UK-CDF Ronan McNulty (Liverpool) on behalf of Glasgow, Liverpool, London, Oxford.
-
Upload
michelle-mcginnis -
Category
Documents
-
view
221 -
download
0
Transcript of UK-CDF Ronan McNulty (Liverpool) on behalf of Glasgow, Liverpool, London, Oxford.
![Page 1: UK-CDF Ronan McNulty (Liverpool) on behalf of Glasgow, Liverpool, London, Oxford.](https://reader035.fdocuments.in/reader035/viewer/2022062307/5516021a550346cf6f8b5bd7/html5/thumbnails/1.jpg)
UK-CDF
Ronan McNulty (Liverpool)
on behalf of Glasgow, Liverpool, London, Oxford
![Page 2: UK-CDF Ronan McNulty (Liverpool) on behalf of Glasgow, Liverpool, London, Oxford.](https://reader035.fdocuments.in/reader035/viewer/2022062307/5516021a550346cf6f8b5bd7/html5/thumbnails/2.jpg)
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
![Page 3: UK-CDF Ronan McNulty (Liverpool) on behalf of Glasgow, Liverpool, London, Oxford.](https://reader035.fdocuments.in/reader035/viewer/2022062307/5516021a550346cf6f8b5bd7/html5/thumbnails/3.jpg)
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
![Page 4: UK-CDF Ronan McNulty (Liverpool) on behalf of Glasgow, Liverpool, London, Oxford.](https://reader035.fdocuments.in/reader035/viewer/2022062307/5516021a550346cf6f8b5bd7/html5/thumbnails/4.jpg)
Layer 00• Layer00 is the silicon
detector closest to the beampipe. R=1.6cm
• 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
Carbon fibre prototype
Coolingchannel
Size ofBeampipe
Wide plaquettesSit here
Narrow plaquettes
![Page 5: UK-CDF Ronan McNulty (Liverpool) on behalf of Glasgow, Liverpool, London, Oxford.](https://reader035.fdocuments.in/reader035/viewer/2022062307/5516021a550346cf6f8b5bd7/html5/thumbnails/5.jpg)
Layer 00 construction
Narrow siliconmounted
Wide silicon mounted here
Hybrid
Assembly jig
![Page 6: UK-CDF Ronan McNulty (Liverpool) on behalf of Glasgow, Liverpool, London, Oxford.](https://reader035.fdocuments.in/reader035/viewer/2022062307/5516021a550346cf6f8b5bd7/html5/thumbnails/6.jpg)
Layer00 Performance
1/6 of Layer00 taking data (due to power supply delays)
Tracks observed in silicon Charge deposition in silicon
![Page 7: UK-CDF Ronan McNulty (Liverpool) on behalf of Glasgow, Liverpool, London, Oxford.](https://reader035.fdocuments.in/reader035/viewer/2022062307/5516021a550346cf6f8b5bd7/html5/thumbnails/7.jpg)
SVX
Two wedges of SVXImplemented for Commissioning Run
One of Three Silicon Barrelsinstalled for Run II.
![Page 8: UK-CDF Ronan McNulty (Liverpool) on behalf of Glasgow, Liverpool, London, Oxford.](https://reader035.fdocuments.in/reader035/viewer/2022062307/5516021a550346cf6f8b5bd7/html5/thumbnails/8.jpg)
SVX Testing
![Page 9: UK-CDF Ronan McNulty (Liverpool) on behalf of Glasgow, Liverpool, London, Oxford.](https://reader035.fdocuments.in/reader035/viewer/2022062307/5516021a550346cf6f8b5bd7/html5/thumbnails/9.jpg)
Performance of SVX
Correlation of charge deposited on n and p sides, for data taken with a ruthenium source
![Page 10: UK-CDF Ronan McNulty (Liverpool) on behalf of Glasgow, Liverpool, London, Oxford.](https://reader035.fdocuments.in/reader035/viewer/2022062307/5516021a550346cf6f8b5bd7/html5/thumbnails/10.jpg)
UK first to see beam profileCombined efforts of silicon expertise, database (pedestal update), and tracking algorithms led to first observation of the beam during Commissioning Run
SiliconLayers
Beampipe
Overlay of many events with pT>100MeVResiduals from Si
hitsto circle fit
cm
![Page 11: UK-CDF Ronan McNulty (Liverpool) on behalf of Glasgow, Liverpool, London, Oxford.](https://reader035.fdocuments.in/reader035/viewer/2022062307/5516021a550346cf6f8b5bd7/html5/thumbnails/11.jpg)
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
![Page 12: UK-CDF Ronan McNulty (Liverpool) on behalf of Glasgow, Liverpool, London, Oxford.](https://reader035.fdocuments.in/reader035/viewer/2022062307/5516021a550346cf6f8b5bd7/html5/thumbnails/12.jpg)
Barrel 0 Barrel 1 Barrel 2
R hits
R hits on
tracks
R v z for hits
on tracks
![Page 13: UK-CDF Ronan McNulty (Liverpool) on behalf of Glasgow, Liverpool, London, Oxford.](https://reader035.fdocuments.in/reader035/viewer/2022062307/5516021a550346cf6f8b5bd7/html5/thumbnails/13.jpg)
Silicon Alignment
Alignment vital for b tagging, B lifetimes, oscillations, CP violation, and searches
Perfect Alignment = 14m
Before =40m
After =15m
Impact Parameter (cm)
Impact Parameter (cm)
Impact Parameter (cm)
![Page 14: UK-CDF Ronan McNulty (Liverpool) on behalf of Glasgow, Liverpool, London, Oxford.](https://reader035.fdocuments.in/reader035/viewer/2022062307/5516021a550346cf6f8b5bd7/html5/thumbnails/14.jpg)
Level 3 Trigger
![Page 15: UK-CDF Ronan McNulty (Liverpool) on behalf of Glasgow, Liverpool, London, Oxford.](https://reader035.fdocuments.in/reader035/viewer/2022062307/5516021a550346cf6f8b5bd7/html5/thumbnails/15.jpg)
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
![Page 16: UK-CDF Ronan McNulty (Liverpool) on behalf of Glasgow, Liverpool, London, Oxford.](https://reader035.fdocuments.in/reader035/viewer/2022062307/5516021a550346cf6f8b5bd7/html5/thumbnails/16.jpg)
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.
