Status of OpRec

1
Status of OpRec
Antoine Cazes Laboratoire de lAccelerateur
Lineaire
OPERA Collaboration Meeting in Frascatti Physics
coordination meeting. October 28th 2002.
2
Contents

• Pattern
• organization of the program
• the main classes and method
• Tracking ? Kalman
• Resolution
• Future

3
Pattern v4
PatAna

• PatHitBuilder

• PatHitFromTSCIN
• PatHitFromSRPC
• PatHitFromDigit
• PatSegmentInTarget
• PatSegmentInSpectroUp
• PatSegmentInSpectroDw
• PatSegmentConnector
• TrackElementBuilder

• PatAnaXZ

• PatCellBuilderInTarget
• PatSegmentBuilderInTarget
• PatHitFilter
• PatCellBuilderInSpectroUp
• PatSegmentBuilderInSpectroUp
• PatHitFilter
• PatCellBuilderInSpectroDw
• PatSegmentBuilderInSpectroDw
• PatHitFilter

• PatAnaYZ

4
PatSegmentInDetector

• 3 kind of PatSegmentInDetectors
• PatSegmentInTarget
• PatSegmentInSpectroUp
• only Spectro Up hits
• PatSegmentInSpectroDw
• Spectro Down hits
• Drift tube hits form the 6 last planes
• PatSegmentInDetector
• Input PatHit and PatCell list
• PatSegmentList

5
PatHitFromDigit, PatHitBuilder

• 3 kind of PatHitFromDigits
• PatHitFromTSCIN
• PatHtiFromSRPC
• PatHitFromSDT
• PatHitFromDigit (inherit from AlgAnalyserltDigitgt)
  
• indexed 2D point
• plane number
• Specification depending of detector (not used)
• Deposited energy
• Drift time
• etc
• IOData List (could be one digit, or a cluster)
• PatHitBuilder (Steering routine)
• Call all the PatHitFromDigits

6
PatCell, PatCellBuilderInDetector

• PatCell
• 2 PatHits
• Detector name
• Length
• Direction (cos, sin)
• Connected cell List (neighbors in the left)
• Position of the cell
• PatCellBuilderFromDetector
• Create cells (ie connection between two hits)
• Hits in consecutive planes, or if needed, in
  separated planes.
• Cut to avoid unrealistic cells (depending on
  detector)
• Create a list of cells with all the reasonable
  connections to build the segments

7
PatSegment

• PatSegment
• PatHit list
• PatCell list
• Length
• 2 Slopes
• Fit to a straight line OR
• Tangent to a parabola at both side of the segment
  (In Spectro)

• Elasticity (? ?2 of the fit)
• Mean diffusion angle
• Quality
• Detector name (should disappear)

8
PatSegmentConnector / TrackElement

• Select a connection strategy using track quality
  criteria
• Spectro Up to Spectro Down connection connect
  the result to Target
• Spectro Down to Target connection recover the
  Spectro Up hits on the trajectory.
• Spectro Down to Spectro Up connection recover
  the Target hits on the trajectory.
• Extrapolate the trajectory using the Spectro
  Down segment and recover the Spectro Up and
  Target hits on it.
• Recover the drift tube hits from the 12 first
  drift tube planes.
• Build the segments that are only in the Target
  and the Spectro Up
• store the fully contain in target track.

9
TrackElement

• TrackElement
• Output of the Pattern contains the list of
  digit (IOData) of the segment.

Event 822
10
Tracking

• Merge the 2 longest projection tracks into one
  3D track
• Do the Kalman Fit on this track
• Take into account multiple scattering and dE/dx
• Input parameters
• MC spectro information OR
• last points of the track (if it doesnt exit the
  target)
• Outputs
• X, Y
• tanqx tanqy
• correlation matrix.
• Do a simple 2D fit on the other tracks.
• Outputs
• X (or Y)
• tanqx (or tanqy)

11
Angular and spatial resolution versus momentum
Diff. Between true value at first point in the
Target and the value obtained by the fit. No cuts
on muon Id and energy.
nm CC DIS t?m DIS t?m QE
12
Future

• Pattern
• Continue the implementation under OpAlgo (some
  improvement could be done with inheritance
  structure)
• A Note will be written
• Tracking
• implementation under OpAlgo
• Tracking in the spectrometer.