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CMS Global Analysis

Explore the structure of matter using mathematical concepts like the Standard Model and the Higgs concept to understand particle mass. Learn about the CMS at CERN and how collisions of particles help reveal smaller objects. Dive into the global data analysis of peta-scale volumes and the intricate CMS tier structure for advanced particle physics research.

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CMS Global Analysis

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  1. CMS Global Analysis • Oliver Gutsche - Fermi National Accelerator Laboratory

  2. Particle Physics • Describe structure of matter using mathematical concepts: Standard Model • Higgs: concept to describe mass of particles • not discovered yet ➠ LHC Acceleration Deflection • Investigate structure of matter by • Colliding elementary particles • Detecting collision products Collision Higher Energy = Smaller Objects can be “seen” Collision Vacuum Acceleration

  3. LHC and CMS • Large Hadron Collider at CERN, Geneva, Switzerland • Proton-Proton collisions • Beam energy: 7 Terra Electron Volts • 40 t truck hitting wall at 90 MPH • Circumference: 27 km • Compact Muon Solenoid:One of 4 particle collision detectors at the LHC • Width: 22m, Diameter: 15m • Weight: 14,500 t • International collaboration of 2000 physicist

  4. CMS Data Analysis • Estimated number of recorded and simulated events • 2008: 300 million • 2009: 3 billion • Peta-scale data volumes • 2008: 640 TeraByte • 2009: 6400 TeraByte • Collisions occur at 40 MHz • Trigger reduces to 200 Hz • Output contains all recorded detector signals and derived information, called “Event” • Events are analyzed separately (High degree of parallelization) Data recording: 1.8 MB/evt. Simulation: 2.5 MB/evt.

  5. CMS Tier Structure USA • Recorded and simulated events • Distributed across all Tier 1 centers • Tier 1 main function: • Store events on tape for backup • Provide access to events • For extraction of sub-samples of analysis interests • Extracts of recorded and simulated events • Distributed between Tier 2 centers (several replicas) • Tier 2 main function: • Provide access to events • for user analysis • 2000 physicists scattered around the globe want to analyze CMS data • Analysis is location driven • “Job is sent where the data is stored.” • CMS follows GRID approach to distribute data storage and processing world-wide UK Italy France GER Spain CERN • data recording Taiwan 1 Tier 0 7 Tier 1 ~25 Tier 2

  6. Global Data Access USER CRAB • Equal fair share access for all CMS users • User tool: CMS Remote Analysis Builder • Global Data Discovery Services: • Data Bookkeeping Service • Dataset Location Service • GRID submission: • EGEE resource broker submission to all centers • OSG Condor-G submission to OSG T2 GRID Middleware DBS DLS OSG Condor-G submission EGEE Resource Broker T2 centers T1 centers T1 centers

  7. DEMO

  8. Summary & Outlook Simulated Signal • CMS Global Analysis provides all CMS users with access to peta-scale data volumes • distributed world-wide • accessible via GRID structure • Infrastructure achieves current performance goals

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