ActsTrk::TrackParamsEstimationTool Class Reference

#include <TrackParamsEstimationTool.h>

Inheritance diagram for ActsTrk::TrackParamsEstimationTool:

Collaboration diagram for ActsTrk::TrackParamsEstimationTool:

Public Member Functions
	TrackParamsEstimationTool (const std::string &type, const std::string &name, const IInterface *parent)
virtual	~TrackParamsEstimationTool ()=default
virtual StatusCode	initialize () override
virtual std::optional< Acts::BoundTrackParameters >	estimateTrackParameters (const EventContext &ctx, const ActsTrk::Seed &seed, const Acts::GeometryContext &geoContext, const Acts::MagneticFieldContext &magFieldContext, std::function< const Acts::Surface &(const ActsTrk::Seed &)> retrieveSurface) const override
virtual std::optional< Acts::BoundTrackParameters >	estimateTrackParameters (const EventContext &ctx, const ActsTrk::Seed &seed, const Acts::GeometryContext &geoContext, const Acts::Surface &surface, const Acts::BoundSquareMatrix &covariance, const Acts::Vector3 &bField, double bFieldMin) const override

Private Attributes
Gaudi::Property< double >	m_bFieldMin
Gaudi::Property< double >	m_sigmaLoc0
Gaudi::Property< double >	m_sigmaLoc1
Gaudi::Property< double >	m_sigmaPhi
Gaudi::Property< double >	m_sigmaTheta
Gaudi::Property< double >	m_sigmaQOverP
Gaudi::Property< double >	m_sigmaT0
Gaudi::Property< std::vector< double > >	m_initialVarInflation
Acts::BoundSquareMatrix	m_covariance = Acts::BoundSquareMatrix::Zero()
	The track parameters covariance (assumed to be the same for all estimated track parameters for the moment) More...

Detailed Description

Definition at line 14 of file TrackParamsEstimationTool.h.

Constructor & Destructor Documentation

TrackParamsEstimationTool()

ActsTrk::TrackParamsEstimationTool::TrackParamsEstimationTool	(	const std::string &	type,
		const std::string &	name,
		const IInterface *	parent
	)

Definition at line 10 of file TrackParamsEstimationTool.cxx.

    : base_class(type, name, parent)  
  {}

~TrackParamsEstimationTool()

virtual ActsTrk::TrackParamsEstimationTool::~TrackParamsEstimationTool ( )

virtualdefault

Member Function Documentation

estimateTrackParameters() [1/2]

std::optional< Acts::BoundTrackParameters > ActsTrk::TrackParamsEstimationTool::estimateTrackParameters ( const EventContext &  ctx, const ActsTrk::Seed &  seed, const Acts::GeometryContext &  geoContext, const Acts::MagneticFieldContext &  magFieldContext, std::function< const Acts::Surface &(const ActsTrk::Seed &)>  retrieveSurface  ) const

overridevirtual

Definition at line 47 of file TrackParamsEstimationTool.cxx.

  {
    const auto& sp_collection = seed.sp();
    if ( sp_collection.size() < 3 ) return std::nullopt;
    const auto& bottom_sp = sp_collection.front();
 
    // Magnetic Field
    ATLASMagneticFieldWrapper magneticField;
    Acts::MagneticFieldProvider::Cache magFieldCache = magneticField.makeCache( magFieldContext );
    Acts::Vector3 bField = *magneticField.getField( Acts::Vector3(bottom_sp->x(), bottom_sp->y(), bottom_sp->z()),
                                                    magFieldCache );
 
    // Get the surface
    const Acts::Surface& surface = retrieveSurface(seed);
 
    return estimateTrackParameters(ctx,
                   seed,
                   geoContext,
                   surface,
                   m_covariance,
                   bField,
                   m_bFieldMin);
  }

estimateTrackParameters() [2/2]

std::optional< Acts::BoundTrackParameters > ActsTrk::TrackParamsEstimationTool::estimateTrackParameters ( const EventContext &  ctx, const ActsTrk::Seed &  seed, const Acts::GeometryContext &  geoContext, const Acts::Surface &  surface, const Acts::BoundSquareMatrix &  covariance, const Acts::Vector3 &  bField, double  bFieldMin  ) const

overridevirtual

Definition at line 76 of file TrackParamsEstimationTool.cxx.

  {
    // Get SPs
    const auto& sp_collection = seed.sp();
    if ( sp_collection.size() < 3 ) return std::nullopt;
 
    // Compute Bound parameters at surface
    std::optional<Acts::BoundVector> params_opt =
      Acts::estimateTrackParamsFromSeed(geoContext,
                                        sp_collection.begin(),
                                        sp_collection.end(),
                                        surface,
                                        bField,
                                        bFieldMin);
 
    if ( not params_opt.has_value() )
      return std::nullopt;
 
    const auto& params = params_opt.value();
 
    // Create BoundTrackParameters
    return Acts::BoundTrackParameters(surface.getSharedPtr(),
                                      params,
                                      covariance,
                                      Acts::ParticleHypothesis::pion());
  }

initialize()

StatusCode ActsTrk::TrackParamsEstimationTool::initialize ( )

overridevirtual

Definition at line 16 of file TrackParamsEstimationTool.cxx.

