#include <CSCSegAlgoDF.h>

Inheritance diagram for CSCSegAlgoDF:

Public Types
typedef std::deque< bool >	BoolContainer

typedef std::vector< const CSCRecHit2D * >	ChamberHitContainer

typedef std::vector< const CSCRecHit2D * > ::const_iterator	ChamberHitContainerCIt

typedef std::vector< int >	LayerIndex
	Typedefs. More...

Public Member Functions
std::vector< CSCSegment >	buildSegments (const ChamberHitContainer &rechits)

	CSCSegAlgoDF (const edm::ParameterSet &ps)
	Constructor. More...

std::vector< CSCSegment >	run (const CSCChamber *aChamber, const ChamberHitContainer &rechits)

virtual	~CSCSegAlgoDF ()
	Destructor. More...

Public Member Functions inherited from CSCSegmentAlgorithm
	CSCSegmentAlgorithm (const edm::ParameterSet &)
	Constructor. More...

virtual std::vector< CSCSegment >	run (const CSCChamber chamber, const std::vector< const CSCRecHit2D > &rechits)=0

virtual	~CSCSegmentAlgorithm ()
	Destructor. More...

Private Member Functions
bool	addHit (const CSCRecHit2D *hit, int layer)

void	compareProtoSegment (const CSCRecHit2D *h, int layer)

void	dumpSegment (const CSCSegment &seg) const

void	flagHitsAsUsed (const ChamberHitContainer &rechitsInChamber)

bool	hasHitOnLayer (int layer) const

bool	isHitNearSegment (const CSCRecHit2D *h) const

void	pruneFromResidual (void)

void	tryAddingHitsToSegment (const ChamberHitContainer &rechitsInChamber, const ChamberHitContainerCIt i1, const ChamberHitContainerCIt i2, const LayerIndex &layerIndex)
	Utility functions. More...

void	updateParameters (void)

Private Attributes
float	chi2Max

ChamberHitContainer	closeHits

bool	debug

double	dPhiFineMax

double	dRPhiFineMax

float	maxRatioResidual

int	minHitsForPreClustering

int	minHitsPerSegment

int	minLayersApart

const std::string	myName

int	nHitsPerClusterIsShower

CSCSegAlgoPreClustering *	preCluster_

bool	preClustering

ChamberHitContainer	protoSegment

bool	Pruning

ChamberHitContainer	secondSeedHits

CSCSegFit *	sfit_

CSCSegAlgoShowering *	showering_

float	tanPhiMax

float	tanThetaMax

const CSCChamber *	theChamber

BoolContainer	usedHits

Detailed Description

This is a modified version of the SK algorithm for building endcap muon track segments out of the rechit's in a CSCChamber.

A CSCSegment is a RecSegment4D, and is built from CSCRecHit2D objects, each of which is a RecHit2DLocalPos.

This builds segments by first creating proto-segments from at least 3 hits. We intend to try all possible pairs of hits to start segment building. 'All possible' means each hit lies on different layers in the chamber. Once a hit has been assigned to a segment, we don't consider it again, THAT IS, FOR THE FIRST PASS ONLY ! In fact, this is one of the possible flaw with the SK algorithms as it sometimes manages to build segments with the wrong starting points. In the DF algorithm, the endpoints are tested as the best starting points in a 2nd and 3rd loop.

Another difference with the from the SK algorithm is that rechits can be added to proto segments if they fall within n sigmas of the projected track within a given layer. Hence, a cylinder isn't used as in the SK algorimthm, which allows for pseudo 2D hits built from wire or strip only hits to be used in segment reconstruction.

Also, only a certain muonsPerChamberMax maximum number of segments can be produced in the chamber. [Seems to be hardwired rather than using this variable?]

Alternative algorithms can be used for the segment building by writing classes like this, and then selecting which one is actually used via the CSCSegmentBuilder.

Author: Dominique Fortin - UCR

Definition at line 48 of file CSCSegAlgoDF.h.

Member Typedef Documentation

typedef std::deque<bool> CSCSegAlgoDF::BoolContainer

Definition at line 58 of file CSCSegAlgoDF.h.

typedef std::vector<const CSCRecHit2D*> CSCSegAlgoDF::ChamberHitContainer

Definition at line 56 of file CSCSegAlgoDF.h.

typedef std::vector<const CSCRecHit2D*>::const_iterator CSCSegAlgoDF::ChamberHitContainerCIt

Definition at line 57 of file CSCSegAlgoDF.h.

typedef std::vector<int> CSCSegAlgoDF::LayerIndex

Typedefs.

Definition at line 55 of file CSCSegAlgoDF.h.

Constructor & Destructor Documentation

CSCSegAlgoDF::CSCSegAlgoDF ( const edm::ParameterSet & ps )

explicit

Constructor.

Definition at line 35 of file CSCSegAlgoDF.cc.

CSCSegAlgoDF::~CSCSegAlgoDF ( )

virtual

Destructor.

Definition at line 60 of file CSCSegAlgoDF.cc.

Member Function Documentation

bool CSCSegAlgoDF::addHit	(	const CSCRecHit2D *	hit,
		int	layer
	)

private

Definition at line 416 of file CSCSegAlgoDF.cc.

std::vector< CSCSegment > CSCSegAlgoDF::buildSegments ( const ChamberHitContainer & rechits )

Build track segments in this chamber (this is where the actual segment-building algorithm hides.)

