Status of OpRec Antoine Cazes Laboratoire de l’ Accelerateur Lineaire OPERA Collaboration Meeting in Frascatti Physics coordination meeting. October 28 th 2002.

Antoine Cazes OPERA collaboration meeting Physics coordination - 10/28/2002 Contents  Pattern : organization of the program the main classes and method  Tracking  Kalman  Resolution  Future

Antoine Cazes OPERA collaboration meeting Physics coordination - 10/28/2002 Pattern v4: PatAna  PatHitBuilder  PatHitFromTSCIN  PatHitFromSRPC  PatHitFromDigit  PatSegmentInTarget  PatSegmentInSpectroUp  PatSegmentInSpectroDw  PatSegmentConnector  TrackElementBuilder  …  PatCellBuilderInTarget  PatSegmentBuilderInTarget  PatHitFilter  PatCellBuilderInSpectroUp  PatSegmentBuilderInSpectroUp  PatHitFilter  PatCellBuilderInSpectroDw  PatSegmentBuilderInSpectroDw  PatHitFilter  PatAnaYZ  PatAnaXZ

Antoine Cazes OPERA collaboration meeting Physics coordination - 10/28/2002 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

Antoine Cazes OPERA collaboration meeting Physics coordination - 10/28/2002 PatHitFromDigit, PatHitBuilder  3 kind of PatHitFromDigits: PatHitFromTSCIN PatHtiFromSRPC PatHitFromSDT  PatHitFromDigit ( inherit from AlgAnalyser ) 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

Antoine Cazes OPERA collaboration meeting Physics coordination - 10/28/2002 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

Antoine Cazes OPERA collaboration meeting Physics coordination - 10/28/2002 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 (   of the fit) Mean diffusion angle Quality Detector name (should disappear)

Antoine Cazes OPERA collaboration meeting Physics coordination - 10/28/2002 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.

Antoine Cazes OPERA collaboration meeting Physics coordination - 10/28/2002 TrackElement TrackElement : Output of the Pattern: contains the list of digit (IOData) of the segment. Event 822

Antoine Cazes OPERA collaboration meeting Physics coordination - 10/28/2002 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 doesn’t exit the target)  Outputs X, Y tan  x tan  y correlation matrix.  Do a simple 2D fit on the other tracks.  Outputs X (or Y) tan  x (or tan  y )

Antoine Cazes OPERA collaboration meeting Physics coordination - 10/28/2002 Angular and spatial resolution versus momentum  CC DIS  DIS  QE Diff. Between true value at first point in the Target and the value obtained by the fit. No cuts on muon Id and energy.

Antoine Cazes OPERA collaboration meeting Physics coordination - 10/28/2002 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.