First Ideas on OO Track Fit

1
First Ideas on OO Track Fit

• Track Fit
• Data Required by Track Fit
• First thoughts on Needed Classes
• 
  Gonzalo Gracia
• 
  01/09/98

2
Track Fit

• Track Fit
• Track Finding
• Track Seeding
• Track Following
• Local Pattern Recognition
• Global Pattern Recognition
• Track Fitting
• I assume calibrations, alignment and
  digitisations are done

3
Data needed

• Hits
• Wire Id -ADC/channel
• Drift time
• (alignment and calibration)
• Wire Position - Cluster CoG
• Error - Error
• Distance to Wire - Cluster Size,ADC/channel
• Cell size, stereo angle, reference to MC Track
• and Hit

4
Data Needed (3)

• Vertex Hits (and/or track segments)
• Hits per plane, with errors
• track segments from VTX pattern recognition
• Muon Hits (and/or track segments)
• Hits per plane, with errors
• Track segments
• Field map Field _at_ X,Y,Z
• MC track
• Parameters
• Hits in Track

5
Data Needed (4)

• Volumes
• Geometry
• Materials
• We need to know if a track extrapolated from
• Z to Z goes through some material

6
Track Users

• Analysis
• Event Display
• RICH
• CALORIMETERS
• TRIGGER
• Track Propagation
• Very general Track Class with (many?) inherited
  subclasses

7
Track Classes (1)

• Class Track
• Track Parameters (X,Y,Z, SlX, SlY, P)
• trackPropagate
• trackDisplay
• MC Track (inherited from Track)
• Momentum
• Particle Id
• Hits in the track
• Fit Track (inherited from Track)
• Error Matrix

8
Track Classes (2)

• AnalysisTrack (inherited from fitTrack)
• Particle Id
• Chi Squared
• trackSegment (inherited from fitTrack)
• Nodes
• TrackFitter
• tr trackSegment(TrackFitter)

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Node Class

• TrackState
• Hits (Sensitive Planes)
• DriftChamberHit
• StripChamberHit
• VertexHit
• Projector (of hit into track parameters)
• Walls
• Thick Walls
• Thin walls

10
Data Needed (1)

• Hits
• Wire Id -ADC/channel
• Drift time
• (alignment and calibration)
• Wire Position - Cluster CoG
• Distance to Wire - Error
• Error - Cluster
  Size,ADC/channel
• Cell size, stereo angle, reference to MC Track
• and Hit

11
Data Needed (2)

• Generic algorithm
• Loop over stations
• loop over layers
• loop over hits in layer
• Hits are needed monolayer by monolayer
• (sometimes only in a particular region of the
• layer)

12
Track Manager (1)

• Find Track Seeds
• Kalman filter in stations 8-11 (or other fit)
• Muon segments
• Vertex detector segments
• Calorimeter
• Follow Tracks
• Find compatible segments in the other stations
• Global Fit
• Find Track Seeds with remaining hits
• Particle Id

13
Track Manager (2)

• Once the tracks are found and fitted
• Get a particular track
• Refit track with a particular algorithm
• Get Tracks with Particle Id