CLEO Experiment at CESR
J. J. Thaler,* B. I. Eisenstein, G. E. Gladding, G. D. Gollin, I. Karliner, M. A. Selen, J. A. Ernst, M. J. Haney, R. Hans, M. A. Palmer, T. J. Bergfeld, J. Buckley, C. Sedlack, M. Marsh, E. Johnson, C. Plager, J. Williams
U.S. Department of Energy, DE-FG02-91ER40677

The CLEO experiment at the Cornell electron positron storage ring (CESR) studies the properties of the bottom and charmed quarks and the tau lepton. The primary goals of these studies are: (1) the understanding of the origin of the Cabibbo-Kobayashi-Maskawa (CKM) mixing matrix, for which no dynamical theory exists; (2) understanding of time reversal symmetry violation, which appears to be a necessary prerequisite to the observed matter-antimatter asymmetry of the universe; and (3) tests of the 'standard model' of particle physics, whose very precise predictions have been tested very accurately, but which, nonetheless, is known not to be correct. Deviations from these predictions will tell us where the flaw lies.

Collider Detector at Fermilab
T. Liss,* N. Eddy, D. Errede, S. Errede, M. Kasten, P. Singh, V. J. Simaitis, L. Christofek, K. Lannon, J. Strologas, K. Pitts, T. Vickey, R. Bryne, H. Kim in collaboration with physicists of the CDF group at Fermilab
Fermilab

The superconducting particle accelerator at Fermilab is used to store beams of protons and antiprotons at 1000 GeV, the world's highest energy. The CDF group has built a large detector to investigate the nature of the interactions that occur when these beams collide head-on. Precise measurements of the properties of the W boson, top quark, and other elementary particles are being made.

Elementary Particle Experiment
T. Liss,* J. J. Thaler,* B. Eisenstein, D. Errede, S. Errede, G. Gladding, G. Gollin, I. Karliner, M. A. Selen, J. E. Wiss, N. Eddy, J. A. Ernst, E. Gottschalk, M. J. Haney, R. Hans, M. Kasten, M. A. Palmer, R. Roser, V. J. Simaitis, P. Singh, T. J. Bergfeld, J. Buckley, L. Christofek, K. Lannon, C. Sedlack, J. Strologas, M. Marsh, E. Johnson, C. Plager, J. Williams, A. Rahimi, K. Park, C. A. Cawlfield
U. S. Department of Energy, DE-FG02-91ER40677

The two main thrusts of high-energy physics research are to determine the form and strength of the fundamental interactions in nature and to determine the properties of the particles that enter into these interactions. The two main thrusts of elementary particle physics research are to determine the form and strength of the fundamental interactions in nature and to determine the properties of the particles that enter into these interactions. Our group presently works on experiments at Fermilab, Cornell University, and CERN. We participated in the discovery of the top quark and expect to observe time reversal symmetry violation in B-meson decays. In the future, we hope to observe the Higgs boson, thought to be responsible for the existence of mass.

High-Energy Photoproduction
J. Wiss,* D. Kim, C. Cawlfield, A. Rahimi, E. Seiler in collaboration with physicists from other institutions
University of Illinois

We study charmed particles produced by high-energy photons. We completed data taking at Fermilab in the summer of 1997 after amassing a reconstructed charm sample of over 1 million events. We are using our unparalleled sample of charm particles to study rare or forbidden charm decays, charm mixing phenomena, charm lifetimes, the spectroscopy of excited charm states, and QCD based models for charm photoproduction and decay. The Illinois group has made major contributions to the FOCUS hardware, software, and data analysis.

Study of Heavy Flavors at the Cornell Electron Storage Ring (CESR)
J. Ernst, B. Eisenstein, T. Bergfeld, G. Gladding, G. Gollin, I. Karliner, M. Selen, J. J. Thaler, M. Haney, E. Johnson, M. Marsh, M. A. Palmer, R. Hans, J. Williams, C. Sedlack
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We use the CLEO detector at CESR to study the properties of the lepton and of particles containing the b and c quarks. These studies allow us to perform stringent tests of the standard model of the fundamental interactions. This is the modern equivalent of the atomic physics experiments performed early this century to test quantum mechanics. We are participating in a major upgrade of the CLEO detector, which will effect dramatic improvements in the experiment's resolution and statistical precision. One of our goals is to determine whether or not the standard model can account for the small matter-antimatter asymmetry present in our universe.

Summary of ATLAS High-Energy Physics Research at the U of I
D. Errede,* S. Errede,* J. J. Thaler*
U.S. Department of Energy, BNL-4907

The ATLAS experiment at the Large Hadron Collider (LHC) will study very high energy proton-proton collisions to provide insight into the nature of electroweak symmetry breaking. Present efforts include construction of hadron calorimeter modules and studies of the performance of photomultiplier tubes to be used in the readout of the calorimeter.