Task A: ZEUS 1999-2000 N. Brummer, B. Bylsma, L.S. Durkin, J. Gilmore, C. Ginsburg, C.L. Kim, T.Y. Ling.

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Presentation transcript:

Task A: ZEUS N. Brummer, B. Bylsma, L.S. Durkin, J. Gilmore, C. Ginsburg, C.L. Kim, T.Y. Ling

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

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 !

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

O.S.U. Physics Analysis 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

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

Death of a Leptoquark

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

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

Top Ten Collider Physics Journal Citations (1998)

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 improve beampipe vaccuum - install short focusing quad near interaction region

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

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

Physics with Polarized Beams

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