#include <DTrackCandidate_factory_FDC.h>

Inheritance diagram for DTrackCandidate_factory_FDC:

Classes
class	DFDCSeed

class	DFDCTrkHit

Public Types
enum	trk_flags_t { NONE = 0x000, NOISE = 0x001, USED = 0x002, CANT_BE_IN_SEED = 0x008, ON_CIRCLE = 0x010, IN_THETA_RANGE = 0x020, IN_Z_RANGE = 0x040, VALID_HIT = 0x080, OUT_OF_TIME = 0x100 }

enum	ret_cond_t { FIT_OK = 0, NO_SEED, BAD_SEED, FIND_FAILED }

Public Member Functions
	DTrackCandidate_factory_FDC ()

	~DTrackCandidate_factory_FDC ()

virtual const char *	Tag (void)

Protected Member Functions
virtual jerror_t	init (void)

virtual jerror_t	brun (JEventLoop *loop, int32_t runnumber)

virtual jerror_t	evnt (JEventLoop *loop, uint64_t eventnumber)
	Invoked via JEventProcessor virtual method. More...

virtual jerror_t	fini (void)
	Invoked via JEventProcessor virtual method. More...

void	GetTrkHits (JEventLoop *loop)

void	FindSeeds (vector< DFDCSeed > &seeds)

void	FillSeedHits (DFDCSeed &seed)

unsigned int	NumAvailableHits (void)

void	FindThetaZ (DFDCSeed &seed)

void	FindTheta (DFDCSeed &seed, double target_z_min, double target_z_max)

void	FindZ (DFDCSeed &seed, double theta_min, double theta_max)

Protected Attributes
DHoughFind	hough

vector< DFDCTrkHit * >	fdctrkhits

float	TARGET_Z_MIN

float	TARGET_Z_MAX

double	MAX_HIT_DIST

double	MAX_HIT_DIST2

Detailed Description

This is an alternate FDC track finder that is not used as part of the default reconstruction. It is no longer maintained, but is kept around as an independent check against the default FDC finder in DTrackCandiate_factory_FDCpseudo .

This was originally written to help study the possibility of a wires only design of the FDC. As such, it uses the DFDCIntersection objects as inputs which have a far worse position resolution than what is achievable with the the cathode strips. Consequently, this tended to produce more ghost tracks.

Definition at line 43 of file DTrackCandidate_factory_FDC.h.

Member Enumeration Documentation

enum DTrackCandidate_factory_FDC::ret_cond_t

Enumerator
FIT_OK
NO_SEED
BAD_SEED
FIND_FAILED

Definition at line 61 of file DTrackCandidate_factory_FDC.h.

enum DTrackCandidate_factory_FDC::trk_flags_t

Enumerator
NONE
NOISE
USED
CANT_BE_IN_SEED
ON_CIRCLE
IN_THETA_RANGE
IN_Z_RANGE
VALID_HIT
OUT_OF_TIME

Definition at line 49 of file DTrackCandidate_factory_FDC.h.

Constructor & Destructor Documentation

DTrackCandidate_factory_FDC::DTrackCandidate_factory_FDC ( )

Definition at line 34 of file DTrackCandidate_factory_FDC.cc.

DTrackCandidate_factory_FDC::~DTrackCandidate_factory_FDC ( )

inline

Definition at line 46 of file DTrackCandidate_factory_FDC.h.

Member Function Documentation

jerror_t DTrackCandidate_factory_FDC::brun	(	JEventLoop *	loop,
		int32_t	runnumber
	)

protectedvirtual

Definition at line 60 of file DTrackCandidate_factory_FDC.cc.

jerror_t DTrackCandidate_factory_FDC::evnt	(	JEventLoop *	loop,
		uint64_t	eventnumber
	)

protectedvirtual

Invoked via JEventProcessor virtual method.

Definition at line 76 of file DTrackCandidate_factory_FDC.cc.

References _DBG_, DTrackCandidate_factory_FDC::DFDCSeed::p_trans, DTrackCandidate_factory_FDC::DFDCSeed::phi, PiMinus, PiPlus, DTrackCandidate_factory_FDC::DFDCSeed::q, seed, DKinematicData::setMomentum(), DKinematicData::setPID(), DKinematicData::setPosition(), sin(), DTrackCandidate_factory_FDC::DFDCSeed::theta, DTrackCandidate_factory_FDC::DFDCSeed::valid, and DTrackCandidate_factory_FDC::DFDCSeed::z_vertex.

void DTrackCandidate_factory_FDC::FillSeedHits ( DFDCSeed & seed )

protected

Definition at line 252 of file DTrackCandidate_factory_FDC.cc.

References _DBG_, FDCSortByZincreasing(), DTrackCandidate_factory_FDC::DFDCTrkHit::flags, h, DTrackCandidate_factory_FDC::DFDCTrkHit::hit, DTrackCandidate_factory_FDC::DFDCSeed::hits, DFDCWire::layer, DTrackCandidate_factory_FDC::DFDCTrkHit::phi_hit, DFDCIntersection::pos, DTrackCandidate_factory_FDC::DFDCSeed::q, DFDCIntersection::wire2, DTrackCandidate_factory_FDC::DFDCSeed::x0, and DTrackCandidate_factory_FDC::DFDCSeed::y0.

void DTrackCandidate_factory_FDC::FindSeeds ( vector< DFDCSeed > & seeds )

protected

Definition at line 168 of file DTrackCandidate_factory_FDC.cc.

void DTrackCandidate_factory_FDC::FindTheta	(	DFDCSeed &	seed,
		double	target_z_min,
		double	target_z_max
	)

protected

Find the theta value using the hits from seed. The value of seed.r0 is used to calculate theta.

This uses a histogramming technique that looks at the overlaps of the angle ranges subtended by each hit between the given target limits. The overlaps usually lead to a range of values for theta. The limits of these are stored in the theta_min and theta_max fields of the seed. The centroid of the range is stored in the theta field.

Definition at line 391 of file DTrackCandidate_factory_FDC.cc.

void DTrackCandidate_factory_FDC::FindThetaZ ( DFDCSeed & seed )

protected

Definition at line 356 of file DTrackCandidate_factory_FDC.cc.

References _DBG_, DTrackCandidate_factory_FDC::DFDCTrkHit::flags, DTrackCandidate_factory_FDC::DFDCSeed::hits, DTrackCandidate_factory_FDC::DFDCSeed::theta_max, DTrackCandidate_factory_FDC::DFDCSeed::theta_min, DTrackCandidate_factory_FDC::DFDCSeed::valid, and DTrackCandidate_factory_FDC::DFDCSeed::z_vertex.

void DTrackCandidate_factory_FDC::FindZ	(	DFDCSeed &	seed,
		double	theta_min,
		double	theta_max
	)

protected

Find the z value of the vertex using the valid stereo hits from seed. The values for phi_hit and pos.Z() are assumed to be valid as is the status of the VALID_HIT bit in flags.

This uses a histogramming technique that looks at the overlaps of the z ranges subtended by each hit between the given theta limits. The overlaps usually lead to a range of values for z_vertex. The limits of these are stored in the z_min and z_max fields of the seed. The centroid of the range is stored in the z_vertex field.

Definition at line 501 of file DTrackCandidate_factory_FDC.cc.