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Acts::HelicalTrackLinearizer< propagator_t, propagator_options_t > Class Template Reference

#include <acts/blob/master/Core/include/Acts/Vertexing/HelicalTrackLinearizer.hpp>

+ Collaboration diagram for Acts::HelicalTrackLinearizer< propagator_t, propagator_options_t >:

Classes

struct  Config
 Configuration struct. More...
 

Public Types

using Propagator_t = propagator_t
 
using BField_t = typename Propagator_t::Stepper::BField
 

Public Member Functions

 HelicalTrackLinearizer (const Config &config)
 Constructor.
 
Result< LinearizedTracklinearizeTrack (const BoundParameters &params, const SpacePointVector &linPoint, const Acts::GeometryContext &gctx, const Acts::MagneticFieldContext &mctx) const
 Function that linearizes BoundParameters at given linearization point.
 

Private Attributes

const Config m_cfg
 Configuration object.
 

Detailed Description

template<typename propagator_t, typename propagator_options_t = PropagatorOptions<>>
class Acts::HelicalTrackLinearizer< propagator_t, propagator_options_t >

Linearizes the measurement equation (dependance of track parameters on the vertex position and track momentum at vertex) at the vicinity of the user-provided linearization point.

The measurement equation is linearized in the following way:

q_k= A_k (x_k - x_0k) + B_k (p_k - p_0k) + c_k

where q_k are the parameters at perigee nearest to the lin point, x_k is the position of the vertex, p_k the track momentum at the vertex, and c_k is the constant term of expansion. A_k and B_k are matrices of derivatives, denoted hereafter as "positionJacobian" and "momentumJacobian" respectively.

Ref.(1) - CERN-THESIS-2010-027, Giacinto Piacquadio (Freiburg U.)

Template Parameters
propagator_tPropagator type
propagator_options_tPropagator options type

Definition at line 44 of file HelicalTrackLinearizer.hpp.

View newest version in sPHENIX GitHub at line 44 of file HelicalTrackLinearizer.hpp

Member Typedef Documentation

template<typename propagator_t , typename propagator_options_t = PropagatorOptions<>>
using Acts::HelicalTrackLinearizer< propagator_t, propagator_options_t >::BField_t = typename Propagator_t::Stepper::BField

Definition at line 47 of file HelicalTrackLinearizer.hpp.

View newest version in sPHENIX GitHub at line 47 of file HelicalTrackLinearizer.hpp

template<typename propagator_t , typename propagator_options_t = PropagatorOptions<>>
using Acts::HelicalTrackLinearizer< propagator_t, propagator_options_t >::Propagator_t = propagator_t

Definition at line 46 of file HelicalTrackLinearizer.hpp.

View newest version in sPHENIX GitHub at line 46 of file HelicalTrackLinearizer.hpp

Constructor & Destructor Documentation

template<typename propagator_t , typename propagator_options_t = PropagatorOptions<>>
Acts::HelicalTrackLinearizer< propagator_t, propagator_options_t >::HelicalTrackLinearizer ( const Config config)
inline

Constructor.

Parameters
configConfiguration object

Definition at line 80 of file HelicalTrackLinearizer.hpp.

View newest version in sPHENIX GitHub at line 80 of file HelicalTrackLinearizer.hpp

Member Function Documentation

template<typename propagator_t , typename propagator_options_t >
Acts::Result< Acts::LinearizedTrack > Acts::HelicalTrackLinearizer< propagator_t, propagator_options_t >::linearizeTrack ( const BoundParameters params,
const SpacePointVector linPoint,
const Acts::GeometryContext gctx,
const Acts::MagneticFieldContext mctx 
) const

Function that linearizes BoundParameters at given linearization point.

Parameters
paramsParameters to linearize
linPointLinearization point
gctxThe geometry context
mctxThe magnetic field context
Returns
Linearized track

F(V, p_i) at PCA in Billoir paper (see FullBilloirVertexFitter.hpp for paper reference, Page 140, Eq. (2) )

Definition at line 13 of file HelicalTrackLinearizer.ipp.

View newest version in sPHENIX GitHub at line 13 of file HelicalTrackLinearizer.ipp

References kdfinder::abs(), Acts::backward, Acts::IntegrationTest::Bz, Acts::SingleTrackParameters< ChargePolicy >::covariance(), Acts::ePHI, Acts::eQOP, Acts::eTHETA, Acts::eZ, Acts::SingleTrackParameters< ChargePolicy >::get(), M_PI, Acts::SingleTrackParameters< ChargePolicy >::parameters(), Acts::SingleTrackParameters< ChargePolicy >::position(), position, Q, Acts::IntegrationTest::R, S(), X, and Y.

Referenced by Acts::Test::BOOST_AUTO_TEST_CASE().

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Member Data Documentation

template<typename propagator_t , typename propagator_options_t = PropagatorOptions<>>
const Config Acts::HelicalTrackLinearizer< propagator_t, propagator_options_t >::m_cfg
private

Configuration object.

Definition at line 98 of file HelicalTrackLinearizer.hpp.

View newest version in sPHENIX GitHub at line 98 of file HelicalTrackLinearizer.hpp


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