MuonR4::HoughHelpers::Eta Namespace Reference

Functions
double	houghParamMdtLeft (double tanTheta, const MuonR4::HoughHitType &dc)
	left-side straight line parametrisation for drift circles More...
double	houghParamMdtRight (double tanTheta, const MuonR4::HoughHitType &dc)
	right-side straight line parametrisation for drift circles More...
double	houghParamStrip (double tanTheta, const MuonR4::HoughHitType &strip)
	straight line parametrisation for strip detector measurements More...
double	houghWidthMdt (double tanTheta, const MuonR4::HoughHitType &dc)
	uncertainty parametrisation for drift circles More...
double	houghWidthStrip (double tanTheta, const MuonR4::HoughHitType &strip)
	Uncertainty parametrisation for strip measurements. More...

Function Documentation

houghParamMdtLeft()

double MuonR4::HoughHelpers::Eta::houghParamMdtLeft	(	double	tanTheta,
		const MuonR4::HoughHitType &	dc
	)

left-side straight line parametrisation for drift circles

Parameters

tanTheta	the input inclination angle
dc	the drift circle (expressed as a space point)

Returns

the y offset needed to touch the drift radius on the left for an inclination angle tanTheta

Definition at line 9 of file HoughHelperFunctions.cxx.

                                                                                         {
    return DC->positionInChamber().y() - tanTheta * DC->positionInChamber().z() -
           DC->driftRadius() * std::sqrt(1 + (tanTheta*tanTheta));    // using cos(theta) = sqrt(1/[1+tan²(theta)])
  }

houghParamMdtRight()

double MuonR4::HoughHelpers::Eta::houghParamMdtRight	(	double	tanTheta,
		const MuonR4::HoughHitType &	dc
	)

right-side straight line parametrisation for drift circles

Parameters

tanTheta	the input inclination angle
dc	the drift circle (expressed as a space point)

Returns

the y offset needed to touch the drift radius on the right for an inclination angle tanTheta

Definition at line 13 of file HoughHelperFunctions.cxx.

                                                                                          {
    return DC->positionInChamber().y() - tanTheta * DC->positionInChamber().z() +
           DC->driftRadius() * std::sqrt(1 + (tanTheta*tanTheta));    // using cos(theta) = sqrt(1/[1+tan²(theta)])
  }

houghParamStrip()

double MuonR4::HoughHelpers::Eta::houghParamStrip	(	double	tanTheta,
		const MuonR4::HoughHitType &	strip
	)

straight line parametrisation for strip detector measurements

Parameters

tanTheta	the input inclination angle
strip	the strip measurement (expressed as a space point)

Returns

the y offset needed to pass through the center of the strip space point for an inclination angle tanTheta

Definition at line 17 of file HoughHelperFunctions.cxx.

                                                                                          {
    return strip->positionInChamber().y() - tanTheta * strip->positionInChamber().z();
  }

houghWidthMdt()

double MuonR4::HoughHelpers::Eta::houghWidthMdt	(	double	tanTheta,
		const MuonR4::HoughHitType &	dc
	)

uncertainty parametrisation for drift circles

Parameters

tanTheta	the input inclination angle
dc	the drift circle (expressed as a space point)

Returns

the uncertainty on the y offset - calculated from an inflated drift circle error and a baseline uncertainty to account for the not fully known t0

Definition at line 21 of file HoughHelperFunctions.cxx.

                                                                              {
    return std::min(DC->uncertainty().y() * 3.,
                    1.0);  // scale reported errors up to at least 1mm or 3
                           // times the reported error as drift circle calib not
                           // fully reliable at this stage
  }

houghWidthStrip()

double MuonR4::HoughHelpers::Eta::houghWidthStrip	(	double	tanTheta,
		const MuonR4::HoughHitType &	strip
	)

Uncertainty parametrisation for strip measurements.

Parameters

tanTheta	the input inclination angle (not used)
strip	the strip measurement (expressed as a space point)

Returns

the uncertainty on the y offset - based on the strip pitch

Definition at line 27 of file HoughHelperFunctions.cxx.

                                                                                   {
      return 3. * strip->uncertainty().y() * ((strip->primaryMeasurement()->type() == xAOD::UncalibMeasType::TgcStripType && !strip->measuresPhi()) ? 1.5 : 1.0);  // return positional uncertainty defined during SP creation
  }