Definition at line 113 of file CSCSegAlgoDF.cc.

void CSCSegAlgoDF::compareProtoSegment	(	const CSCRecHit2D *	h,
		int	layer
	)

private

Definition at line 481 of file CSCSegAlgoDF.cc.

void CSCSegAlgoDF::dumpSegment ( const CSCSegment & seg ) const

private

Definition at line 611 of file CSCSegAlgoDF.cc.

void CSCSegAlgoDF::flagHitsAsUsed ( const ChamberHitContainer & rechitsInChamber )

private

Flag hits on segment as used

Definition at line 526 of file CSCSegAlgoDF.cc.

bool CSCSegAlgoDF::hasHitOnLayer ( int layer ) const

private

Definition at line 461 of file CSCSegAlgoDF.cc.

bool CSCSegAlgoDF::isHitNearSegment ( const CSCRecHit2D * h ) const

private

Definition at line 378 of file CSCSegAlgoDF.cc.

void CSCSegAlgoDF::pruneFromResidual ( void )

private

Prune bad segment from the worse hit based on residuals

Definition at line 551 of file CSCSegAlgoDF.cc.

std::vector< CSCSegment > CSCSegAlgoDF::run	(	const CSCChamber *	aChamber,
		const ChamberHitContainer &	rechits
	)

Here we must implement the algorithm

Definition at line 69 of file CSCSegAlgoDF.cc.

void CSCSegAlgoDF::tryAddingHitsToSegment	(	const ChamberHitContainer &	rechitsInChamber,
		const ChamberHitContainerCIt	i1,
		const ChamberHitContainerCIt	i2,
		const LayerIndex &	layerIndex
	)

private

Utility functions.

Try adding non-used hits to segment
Skip the layers containing the segment endpoints on first 2 passes, but then
try hits on layer containing the segment starting points on 2nd and/or 3rd pass
if segment has >2 hits. Test each hit on the other layers to see if it is near
the segment using rechit error matrix.
If it is, see whether there is already a hit on the segment from the same layer

if so, and there are more than 2 hits on the segment, copy the segment,
replace the old hit with the new hit. If the new segment chi2 is better
then replace the original segment with the new one
if not, copy the segment, add the hit if it's within a certain range.

Definition at line 286 of file CSCSegAlgoDF.cc.

void CSCSegAlgoDF::updateParameters ( void )

private

Definition at line 442 of file CSCSegAlgoDF.cc.

Member Data Documentation

float CSCSegAlgoDF::chi2Max

private

Definition at line 140 of file CSCSegAlgoDF.h.

ChamberHitContainer CSCSegAlgoDF::closeHits

private

Definition at line 120 of file CSCSegAlgoDF.h.

bool CSCSegAlgoDF::debug

private

Definition at line 126 of file CSCSegAlgoDF.h.

double CSCSegAlgoDF::dPhiFineMax

private

Definition at line 137 of file CSCSegAlgoDF.h.

double CSCSegAlgoDF::dRPhiFineMax

private

Definition at line 136 of file CSCSegAlgoDF.h.

float CSCSegAlgoDF::maxRatioResidual

private

Definition at line 141 of file CSCSegAlgoDF.h.

int CSCSegAlgoDF::minHitsForPreClustering

private

Definition at line 128 of file CSCSegAlgoDF.h.

int CSCSegAlgoDF::minHitsPerSegment

private

Definition at line 134 of file CSCSegAlgoDF.h.

int CSCSegAlgoDF::minLayersApart

private

Definition at line 131 of file CSCSegAlgoDF.h.

const std::string CSCSegAlgoDF::myName

private

Definition at line 116 of file CSCSegAlgoDF.h.

int CSCSegAlgoDF::nHitsPerClusterIsShower

private

Definition at line 132 of file CSCSegAlgoDF.h.

CSCSegAlgoPreClustering* CSCSegAlgoDF::preCluster_

private

Definition at line 143 of file CSCSegAlgoDF.h.

bool CSCSegAlgoDF::preClustering

private

Definition at line 127 of file CSCSegAlgoDF.h.

ChamberHitContainer CSCSegAlgoDF::protoSegment

private

Definition at line 122 of file CSCSegAlgoDF.h.

bool CSCSegAlgoDF::Pruning

private

Definition at line 130 of file CSCSegAlgoDF.h.

ChamberHitContainer CSCSegAlgoDF::secondSeedHits

private

Definition at line 123 of file CSCSegAlgoDF.h.

CSCSegFit* CSCSegAlgoDF::sfit_

private

Definition at line 145 of file CSCSegAlgoDF.h.

CSCSegAlgoShowering* CSCSegAlgoDF::showering_

private

Definition at line 144 of file CSCSegAlgoDF.h.

float CSCSegAlgoDF::tanPhiMax

private

Definition at line 138 of file CSCSegAlgoDF.h.

float CSCSegAlgoDF::tanThetaMax

private

Definition at line 139 of file CSCSegAlgoDF.h.

const CSCChamber* CSCSegAlgoDF::theChamber

private

Definition at line 117 of file CSCSegAlgoDF.h.

BoolContainer CSCSegAlgoDF::usedHits

private

Definition at line 118 of file CSCSegAlgoDF.h.

Public Types

Public Member Functions

Private Member Functions

Private Attributes

Detailed Description

Member Typedef Documentation

Constructor & Destructor Documentation

Member Function Documentation

Member Data Documentation