![Page 17: UK-CDF Ronan McNulty (Liverpool) on behalf of Glasgow, Liverpool, London, Oxford.](https://reader035.fdocuments.in/reader035/viewer/2022062307/5516021a550346cf6f8b5bd7/html5/thumbnails/17.jpg)
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.
5dbAdministrators
7C++/Oracle physicist
40Application programmers
500UsersTools
![Page 18: UK-CDF Ronan McNulty (Liverpool) on behalf of Glasgow, Liverpool, London, Oxford.](https://reader035.fdocuments.in/reader035/viewer/2022062307/5516021a550346cf6f8b5bd7/html5/thumbnails/18.jpg)
Computing
• Coherent UK strategy on computing
• >1Petabyte 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
![Page 19: UK-CDF Ronan McNulty (Liverpool) on behalf of Glasgow, Liverpool, London, Oxford.](https://reader035.fdocuments.in/reader035/viewer/2022062307/5516021a550346cf6f8b5bd7/html5/thumbnails/19.jpg)
![Page 20: UK-CDF Ronan McNulty (Liverpool) on behalf of Glasgow, Liverpool, London, Oxford.](https://reader035.fdocuments.in/reader035/viewer/2022062307/5516021a550346cf6f8b5bd7/html5/thumbnails/20.jpg)
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)
![Page 21: UK-CDF Ronan McNulty (Liverpool) on behalf of Glasgow, Liverpool, London, Oxford.](https://reader035.fdocuments.in/reader035/viewer/2022062307/5516021a550346cf6f8b5bd7/html5/thumbnails/21.jpg)
Physics Analyses
• B physics: Lifetimes and Oscillations
• Electroweak Physics
• Searches: SUSY and Higgs
![Page 22: UK-CDF Ronan McNulty (Liverpool) on behalf of Glasgow, Liverpool, London, Oxford.](https://reader035.fdocuments.in/reader035/viewer/2022062307/5516021a550346cf6f8b5bd7/html5/thumbnails/22.jpg)
B lifetimes
• First measurements which CDF will perform in b sector
• Necessary step towards oscillation
• (Test of alignment, tracking, tagging.)
• Best measurement of Bs
0, b. (Unique)
HQET:
(B+ )/ (B0 )=1.05
( Bs0)/ (B0 )=1.00
(b)/ (B0 )=0.9 to 1.0
Experiment:
(b)/ (B0 ) is 0.78+-.04
![Page 23: UK-CDF Ronan McNulty (Liverpool) on behalf of Glasgow, Liverpool, London, Oxford.](https://reader035.fdocuments.in/reader035/viewer/2022062307/5516021a550346cf6f8b5bd7/html5/thumbnails/23.jpg)
B lifetimes
![Page 24: UK-CDF Ronan McNulty (Liverpool) on behalf of Glasgow, Liverpool, London, Oxford.](https://reader035.fdocuments.in/reader035/viewer/2022062307/5516021a550346cf6f8b5bd7/html5/thumbnails/24.jpg)
B lifetimeMillions of B mesons have already been produced in RunII.
