1. Task A: ZEUS
N. Brummer, L.S. Durkin,
A. Lee, T.Y. Ling

2. O.S.U. History on ZEUS Joined ZEUS 1985
One of U.S. ZEUS founding members
Designed and Built Optics
for ZEUS Barrel Calorimeter
87,000 Scintillator Tiles
5000 Wavelength-Shifter
Light Guides and
Correction Masks
Designed and Built FastClear
Trigger Processor
Fast (15sec) Cluster Finder
Electron Identification
Kinematic Variables E-PZ
Beam Gas Rejection
Manufactured Optics for
Barrel Calorimeter Presampler

3. Group History on ZEUS (cont.)
Administrative
U.S. ZEUS Spokesman
3 Physics Coordinators
Run Coordinator
Trigger Coordinator
Post-Doctoral Fellows
B. Bylsma, C.L.Kim, C. Ginsburg,
N.Brummer K. McLean, B. Murray,
S. Park, I. Park, D. Acosta
Physics Chair Assist. Prof Assoc. Prof.
Korea U Kyungpook U U. of Florida
3 faculty Positions out of 5 postdocs !

4. HERA Luminosity - First Interaction 1992 - Beam Vaccum graded 1997
- P Energy GeV 1997

5. Personnel 2002-2003 OSU ZEUS Effort is Bare Bones
- Nicole Brummer (100%) at DESY
Trigger Coordinator
- Grad Student Albert Lee at DESY

6. O.S.U. Physics Analysis 2000-2003 Structure Function and High Q2
Camille Ginsburg, Physics Coordinator
Contact Interactions
Jason Gilmore, Thesis
Limits on Production of R-Parity Violating
SUSY particles
Nicole Brümmer

12. Search for R-Parity Violating SUSY particles

14. HERA Luminosity Upgrade 7X Increase
HERA has NOT Met Lumiosity Expectations
Quotes Circa 1987
“ 100 pb-1 /ZEUS YEAR”
“ the MC Contains 1000 pb -1 worth of data”
HERA Luminosity Upgrade 7X Increase
10 Months Shutdown Sept 2000-July 2001
50 x 185 m -> 30x110 m a factor of 2.8

15. HERA II-Luminosity Upgrade Problems
Shifts Started September 2000
ZEUS and H1 Plagued with Beam Backgrounds
- synchrotron radiation
back scatter off beam pipe Y
- p beam gas
- electron beam gas
understand these backgrounds
Jan 2003-June 2003 shutdown
Improve vaccuum
Rebuild collimators
Redo absorbers and coatings
Luminosity Run Starts Sept. 29

16. With 7X Luminosity New Physics Analyses will be Possible !
ZEUS Detector Upgrades
- Silicon Vertex Chamber
- Straw Tube Tracking Chambers
Fast Clear will be Important
With 7X Luminosity New Physics
Analyses will be Possible !

17. Physics with Polarized Beams

18. Sea Quarks well Measure, Valence Quarks Statistically Limited

19. Future ZEUS has produced quality physics in the last twelve years
HERA has completed a major luminosity upgrade
problems are being worked on
The Ohio State Group worked to understand
accelerator backgrounds
The Ohio State Group had continued to analyze new
data during the shutdown
With the new luminosity this group will continue to
study high Q2 high x physics