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:

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
  . 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:

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

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Topic revision: r26 - 2007-01-24 - EduardoRodrigues
 
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