Welcome to the Track Fitting task pages

Mission Statement: Track Parameters and Covariance Matrix for Online and Offline Applications

The Tracking task include the following activities: (Alignment should become a seperate activity):

1. Track Event Model
2. Track Fitting Algorithms
3. Track Extrapolation
4. Alignment Issues
5. Composite Particle and Secondary Vertex Reconstruction

Approach:

• Activities include both online and offline applications
• Monitoring tools and quality checkers are implicitly included

Related Links:

Boole , Brunel , DaVinci , Visualisation

Access to CVS code repository

In the tables below a summary of the activities is given. The idea is to expand for topics into a TWiki page of their own. So, please fell free to add to these pages.

1. Track Event Model

People:

• O.Callot, M.Cattaneo, J.A.Hernando, M.Merk, P.Koppenburg, G.Raven, E.Rodrigues

Requirements for the event model:

See the Track Model Task Force pages, defining tracks, trajectories, states and measurements

Implementation of the Event Model:

_Subject_	_Contact_	_Code_	_Documents_	_Comments_
Design review (2000)	M.Needham, J.v.Tilburg, M.Merk		designreview.ps
Status 2003	J.v.Tilburg		talk_Nov_20_2003
Tr vs Trg track Model	J.A. Hernando, E.Rodrigues, J.v.Tilburg	Event/TrEvent & Tr/TrFitEvent vs Event/TrgEvent	talk_Nov_20_2003, talk_June_1_2004
Status 2005	E.Rodrigues, J.A.Hernando	Event/TrackEvent & Tr/TrackFitEvent	Eduardo's Page , doxygen

2. Track Fitting Algorithms

Deliverables:

• Algorithms to estimate Track Parameters and Covariance for Charged Tracks
• Performance Estimation Tools using MC truth: "Checkers"
• Performance Estimation Tools using reco objects: "Monitors"

Inputs:

• Tracks Found by the Pattern Recognition algorithms in particular lists of assigned Velo, ST clusters and OT times

People:

• M.Benayoun, E.Bos, J.A.Hernando, M.Merk, M.Needham, C.Parkes, E.Rodrigues, H.Ruiz, J.v.Tilburg, Y. Xie, ...

Offline Kalman Track Fit:

• A list of topics relevant in the offline Kalman filter trackfit

_Subject_	_Contact_	_Code_	_Documents_	_Plots_	_Comments_
Kalman fit	E.Rodrigues, J.A.Hernando	Tr/TrFitter	LHCb-2000-086, LHCb-2001-021
Electron Fit	M.Needham		LHCb-2001-102		dedicated electron fit or not?
Seeding the Kalman Fit	J. v.Tilburg		talk_Oct08_2002
Reference Trajectory	J.v.Tilburg		talk_Nov20_2003
Outlier Removal	J.v.Tilburg		talk_Nov20_2003
"Two Way" Kalman Filter Fit
Velo Clusters in Kalman Fit	Velo Group, M.Merk	Tr/TrFitEvent			Cluster Position and Error parametrization
ST Clusters in Kalman Fit	M.Needham	Tr/TrFitEvent
OT Times in Kalman Fit	C.Parkes	Tr/TrFitEvent
Using RICH slopes in the Fit	M. Benayoun
Parameter Tuning	J.v.Tilburg, M.Merk		talk_Nov_20_2003 talk_April6_2004

_Note: for the new event model the code in Tr/TrXxxx becomes Tr/TrackXxxx_

Online Fit:

• A list of topics relevant for online parameter estimation

_Subject_	_Contact_	_Code_	_Documents_	_Comments_
Online Parameter Estimation	H.Ruiz		talk_March16_2005 , talk_March21_2005
Fast Kalman Fit	J.v.Hunen

Performance Estimation Checkers:

In the checkers the performance is evaluated by comparison with MC truth.

