MuonR4::HoughHelpers::Phi Namespace Reference

Functions
double	houghParamStrip (double tanAlpha, const MuonR4::HoughHitType &dc)
	straight line parametrisation for strip detector measurements, in the x-direction
double	houghWidthStrip (double tanAlpha, const MuonR4::HoughHitType &dc, double targetReso)
	Uncertainty parametrisation for strip measurements.

Function Documentation

houghParamStrip()

double MuonR4::HoughHelpers::Phi::houghParamStrip	(	double	tanAlpha,
		const MuonR4::HoughHitType &	dc )

straight line parametrisation for strip detector measurements, in the x-direction

Parameters

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

Returns

the x offset needed to pass through the center of the strip space point for an inclination angle tanAlpha

Definition at line 35 of file HoughHelperFunctions.cxx.

                                                                                 {
            return strip->localPosition().x() - tanAlpha * strip->localPosition().z();
        }

houghWidthStrip()

double MuonR4::HoughHelpers::Phi::houghWidthStrip	(	double	tanAlpha,
		const MuonR4::HoughHitType &	dc,
		double	targetReso )

Uncertainty parametrisation for strip measurements.

Parameters

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

Returns

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

Definition at line 38 of file HoughHelperFunctions.cxx.

                                                                                             {
            const double nomCov = 3.*std::sqrt(strip->covariance()[Acts::toUnderlying(AxisDefs::phiCov)]);
            return std::max(targetReso, 3 * nomCov);  // return positional uncertainty defined during SP creation
        }