1. Task A: ZEUS 1999-2000 N. Brummer, B. Bylsma, L.S. Durkin, J. Gilmore, C. Ginsburg, C.L. Kim, 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-P Z Beam Gas Rejection Manufactured Optics for Barrel Calorimeter Presampler

3. Group History on ZEUS (cont.) Monte Carlo Production Sole U.S. University to provide Computer Time Farm updated in 1998 to 15 Linux PC’s increasing output by 6X Administrative U.S. ZEUS Spokesman 3 Physics Coordinators Run 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. Assist. 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 820-900 GeV 1997

5. O.S.U. Physics Analysis 1999-2000 Structure Function and High Q 2 Camille Ginsburg, Physics Coordinator Contact Interactions Jason Gilmore, Thesis Inclusive D * Photoproduction Cross Section C.L. Kim, Main Analysis Total Photoproduction Cross Section Camille Ginsburg, Main Analysis

11. N.C. Dependence on - clear evidence for Z exchange in spacelike DIS

13. Death of a Leptoquark

18. Photoproduction HERA basically is 2 colliders in one ! For low Q 2 a nearly real photon exchange  P Collider E  10-15 GeV W 80-120 GeV Weizacker-Williams corrects to ‘real’ photon

22. Summary - NLO calculation below data particularly in forward direction - Fragmentation agrees with other experiments D * Fragmentation Function

26. Top Ten Collider Physics Journal Citations (1998)

27. 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 Starting Sept 2000 - improve beampipe vaccuum - install short focusing quad near interaction region

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

29. With 1000 pb -1 this will be a Precsion Measurement ! Extraction of xF 3 xF 3 parity violating term from Z 0 exchange

30. Physics with Polarized Beams

31. Future ZEUS has produced quality physics in the last eight years HERA is undergoing a major luminosity upgrade beginning in September The Ohio State Group will continue to analyse new data during the shutdown With the new luminosity this group will continue to study high Q 2 high x physics