Task A: ZEUS N. Brummer, L.S. Durkin, A. Lee, T.Y. Ling
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1 Task A: ZEUS N. Brummer, L.S. Durkin, A. Lee, T.Y. Ling ZEUS
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 (15µsec) Cluster Finder Electron Identification Kinematic Variables E-P Z 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 Beam Vaccum graded P Energy GeV 1997 HERA luminosity Integrated Luminosity (pb -1 ) e e Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Year HERA delivered ZEUS lumi (pb -1 ) ZEUS on-tape ZEUS analysis 1993 e e e e e e e e e e e e e I(p)/mA I(e)/mA L sp /10 29 L peak / e-p e+p e-p e+p Year
5 Personnel 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 Structure Function and High Q 2 Camille Ginsburg, Physics Coordinator Contact Interactions Jason Gilmore, Thesis Limits on Production of R-Parity Violating SUSY particles Nicole Brümmer
7
8
9 log Q H1 + ZEUS HERMES E665 3 BCDMS CCFR y = SLAC NMC 0-1 y = log x
10 dσ/dq 2 (pb / GeV 2 ) ZEUS DIS Cross Sections e + p e - p (prelim) CTEQ 4D neutral current charged current Q 2 (GeV 2 )
11 F em 2 -log 10 x 6 5 ZEUS ZEUS 96/97 Fixed Target NLO QCD Fit Q 2 (GeV 2 )
12 Search for R-Parity Violating SUSY particles
13 events Mass (GeV) λ' 1j ZEUS Preliminary µ M M(χ 0 1)>40 GeV tanβ=2 tanβ= M squark (GeV)
14 HERA has NOT Met Lumiosity Expectations Quotes Circa pb -1 /ZEUS YEAR the MC Contains 1000 pb -1 worth of data HERA Luminosity Upgrade 7X Increase 10 Months Shutdown Sept 2000-July x 185 µm -> 30x110 µm a factor of 2.8 TOP VIEW OF THE IR WITH STRETCHED TRANSVERSE SCALE New types of septum quadrupolesto focus proton beam S.C. Magnets inside detectors 240m complicated Vacuum systems
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 Study ofbeam-inducedbackgroundsin the ZEUS detectorfrom 2002 HERA running Version1.0,26/Sep/2002 ZEUS Background W orkinggroup D. Bailey,G. Barbagli, I.Bloch 1,N. Brummer,A. Bruni,R.Carlin, C. Catterall, S.Chekanov,J.Cole,N. Coppola,J.Fourleto va, S.Goers,T.Haas 1,R.Hall-Wilton, J.Hamilton,D. Kcira, K. Klimek,U. Koetz,M. Kuze 1,G. Levman,B.Loehr, E.Lohrmann,J.Loizides, S.Padhi,S.Paganis, R. Renner, S.Schlenstedt, W. Schmidke,U. Schneekloth 1,M. Sutton 1,E.Tassi, K. Tokushuku,T. Tsurugai, G. W olf,y. Yamazaki 1,W. Zeuner Jan 2003-June 2003 shutdown Improve vaccuum Rebuild collimators Redo absorbers and coatings Luminosity Run Starts Sept. 29
16 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 Polarization [%] Physics with Polarised Beams e p ν X Colliding Bunches Non-Colliding Bunches Bunch Number - Charged Current: Charged Current Cross Section / pb e - p σ CC ± e p ( 1± P) P = polarisation Resolution on M W 80 MeV e + p Polarization Exclusion limit M W (R) > 400 GeV First measurement: Possible with ONE years data
18 Sea Quarks well Measure, Valence Quarks Statistically Limited ZEUS NC xf x = 0.56 PRELIMINARY NC DATA ( ) CTEQ4D NLO MRST (99) xf x = Q 2 [GeV 2 ]
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 Q 2 high x physics
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