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Task A: ZEUS 1999-2000. 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 - PowerPoint PPT Presentation
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Task A: ZEUS 1999-2000
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 Tiles5000 Wavelength-Shifter Light Guides and Correction Masks
Designed and Built FastClearTrigger Processor
Fast (15sec) Cluster Finder Electron Identification Kinematic Variables E-PZ
Beam Gas Rejection
Manufactured Optics forBarrel 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 Spokesman3 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 1992- Beam Vaccum graded 1997- P Energy 820-900 GeV 1997
1993 e- 1.09 0.58 0.541994 e- 1.08 0.41 0.28
e- 93-94 2.17 0.99 0.82
1994 e+ 5.11 3.3 3.021995 e+ 12.31 7.27 6.621996 e+ 17.16 11.27 10.711997 e+ 36.35 29.09 27.691999 e+ 28.54 21.58 19.682000 e+ 49.07 38.22 35.17
e+ 94-00 148.54 110.73 102.89
1998 e- 8.08 5.16 4.691999 e- 17.12 11.86 11.38
e- 98-99 25.2 17.02 16.07
Year
ZEUS lumi (pb-1)
HERA delivered
ZEUS on-tape
ZEUS analysis
O.S.U. Physics Analysis 1999-2000
Structure Function and High Q2
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
2W
2
2W
W MQ
MP
N.C. Dependence on 2Z
2
2
Z MQ
QP
- clear evidence for Z exchange in spacelike DIS
Death of a Leptoquark
Photoproduction
HERA basically is 2 colliders in one !
For low Q2 a nearly real photon exchange
P Collider
E 10-15 GeVW 80-120 GeV
Weizacker-Williams corrects to ‘real’ photon
Summary
- NLO calculation below data particularly in forward direction
- Fragmentation agrees with other experiments
D* Fragmentation Function
Subject Collaboration(s) CitationsTop Quark CDF/D0 393+389/690E/W Parameters LEP 251F2 Measurement ZEUS/H1 231/249Z Width Delphi/Aleph/Opal/L3 241/237/222/210Large Rapidity Gap ZEUS/H1 227/267W Boson Mass CDF 191
tot(p) ZEUS/H1 150/122Jet Production CDF 133High x,Q2 ZEUS/H1 121/119Jet Production OPAL 114
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 2000 - 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 xF3
xF3 parity violating term from Z0 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 Q2 high x physics