U of O's Experimental High Energy Physics Group

The experimental high energy physics group at the University of Oregon carries on a vigorous program of research on:

International Linear Collider (ILC)
BaBar at SLAC
LIGO at Hanford

In the past, we collaborated on:

NuTeV (E-815) at Fermilab
RPCs at UofO


ATLAS is one of two general-purpose detectors at the LHC at CERN. The Oregon group has devoted its effort to the High Level Trigger, particularly in the area of the tracking-based tau trigger. As the ATLAS detector collects data from collisions, and data analysis becomes possible, the Oregon group plans to explore the general theme of electroweak symmetry breaking through tau physics, heavy Z boson searches, and black hole production.

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The International Linear Collider is a proposed future international particle accelerator. It would create high-energy particle collisions between electrons and positrons to explore the nature of space, time, matter, and energy. The ILC will be designed, funded, managed and operated as an international scientific project.

The Oregon group works with the American Linear Collider Physics Group and the World Wide Study. The group works specifically on Calorimeters, Vertex Detectors, and IP Beam Instrumentation.

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BaBar sits in the interaction point of the PEP-II collider ("B Factory"), pursuing a broad agenda of physics involving the heavy quark and heavy lepton sector. Foremost on this agenda is the study of the small violations of an approximate symmetry of nature known as CP symmetry. This symmetry relates matter to antimatter. The small violations are clues to why the universe has matter in it but very little antimatter.

See RPC for research being conducted at the UofO.

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LIGO is the laser interferometer gravitational wave observatory being built by Caltech and MIT in Washington State and Louisiana. The LIGO Scientific Collaboration (to which Oregon belongs) will search for gravitational radiation with this pioneering facility. (See LIGO at UO)

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E-815/NuTeV studies neutrino-induced charged current and neutral current interactions at high energy with the upgraded CCFR detector at Fermilab. The experiment used a new sign-selected beam to achieve unprecedented accuracy for measurements of the weak mixing angle in neutrino interactions. The experiment ran during 1996-97 and exceeded data collection goals. Analysis is in progress and first results have been presented.

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Undergraduate research at the UofO studies the declining efficiencies of the BaBar RPCs. The immediate cause of the chamber ineffciency is not yet understood, although we have two possible models which are consistent with most of the observations

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The SLD experiment at SLAC was the only polarized electron-positron annihilation HEP experiment in the world. Polarized Zo's were produced in the detector and the resulting decays allowed SLD to make the world's most precise measurement of the couplings of electrons and positrons to the Z boson, as well as to measure other physics parameters, such as the branching fraction of Z to b, anti-b (Rb), the c and b quark asymmetries (Ac and Ab), mixing in the B meson system, and numerous measurements of QCD. The Oregon effort included building and operating the SLD luminosity monitor and collaboration on the SLD vertex detector.

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The Oregon OPAL group collaborated on the luminosity monitor upgrade to a silicon-tungsten calorimeter. Oregon contributed to the construction, commissioning, and writing reconstruction software for this calorimeter. Now OPAL at CERN is exploring the highest energy e- e+ collisions ever, studying W and Z pair production, and looking for new physics.

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Theoretical High Energy Physics

CHEP Faculty

CHEP Staff

chep@ uoregon.edu