   double vrtZZCov = vtx.covariancePosition()(Trk::z,Trk::z);
 
   Amg::Vector2D IPz0JacZ0Theta (sin(theta), z0*cos(theta));
   if (vrtZZCov>=0)
   {
     newIPandSigma->IPz0SinTheta=z0*sin(theta);
     newIPandSigma->sigmaz0SinTheta=
         sqrt(IPz0JacZ0Theta.transpose()*(covPerigeeZ0Theta*IPz0JacZ0Theta)+sin(theta)*vrtZZCov*sin(theta));
     newIPandSigma->PVsigmaz0SinTheta=sqrt(sin(theta)*vrtZZCov*sin(theta));
     newIPandSigma->IPz0 = z0;
     newIPandSigma->sigmaz0 = std::sqrt( vrtZZCov + perigeeCov(Trk::z0,Trk::z0) );
     newIPandSigma->PVsigmaz0 = std::sqrt( vrtZZCov );
   }
   else
   {
     ATH_MSG_WARNING(" The contribution to z0_err: " << vrtZZCov << " from PV is negative: critical error in PV error matrix! Removing contribution from PV ... ");
     newIPandSigma->IPz0SinTheta=z0*sin(theta);
     double temp = (IPz0JacZ0Theta.transpose()*(covPerigeeZ0Theta*IPz0JacZ0Theta));
     newIPandSigma->sigmaz0SinTheta=sqrt(temp);
     newIPandSigma->PVsigmaz0SinTheta=0;
 
     newIPandSigma->IPz0 = z0;
     newIPandSigma->sigmaz0 = std::sqrt( perigeeCov(Trk::z0,Trk::z0) );
     newIPandSigma->PVsigmaz0 = 0;
   }
 
 
   delete extrapolatedParameters;
   return newIPandSigma;
  }
    ATH_MSG_DEBUG ("Cannot extrapolate the trajectory state. Returning null. ");
    return nullptr;
  //end of successfull extrapolation check
 }//end of actual calculation method

estimate() [1/6]

std::unique_ptr< ImpactParametersAndSigma > Trk::TrackToVertexIPEstimator::estimate ( const EventContext & ctx, const TrackParameters * track, const TrackParameters * newtrack, const xAOD::Vertex * vtx, bool doRemoval ) const

overridevirtual

Definition at line 95 of file TrackToVertexIPEstimator.cxx.

 {
 
   if (vtx==nullptr)
   {
     ATH_MSG_WARNING("Vertex is zero pointer. Will not estimate IP of track.");
     return nullptr;
   }
 
   const xAOD::Vertex *newVertex = vtx;
   if (doRemoval)
   {
     newVertex = getUnbiasedVertex(track,vtx);
     if (newVertex == nullptr) {
       ATH_MSG_WARNING("Unbiasing of vertex failed. Will not estimate IP of track.");
       return nullptr;
     }
   }
 
   std::unique_ptr<ImpactParametersAndSigma>  IPandSigma=calculate(ctx, newtrack,*newVertex);
 
   if (doRemoval)
   {
     delete newVertex;
     newVertex=nullptr;
   }
 
   return IPandSigma;
 
 }//end of parameterBase estimate method

estimate() [2/6]

std::unique_ptr< ImpactParametersAndSigma > Trk::TrackToVertexIPEstimator::estimate ( const EventContext & ctx, const TrackParameters * track, const xAOD::Vertex * vtx ) const

overridevirtual

Definition at line 399 of file TrackToVertexIPEstimator.cxx.

 {
 
   if(track && vtx ){
     return calculate(ctx, track , *vtx);
   }
   return nullptr;
 
 }

estimate() [3/6]

std::unique_ptr< ImpactParametersAndSigma > Trk::TrackToVertexIPEstimator::estimate ( const EventContext & ctx, const TrackParameters * track, const xAOD::Vertex * vtx, bool doRemoval ) const

overridevirtual

Definition at line 82 of file TrackToVertexIPEstimator.cxx.

