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:

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

KLOE MC upgrades for 2004-2005

• Map of 2004/2005 machine and trigger conditions

• New (post-2003) IR geometry

• Better parameterizations of EmC responseTime, energy resolution; cluster efficiencies

• Improved treatment of nuclear interactions/regeneration in DC wall and beam pipe

• New secondary decay generatorsKSee,ee,ee0

• Inserted background from events acquired with random trigger

• Simulation of noise correlated to K tracks

• Simulation of dE/dx measurement in DC

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)

Background from random triggers

– data• MC

Cluster time distributions (t0 from KS secondaries)

KS , KL crash Overall accidental levelMC/data = 1.05

KS , KL crash Overall accidental levelMC/data = 1.19

Track reconstruction efficiency higher in MC when t0 incorrect

tcl (ns)

tcl (ns)

~3% of clusters in tail (t < 0)

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

Simulation of noise hits for K tracks

+ (MC)+ (data)

trk+vtx as a function of t*(K)

t*(K) (ns) t*(K) (ns)

before after

• E 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 (count/cm)

K2 sample

K2 sample

dE/dx (count/cm)

dE/dx distribution Truncated mean distribution

K2 sample

K2 sample

+ data– MC

dE/dx resolution adequate for K ID, but not e.g. Ke2/K2 separation

Simulation of DC dE/dx measurement

Monte Carlo production plans

2001-2002

450 pb-1

2004-2005

2000 pb-1

1.85G evts

8800 B80 days

8.25G evts

39000 B80 days

Averaged over entire MC sample: 0.21M evts/B80 day = 2.4 Hz0.41 s/evt (simulation + reconstruction + DST)

all, scale = 0.2KSKL, scale = 1

KK, scale = 1 radiative, scale = 5Other (1M evts/pb-1)

Total: 3.1M evts/pb-1

(about same as number of decays in data)

2001-2002 MC production Estimated time for 2004-2005 MC

Monte Carlo production status

350 pb-1 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

• all, KSKL, KK campaigns to be combined:

all_phys, L scale 1.2

• Start with 2005 data: Reprocessing not necessary for comparison

Offline resources: CPU

Nodes Type CPUsB80

“MC”

B80

“CW”

fibm14-15,17-34 P3 375 MHz 80 80 80

fibm35-44 P4+ 1.45 GHz 40 88 96

fibm45-47 (Jan ’06) P5 1.5 GHz SMT “96” 126 184

All 294 360

• KLOE CPU accounting is performed in B80 units1 “B80 CPU” = 1 P3 CPU installed in B80 serverUncertainties transferred to B80/P4+ and B80/P5 ratios

• “MC” estimates based on MC tests conducted May 2006

• “CW” estimates based on past experience

Offline CPU needs

2006 offline projects B80 days Days/214 B80

Reprocessing of 2004 data 16000 75

MC production for 2004-2005 data 39000 180

All other reprocessing (900 pb-1) 22000 100

Minimum total 55000 260

Maximum total 77000 360

9-12 months if there are no serious DH problems

Assuming: 294 B80 total (MC test, not CW)80 B80 left to users for analysis

214 B80for offline

Offline resources: Disk space

DSTs cached on nfs-mounted disks for fast analysis access

Current Final

35 TB data

10 TB MC

45 TB total

42 TB data

44 TB MC

86 TB total

DST volume*

Current DST cache capacity: 12 TB

New purchases: 21 TB FC disk + new controllerGara closed at beginning of MayOrder to be approved by Giunta next week, delivery by end of June?

~30 TB available for disk cache

*Updated to account for scan data

Offline resources: Tape library

0 200 400 600 800 1000

Final

Current

Tape library usage (TB)

raw DST

rec MC

536

955

Current capacity810 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)

Will need 145 TB of additional cassettes to finish MC production400 new cassettes (120 TB) already financed

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

L dt (pb–1)

tag 100

2001 169

2002 292

2004 691

2005 1242

total 2394

Reconstruction of 2004-2005 data

0 500 1000 1500 2000

drn/drc

d3p

dk0

dkc

recon

tag 100

raw

1930

1740

1970

990

1480

1520

1480

pb–1

Runs 28700 (9 May 04) to 41902 (5 Dec 05)Updated to reflect DB work 21 Mar 06

Reconstructed KLOE data

DBV 2001 2002 2004 2005 Scan Comment

12-15 163 34Bad cut in FILFONo bias sample for FILFONo bias sample for rad

19-21 645bad

wires!

217Various significant ECL modsMinor changes to reconNo bias sample for rad

22 222 395Stable ECLOld bias sample for rad

23-24 12 502 61Stable ECL for s = m

ufo as bias sample

25 16 205Stable ECL for off-peakufo as bias sample

analyzed 163 269 645 1114 266

total 169 292 691 1242 284

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