Need to trigger and identify relevant decays. Leptons ‘easy’; hadrons difficult
Look for J/ Search for B+J/+
Run II data: tracks with Silicon hits
Run I data: UK thesis topic
![Page 25: UK-CDF Ronan McNulty (Liverpool) on behalf of Glasgow, Liverpool, London, Oxford.](https://reader035.fdocuments.in/reader035/viewer/2022062307/5516021a550346cf6f8b5bd7/html5/thumbnails/25.jpg)
Bs oscillations
PB(t) e-t(1+cos(m t))
• Lifetime measurements: prelude to oscillations
• For B mesons, Flavour eigenstates weak eigenstates
• So B0 B0
• Mixing parameter: x = m/
• LEP/Barbar: xd = 0.73
To date: xs > 14.6 Tevatron unique
• Usually measure by oscillating exponential; UK has developed new complementary method
![Page 26: UK-CDF Ronan McNulty (Liverpool) on behalf of Glasgow, Liverpool, London, Oxford.](https://reader035.fdocuments.in/reader035/viewer/2022062307/5516021a550346cf6f8b5bd7/html5/thumbnails/26.jpg)
B oscillations• m fL• Separate eigenstates and
measure each lifetime
1) BS DS+ DS
- (CP even) Work continuing in triggering on these difficult hadronic modes (track/vertex/reconstuct)
2) BS J/(CP even&odd)
Different angular distribution for allow separation of CP even and odd states
3) BS J/(CP odd)
![Page 27: UK-CDF Ronan McNulty (Liverpool) on behalf of Glasgow, Liverpool, London, Oxford.](https://reader035.fdocuments.in/reader035/viewer/2022062307/5516021a550346cf6f8b5bd7/html5/thumbnails/27.jpg)
B oscillationsSearch for BS J/UK Thesis with Run 1 data
Br.(BS J/)<8.75 x 10-4 at 90% c.l. (Prelim)
![Page 28: UK-CDF Ronan McNulty (Liverpool) on behalf of Glasgow, Liverpool, London, Oxford.](https://reader035.fdocuments.in/reader035/viewer/2022062307/5516021a550346cf6f8b5bd7/html5/thumbnails/28.jpg)
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
![Page 29: UK-CDF Ronan McNulty (Liverpool) on behalf of Glasgow, Liverpool, London, Oxford.](https://reader035.fdocuments.in/reader035/viewer/2022062307/5516021a550346cf6f8b5bd7/html5/thumbnails/29.jpg)
Electroweak Physics
![Page 30: UK-CDF Ronan McNulty (Liverpool) on behalf of Glasgow, Liverpool, London, Oxford.](https://reader035.fdocuments.in/reader035/viewer/2022062307/5516021a550346cf6f8b5bd7/html5/thumbnails/30.jpg)
Electroweak Physics
Z candidate
![Page 31: UK-CDF Ronan McNulty (Liverpool) on behalf of Glasgow, Liverpool, London, Oxford.](https://reader035.fdocuments.in/reader035/viewer/2022062307/5516021a550346cf6f8b5bd7/html5/thumbnails/31.jpg)
SUSY• Studying lepton spectra
for sensitivity to different SUSY models (eg. gluino pairs)
• Builds on electron/muon identification
• Specific search for chargino decays + 0
2 l
02 0
1 l l
• 3 leptons often enriched in taus
![Page 32: UK-CDF Ronan McNulty (Liverpool) on behalf of Glasgow, Liverpool, London, Oxford.](https://reader035.fdocuments.in/reader035/viewer/2022062307/5516021a550346cf6f8b5bd7/html5/thumbnails/32.jpg)
Higgs
Standard searches may exclude but not discover Higgs to 180GeV
Higgs search will be highlight of Run II for CDF/D0.
![Page 33: UK-CDF Ronan McNulty (Liverpool) on behalf of Glasgow, Liverpool, London, Oxford.](https://reader035.fdocuments.in/reader035/viewer/2022062307/5516021a550346cf6f8b5bd7/html5/thumbnails/33.jpg)
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
![Page 34: UK-CDF Ronan McNulty (Liverpool) on behalf of Glasgow, Liverpool, London, Oxford.](https://reader035.fdocuments.in/reader035/viewer/2022062307/5516021a550346cf6f8b5bd7/html5/thumbnails/34.jpg)
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.
CDF
55m
![Page 35: UK-CDF Ronan McNulty (Liverpool) on behalf of Glasgow, Liverpool, London, Oxford.](https://reader035.fdocuments.in/reader035/viewer/2022062307/5516021a550346cf6f8b5bd7/html5/thumbnails/35.jpg)
Higgs
![Page 36: UK-CDF Ronan McNulty (Liverpool) on behalf of Glasgow, Liverpool, London, Oxford.](https://reader035.fdocuments.in/reader035/viewer/2022062307/5516021a550346cf6f8b5bd7/html5/thumbnails/36.jpg)
UK CDF Personnel• Glasgow (2.6 FTE)
– S. d’Auria
– 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
![Page 37: UK-CDF Ronan McNulty (Liverpool) on behalf of Glasgow, Liverpool, London, Oxford.](https://reader035.fdocuments.in/reader035/viewer/2022062307/5516021a550346cf6f8b5bd7/html5/thumbnails/37.jpg)
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.
![Page 38: UK-CDF Ronan McNulty (Liverpool) on behalf of Glasgow, Liverpool, London, Oxford.](https://reader035.fdocuments.in/reader035/viewer/2022062307/5516021a550346cf6f8b5bd7/html5/thumbnails/38.jpg)
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.