 {
   if(track && vtx){
     return estimate(ctx, track,track,vtx,doRemoval);
   }
   ATH_MSG_INFO( "Empty TrackParticle or Vertex pointer passed. Returning zero " );
   return nullptr;
   //end of track particle validity check
 
 }//end of parameterBase estimate method

estimate() [4/6]

std::unique_ptr< ImpactParametersAndSigma > Trk::TrackToVertexIPEstimator::estimate ( const EventContext & ctx, const xAOD::TrackParticle * track, const xAOD::TrackParticle * newtrack, const xAOD::Vertex * vtx, bool doRemoval ) const

overridevirtual

Definition at line 68 of file TrackToVertexIPEstimator.cxx.

 {
  if(track && vtx)
  {
    return estimate(ctx, &(track->perigeeParameters()),&(newtrack->perigeeParameters()),vtx,doRemoval);
  }
   ATH_MSG_INFO( "Empty TrackParticle or Vertex pointer passed. Returning zero " );
   return nullptr;
  //end of track particle validity check
 }//end of method using track particles

estimate() [5/6]

std::unique_ptr< ImpactParametersAndSigma > Trk::TrackToVertexIPEstimator::estimate ( const EventContext & ctx, const xAOD::TrackParticle * track, const xAOD::Vertex * vtx ) const

overridevirtual

Definition at line 387 of file TrackToVertexIPEstimator.cxx.

 {
 
   if(track && vtx ){
     return estimate(ctx, &(track->perigeeParameters()), vtx);
   }
   return nullptr;
 
 }

estimate() [6/6]

std::unique_ptr< ImpactParametersAndSigma > Trk::TrackToVertexIPEstimator::estimate ( const EventContext & ctx, const xAOD::TrackParticle * track, const xAOD::Vertex * vtx, bool doRemoval ) const

overridevirtual

Estimate methods returning a d0 and its calculated sigma.

All methods do check whether a track is actually fitted to a vertex

Definition at line 57 of file TrackToVertexIPEstimator.cxx.

 {
  if(track && vtx)
  {
   return estimate(ctx, &(track->perigeeParameters()),&(track->perigeeParameters()),vtx,doRemoval);
  }
  ATH_MSG_INFO( "Empty TrackParticle or Vertex pointer passed. Returning zero " );
  return nullptr;
  //end of track particle validity check
 }//end of method using track particles

get2DLifetimeSignOfTrack()

double Trk::TrackToVertexIPEstimator::get2DLifetimeSignOfTrack ( const EventContext & ctx, const TrackParameters & track, const Amg::Vector3D & jetDirection, const xAOD::Vertex & primaryVertex ) const

overridevirtual

Definition at line 240 of file TrackToVertexIPEstimator.cxx.

  {
    const Amg::Vector3D & lp = primaryVertex.position();
    PerigeeSurface perigeeSurface(lp);
 
    std::unique_ptr<const Trk::TrackParameters> extrapolatedParameters =
      m_extrapolator->extrapolate(
        ctx, track, perigeeSurface);
 
    if (!extrapolatedParameters) return 0.;
 
    double trackD0  = extrapolatedParameters->parameters()[Trk::d0];
    double trackPhi = extrapolatedParameters->parameters()[Trk::phi];
    double vs = sinf( atan2(jetMomentum.y(),jetMomentum.x()) - trackPhi )*trackD0;
 
    return (vs>=0. ? 1. : -1.);
  }

get3DLifetimeSignOfTrack()

double Trk::TrackToVertexIPEstimator::get3DLifetimeSignOfTrack ( const EventContext & ctx, const TrackParameters & track, const Amg::Vector3D & jetDirection, const xAOD::Vertex & primaryVertex ) const

overridevirtual

Definition at line 218 of file TrackToVertexIPEstimator.cxx.

  {
    const Amg::Vector3D & lp = primaryVertex.position();
    PerigeeSurface perigeeSurface(lp);
 
    std::unique_ptr<const Trk::TrackParameters> extrapolatedParameters =
      m_extrapolator->extrapolate(
        ctx, track, perigeeSurface);
 
    if (!extrapolatedParameters) return 0.;
 
    const Amg::Vector3D & primaryPos=primaryVertex.position();
    const Amg::Vector3D & trackPos=extrapolatedParameters->position();
    const Amg::Vector3D & trackMom=extrapolatedParameters->momentum();
 
    double sign=(jetMomentum.cross(trackMom)).dot(trackMom.cross(primaryPos-trackPos));
 
    return sign>=0.?1.:-1;
  }

getUnbiasedVertex() [1/2]

xAOD::Vertex * Trk::TrackToVertexIPEstimator::getUnbiasedVertex ( const TrackParameters * track, const xAOD::Vertex * vtx ) const

overridevirtual

Definition at line 299 of file TrackToVertexIPEstimator.cxx.

