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KLOE offline/MC status report

KLOE offline/MC status report. M. Moulson 32nd LNF Scientific Committee Frascati, 1 June 2006. Offline/MC tasks for 2006. Establish definitive KLOE data set: Close holes in reconstruction/DST coverage Reprocess various data sets Most critical is 2004 data with bad dead-wire maps:

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KLOE offline/MC status report

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  1. KLOE offline/MC status report M. Moulson 32nd LNF Scientific Committee Frascati, 1 June 2006

  2. Offline/MC tasks for 2006 • Establish definitive KLOE data set: • Close holes in reconstruction/DST coverage • Reprocess various data sets • Most critical is 2004 data with bad dead-wire maps: • Due to DB problem, hits deleted on falsely declared “dead” wires (up to 4% of DC) in 645 pb-1 of reconstructed data • Survey data quality for MC production and analysis • Produce large-scale MC samples for 2004-2005 data

  3. KLOE MC upgrades for 2004-2005 • Map of 2004/2005 machine and trigger conditions • New (post-2003) IR geometry • Better parameterizations of EmC response • Time, energy resolution; cluster efficiencies • Improved treatment of nuclear interactions/regeneration in DC wall and beam pipe • New secondary decay generators • KS p+p-e+e-, h  p+p-e+e-,e+e- wp0 • Inserted background from events acquired with random trigger • Simulation of noise correlated to K tracks • Simulation of dE/dx measurement in DC

  4. Background from random triggers • EmC and DC hits from random events inserted in proportion to Linst • EmC hits require careful MC/data timescale alignment • Special treatment for “noise” hits on EmC (missing tA or tB) • Cluster time distributions • (t0from KS secondaries) ~3% of clusters in tail (t < 0) • data • MC KS  p0p0, KL crash Overall accidental level MC/data = 1.05 tcl(ns) • KS  p+p-, KL crash • Overall accidental level • MC/data = 1.19 • Track reconstruction efficiency higher in MC when t0 incorrect tcl(ns)

  5. etrk+vtx as a function of t*(K±) + e(MC) + e(data) before after t*(K±) (ns) t*(K±) (ns) Simulation of noise hits for K± tracks • Sample distribution of K-correlated background hits in: • layer, distance (in wires) from reconstructed track, time Private reconstruction of ~20 pb-1 of 2002 MC events to study how new background parameterization affects MC tracking efficiency

  6. dE/dx distribution Truncated mean distribution Kp2 sample Kp2 sample • data • MC Km2 sample Km2 sample dE/dx (count/cm) dE/dx (count/cm) Simulation of DC dE/dx measurement • DE distribution rescaled and smeared to match data • Different s-t relations  effective integration gates for data/MC • Difficulties in calibrating for track inclination (space-charge effects?) dE/dx resolution adequate for K ID, but not e.g. Ke2/Km2 separation

  7. Monte Carlo production plans Averaged over entire MC sample: 0.21M evts/B80 day = 2.4 Hz 0.41 s/evt (simulation + reconstruction + DST) Estimated time for 2004-2005 MC 2001-2002 MC production f  all, scale = 0.2 KSKL, scale = 1 K+K-, scale = 1 f radiative, scale = 5 Other (1M evts/pb-1) Total: 3.1M evts/pb-1 (about same as number of f decays in data)

  8. Monte Carlo production status • 350 pb-1f all events (2005 data) produced in 2006 for tests • Thorough shakedown of new features in MC • Rigorous procedural test: performance of DH system • Real production to begin next week • f all, KSKL, K+K- campaigns to be combined: all_phys, L scale 1.2 • Start with 2005 data: Reprocessing not necessary for comparison

  9. Offline resources: CPU • KLOE CPU accounting is performed in B80 units • 1 “B80 CPU” = 1 P3 CPU installed in B80 server • Uncertainties transferred to B80/P4+ and B80/P5 ratios • “MC” estimates based on MC tests conducted May 2006 • “CW” estimates based on past experience

  10. Offline CPU needs Assuming: 294 B80 total (MC test, not CW) 80 B80 left to users for analysis 214 B80 for offline 9-12 months if there are no serious DH problems

  11. Offline resources: Disk space DSTs cached on nfs-mounted disks for fast analysis access DST volume* *Updated to account for scan data • Current DST cache capacity: 12 TB • New purchases: 21 TB FC disk + new controller • Gara closed at beginning of May • Order to be approved by Giunta next week, delivery by end of June? ~30 TB available for disk cache

  12. Offline resources: Tape library Tape library usage (TB) • Final estimate includes: • Closing of holes in datarec/DST coverage • MC for ’04-’05 data • Library capacity: • Currently 810 TB • 600 new cassettes added at start of year • Expandable to 1400 TB • (1400/3600 slots in use in new library) Current capacity 810 TB 536 955 Will need 145 TB of additional cassettes to finish MC production 400 new cassettes (120 TB) already financed

  13. Outlook and summary • Start of MC production delayed to include improvements to background simulation • MC production for 2005 data (all_phys, L scale 1.2) ready to start • Once MC production underway, will begin reprocessing 2004 data with bad wire maps • We have the CPU power needed to generate a definitive MC sample and reprocess as necessary on a time scale compatible with beginning of 2007 • We will probably want to expand DST disk cache • We will need new cassettes towards the end of 2006

  14. Reconstruction of 2004-2005 data Updated to reflect DB work 21 Mar 06 Runs 28700 (9 May 04) to 41902 (5 Dec 05) 1970 1930 1740 990 1480 1520 1480 pb–1

  15. Reconstructed KLOE data trgmon luminosity in pb-1 by year and DBV 645 pb-1 to be reprocessed for sure,278 pb-1(617 pb-1) as time permits

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