_Subject_	_Contact_	_Code_	_Documents_	_Plots_	_Comments_
Offline Resolution and Pulls	M.Merk, Y.Xie		talk_April6_2004, talk_May18_2004 , talk_Sep13_2004
Large NTuple	M.Merk	Tr/TrCheck/PatternChecker			Does not work directly with root persistency?
Small NTuple	J.v Tilburg	Tr/TrCheck/TrTupleChecker
General Histos	J.v.Tilburg	Tr/TrCheck/TrChecker
Track Slopes in the RICH	G.Wilkinson, M.Benayoun		LHCb-2001-100	RTDR 1
Robustness Tests	M.Merk, M.Needham		LHCb-2003-030 , LHCb-2003-017, LHCb-2003-020	RTDR 1, 2, 3

_Note: for the new event model the code in Tr/TrXxxx becomes Tr/TrackXxxx_

Performance Estimation Monitors:

In the monitors the performance is evaluated using information in the data.

_Subject_	_Contact_	_Code_	_Documents_	_Plots_	_Comments_
Offline Track Monitoring		Tr/TrCheck/TrMonitor

_Note: for the new event model the code in Tr/TrXxxx becomes Tr/TrackXxxx_

Visualisation

_Subject_	_Contact_	_Code_	_Documents_	_Plots_	_Comments_
Track Visualisation	J.v.Tilburg		talk_Mar31_2003	RTDR 1
Scoring Planes					Do we need "scoring planes for display purposes?

3. Track Extrapolation

Deliverables:

• Track Extrapolation with full offline precision
• Fast online track extraplation

Inputs:

• TrackTrack, TrackState

People: E. Bos, G.Corti, J.A.Hernando, J.v. Hunen, M.Merk, M.Needham, E. Rodrigues, ...

Extrapolator:

_Subject_	_Contact_	_Code_	_Documents_	_Comments_
General Tool	J.A.Hernando, E.Rodrigues	Tr/TrExtrapolators
Bfield map	F.Teubert, M.Losasso, G.Corti	Field045	talk_Mar31_2003	Is the precision sufficient
Magnetic field steppers	G.Corti, M.Needham, M.Merk			Systematic differences in GEANT and Reconstruction
Transport Service Precise Implementation Fast Implementation	I.Belyaev ? J.v.Hunen		. . talk_Nov20_2003	Which transporter in DaVinci?
Extrapolation in the Velo and B field	M.Merk, J.v.Tilburg		talk_Sep17_2002 ,talk_Oct08_2002
Implementing non-ideal geometry	J.Nardulli, E.Bos

_Note: for the new event model the code in Tr/TrXxxx becomes Tr/TrackXxxx_

4. Alignment Issues

This should become a seperate project

Deliverables:

• Implementation of Misalignments in the MC
• Determining the detector misalignment
• Track fitting with a misaligned detector

People:

• W.Bell, E.Bos, M.Merk, J.Nardulli, M.Needham, D.Petrie, J.v.Tilburg, K.Vervink,...

Links:

• First Discussions during the Software Week March 19 2003 on Alignment and Calibration
• J. Palacios Alignment Studies of the Velo
• M.Needhams ST/OT Alignment page.

Implementing Misalignments

_Subject_	_Contact_	_Code_	_Documents_	_Comments_
The coordinate LHCb system			coordinates.pdf, LHCb Reference Frame
Alignment Class	W.Bell		talk_Nov19_2003
Alignment in other HEP experiments	D.Petrie		talk_Nov19_2003
Alignment and trackfit ideas	J.v.Tilburg		talk_Mar31_2003
Effects of Misalignments in Velo
Effects of Misalignments in ST
Effects of Misalignments in OT	J.Nardulli		LHCb-2006-020

Determining the alignment

_Subject_	_Contact_	_Code_	_Documents_	_Comments_
Alignment in other HEP experiments	D.Petrie		talk_Nov19_2003
Alignment and trackfit ideas	J.v.Tilburg		talk_Mar31_2003

5. Composite Particle and Secondary Vertex Reconstruction

Deliverables

• Inclusive and vertex search algorithms
• Vertex Fitting algorithm
• Exclusive secondary vertex searches:
  • J/psi,
  • phi
  • Ks,
  • D(s)(*)
  • V0
• Performance Monitoring tools

Inputs

People

• ...

-- MarcelMerk - 08 Apr 2005