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Offline Report

Offline Report. P. de Simone 24 September 2001. Outline: Status update DST Proposal. Processing of summer 2001 data. LAB integrated luminosity. 51 pb -1. 7.3 pb -1. 1 June. 6 Sept. Reference data set: Runs 19029 - 21189 (1 June - 19 Sep) 7.6 G triggers.

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Offline Report

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  1. Offline Report P. de Simone 24 September 2001 • Outline: • Status update • DST Proposal

  2. Processing of summer 2001 data LAB integrated luminosity 51 pb-1 7.3 pb-1 1 June 6 Sept • Reference data set: • Runs 19029 - 21189 (1 June - 19 Sep) • 7.6 G triggers • Offline Ldt = 58.3 pb-1 • DBV-9 : 17.0 pb-1 • DBV-10: 41.3 pb-1 • Total events collected: • 326.7 M Bhabhas • 125 M f decays • est. sf = 2.9 mb • 28.4 M KL tags • 21.7 M KL crash • 50.7 M K+K- tags • 15.7 M rp tags

  3. Event streaming 2000 Hz cos 40 Hz raw DC recon. Evt. Class bha 86 Hz prescaled cosmic kpm ÷10 ksl 1640 Hz yes 590 Hz EmC recon. MB cosmic Bhabha DC recon. Evt. Class rpi 70 Hz rad yes clb ÷100 flt 700 Hz afl 9 Hz

  4. Processing statistics for summer 2001 data Raw data: 7565 M Events, 20 TB Physics: 3.0 % of total events 34 % of raw volume Bhabhas: 4.0 % of total events 25 % of raw volume 20 ms 60 ms Stream Events (M) Volume (GB) Summary kpm 51 1475 ksl 150 4200 rpi 15 326 268 M Events rad 45 736 6.7 TB clb 2 40 bha 327 5106 flt 2532 8200 afl 33 103 2746 M Events cos 181 547 8.8 TB Avg. fraction of events tracked 36% NOTE : the new IBM machines halve the reconstruction time NOTE : in 2000 the avg. fraction of tracked events was 26 %

  5. datarec performance in summer 2001 Daily averages — Acquisition rate (evts./day)— Reconstruction rate (rec. evts./day) Follow-up End of data Start of rec. at 6 p.m.  Avg. rec. rate on 64 CPU’s 3KHz Troubles managing more CPU’s Avg. reconstruction rate on 64 IBM CPU’s : 1.5 KHz Staging and procedural losses count Once in stable situation, able to follow the present DAQ rate

  6. datarec executables DBV-9 and DBV-10 DBV - 9: DCONVR Added fine parametrizations of the resolution curves obtained using data VTXFIN Minor bugs fixed DBV - 10: A_C zlib event compression physics streams 160 GB/pb-1  86 GB/pb-1 TRCLMOD The talk-to defaults have been changed. By default, track-to-cluster association for tracks connected to a vertex at the far end is now performed ECLMOD The b cut window defining the KL crash tag has been widened

  7. datarec platform dependence • Test of DBV-10 on SunOS and AIX performed in July: • Input: 1000 raw events (Run 18850) • Output in ksl stream: • AIX: 11 events, including 3 not found on SunOS • SunOS: 10 events, including 2 not found on AIX • Limited information from quick diagnostics  potentially misleading statements • Differences appear at track-fit level • Differences became more pronounced after DBV-8 • Differences made worse by discreteness in fine s-t error parameterizations • Elements of truth in these statements, but full story is more complicated • Turn attention to impact on analysis

  8. Platform dependence: stream contents Run 19990 (4.8 Mtrig) processed on AIX/SunOS • Detail for ksl stream: • Only AIX: 6239 • Only SunOS: 3688 • Different length: 17166 • Otherwise equal: 94969 • After KL tag analysis: • Rxy < 5 cm, |z| < 20 cm • |Mpp – MK| < 20 MeV • One track assoc. to clust. • Difference in counts: 0.04% • (AIX/SunOS: 22731/22722) • Difference in events: 0.24% • (Only AIX/SunOS: 32/23)

  9. Platform dependence: Monte Carlo • MC sample: 1000 ksckl2pc events (KS  p+p-, KL  p+p-) • 43 events with different length • 1 event with different event-type tag • Gold KLTAG, KLCRASH, KSEMIL on both • INTER on AIX only • 1 event with different stream tag • Gold KLTAG, KSEMIL, INTER on Sun • Lost (UFO) on AIX • Platform comparison using MC has subtle points: • In MC, DTCE is generated on one platform, reconstructed on both • When data analyzed in same way, fewer differences observed • Statistics are very poor • Effects appear to be at per-mil level in MC, as in data SunOS disp. vtx. split AIX

  10. Platform dependence: Observations • Large differences apparent at a glance are characteristic of events that are: • Poorly reconstructed • Intrinsically difficult to reconstruct • Background • Much smaller differences in event samples of physics interest • Fractional differences between platforms at per-mil level • We regularly tolerate such differences when starting datarec without waiting for calibrations • Much work in progress • Still trying to understand the problem • Situation less alarming than initially feared

  11. New information in DB2 • Counters:VLAB, Gold Bhabha, gg, KSp+p-, KSp0p0, KL crash • 20 fieldsK+K-, rp, Neutral Radiative, Rejected Bhabha, cosmic, MB • Job table+8 unused fields • Fitted quantities: s from Bhabhas, Etot from gg, T-L/c from Bhabhas, T-L/c from gg, • 20 fieldsM(KSp+p-), sM(KSp+p-), P(KS) • Job table+13 unused fields • Status flags:Biases: Indicates any reconstruction errors that cause biases in stream • 2 flags per streamObsolete: Indicates if file has been superseded by a new reconstruction • datarec file table • Encoding of status flags: • Word of bits independently set to indicate reasons for bias/motive for reprocessing • Calibrations (DC, EmC t, EmC E) • Bugs (FILFO, clustering, tracking, each ECL filter, etc.) • No bits set means stream good to use for analysis • Example KID query: • input url "dbdatarec:stream_code=’rad’ and run_nr between 15197 and 17330 • and Biases=0 and Obsolete=0"

  12. Proposal for mini-DST production • Mini-DST’s to be produced: • in dedicated production pass • in zlib-compressed YBOS format • with a bank subset essential for physics analysis, including summary banks • for different event classification substreams • it looks reasonable to reach 5-6 KB/evt • Status: • zlib compression Done • Scripts Some work needed • Retained banks Proposal exists and • Summary banks needs approval • Substreaming from analysis groups • 15 October is the target date for the readiness of a preliminary version of the • DST production mechanism

  13. DST substreams proposal • Proposal based on ksl Ntuple, radiant substreams, datarec streams, and EVCL tags • ks2pi KS  p+p-, KS  p0p0 • ksemil KS semileptonic decays • klcr KL crash • kl2p0 KL  p0p0 • kl3p0 KL  p0p0p0 • klppp KL  p+p-p0 • intertag interferometry tags • kpm kpm (K+K-) stream • rpi rpi (rp) stream • neu_max4g neutral events, at most 4 prompt g’s • neu_min5g neutral events, at least 5 prompt g’s • cha_min3g 2 tracks, 3 or more prompt g’s • cha_ppg p+p-g tagged events • clb clb (m+m-, p+p-) stream

  14. DST banklist proposal

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