 {
   if (!track) {
     msg(MSG::INFO) << "Empty Trk::TrackParameter pointer passed. Returning zero " << endmsg;
     return nullptr;
   }
   if (!vtx) {
     msg(MSG::INFO) << "Empty xAOD::Vertex pointer passed. Returning zero " << endmsg;
     return nullptr;
   }
 
   if (vtx->nTrackParticles() == 0)
    {
      ATH_MSG_DEBUG("This vertex has no associated tracks. Normal if beam spot is used. Vertex already unbiased");
      return new xAOD::Vertex(*vtx);
    }
 
   //create new vertex for output
   xAOD::Vertex *outputVertex = new xAOD::Vertex(*vtx);
   outputVertex->clearTracks(); //remove all tracks -> will add them back one by one
   if (outputVertex->vxTrackAtVertexAvailable()) outputVertex->vxTrackAtVertex().clear(); //remove all VxTrackAtVertex
 
   bool tmpLinTrack = false; //do we created a new linearised track?
 
   //loop over tracks
   const Amg::Vector3D & pos = track->position();
   const Amg::Vector3D & mom = track->momentum();
   for (unsigned int itrk=0; itrk < vtx->nTrackParticles(); ++itrk) {
     const Perigee& testTP = vtx->trackParticle(itrk)->perigeeParameters();
     if ((testTP.position() == pos) and (testTP.momentum() == mom)) {
       //track found, now unbias the vertex using linearized track
       const LinearizedTrack *linTrack = nullptr;
       double trackWeight(0.0);
       //first check if a VxTrackAtVertex is already available with linearized track
       if (vtx->vxTrackAtVertexAvailable()) {
     if (vtx->vxTrackAtVertex().size() > itrk) {
       linTrack = vtx->vxTrackAtVertex()[itrk].linState();
       trackWeight = vtx->vxTrackAtVertex()[itrk].weight();
     }
       }
       //if linearized track is not available, create it
       if (!linTrack) {
     linTrack = m_linFactory->linearizedTrack(track, vtx->position());
     trackWeight = vtx->trackWeight(itrk);
     if (!linTrack) {
       ATH_MSG_INFO("Failing to linearized track. Returning biased vertex.");
       outputVertex->addTrackAtVertex(vtx->trackParticleLinks()[itrk], vtx->trackWeight(itrk));
       if (vtx->vxTrackAtVertexAvailable()) {
         outputVertex->vxTrackAtVertex().push_back(vtx->vxTrackAtVertex()[itrk]);//will clone everything inside -> output vertex owns all the memory
       }
       continue;
     }
     tmpLinTrack = true;
       }
       //now update vertex position removing the linearized track, and do not add the track back to the output vertex
       const IVertexUpdator::positionUpdateOutcome & reducedVertex = m_Updator->positionUpdate(*vtx, linTrack, trackWeight,IVertexUpdator::removeTrack);
 
       //calculate updated chi2
       double chi2 = vtx->chiSquared();
       double trk_chi = m_Updator->trackParametersChi2( reducedVertex, linTrack );
       chi2 += -1 * (m_Updator->vertexPositionChi2(*vtx, reducedVertex) + trackWeight * trk_chi);
 
       //calculate updated ndf
       double ndf = vtx->numberDoF();
       ndf += -1 * trackWeight * (2.0);
 
       //reducedVertex has the updated position and covariance
       outputVertex->setPosition(reducedVertex.position);
       outputVertex->setCovariancePosition(reducedVertex.covariancePosition);
 
       //chi2 and ndf now store the updated FitQuality
       outputVertex->setFitQuality( chi2, ndf );
 
       if (tmpLinTrack) delete linTrack; //only delete if it was created new, and doesn't belong to a vertex
     } else {
       //track not to be removed. Add back the track to the vertex collection
       outputVertex->addTrackAtVertex(vtx->trackParticleLinks()[itrk], vtx->trackWeight(itrk));
       if (vtx->vxTrackAtVertexAvailable()) {
     outputVertex->vxTrackAtVertex().push_back(vtx->vxTrackAtVertex()[itrk]);//will clone everything inside -> output vertex owns all the memory
       }
     }
   }
   return outputVertex;
 
 }

getUnbiasedVertex() [2/2]

xAOD::Vertex * Trk::TrackToVertexIPEstimator::getUnbiasedVertex ( const xAOD::TrackParticle * track, const xAOD::Vertex * vtx ) const

overridevirtual

Definition at line 288 of file TrackToVertexIPEstimator.cxx.

