Task A: ZEUS 2002-2003 N. Brummer, L.S. Durkin, A. Lee, T.Y. Ling.

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Presentation transcript:

Task A: ZEUS 2002-2003 N. Brummer, L.S. Durkin, A. Lee, 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-PZ Beam Gas Rejection Manufactured Optics for Barrel Calorimeter Presampler

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 !

HERA Luminosity - First Interaction 1992 - Beam Vaccum graded 1997 - P Energy 820-900 GeV 1997

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

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

Search for R-Parity Violating SUSY particles

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

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 2001-2002 understand these backgrounds Jan 2003-June 2003 shutdown Improve vaccuum Rebuild collimators Redo absorbers and coatings Luminosity Run Starts Sept. 29

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 !

Physics with Polarized Beams

Sea Quarks well Measure, Valence Quarks Statistically Limited

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