Bulletin of the American Physical Society
2005 APS April Meeting
Saturday–Tuesday, April 16–19, 2005; Tampa, FL
Session Q0: Plenary Talks II |
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Chair: Charles Glashausser, Rutgers University Room: Marriott Tampa Waterside Grand Salon E/F |
Monday, April 18, 2005 8:30AM - 9:06AM |
Q0.00001: Probing Supernova Remnants, Black Holes, and Dark Matter with TeV Gamma Rays Invited Speaker: I will discuss the recent exciting discoveries of TeV gamma-rays from objects representing several galactic and extragalactic source populations, and highlight the astrophysical and cosmological implications of these discoveries in the context of (1) the century-old problem of origin of Galactic Cosmic Rays, (2) Physics and Astrophysics of Black Holes, and (3) cosmological problems related to the Diffuse Extragalactic Background Radiation as well as to the nonbaryonic Dark Matter. [Preview Abstract] |
Monday, April 18, 2005 9:06AM - 9:42AM |
Q0.00002: Physics of Nanoscale Structures: New Insights and Possibilities Invited Speaker: This abstract has not been submitted yet. [Preview Abstract] |
Monday, April 18, 2005 9:42AM - 10:18AM |
Q0.00003: Probing Subatomic Matter with Polarized Electrons: MeV to TeV Physics Invited Speaker: The study of weak neutral current (WNC) interactions, mediated by the Z$^{0}$ boson, plays a central role in tests of the electroweak and strong interactions. In fixed target electron scattering, the WNC amplitude can be isolated by measuring the fractional difference in the scattering rate for incident right- and left-handed longitudinally polarized relativistic electrons on unpolarized nuclear targets. A non-zero asymmetry, a signature of violation of parity symmetry, is dominated by the ratio of the WNC amplitude to the electromagnetic amplitude. Depending on the length scale being probed in specific reactions, asymmetries range from 100 parts per million (ppm) to as small as 0.1 ppm. Over the past 3 decades, the technology for measuring such small asymmetries has steadily improved, making it feasible to address a variety of fundamental questions in nuclear and particle physics. With judicious choice of kinematics and targets, various experiments have been designed to probe the role of virtual strange quarks in the nucleons's charge and magnetization distributions, to obtain a measure of the ground-state neutron distribution of a heavy, spinless nucleus and to test the gauge structure of the WNC interaction itself, in a manner complementary to high energy collider experiments. After a brief historical overview, new results in parity-violating electron scattering from experiments at the Stanford Linear Accelerator Center and the Thomas Jefferson National Accelerator Facility and their implications will be presented. The potential impact of ongoing experiments will be reviewed and new ideas for future accelerator facilities will be discussed. [Preview Abstract] |
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