 {
  if(track)
  {
   return getUnbiasedVertex(&(track->perigeeParameters()),vtx);
  }
   msg(MSG::INFO) << "Empty xAOD::TrackParticle pointer passed. Returning zero " << endmsg;
   return nullptr;
  //end of track particle validity check
 }

getZLifetimeSignOfTrack()

double Trk::TrackToVertexIPEstimator::getZLifetimeSignOfTrack ( const EventContext & ctx, const TrackParameters & track, const Amg::Vector3D & jetDirection, const xAOD::Vertex & primaryVertex ) const

overridevirtual

Definition at line 262 of file TrackToVertexIPEstimator.cxx.

  {
 
    const Amg::Vector3D & lp = primaryVertex.position();
    PerigeeSurface perigeeSurface(lp);
 
    std::unique_ptr<const Trk::TrackParameters> extrapolatedParameters =
      m_extrapolator->extrapolate(
        ctx, track, perigeeSurface);
 
    if (!extrapolatedParameters) return 0.;
 
    double trackTheta  = extrapolatedParameters->parameters()[Trk::theta];
    double trackZ0 = extrapolatedParameters->parameters()[Trk::z0];
    double trackEta = -logf(tanf(trackTheta/2.));
    double jetEta = jetMomentum.eta();
    double zs = (jetEta - trackEta)*trackZ0;
    return (zs>=0. ? 1. : -1.);
  }

initialize()

StatusCode Trk::TrackToVertexIPEstimator::initialize ( )

overridevirtual

Default Athena interface methods.

Definition at line 26 of file TrackToVertexIPEstimator.cxx.

 {
 
  // uploading the corresponding tools
  // extrapolator
  if ( m_extrapolator.empty() ) {
      ATH_MSG_DEBUG("Extrapolator is None/Empty. Tool-dependent features will be disabled.");
  } else {
      // Only try to retrieve if a name was actually provided
      if ( m_extrapolator.retrieve().isFailure() ) {
          ATH_MSG_FATAL("Failed to retrieve tool " << m_extrapolator);
          return StatusCode::FAILURE;
      }
  }
  // updator
  if (m_Updator.retrieve().isFailure()) {
    ATH_MSG_FATAL("Failed to retrieve tool " << m_Updator);
    return StatusCode::FAILURE;
  }
 
  // linearized track factory
  if ( m_linFactory.retrieve().isFailure() )
  {
    ATH_MSG_FATAL("Failed to retrieve tool " << m_linFactory );
    return StatusCode::FAILURE;
  }
 
  return StatusCode::SUCCESS;
 }//end of initialize method

Member Data Documentation

m_extrapolator

ToolHandle<Trk::IExtrapolator> Trk::TrackToVertexIPEstimator::m_extrapolator

private

Initial value:

{this, "Extrapolator",
                                                "Trk::Extrapolator"}

Definition at line 140 of file TrackToVertexIPEstimator.h.

                                             {this, "Extrapolator",
                                                "Trk::Extrapolator"};

m_linFactory

ToolHandle<Trk::IVertexLinearizedTrackFactory> Trk::TrackToVertexIPEstimator::m_linFactory

private

Initial value:

{
      this, "LinearizedTrackFactory", "Trk::FullLinearizedTrackFactory"}

Definition at line 144 of file TrackToVertexIPEstimator.h.

                                                           {
      this, "LinearizedTrackFactory", "Trk::FullLinearizedTrackFactory"};

m_Updator

ToolHandle<Trk::IVertexUpdator> Trk::TrackToVertexIPEstimator::m_Updator

private

Initial value:

{this, "VertexUpdator",
                                            "Trk::KalmanVertexUpdator"}

Definition at line 142 of file TrackToVertexIPEstimator.h.

                                         {this, "VertexUpdator",
                                            "Trk::KalmanVertexUpdator"};

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

• TrackToVertexIPEstimator.h
• TrackToVertexIPEstimator.cxx