15/11/2004 NIKHEF SAC, Sijbrand de Jong 1 DØ Report DØ Report NIKHEF SAC meeting NIKHEF SAC meeting 15/11/2004 15/11/2004 (report for internal use only) (report for internal use only) Sijbrand de Jong Sijbrand de Jong • Tevatron performance Tevatron performance • DØ hardware status DØ hardware status • Physics with DØ Physics with DØ • Transition to ATLAS Transition to ATLAS
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15/11/2004NIKHEF SAC, Sijbrand de Jong 1 DØ Report NIKHEF SAC meeting 15/11/2004 (report for internal use only) Sijbrand de Jong Tevatron performanceTevatron.
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commissioning next year)commissioning next year)2.2. Slip stacking at 10Slip stacking at 101212 p/pulse every 2 seconds p/pulse every 2 seconds3.3. Increase pbar production aperture by 25%Increase pbar production aperture by 25%4.4. Increase stacking rate at small stacksIncrease stacking rate at small stacks5.5. Mixed pbar operation, the recycler starts to pay-offMixed pbar operation, the recycler starts to pay-off
+ many small improvements+ many small improvements
Tracking StatusTracking StatusOverall very stable over past year.Overall very stable over past year.Concerns:Concerns:1.1. 17% of SMT dead (~ random regions)17% of SMT dead (~ random regions)2.2. 1% channel loss in CFT (in VLPC cassettes)1% channel loss in CFT (in VLPC cassettes)3.3. Tracking software performance (pattern reco & speed)Tracking software performance (pattern reco & speed)Radiation damage expected for >5 fbRadiation damage expected for >5 fb-1-1
New L0 will coverNew L0 will cover(and even improve)(and even improve)
NIKHEF contribution toNIKHEF contribution toSMT construction andSMT construction andradiation monitoringradiation monitoring
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Calorimetry and Muon System StatusCalorimetry and Muon System StatusIntermittent noise problems in calorimeter:Intermittent noise problems in calorimeter:•Hot patches, Rings of fireHot patches, Rings of fire•Noise hunt pays off:Noise hunt pays off:
Found whole bunch of dead-shorts Found whole bunch of dead-shorts (metal washers instead of G10)(metal washers instead of G10) First indications of reduced noise sensitivityFirst indications of reduced noise sensitivity
•Muon system performance efficientMuon system performance efficient and very stableand very stable
NIKHEF contribution to muon reconstructionNIKHEF contribution to muon reconstruction
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Forward Proton DetectorForward Proton DetectorCommissioned and operated stand-aloneCommissioned and operated stand-aloneSoon to be operated routinely in DØ DAQSoon to be operated routinely in DØ DAQ
==p/pp/pdistributiondistribution
NIKHEF contributed Roman PotNIKHEF contributed Roman Potthin windows and castlesthin windows and castles
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Trigger and DAQTrigger and DAQ
DAQ can handle bigger rates than foreseenDAQ can handle bigger rates than foreseen(after extensive work)(after extensive work)
Read-out dead time of SMT limiting 1Read-out dead time of SMT limiting 1stst level trigger level trigger
Trigger needs additional functionality to cope with Trigger needs additional functionality to cope with higherhigherLuminosity and to allow lower thresholds, e.g. on jetsLuminosity and to allow lower thresholds, e.g. on jets
Trigger upgrade is proceeding to planTrigger upgrade is proceeding to plan22ndnd level Silicon Track Trigger has been commissioned level Silicon Track Trigger has been commissioned
NIKHEF contribution to STTNIKHEF contribution to STT
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Reconstruction & MCReconstruction & MC
Reconstruction improves continuouslyReconstruction improves continuouslyAll data has been reprocessed (with p14) to physics All data has been reprocessed (with p14) to physics qualityquality
(20% off-site)(20% off-site)All data will be reprocessed again (with p17) to All data will be reprocessed again (with p17) to improveimprove
>10>1099 events to be processed events to be processedProcessing speed crucialProcessing speed crucial (need to improve (need to improve significantly)significantly)GRID usage essentialGRID usage essentialMC producing about 10MC producing about 1066 events per week (world-wide) events per week (world-wide)
(e.g. at (e.g. at NIKHEF fully gridifiedNIKHEF fully gridified))
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DØ Data taking efficiencyDØ Data taking efficiency
Final state flavour: sign Final state flavour: sign in B in BD*D*XX
3 methods of initial state flavour tagging:3 methods of initial state flavour tagging:Opposite side soft muon:Opposite side soft muon:mmdd=0.506=0.5060.0550.0550.049 ps0.049 ps-1-1
Same side fragmentation pion:Same side fragmentation pion:mmdd=0.488=0.4880.0660.0660.044 ps0.044 ps-1-1
Comby of above two + same side jet charge:Comby of above two + same side jet charge:mmdd=0.456=0.4560.0340.0340.025 ps0.025 ps-1-1
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tt tt l+ l++4 jets+4 jets
Single tag Double tagSingle tag Double tag
CSIPCSIP
SVTSVT
e channel ine channel inthesis ofthesis ofLukas PhafLukas Phaf(cum laude)(cum laude)
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tt tt e e+2+2+bb+bb
S:N=70:1S:N=70:1
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tt tt e e+2+2+2 jets event+2 jets event
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tt tt e e+2+2+2 jets event+2 jets event
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tt tt 6 jets 6 jets
cutcut
cutcut
>= 1 SVT tag>= 1 SVT tag
Thesis of Freya BlekmanThesis of Freya Blekman(expected soon)(expected soon)
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Top cross section and massTop cross section and mass
Biggest problem: jet energy scaleBiggest problem: jet energy scale
(Large) Extra Dimensions(Large) Extra DimensionsLooking for Looking for (M (Mss>1.36 TeV) and>1.36 TeV) andee/ee/ (Ms>1.1 TeV) resonances (Ms>1.1 TeV) resonances(next slide)(next slide)
Jets+EJets+ETTmismis: M: Mss>0.7 TeV>0.7 TeV
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0
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NIKHEF participation in DØNIKHEF participation in DØ
staffstaff
PhD studentsPhD students Post-docsPost-docs
Jul 9
8Ju
l 99
Jul 0
0
Jul 0
4Ju
l 05
Jul 0
6Ju
l 07
Jul 0
8Ju
l 09
Jul 0
3
Jul 0
2
Jul 0
1
NOWNOW
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Towards ATLASTowards ATLAS
GRID tests under realistic conditionsGRID tests under realistic conditionsNIKHEF plays very active role inNIKHEF plays very active role inDØ GRID deploymentDØ GRID deployment
Hadron collider physics analysis backgroundHadron collider physics analysis backgroundExperienced staff on ATLASExperienced staff on ATLAS
Creating interest in hadron collider physicsCreating interest in hadron collider physicsPositive atmosphere for ATLASPositive atmosphere for ATLAS
•DØ is getting into shapeDØ is getting into shape•Calibration at physics paper level and improvingCalibration at physics paper level and improving•Ten’s of papers submitted this yearTen’s of papers submitted this year
•NIKHEF has significant contributionNIKHEF has significant contribution•High profile analyses:High profile analyses: bottombottom
toptoptautau
•Transfer of knowledge (GRID,…)Transfer of knowledge (GRID,…)and experience (people,…)and experience (people,…)