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Axel Naumann, DAxel Naumann, DØØUniversity of Nijmegen, The University of Nijmegen, The
NetherlandsNetherlands
Status Of DØ
Axel Naumann, DAxel Naumann, DØØUniversity of Nijmegen, The University of Nijmegen, The
NetherlandsNetherlands
19 Dec 200219 Dec 2002NIKHEF Annual Scientific MeNIKHEF Annual Scientific Meetingeting
22
Overview
Detector
Data• Luminosity• DAQ
Physics
Axel Naumann, DAxel Naumann, DØØUniversity of Nijmegen, The University of Nijmegen, The
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19 Dec 200219 Dec 2002NIKHEF Annual Scientific MeNIKHEF Annual Scientific Meetingeting
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The DØ Detector
All elements in place!
Commissioned: forward preshower FPS, forward proton detector FPD, level 1 central track trigger CTT
Silicon track trigger STT under construction
Fundamental change in DAQ: Switch to ethernet based DAQ very successful
Data taking efficiency >75%
>50pb-1 available for Moriond
Axel Naumann, DAxel Naumann, DØØUniversity of Nijmegen, The University of Nijmegen, The
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19 Dec 200219 Dec 2002NIKHEF Annual Scientific MeNIKHEF Annual Scientific Meetingeting
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The DØ Detector
New for RunII:• 2T solenoid• silicon tracker
Rebuilt• central tracking• part of calorimeter and muon system• trigger system
Axel Naumann, DAxel Naumann, DØØUniversity of Nijmegen, The University of Nijmegen, The
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Detector: Silicon Tracker
Increase of bias current consistent with expectations, infers depletion voltage exceeds spec @ 4fb-1
p-side pulse-height (ADC)
p-side pulse height1 mip ~ 25 countsSignal/Noise ~ 12Layer efficiency ~ 97%
Integrated Lumi (fb-1)0.02 0.04 0.06
Layer 1,2 Bias Current
Bia
s C
urr
en
t
Axel Naumann, DAxel Naumann, DØØUniversity of Nijmegen, The University of Nijmegen, The
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19 Dec 200219 Dec 2002NIKHEF Annual Scientific MeNIKHEF Annual Scientific Meetingeting
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pT (GeV)
Significant improvement expected from alignment with data in near future
Detector: Tracking Performance
Survey-only alignment constants
width = 36 m(beam) = 30 m
= 20 m
KS +–
first SMTalignment - it helps!
Axel Naumann, DAxel Naumann, DØØUniversity of Nijmegen, The University of Nijmegen, The
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Detector Calorimeter performance
Run II High ET 3-jet
eventET
: 110, 240, 310 GeVEt
miss : 8 GeV
Liquid argon calorimeterwith uranium absorber
Channel Count: 99.9%
J/ e+e-
Axel Naumann, DAxel Naumann, DØØUniversity of Nijmegen, The University of Nijmegen, The
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19 Dec 200219 Dec 2002NIKHEF Annual Scientific MeNIKHEF Annual Scientific Meetingeting
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Detector: Trigger, DAQL1: Cal, Muon available; CTT commissioning underway
L2: operating with CAL, Muon, Global; CTT, PS commissioning underway, STT expected to be operational spring 2003 (huge progress this year from prototype to production)
New ethernet based DAQ: Meets 1kHz L2 accept specs
Spec: 5 kHz
1000 Hz 50 Hz
tape
Peak: 1.2 kHz 50 Hz 1000 Hz
Level 2Level 1 Level 3
Operating: 0.7 kHz 50 Hz 300 Hz
Axel Naumann, DAxel Naumann, DØØUniversity of Nijmegen, The University of Nijmegen, The
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Tevatron
Luminosity major concern: Tevatron and DØ DAQ performance in the beginning far below expectations (“got little beam and didn’t record events”)
Official lumi goal for RunIIa: >5*1031cm-2sec-1, integrated lumi of 2fb-1; actual limit believed to be 2*1032cm-2sec-1
Main luminosity issues for DØ:• Tevatron delivered lumi: p-bar injection; helix
tuning, cooling and losses; many more• DØ DAQ system: readout, triggers, event
building etc (see above)
Axel Naumann, DAxel Naumann, DØØUniversity of Nijmegen, The University of Nijmegen, The
NetherlandsNetherlands
19 Dec 200219 Dec 2002NIKHEF Annual Scientific MeNIKHEF Annual Scientific Meetingeting
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Tevatron
Every performance improvement evident in the luminosity performance plot has been associated with a specific modification to the accelerator complex.
