UK-CDF

1
UK-CDF
Ronan McNulty (Liverpool) on behalf of Glasgow,
Liverpool, London, Oxford
2
Overview

• Tevatron Operations
• Hardware
• Layer00
• SVX
• Software
• Silicon Monitoring and Alignment
• Level 3 Trigger
• CDF Database
• Computing

• Physics Analyses
• B physics
• Electroweak
• Searches
• Comments Conclusions

3
Tevatron Operations

• Commissioning Run
• 7 fills Oct 8th Nov 4th
• Max lumi 4x1029cm-2/s with 36x36 bunches
• 57.6nb-1 integ. lumi.
• All detectors installed bar Silicon. 6
  proto-type instead.
• Level 1,2 3 triggers
• Full DAQ

• Run II
• April 3rd 2001 ? LHC startup
• Max lumi 7.9x1030cm-2/s
• 7.2pb-1 integ. lumi.
• Expect 2000pb-1
• CDF essentially complete
• Level 1 (2) 3 triggers
• Physics quality data

4
Layer 00
Wide plaquettes Sit here

• Layer00 is the silicon detector closest to the
  beampipe. R1.6cm
• UK designed purchased the silicon.
• Designed and constructed the two 50cm long carbon
  fibre support structure and cooling.
• Irradiated and tested kapton cables
• Performed cooling studies

Narrow plaquettes

• Size of
• Beampipe

Cooling channel
Carbon fibre prototype
5
Layer 00 construction
Assembly jig
Wide silicon mounted here
Narrow silicon mounted

• Hybrid

6
Layer00 Performance
1/6 of Layer00 taking data (due to power supply
delays)
Tracks observed in silicon
Charge deposition in silicon
7
SVX
Two wedges of SVX Implemented for Commissioning
Run
One of Three Silicon Barrels installed for Run II.
8
SVX Testing
9
Performance of SVX
Correlation of charge deposited on n and p sides,
for data taken with a ruthenium source
10
UK first to see beam profile
Combined efforts of silicon expertise, database
(pedestal update), and tracking algorithms led to
first observation of the beam during
Commissioning Run
Silicon Layers
Beampipe
Overlay of many events with pTgt100MeV
cm
Residuals from Si hits to circle fit
11
Silicon Monitoring

• Comprehensive monitoring tool
• Online for rapid reaction to problems
• Offline for detailed studies and record of
  performance over time

• Implementation
• Define quantities
• Create histograms
• Intuitive GUI

12
Barrel 0
Barrel 1
Barrel 2
Rf hits
Rf hits on tracks
R v z for hits on tracks
13
Silicon Alignment
Alignment vital for b tagging, B lifetimes,
oscillations, CP violation, and searches
Perfect Alignment s 14mm
Impact Parameter (cm)
After s15mm
Before s40mm
Impact Parameter (cm)
Impact Parameter (cm)
14
Level 3 Trigger
15
Level 3 Trigger

• Software Trigger (In 500Hz out 75Hz)
• Fast event reconstruction on ?250 CPUs.

• Operating since commissioning run
• UK coordination and 24 hour support
• Automated system for code validation
• Regional tracking algorithms for full offline
  reconstruction in selected detector regions

16
The CDF Database

• UK responsible for delivering the CDF database,
  online and offline.
• Acquire, store, provide information about the
  data and running conditions.
• Online real time storage from hardware, run
  control, trigger, monitoring, calibration
• Offline deliver to reconstruction and physics
  analysis.
• Coordinate consultants, schema designers,
  computer system experts, users.

17
The CDF Database

• Start structure insufficient for expected size
  and usage
• Poll hardware and software experts
• Implement new management structure
• End 30GB database created which handles 50,000
  accesses/day. 99.8 up-time.
• Prototype database export system setup and in
  test between FNAL and UK.

5 dbAdministrators
7 C/Oracle physicist
40 Application programmers
500 Users
Tools
18
Computing

• Coherent UK strategy on computing
• gt1Petabyte of data
• 1.8m grant from JIF
• 4/5 for high-speed, high-volume disk
• 1/5 for networking

• Committed half so far
• Universities RAL 8-way SMP server with fibre
  channel to 1TB RAID
• Universities at FNAL 8 dual-processor PCs
• FNAL 10TB RAID

Direct Contribution from UK to CDF
19
(No Transcript)
20
Accelerator Work

• Improve performance of Tevatron
• Several 10 improvements possible
• Request for effort
• Optimise lithium lens design (p collection)
• Model production and propagation
• Create visualisation tool for machine physicists

