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Exploring CP Violation in B Meson Decay Channels: LHCb Data Storage Challenge

The project led by Glenn Patrick at LHCb aims to study CP violation by analyzing B meson decay channels. The production center processes and stores the data, with AOD and TAG data shipped to other centers. CERN serves as the production center for real data, while regional centers handle simulated data. Simulation plays a key role in generating signal events, with the goal of simulating 10 times more events than real data. The team faces challenges with managing data volumes, background simulations, and limited CPU capacity. The project involves tracking, digitizing, and reconstructing massive amounts of data, requiring clever strategies to handle the workload efficiently.

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Exploring CP Violation in B Meson Decay Channels: LHCb Data Storage Challenge

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  1. LHCb Data StorageGlenn Patrick 06.06.00 LHCb will study CP violation by measuring the various decay channels of the B meson. Baseline model • Production centre processes and stores all of the generated data (ie. RAW,ESD,AOD and TAG). • Only AOD and TAG data shipped to other centres. • CERN is the production centre for real data. • Regional centres (eg. CLRC) are production centres for simulated data archive produced MC data. Glenn Patrick

  2. Simulation Dominates SignalAim for simulated events~10 x real events. Number of reconstructed events depends on B decay channel. For Bd D*, expect 106 events/year…. so need 107 MC events/year plus background just for this channel. BackgroundAim for simulated events~real events. 1012 bb pairs produced each year with a trigger efficiency of 10-3. Implies that 1012 MC events need to be tracked, digitised and triggered with 109 of these events reconstructed. Need to be clever….. Limited by cpu capacity. Glenn Patrick

  3. LHCb Data Volumes Real Data (from 2005) RAW 100kB/event x 109 100 TB ESD 100kB/event x 109 100 TB AOD 20kB/event x 109 20 TB TAG 1kB/event x 109 1 TB Simulated Data (per production of 109 events)RAWmc 200kB/event x 109 200 TB Generator 12kB/event x 109 12 TB ESDmc 100kB/event x 109 100 TB AODmc 20kB/event x 109 20 TB TAGmc 1kB/event x 109 1 TB Glenn Patrick

  4. Very Initial CLRC Estimates • 2001 2002 2003 2004 2005+ • AOD TAG - - - - 84TB/yr • (imported real... 21TBx4 times/year from 2005) • AODmc,TAGmc,Gen 1TB 3TB 5TB 20TB 132TB/yr • (imported MC... 33TBx4 times/year from 2005) • RAWmc,ESDmc, 2TB 10TB 20TB 33TB 84TB/yr • AODmc,TAGmc,Gen • (generated MC 5x106 2x107 6x107 1x108 2.5x108 assumed • in CLRC/UK) events. • Aim for active analysis (AOD,TAG) datasets on disk with • tape used for archival of RAW,ESD,etc? • Some ESD data(10%) needed in first year? • EU Grid Application(MAP/RAL) needs 3.3TB+ in 2002. Glenn Patrick

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