  {
    ATH_MSG_INFO( "Initializing " << name() << "..." );
 
    ATH_MSG_DEBUG( "Properties Summary:" );
    ATH_MSG_DEBUG( "   " << m_bFieldMin );
    ATH_MSG_DEBUG( "   " << m_sigmaLoc0 );
    ATH_MSG_DEBUG( "   " << m_sigmaLoc1 );
    ATH_MSG_DEBUG( "   " << m_sigmaPhi );
    ATH_MSG_DEBUG( "   " << m_sigmaTheta );
    ATH_MSG_DEBUG( "   " << m_sigmaQOverP );
    ATH_MSG_DEBUG( "   " << m_sigmaT0 );
    ATH_MSG_DEBUG( "   " << m_initialVarInflation );
 
    m_covariance(Acts::eBoundLoc0, Acts::eBoundLoc0) =
      m_initialVarInflation[Acts::eBoundLoc0] * m_sigmaLoc0 * m_sigmaLoc0;
    m_covariance(Acts::eBoundLoc1, Acts::eBoundLoc1) =
      m_initialVarInflation[Acts::eBoundLoc1] * m_sigmaLoc1 * m_sigmaLoc1;
    m_covariance(Acts::eBoundPhi, Acts::eBoundPhi) =
      m_initialVarInflation[Acts::eBoundPhi] * m_sigmaPhi * m_sigmaPhi;
    m_covariance(Acts::eBoundTheta, Acts::eBoundTheta) =
      m_initialVarInflation[Acts::eBoundTheta] * m_sigmaTheta * m_sigmaTheta;
    m_covariance(Acts::eBoundQOverP, Acts::eBoundQOverP) =
      m_initialVarInflation[Acts::eBoundQOverP] * m_sigmaQOverP * m_sigmaQOverP;
    m_covariance(Acts::eBoundTime, Acts::eBoundTime) =
      m_initialVarInflation[Acts::eBoundTime] * m_sigmaT0 * m_sigmaT0;
 
    return StatusCode::SUCCESS;
  }

Member Data Documentation

m_bFieldMin

Gaudi::Property< double > ActsTrk::TrackParamsEstimationTool::m_bFieldMin

private

Initial value:

{this, "bFieldMin", 0.1 * Acts::UnitConstants::T,
        "The minimum magnetic field to trigger the track parameters estimation"}

Definition at line 48 of file TrackParamsEstimationTool.h.

m_covariance

Acts::BoundSquareMatrix ActsTrk::TrackParamsEstimationTool::m_covariance = Acts::BoundSquareMatrix::Zero()

private

The track parameters covariance (assumed to be the same for all estimated track parameters for the moment)

Definition at line 67 of file TrackParamsEstimationTool.h.

m_initialVarInflation

Gaudi::Property< std::vector<double> > ActsTrk::TrackParamsEstimationTool::m_initialVarInflation

private

Initial value:

{this, "initialVarInflation", {1., 1., 1., 1., 1., 1.},
        "Inflate tracks"}

Definition at line 62 of file TrackParamsEstimationTool.h.

m_sigmaLoc0

Gaudi::Property< double > ActsTrk::TrackParamsEstimationTool::m_sigmaLoc0

private

Initial value:

{this, "sigmaLoc0", 25 * Acts::UnitConstants::um,
        "Constant term of the loc0 resolution"}

Definition at line 50 of file TrackParamsEstimationTool.h.

m_sigmaLoc1

Gaudi::Property< double > ActsTrk::TrackParamsEstimationTool::m_sigmaLoc1

private

Initial value:

{this, "sigmaLoc1", 100 * Acts::UnitConstants::um,
        "Constant term of the loc1 resolution"}

Definition at line 52 of file TrackParamsEstimationTool.h.

m_sigmaPhi

Gaudi::Property< double > ActsTrk::TrackParamsEstimationTool::m_sigmaPhi

private

Initial value:

{this, "sigmaPhi", 0.02 * Acts::UnitConstants::degree,
        "Phi angular resolution"}

Definition at line 54 of file TrackParamsEstimationTool.h.

m_sigmaQOverP

Gaudi::Property< double > ActsTrk::TrackParamsEstimationTool::m_sigmaQOverP

private

Initial value:

{this, "sigmaQOverP", 0.1 / Acts::UnitConstants::GeV,
        "q/p resolution"}

Definition at line 58 of file TrackParamsEstimationTool.h.

m_sigmaT0

Gaudi::Property< double > ActsTrk::TrackParamsEstimationTool::m_sigmaT0

private

Initial value:

{this, "sigmaT0", 1 * Acts::UnitConstants::ns,
        "Time resolution"}

Definition at line 60 of file TrackParamsEstimationTool.h.

m_sigmaTheta

Gaudi::Property< double > ActsTrk::TrackParamsEstimationTool::m_sigmaTheta

private

Initial value:

{this, "sigmaTheta", 0.02 * Acts::UnitConstants::degree,
        "Theta angular resolution"}

Definition at line 56 of file TrackParamsEstimationTool.h.

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

• TrackParamsEstimationTool.h
• TrackParamsEstimationTool.cxx