Status of Op Rec Antoine Cazes Laboratoire de

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

Contents ØPattern : organization of the program the main classes and method ØTracking Kalman Ø Resolution ØFuture Antoine Cazes OPERA collaboration meeting Physics coordination - 10/28/2002

Pattern v 4: Pat. Ana Pat. Hit. Builder Pat. Hit. From. TSCIN Pat. Hit. From. SRPC Pat. Hit. From. Digit Pat. Ana. XZ Pat. Segment. In. Target Pat. Cell. Builder. In. Target Pat. Segment. Builder. In. Target Pat. Hit. Filter Pat. Segment. In. Spectro. Up Pat. Cell. Builder. In. Spectro. Up Pat. Segment. Builder. In. Spectro. Up Pat. Hit. Filter Pat. Segment. In. Spectro. Dw Pat. Cell. Builder. In. Spectro. Dw Pat. Segment. Builder. In. Spectro. Dw Pat. Hit. Filter Pat. Segment. Connector Track. Element. Builder Pat. Ana. YZ Antoine Cazes … OPERA collaboration meeting Physics coordination - 10/28/2002

Pat. Segment. In. Detector Ø 3 kind of Pat. Segment. In. Detectors: Pat. Segment. In. Target Pat. Segment. In. Spectro. Up • only Spectro Up hits Pat. Segment. In. Spectro. Dw • Spectro Down hits • Drift tube hits form the 6 last planes ØPat. Segment. In. Detector Input Pat. Hit and Pat. Cell list Pat. Segment. List Antoine Cazes OPERA collaboration meeting Physics coordination - 10/28/2002

Pat. Hit. From. Digit, Pat. Hit. Builder Ø 3 kind of Pat. Hit. From. Digits: Pat. Hit. From. TSCIN Pat. Hti. From. SRPC Pat. Hit. From. SDT Ø Pat. Hit. From. Digit (inherit from Alg. Analyser<Digit>) indexed 2 D point plane number Specification depending of detector (not used) • Deposited energy • Drift time • etc… IOData List (could be one digit, or a cluster) ØPat. Hit. Builder (“Steering routine”) Call the Pat. Hit. From. Digits Antoine Cazes OPERA collaboration meeting Physics coordination - 10/28/2002

Pat. Cell, Pat. Cell. Builder. In. Detector Ø Pat. Cell 2 Pat. Hits Detector name Length Direction (cos, sin) Connected cell List (neighbors in the left) Position of the cell Ø Pat. Cell. Builder. From. Detector 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

Pat. Segment ØPat. Segment Elasticity ( 2 of the fit) Pat. Hit list Mean diffusion angle Pat. Cell list Quality Length Detector name (should disappear) 2 Slopes • Fit to a straight line OR • Tangent to a parabola at both side of the segment (In Spectro) Antoine Cazes OPERA collaboration meeting Physics coordination - 10/28/2002

Pat. Segment. Connector / Track. Element Ø 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. Ø Recover the drift tube hits from the 12 first drift tube planes. Ø Build the segments that are only in the Target and the Spectro Up Ø store the fully contain in target track. Antoine Cazes OPERA collaboration meeting Physics coordination - 10/28/2002

Track. Element : 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 Ø Merge the 2 longest projection tracks into one 3 D track Ø Do the Kalman Fit on this track Take into account multiple scattering and d. E/dx Input parameters: • MC spectro information OR • last points of the track (if it doesn’t exit the target) Ø Outputs X, Y tanqx tanqy correlation matrix. Ø Do a simple 2 D fit on the other tracks. Ø Outputs X (or Y) tanqx (or tanqy) Antoine Cazes OPERA collaboration meeting Physics coordination - 10/28/2002

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

Future ØPattern : Continue the implementation under Op. Algo (some improvement could be done with inheritance structure) A Note will be written ØTracking implementation under Op. Algo Tracking in the spectrometer. Antoine Cazes OPERA collaboration meeting Physics coordination - 10/28/2002