MuonExperimental::Gx2fMaterialProperties::ELossAtSurface Struct Reference

Auxiliary struct to include the measured energy loss at a surface. More...

#include <Chi2Fitter.h>

Collaboration diagram for MuonExperimental::Gx2fMaterialProperties::ELossAtSurface:

Public Member Functions
constexpr bool	isValid () const
	Is the measured energy loss valid.
constexpr double	lostEnergy () const
	The amount of lost energy (Bethe bloch / measurement).
constexpr double	lostSigma () const
	The uncertainty on the energy loss.
	ELossAtSurface ()=default
	Default constructor to construct an invalid energy loss.
	ELossAtSurface (const double energy, const double sigma) noexcept
	Constructor taking the measured energy loss and its uncertainty.
ELossAtSurface &	operator+= (const ELossAtSurface &other) noexcept
	Absorb the energy loss from another object.

Static Public Member Functions
static ELossAtSurface	invalidELoss (const GeometryContext &geoContext, const CalibrationContext &calibContext, const Vector3 &pos, const Vector3 &dir, const Surface &matSurface)
	Function that satisfies the eLossAccumulator delegate pattern and the produces an invalid energy loss at any passed material surface.

Private Attributes
bool	m_isValid {false}
	Flag toggling whether the parameters are valid.
double	m_lostEnergy {0.}
	The amount of lost energy at a given surface.
double	m_lossSigma {0.}
	The uncertainty on the lost energy.

Detailed Description

Auxiliary struct to include the measured energy loss at a surface.

If the fitter reaches a surface with material a delegate is called to evaluate the measured energy loss at the surface. If the struct is valid the measured loss and its associated uncertainty are plugged into the chi2 system. Otherwise, the energy loss from the tracking geometry material is taken.

Definition at line 69 of file Chi2Fitter.h.

Constructor & Destructor Documentation

ELossAtSurface() [1/2]

MuonExperimental::Gx2fMaterialProperties::ELossAtSurface::ELossAtSurface ( )

default

Default constructor to construct an invalid energy loss.

ELossAtSurface() [2/2]

MuonExperimental::Gx2fMaterialProperties::ELossAtSurface::ELossAtSurface ( const double energy, const double sigma )

inlineexplicitnoexcept

Constructor taking the measured energy loss and its uncertainty.

Parameters

energy	The measured lost energy at the corresponding surface
sigma	The uncertainty on the measured lost energy

Definition at line 87 of file Chi2Fitter.h.

        : m_isValid{std::min(energy, sigma) > Acts::s_epsilon},
          m_lostEnergy{energy},
          m_lossSigma{sigma} {}

Member Function Documentation

invalidELoss()

Gx2fMaterialProperties::ELossAtSurface MuonExperimental::Gx2fMaterialProperties::ELossAtSurface::invalidELoss ( const GeometryContext & geoContext, const CalibrationContext & calibContext, const Vector3 & pos, const Vector3 & dir, const Surface & matSurface )

static

Function that satisfies the eLossAccumulator delegate pattern and the produces an invalid energy loss at any passed material surface.

Parameters

geoContext:The	geometry context to align the material surface
calibContext	The calibration context to retrieve the detector conditions to apply the calibration on the contributing calorimeter cells
pos	Current position along the trajectory (global frame)
dir	Trajectory direction at the current position (glboal frame)
matSurface	The material surface at which the propagtions stops

Returns

An invalid EnergyLoss such that the loss will be estimated from the Bethe-Bloch formula

Definition at line 167 of file Chi2Fitter.cxx.

                                                                     {
  return ELossAtSurface{};
}

isValid()

bool MuonExperimental::Gx2fMaterialProperties::ELossAtSurface::isValid ( ) const

inlineconstexpr

Is the measured energy loss valid.

Returns

Flag indicating the energy loss validity

Definition at line 72 of file Chi2Fitter.h.

{ return m_isValid; }

lostEnergy()

double MuonExperimental::Gx2fMaterialProperties::ELossAtSurface::lostEnergy ( ) const

inlineconstexpr

The amount of lost energy (Bethe bloch / measurement).

Returns

The lost energy at the surface

Definition at line 76 of file Chi2Fitter.h.

{ return m_lostEnergy; }

lostSigma()

double MuonExperimental::Gx2fMaterialProperties::ELossAtSurface::lostSigma ( ) const

inlineconstexpr

The uncertainty on the energy loss.

Returns

Uncertainty on the lost energy at the surface

Definition at line 79 of file Chi2Fitter.h.

{ return m_lossSigma; }

operator+=()

ELossAtSurface & MuonExperimental::Gx2fMaterialProperties::ELossAtSurface::operator+= ( const ELossAtSurface & other )

inlinenoexcept

Absorb the energy loss from another object.

Definition at line 93 of file Chi2Fitter.h.

                                                                   {
      if (&other != this && other.isValid()) {
        m_lostEnergy += other.m_lostEnergy;
        m_lossSigma = Acts::fastHypot(m_lossSigma, other.lostSigma());
        m_isValid = true;
      }
      return *this;
    }

Member Data Documentation

m_isValid

bool MuonExperimental::Gx2fMaterialProperties::ELossAtSurface::m_isValid {false}

private

Flag toggling whether the parameters are valid.

Definition at line 118 of file Chi2Fitter.h.

{false};

m_lossSigma

double MuonExperimental::Gx2fMaterialProperties::ELossAtSurface::m_lossSigma {0.}

private

The uncertainty on the lost energy.

Definition at line 122 of file Chi2Fitter.h.

{0.};

m_lostEnergy

double MuonExperimental::Gx2fMaterialProperties::ELossAtSurface::m_lostEnergy {0.}

private

The amount of lost energy at a given surface.

Definition at line 120 of file Chi2Fitter.h.

{0.};

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

• Chi2Fitter.h
• Chi2Fitter.cxx