alcor_recotrackdata.h File Reference

Track-matched reconstructed hit data for the ePIC dRICH prototype. More...

#include "alcor_recodata.h"
#include "tracking_altai.h"
#include <vector>
#include <cmath>
#include "TTree.h"

Go to the source code of this file.

Classes
struct	alcor_recotrackdata_struct
	Track fit parameters and extrapolated position for one telescope plane. More...
class	alcor_recotrackdata
	Container for track-matched reconstructed data. More...

Functions
double	calculate_angle (double detector_to_telescope_plane, double pixel_position)
	Compute the track angle at the detector plane.
double	calculate_angle_resolution (double detector_to_telescope_plane, double detector_to_telescope_plane_error, double pixel_position, double pixel_position_error)
	Compute track-angle resolution via error propagation (stub).

Variables
const double	detector_to_telescope_plane_0 = 235.
	Distance to plane 0 [cm].
const double	detector_to_telescope_plane_1 = detector_to_telescope_plane_0 + 2.55
	Distance to plane 1 [cm].
const double	detector_to_telescope_plane_2 = detector_to_telescope_plane_1 + 22.5
	Distance to plane 2 [cm].
const double	detector_to_telescope_plane_3 = detector_to_telescope_plane_2 + 2.55
	Distance to plane 3 [cm].
const double	pixel_resolution_plane_0 = 3.7e-3
	Plane 0 pixel resolution [cm].
const double	pixel_resolution_plane_1 = 3.4e-3
	Plane 1 pixel resolution [cm].
const double	pixel_resolution_plane_2 = 3.4e-3
	Plane 2 pixel resolution [cm].
const double	pixel_resolution_plane_3 = 3.7e-3
	Plane 3 pixel resolution [cm].

Detailed Description

Track-matched reconstructed hit data for the ePIC dRICH prototype.

Extends alcor_recodata with per-track information imported from the ALTAI tracking telescope. Defines alcor_recotrackdata_struct (track fit parameters for one telescope plane) and alcor_recotrackdata (the container class providing track accessors, ROOT TTree I/O, and import from tracking_altai).

Function Documentation

calculate_angle()

double calculate_angle ( double  detector_to_telescope_plane, double  pixel_position  )

inline

Compute the track angle at the detector plane.

Returns atan(pixel_position / detector_to_telescope_plane), giving the angle [rad] that the track makes with the beam axis.

Parameters

detector_to_telescope_plane	Distance from detector to telescope plane [cm].
pixel_position	Pixel displacement from the beam axis [cm].

Returns

Track angle [rad].

calculate_angle_resolution()

double calculate_angle_resolution ( double  detector_to_telescope_plane, double  detector_to_telescope_plane_error, double  pixel_position, double  pixel_position_error  )

inline

Compute track-angle resolution via error propagation (stub).

Propagates uncertainties on both the plane distance and the pixel position through the atan formula.

Parameters

detector_to_telescope_plane	Nominal distance [cm].
detector_to_telescope_plane_error	Uncertainty on the distance [cm].
pixel_position	Nominal pixel displacement [cm].
pixel_position_error	Uncertainty on the pixel position [cm].

Returns

Track angle resolution [rad]; returns -1 until implemented.

Todo:

Implement proper error propagation.