Bulletin of the American Physical Society
2008 APS April Meeting and HEDP/HEDLA Meeting
Volume 53, Number 5
Friday–Tuesday, April 11–15, 2008; St. Louis, Missouri
Session H3: The Long Distance Structure of the Nucleon |
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Sponsoring Units: DNP Chair: Richard Milner, Massachusetts Institute of Technology Room: Hyatt Regency St. Louis Riverfront (formerly Adam's Mark Hotel), St. Louis E |
Sunday, April 13, 2008 8:30AM - 9:06AM |
H3.00001: Long-Distance Nucleon Structure: Theoretical Overview Invited Speaker: The electroweak form factors of the nucleon will be discussed, including the electromagnetic form factors extracted from parity-conserving electron scattering from the proton and from light nuclei, the axial-vector form factor from weak interaction studies and the strangeness form factors which can play a role in parity-violating electron scattering. The focus will be placed on what can be learned about the long-distance structure of the nucleon. Several issues of interpretation will also be discussed: higher-order electroweak contributions, problems of interpretation in coordinate space and uncertainties which arise in the case of the neutron where inevitably nuclear structure problems arise. [Preview Abstract] |
Sunday, April 13, 2008 9:06AM - 9:42AM |
H3.00002: Elastic form factor measurements at Mainz. Invited Speaker: The precision of measurements of the form factors of the nucleon has greatly improved over the last decade. At large four-momentum transfers $Q^2$ the new investigations at Jlab have shown highly significant deviations from the celebrated dipole shape considered until recently as a prove of the vector dominance model. At low $Q^2$ the possibility of a long wave length bump/dip structure has stirred a controversy. In a visual picture in the Breit frame such a structure would indicate a charge contribution extending out to radii larger than 1\,fm at variance with some popular models of the nucleon. But, such a charge would also be in clear contradiction to the best dispersion relation description. In this talk a summary of this situation will be given and new yet unpublished results from the Mainz Microtron MAMI for the electric form factor of the proton aiming at a clarification of the bump/dip structure will be presented. It shows that the low as well as the high $Q^2$ data are important for the study of the long distance structure of the nucleon. [Preview Abstract] |
Sunday, April 13, 2008 9:42AM - 10:18AM |
H3.00003: New Results from BLAST at MIT-Bates Invited Speaker: The BLAST experiment was designed to study in a systematic manner the spin-dependent electromagnetic interaction on few-body nuclei. