STAR reconstruction overview Spiros Margetis (Kent State University) STAR Collaboration.

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Presentation transcript:

STAR reconstruction overview Spiros Margetis (Kent State University) STAR Collaboration

8 April 2000STAR/ALICE Joint Software Workshop Introduction STAR is similar to ALICE –Collider Environment –Barrel TPC as central tracker –Silicon based Vertex Detectors STAR (SSD+SDD) ALICE (+Pixel) –Common reconstruction tasks Cluster/Hit/Track finders/fitters Global combinators (tracks, PID, vertices) Calibrations, Alignment, Controls

8 April 2000STAR/ALICE Joint Software Workshop STAR Year-1 / Year-2 Year-1 tracking detectors –TPC + one SVT plane (ladder) + FTPC Simpler integrated tracking tasks –Material, trackers, matching, relative alignments Year-2, 2’,2”... configuration –Initially + SVT, then +SDD Harder integrated tracking tasks Execution sequence less obvious –Detector Global handshake

8 April 2000STAR/ALICE Joint Software Workshop Software design - Bad news Poor Initial Design –Legacy code was put together and effort concentrated in maintenance and algorithm development New environment, new challenges –Minimum (STAR dedicated) manpower/frequent infra changes (much better now) Co-existence of Fortran/C++ –makers and pams Different code, same task Black box/Don’t touch approach

8 April 2000STAR/ALICE Joint Software Workshop Good news Good algorithmic approaches to cluster/track finding –Based on previous experiments Basic tasks are covered even if not in an optimum way –No huge holes in the system Currently looking for common tasks –Propagation (GEANE …) –Fitting (Kalman …) –Algorithm handshake/streamlining/integration

8 April 2000STAR/ALICE Joint Software Workshop TPC (similar chart for SVT) All data are reported in STAR coor. Syst.

8 April 2000STAR/ALICE Joint Software Workshop Global reconstruction Integrates detector specific info Writes DSTs

8 April 2000STAR/ALICE Joint Software Workshop Plans Short term –Keep tuning / develop existing code –Profit from other’s experience –Do the best we can for upcoming data Longer term –Get rid of legacy –Unify Analysis/Reco framework (StEvent...)

8 April 2000STAR/ALICE Joint Software Workshop Summary STAR will be ready to reconstruct its day- one data, but sweating Year-2 is more challenging than year-1 There is hope for increased participation in developing/rewriting code as data/analysis needs appear. Need collaboration with outside experts