Bulletin of the American Physical Society
2006 73rd Annual Meeting of the Southeastern Section of the APS
Thursday–Saturday, November 9–11, 2006; Williamsburg, Virginia
Session HA: Jefferson Lab: Plans for the Future |
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Chair: Anthony W. Thomas, Thomas Jefferson National Accelerator Facility Room: Williamsburg Hospitality House Empire A/B |
Friday, November 10, 2006 10:15AM - 10:51AM |
HA.00001: Overview of the 12GeV Upgrade at Jefferson Lab Invited Speaker: In February of this year the Secretary of Energy announced CD-1 for the 12 GeV Upgrade at Jefferson Lab. I will describe the key elements of this Upgrade, as well as the progress made thus far. As this project will enable major advances in our understanding of the strong force, I will also describe a sample of the key experimental measurements which we intend to carry out in the first five years of operation. [Preview Abstract] |
Friday, November 10, 2006 10:51AM - 11:27AM |
HA.00002: Tomography of the Proton. Invited Speaker: The discovery of the Generalized Parton Distributions (GPDs) in the mid 1990's is revolutionizing our way of thinking about the intrinsic structure of the proton. Previously, the structure of the proton was studied through its charge and current distribution in exclusive and elastic electron scattering described by electromagnetic and electroweak form factors, and independently through parton distribution functions obtained in deep inelastic inclusive processes. The profound relationship between these orthogonal descriptions of the proton was hidden due to the lack of a framework that would connect these descriptions in a theoretically consistent way. The GPDs provide a transparent description of this connection, and opened up a new avenue of research that will bring us closer to the ultimate goal of determining the proton's wave function. The concept of GPDs will be introduced at an elementary level from an experimentalist's perspective, and the first pioneering measurements, such as deeply virtual Compton scattering, will be discussed. These experiments are an important first step in getting access to these new distribution functions. Finally, an outlook at the future of this new area of fundamental research at the energy-doubled CEBAF electron accelerator at Jefferson Lab will be presented. [Preview Abstract] |
Friday, November 10, 2006 11:27AM - 12:03PM |
HA.00003: Mapping the Spectrum of Gluonic Excitations with Photons: The GlueX Project at Jefferson Lab Invited Speaker: Understanding the confinement of quarks and gluons in QCD requires an understanding of the soft gluonic field -- the clearest experimental manifestation of which is the spectrum of exotic hybrid mesons. These exotic mesons carry J$^{PC}$ quantum numbers that are not possible for a simple quark -- antiquark bound state but are possible when the gluonic degrees of freedom are included. There are tantalizing indications from existing data that exotic mesons do indeed exist but a mapping of their spectrum requires high quality data with a probe that is more likely to produce exotic hybrids. The GlueX detector design is optimized for the amplitude analyses to identify these states in multiple decay modes. It will also use a linearly polarized 9 GeV photon beam. Indeed, photons are expected to particularly efficient at producing exotic hybrids but to date photon beams of sufficient quality (flux, degree of polarization, spot size) have not been possible. The 12 GeV upgrade of the CEBAF accelerator at JLab, along with the construction of a new beam line and experimental hall (Hall D) to house the GlueX detector will provide the data needed to carry out this mapping of the exotic hybrid spectrum. The first two years of data-taking will result in a data set that exceeds existing data from photoproduction by several orders of magnitude. This talk will review the current experimental information on exotic mesons and the GlueX project goals and status. [Preview Abstract] |
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