LEPTrackingProcessor Class Reference

Produces Track collection from TPC TrackerHit collections using LEP tracking algorithms. More...

#include <LEPTrackingProcessor.h>

Inheritance diagram for LEPTrackingProcessor:

Public Member Functions
virtual Processor *	newProcessor ()
virtual void	init ()
	Called at the begin of the job before anything is read. More...
virtual void	processRunHeader (LCRunHeader *run)
	Called for every run.
virtual void	processEvent (LCEvent *evt)
	Called for every event - the working horse.
virtual void	check (LCEvent *evt)
virtual void	end ()
	Called after data processing for clean up.
void	selectTPCHits (LCCollection *tpcTHcol, LCCollectionVec *remainingCol, LCCollectionVec *cutCol, int binHeight, int binWidth, float zmin=-10000., float zmax=+10000.)
	Used to remove problematic TPC hits from Curlers.
void	selectTPCHits (LCCollection *tpcTHcol, LCCollection *usedCol, float zmin=-10000., float zmax=+10000.)
	Used to send all hits to the patrec.
void	FillTPCHitBanks ()
	Used to fill TPC hits into the hit banks for F77.

Protected Attributes
std::string	_colNameTPC
	Input collections name.
std::string	_colNameVTX
std::string	_colNameSIT
std::string	_colNameTPCTracks
std::string	_colNameTracks
std::string	_colNameMCTPCTracksRel
std::string	_colNameMCTracksRel
std::string	_usedColName
std::string	_droppedColName
LCCollectionVec *	_tpcTrackVec
LCCollectionVec *	_tpclcRelVec
LCCollectionVec *	_usedCol
LCCollectionVec *	_droppedCol
LCCollectionVec *	_usedColForOutput
LCCollectionVec *	_droppedColForOutput
int	_nRun
int	_nEvt
int	_binHeight
int	_nSlicesInZ
int	_binWidth
int	_multiplicityCut
int	_AlwaysRunCurlKiller
std::vector< EVENT::TrackerHit * >	_goodHits
std::vector< EVENT::TrackerHit * >	_savedGoodHits
int	_histograms
TH1F *	fTPCR
TH1F *	fTPCRRaw
TH1F *	fTPCZ
TH1F *	fTPCZRaw
TH2F *	fTPCRZ
TH2F *	fTPCXYRaw
TH2F *	fTPCXY
TH2F *	fTPCRZRaw

Detailed Description

Produces Track collection from TPC TrackerHit collections using LEP tracking algorithms.

The Geometric information via GEAR. The f77 tracking code previously relied on ZEBRA banks, these have been replace by C++ structures implemented in tkhitbank.h etc. There must be instanitated and deleted at the begining and the end of the processor respectively.

Currently only the TPC patrec and fitting is implemented, though plans to incorporate VTX hits into Tracks exist.

The name of the TPC Track collection is specified in the steering file, togeather with the name of the hit collections needed as input.

For the track collection the following applys:

The reference point is the Point of Closest Approach.

All parameters are defined there.

Phi is defined between -PI and +PI

Z0 is the z coordinate of the PCA in the R-Phi plane.

For the relations, the weighs are calculated as the percentage of hits that a given MC particle contributes to the reconstucted track's hit collection

At present the covariance matrix is not filled.

The LEP algorithms are taken from Brahms but does not contain the DELPHI ambiguity resolver. The track finding is based on 1) SUBROUTINE CIRCLE (N.CHERNOV, G. OSOSKOV ) REFERENCE: COMPUTER PHYSICS COMMUNICATIONS VOL 33,P329 2) 3-DIMENSIONAL ITERACTION (MARTIN POPPE) REFERENCE: ALEPH NOTE 87-102

The final track fitting is done using a Kalman filter. At present the both the magnetic field and the material desciption of the TPC is hard coded into the Fortran code and C++ code, and will be improved when GEAR becomes more evolved.

Input collections and prerequisites

Processor requires collection of digitized TPC tracker hits. If such a collections with the user specified names do not exist processor takes no action. Processor still attempts to assign VTX and SIT tracker hits to the found TPC tracks and produce combined Si-TPC tracks. Hence, optionally an user can provide the names of the VTX and SIT tracker hit collections. A more efficient algorithm of combining information from TPC and silicon detectors

Output

Processor produces collection of TPC tracks

Parameters

TPCTrackerHitCollectionName	Name of the TPC TrackerHit collection (default value is TPCTrackerHits)
VTXTrackerHitCollectionName	Name of the VTX TrackerHit collection (default value is VTXTrackerHits)
SITTrackerHitCollectionName	Name of the SIT TrackerHit collection (default value is SITTrackerHits)
TPCTrackCollectionName	Name of the output TPC Track collection (default value is TPCTracks)
TrackCollectionName	Name of the combined Si-TPC Track collection (default value is Tracks)
MCTPCTrackRelCollectionName	Name of the TPC Track MC Relation collection (default value is TPCTracksMCP)
MCTrackRelCollectionName	Name of the Track MC Relation collection (default value is TracksMCP)

Authors

S. Aplin, DESY, A. Raspereza MPI-Munich

Member Function Documentation

virtual void LEPTrackingProcessor::init ( )

virtual

Called at the begin of the job before anything is read.

Use to initialize the processor, e.g. book histograms.

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The documentation for this class was generated from the following file:

• LEPTrackingProcessor.h