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STAR reconstruction overview

Explore the similarities and differences between STAR and ALICE collaborations, focusing on detector configurations, software design challenges, and future plans for data reconstruction. Join the discussion on integration tasks, algorithm streamlining, and collaborative efforts to enhance data analysis capabilities.

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STAR reconstruction overview

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

  2. 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 STAR/ALICE Joint Software Workshop

  3. 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 STAR/ALICE Joint Software Workshop

  4. 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 STAR/ALICE Joint Software Workshop

  5. 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 STAR/ALICE Joint Software Workshop

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

  7. Global reconstruction • Integrates detector specific info • Writes DSTs STAR/ALICE Joint Software Workshop

  8. 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 ...) STAR/ALICE Joint Software Workshop

  9. 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 STAR/ALICE Joint Software Workshop

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