• Three UK technicians helping (travel paid by
  FNAL)
• One UK student (funded by FNAL)

21
Physics Analyses

• B physics Lifetimes and Oscillations
• Electroweak Physics
• Searches SUSY and Higgs

22
B lifetimes

• First measurements which CDF will perform in b
  sector
• Necessary step towards oscillation
• (Test of alignment, tracking, tagging.)
• Best measurement of Bs0, Lb. (Unique)

HQET t(B )/ t (B0 )1.05 t( Bs0)/ t (B0
)1.00 t( Lb)/ t (B0 )0.9 to 1.0
Experiment t( Lb)/ t (B0 ) is 0.78-.04
23
B lifetimes
24
B lifetime
Millions of B mesons have already been produced
in RunII. Need to trigger and identify relevant
decays. Leptons easy hadrons difficult
Run I data UK thesis topic
Run II data tracks with Silicon hits
Look for J/y ? mm
Search for B?J/y K
25
Bs oscillations

• Lifetime measurements prelude to oscillations
• For B mesons, Flavour eigenstates ?weak
  eigenstates
• So B0 ?B0
• Mixing parameter x Dm/G
• LEP/Barbar xd 0.73 To date xs gt 14.6
  Tevatron unique
• Usually measure by oscillating exponential UK
  has developed new complementary method

PB(t) ? e-Gt(1cos(Dm t))
26
B oscillations

• Dm ? DG f (tH, tL )
• Separate eigenstates and measure each lifetime
• BS ? DS DS- (CP even) Work continuing in
  triggering on these difficult hadronic modes
  (track/vertex/reconstuct)
• BS ? J/y f (CP evenodd) Different angular
  distribution for mm allow separation of CP even
  and odd states
• BS ? J/y h (CP odd)

27
B oscillations
Search for BS ? J/y h. UK Thesis with Run 1
data
Br.(BS ? J/y h)lt8.75 x 10-4 at 90 c.l. (Prelim)
28
Electroweak Physics

• Introduce new W and Z simulations to CDF
• Calculate systematic uncertainty on W mass from
  higher orders.

• Conclude (2fb-1)
• W mass to 30MeV
• W width to 40MeV
• Studying muon and electron identification

29
Electroweak Physics
30
Electroweak Physics
Z ? mm candidate
31
SUSY

• Studying lepton spectra for sensitivity to
  different SUSY models (eg. gluino pairs)
• Builds on electron/muon identification

• Specific search for chargino decays
• c ? c02 ln
• c02 ? c01 l l
• 3 leptons often enriched in taus

32
Higgs
Higgs search will be highlight of Run II for
CDF/D0.

• Standard searches may exclude but not discover
  Higgs to 180GeV

33
Higgs

• Largest production mode is gg ? H ?bb
• . but QCD background enormous
• We can reconstruct bb with 10-15 GeV.
• . Suppose we could reconstruct with 200 MeV

34
Higgs
Look in diffractive mode pp ? pHp Reconstuct from
missing mass of pp system
Large theoretical uncertainties exist as
discussed at IPPP Durham last week. Theoretical
Experimental clarification required before
proceeding to CDF approval or build.
35
Higgs
36
UK CDF Personnel

• Glasgow (2.6 FTE)
• S. dAuria
• P. Bussey
• R. St.Denis
• S. Thomson
• 5 students
• Liverpool (5.9 FTE)
• P. Booth
• B. Heinemann
• M. Houlden
• B. King
• S. Marti
• R. McNulty
• T. Shears
• A. Taffard
• 2 students

• Oxford (4.7 FTE)
• F. Azfar
• T. Huffman
• J. Loken
• L. Lyons
• J. Rademacker
• A. Reichold
• P. Renton
• D. Waters
• 4 students
• UCL (2.1 FTE)
• M. Lancaster
• R. Snihur
• D. Waters
• 3 students

37
Conclusions (I)

• Relativity small number of physicists
  15.3 FTE 14 students
• High profile on experiment of 500 people
• Very attractive to students and postdocs
• Value for money

• Limited funding is having an impact on
  recruitment, profile and physics
• Further to continual maintenance, we need to
  exploit out investment by producing physics.

38
Conclusions (II)

• UK have delivered major components of CDF
  Layer00, Level 3 Trigger, Database.
• UK coordinate/are responsible for Database,
  Level 3, Silicon Monitoring, Alignment
• Understanding Detector Silicon, Tracking, Muons,
  Electrons
• Physics Analysis underway B physics,
  Electroweak, Searches
• Coherent UK hardware/software effort with common
  data model (JIF) common physics goals.