Major modifications since January 1, 2002:Accumulator->Main Injector transfer opticsAdjustment of tunes during low beta squeezeModified injection helix in TevatronProton beam loading compensation in Main InjectorAccumulator (stochastic) cooling upgradeAccumulator shot latticeAntiproton beam loading compensation in Main
InjectorTevatron beam line tuner (BLT)Tevatron tune/coupling drift compensationTevatron transverse dampers
Beams division guy: (1.15)10 =4.0
Axel Naumann, DAxel Naumann, DØØUniversity of Nijmegen, The University of Nijmegen, The
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19 Dec 200219 Dec 2002NIKHEF Annual Scientific MeNIKHEF Annual Scientific Meetingeting
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Tevatron: Plans
January 3.5 week + summer shutdown used for maintenance and improvements
0.0
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Inte
gra
ted
lum
ino
sity
FY
03
FY03 Base plan Achieved FY03 Stretch Plan
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2001 2002 2003 2004 2005 2006 2007 2008 2009 2010
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Run
II In
tegr
ated
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inos
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b-1
)
10/02 Projection Stretch 10/02 Projection Base
End of Run IIbDetector upgrades complete
Limit of Run I Silicon RunIIb prospects: R&D still going on, official “baselining” in a few days (“DØ’s Christmas present”)
Axel Naumann, DAxel Naumann, DØØUniversity of Nijmegen, The University of Nijmegen, The
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DØ: LuminosityLuminosity vs. date
12/0
0
09/0
2
Tevatron delivered luminosity in the beginning below expectations; now catching up rapidly
Reason why lumi is
essential:
Axel Naumann, DAxel Naumann, DØØUniversity of Nijmegen, The University of Nijmegen, The
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19 Dec 200219 Dec 2002NIKHEF Annual Scientific MeNIKHEF Annual Scientific Meetingeting
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DØ: LuminosityEvents vs. date
06/0
1
09/0
2
Data taking efficiency was far below expectations; improved a lot, e.g. a run from last week: 93.5% 40
15 Dec 02
Axel Naumann, DAxel Naumann, DØØUniversity of Nijmegen, The University of Nijmegen, The
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19 Dec 200219 Dec 2002NIKHEF Annual Scientific MeNIKHEF Annual Scientific Meetingeting
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DØ: RunIIb Detector PlansNew silicon detector:• Single sided, barrels only• Installation takes 7
weeks (starting beginning of 2005)
• Inner (vertexing) layers 0, 1 axial, on carbon support
• Outer (tracking) layers 2-5 axial + stereo (tilted sensors)
• Prototype module essentially done
• Lots of experience from RunIIa silicon
Axel Naumann, DAxel Naumann, DØØUniversity of Nijmegen, The University of Nijmegen, The
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Physics: Analysis
Updated reconstruction software: Improved tracking efficiency, object identification, jet energy correction etc
Reconstruction farms in place for high luminosity
NIKHEF 2nd biggest MC provider:
107 events
1/0
2
12/0
2
Axel Naumann, DAxel Naumann, DØØUniversity of Nijmegen, The University of Nijmegen, The
NetherlandsNetherlands
19 Dec 200219 Dec 2002NIKHEF Annual Scientific MeNIKHEF Annual Scientific Meetingeting
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Physics: Analysis
Remote analysis possible, e.g. @ Amsterdam, Nijmegen:
• running local code installations, provided by standard code distribution system
• retrieving data from all other centers (which is, 99%, FNAL) transparently by “SAM”
• huge improvement to last year’s “500 users on one machine” situation
Axel Naumann, DAxel Naumann, DØØUniversity of Nijmegen, The University of Nijmegen, The
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19 Dec 200219 Dec 2002NIKHEF Annual Scientific MeNIKHEF Annual Scientific Meetingeting
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Physics: Analysis Strategy
Topics of interest for NIKHEF: top, Higgs
Until there is enough luminosity: bread and butter physics, developing and using tools
• b jet tagging (leptons, lifetime, vertex), cross section
• Z b b (benchmark for Higgs search), cross section
Already now first top analyses:
• cross section t t all hadronic and t t e + jets
Axel Naumann, DAxel Naumann, DØØUniversity of Nijmegen, The University of Nijmegen, The
NetherlandsNetherlands
19 Dec 200219 Dec 2002NIKHEF Annual Scientific MeNIKHEF Annual Scientific Meetingeting
