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Tevatron Operations |
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Hardware |
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Layer00 |
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SVX |
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Software |
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Silicon Monitoring and Alignment |
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Level 3 Trigger |
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CDF Database |
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Computing |
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Physics Analyses |
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B physics |
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Electroweak |
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Searches |
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Comments & Conclusions |
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Commissioning Run |
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7 fills: Oct 8th – Nov 4th |
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Max lumi: 4x1029cm-2/s
with 36x36 bunches |
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57.6nb-1 integ. lumi. |
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All detectors installed bar Silicon. 6% proto-type instead. |
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Level 1,2 & 3 triggers |
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Full DAQ |
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Run II |
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April 3rd 2001 0 LHC
startup |
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Max lumi: 7.9x1030cm-2/s |
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7.2pb-1 integ. lumi. |
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Expect 2000pb-1 |
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CDF essentially complete |
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Level 1 (2) 3 triggers |
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Physics quality data |
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Layer00 is the silicon detector closest to the
beampipe. R=1.6cm |
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UK designed & purchased the silicon. |
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Designed and constructed the two 50cm long
carbon fibre support structure and cooling. |
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Irradiated and tested kapton cables |
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Performed cooling studies |
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Size of |
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Beampipe |
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Comprehensive monitoring tool |
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Online: for rapid reaction to problems |
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Offline: for detailed studies and record of
performance over time |
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Implementation: |
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Define quantities |
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Create histograms |
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Intuitive GUI |
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UK responsible for delivering the CDF database,
online and offline. |
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Acquire, store, provide information about the
data and running conditions. |
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Online: real time storage from hardware, run
control, trigger, monitoring, calibration |
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Offline: deliver to reconstruction and physics
analysis. |
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Coordinate consultants, schema designers,
computer system experts, users. |
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Start: structure insufficient for expected size
and usage |
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Poll hardware and software experts |
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Implement new management structure |
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End: 30GB database created which handles 50,000
accesses/day. 99.8% up-time. |
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Prototype database export system setup and in
test between FNAL and UK. |
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Coherent UK strategy on computing |
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>1Petabyte of data |
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£1.8m grant from JIF |
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4/5 for high-speed, high-volume disk |
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1/5 for networking |
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Committed half so far |
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Universities & RAL: 8-way SMP server with
fibre channel to 1TB RAID |
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Universities at FNAL: 8 dual-processor PCs |
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FNAL: 10TB RAID |
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Improve performance of Tevatron |
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Several 10% improvements possible |
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Request for effort |
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Optimise lithium lens design (p collection) |
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Model production and propagation |
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Create visualisation tool for machine physicists |
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Three UK technicians helping (travel paid by
FNAL) |
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One UK student (funded by FNAL) |
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B physics: Lifetimes and Oscillations |
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Electroweak Physics |
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Searches: SUSY and Higgs |
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First measurements which CDF will perform in b
sector |
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Necessary step towards oscillation |
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(Test of alignment, tracking, tagging.) |
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Best measurement of Bs0, Lb. (Unique) |
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Lifetime measurements: prelude to oscillations |
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For B mesons, Flavour eigenstates @weak
eigenstates |
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So B0 3B0 |
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Mixing parameter: x = Dm/G |
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LEP/Barbar: xd = 0.73 To date: xs > 14.6 Tevatron unique |
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Usually measure by oscillating exponential; UK
has developed new complementary method |
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Dm ] DG = f (tH,
tL ) |
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Separate eigenstates and measure each lifetime |
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BS ® DS+ DS-
(CP even) Work continuing in triggering on
these difficult hadronic modes (track/vertex/reconstuct) |
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BS ® J/y f
(CP even&odd) Different angular distribution for mm allow
separation of CP even and odd states |
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BS ® J/y h
(CP odd) |
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Introduce new W and Z simulations to CDF |
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Calculate systematic uncertainty on W mass from
higher orders. |
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Conclude (2fb-1) |
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W mass to 30MeV |
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W width to 40MeV |
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Studying muon and electron identification |
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Studying lepton spectra for sensitivity to
different SUSY models (eg. gluino pairs) |
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Builds on electron/muon identification |
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Specific search for chargino decays |
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c+ ® c02
ln |
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c02 ®
c01 l l |
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3 leptons often enriched in taus |
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Standard searches may exclude but not discover
Higgs to 180GeV |
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Largest production mode is gg ® H ®bb |
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…. but QCD background enormous |
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We can reconstruct bb with 10-15 GeV. |
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…. Suppose we could reconstruct with 200 MeV |
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Glasgow (2.6 FTE) |
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S. d’Auria |
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P. Bussey |
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R. St.Denis |
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S. Thomson |
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5 students |
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Liverpool (5.9 FTE) |
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P. Booth |
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B. Heinemann |
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M. Houlden |
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B. King |
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S. Marti |
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R. McNulty |
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T. Shears |
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A. Taffard |
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2 students |
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Oxford (4.7 FTE) |
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F. Azfar |
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T. Huffman |
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J. Loken |
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L. Lyons |
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J. Rademacker |
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A. Reichold |
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P. Renton |
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D. Waters |
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4 students |
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UCL (2.1 FTE) |
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M. Lancaster |
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R. Snihur |
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D. Waters |
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3 students |
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Relativity small number of physicists: 15.3 FTE + 14 students |
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High profile on experiment of 500 people |
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Very attractive to students and postdocs |
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Value for money |
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UK have delivered major components of CDF:
Layer00, Level 3 Trigger, Database. |
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UK coordinate/are responsible for: Database,
Level 3, Silicon Monitoring, Alignment |
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Understanding Detector: Silicon, Tracking,
Muons, Electrons |
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Physics Analysis underway: B physics,
Electroweak, Searches |
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Coherent UK hardware/software effort with common
data model (JIF) & common physics goals. |
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Notes