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Last update: Apr 1, 2000

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New Data Analysis Environment in H1

Christoph Grab1, Ralf Gerhards2, Ursula Berthon3, Thomas Benisch2, Thomas Hadig4, Pierre van Mechelen5
  1. DESY/ ETH-Zuerich
  2. DESY
  3. Ecole Polytechnic Paris
  4. RWTH-Aachen
  5. Univ. Antwerpen

Speaker: Ursula Berthon

  The electron proton collider HERA at the DESY laboratory in Hamburg and the H1 experiment are performing substantial upgrades during the years 2000 and 2001. To cope with this expected increased luminosity and therefore the increased demands on data storage and data handling for analysis, the H1 Collaboration is pursuing a major revision of its computing environment.
   To optimize the efficiency and speed up the turn around for offline data analysis, we enhance our present sequential model of data analysis (characterized by sequential steps, ntuple production and PAW analysis) by setting in place a new direct, interactive and user-friendly analysis framework.
   This framework builds on top of a new data storage model optimized for fast data access, that foresees a four tier model: the lowest level consists of the RAW data stored on tape, the second level consists of the so called ODS (object data system), that basically contains all standard reconstructed entities, such as tracks and clusters. The third tier is micro-ODS that contains high-level particle objects on the 4-vector level. The top tier finally is a tag event database, which allows dynamic event selection based on kinematical and topological event topologies. H1 has adapted RooT as the tool of choice for a compact framework to do the H1 data I/O, to perform physics analysis, and to interactively display events.
   We present the general strategy for physics analysis pursued by the H1 experiment and related implementation issues. We report on the results of prototyping ROOT-based analyses and some performance benchmarks.

Presentation:  PowerPoint Short Paper:  Adobe Acrobat pdf 

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