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Physics: Analysis Topics
NIKHEF PhD students’ work (physics!) at DØ
• Silke Duensing: ID (see the so far unseen at DØ)
• Paul Balm: exclusive b decay• Bram Wijngaarden: b jet search with lifetime
information• Onne Peters: b jet cross section measurement• Axel Naumann: Z b b cross section
measurement• Freya Blekman: tt all hadronic • Lukas Phaf: tt e + + jets• Cristina Galea
Axel Naumann, DAxel Naumann, DØØUniversity of Nijmegen, The University of Nijmegen, The
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19 Dec 200219 Dec 2002NIKHEF Annual Scientific MeNIKHEF Annual Scientific Meetingeting
1919
Physics: Impact Parameter b Tag
Jets with associated muon
Courtesy of Bram WijngaardenGeneric jet sample
Track
Prim Vtx
ImpP
b quark
Axel Naumann, DAxel Naumann, DØØUniversity of Nijmegen, The University of Nijmegen, The
NetherlandsNetherlands
19 Dec 200219 Dec 2002NIKHEF Annual Scientific MeNIKHEF Annual Scientific Meetingeting
2020
Data
MC
Pythia
Physics: b Jet Cross Section
Courtesy of Onne Peters
+ jet cross section
PTRel for different
samples
b jet cross section from + jet sample
b /K c
Run 2 data20<ET
Jet<25GeVFit
MCPythia
Axel Naumann, DAxel Naumann, DØØUniversity of Nijmegen, The University of Nijmegen, The
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19 Dec 200219 Dec 2002NIKHEF Annual Scientific MeNIKHEF Annual Scientific Meetingeting
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Physics: Z 2 Candidate
Courtesy of Silke Duensing
Muon + narrow had jet, both with tracksInv Mass 60GeV
p p Z + 2
Axel Naumann, DAxel Naumann, DØØUniversity of Nijmegen, The University of Nijmegen, The
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2222
Top quark mass (GeV)
W m
ass
(GeV
)
2001
mt 2 GeVmW 15 MeV
Stand
ard
Mod
elSuper
sym
met
ry
Physics: Plans
2fb-1 – Measure top
mass ±3 GeV
– Measure W mass ± 15 MeV
– Directly exclude
mH = 115 GeV– SUSY Higgs
search @ large tan
– Constrain the CKM matrix
Axel Naumann, DAxel Naumann, DØØUniversity of Nijmegen, The University of Nijmegen, The
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6.5 fb-1 – 3 Higgs signal @ mH = 115 GeV; – exclude Higgs 115-125, 155-175 GeV– exclude much of SUSY Higgs parameter
space– possible discovery of SUSY in very large
fraction of minimal SUSY parameter space
11 fb-1
– 3 Higgs signal mH = 115-125, 155-175 GeV;
– exclude Higgs over whole range 115-175 GeV
– possible discovery of SUSY in larger fraction of parameter space
15 fb-1
– 5 Higgs signal @ mH = 115 GeV; – 3 Higgs signal 115-175 GeV
Physics: Plans
Each factor of two in luminosity yields a
significant increase in reach and lays the foundation for
the next steps
Axel Naumann, DAxel Naumann, DØØUniversity of Nijmegen, The University of Nijmegen, The
NetherlandsNetherlands
19 Dec 200219 Dec 2002NIKHEF Annual Scientific MeNIKHEF Annual Scientific Meetingeting
2424
DØ: Rumors…
Breaking news: Higgs has been seen
Strange properties: It’s not colorless!
Cheaper than expected…
Axel Naumann, DAxel Naumann, DØØUniversity of Nijmegen, The University of Nijmegen, The
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19 Dec 200219 Dec 2002NIKHEF Annual Scientific MeNIKHEF Annual Scientific Meetingeting
2525
DØ: Summary And Future• Detector completed, running smoothly• Luminosity excellent progress in the past
year that serves as a solid platform for future progress
• First “real” physics results are coming in
• Main area of work now reconstruction, analysis
Axel Naumann, DAxel Naumann, DØØUniversity of Nijmegen, The University of Nijmegen, The
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19 Dec 200219 Dec 2002NIKHEF Annual Scientific MeNIKHEF Annual Scientific Meetingeting
2626
Detector: Forward ProtonElastic scattering data
Scintillating fiber detector inside
t
-59m +33m0m
0
Axel Naumann, DAxel Naumann, DØØUniversity of Nijmegen, The University of Nijmegen, The
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19 Dec 200219 Dec 2002NIKHEF Annual Scientific MeNIKHEF Annual Scientific Meetingeting
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Detector: Forward Preshower
Extensive forward coverage: 1.5 || 2.5
u,v stereo layers with 15k channels
Offline reconstruction using matched u, v clusters and E correlation
Axel Naumann, DAxel Naumann, DØØUniversity of Nijmegen, The University of Nijmegen, The
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Detector: Scintillating Fiber Tracker
Fully instrumented, performing well (layer eff >98%)Also used for track triggering on Level 1 (CTT)