lhcb computing in russia ivan korolko (itep moscow) russia-cern jwgc, october 2005
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LHCb computing in Russia
Ivan Korolko (ITEP Moscow)
Russia-CERN JWGC, October 2005
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LHCb in numbersLHCb nominal Luminosity → 2x1032 cm-2 s-1
rate of p-p interactions → 2x107 per second
HLT output → 2000 Hz
RAW data per year → 2x1010 events (500 TB)
Events with b quarks → 105 per second (!)
acceptance for b-events → 5-10%
Br. for CP channels → ~10-5
Number of CP channels → ~50
~5 signal events in every second of LHCb operation – GREAT!
Have to select them from 1.5x107 background events
Signature of LHCb signals is not very bright (Pt , vertex)
Estimation of S/B ratio is a REAL CHALLENGE
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LHCb computing documents
LHCb computing model LHCb 2004-119
LHCb computing TDR CERN/LHCC 2005-019
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LHCb computing model (1)
1. RAW data → 2x1010 events/year
25 kB/event , 500 TB/year
1 copy stored at CERN and
1 copy in Tier1 centers
2. Reconstruction → 2.4 kSI2k.sec/event
2 times per year → 7 months and 2 months
CPU needs : 12MSI2k.years
storage: 500 TB (rDST data for stripping)
1 copy stored across CERN and Tier1 centers
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4. Analysis → 0.3 kSI2k.s/event
140 physicists , 2 jobs/week , 3x106 events
CPU needs : 0.8 + 0.8x(n-1) MSI2k
storage: 200 TB
run at CERN, Tier1 and some Tier2 centres
LHCb computing model (2)
3. Stripping → 2.1x109 events/year
50-100 kB/event , 139 TB/year (DST)
4 times per year (1 month)
stored at CERN, Tier1 and some Tier2 centres
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LHCb computing model (3)
5. MC production → 4x109 events/year
~50 kSI2k.sec/event (8 MSI2k.years)
400 kB/event
160 TB to store only triggered events (4x108)
produced at Tier2 centres
stored at CERN and Tier1 centres
LHCb trigger differs significantly from ATLAS and CMS
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Russian participation in LHCb
IHEP (Protvino), INP (Novosibirsk), INR (Troitsk),
ITEP (Moscow), PNPI (St.Petersburg)
SPD and Preshower, ECAL, HCAL,
MUON system and RICH mirrors
Design, construction and maintenance of detectors
Development of reconstruction algorithms
Historical interests in B physics
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Russian participation in LHCb
Physics interests of Russian scientists:
• Studies of CP violation with B and D hadrons
• Rare (forbidden) decays of B and D hadrons
• Radiative penguin decays pf B mesons (non SM physics)
• Spectroscopy of B hadrons
• High Pt jets (W and Z bosons, t quarks, Higgs, exotica)
Canonical users in Russian institutes:
IHEP -7, INP-5, INR-5, ITEP-7, PNPI-6
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What to “compute” in Russia ?
There are 2 main tasks:
1. Provide facilities for LHCb data analysis in all participating Russian institutes.
2. Fulfill collaboration requirements
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Computing in Russia (1)
1. Partially store reconstructed data (rDST)
most recent copy for the current year
1 copy for all previous years
storage: 225 + 225x(n-1) TB (b inclusive)
2. Store stripped data (DST)
most recent copy for the current year
1 copy for all previous years
storage: 140 + 140x(n-1) TB
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Computing in Russia (2)
3. Run stripping jobs on stored rDST
B-inclusive sample – 9x109 events/year
CPU needs : 0.06 MSI2k.years
CPU power : 0.72 MSI2k.years (finish in one month)
data reduction factor ~100
TAG: 9 + 9x(n-1) TB
4 stripping passes per year → 0.3 MSI2k.years
rerun stripping during first years of LHCb operation
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4. Run analysis jobs (20% of LHCb)
Computing in Russia (3)
CPU → 0.2 + 0.2x(n-1) MSI2k.years
storage: 50 + 50x(n-1) TB
MC analysis also requires some resources
B-exclusive dimuon D* B-inclusive
physicists 15 4 4 7
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Computing in Russia (4)
5. MC production (~10% of LHCb)
CPU → 0.8 MSI2k.years
storage: 3 TB
6. Calibration, reconstruction algorithms
CPU → 0.2 MSI2k.years
storage: 30 TB
(hard to estimate now)
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LHCb Tier2 cluster in Russia
CPU MSI2k disks TB tapes TB
2006 0.4 100
2007 1.0 300 100
2008 1.5 440 400
2009 2.0 820 500
2010 2.5 1200 600
partial Tier1 functionality (DST stripping, analysis)
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History of LHCb DCs in Russia
2002 130K events, 1% contribution
only one centre (ITEP)
2003 1.3M events, 3% contribution
all 4 our centers (IHEP,ITEP,JINR,MSU)
2004 9.0M events, 5% contribution
started to use LCG
2005 PNPI and INR have joined
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PlansMC production for the collaboration
routine task (running in 5 Russian centers)
participation in DC06
Distributed analysis
extensive tests of GANGA (CERN, Tier1)
deployment of GANGA in Russia
participation in SC
Significant increase of resources in 2006
learn how to operate much larger centers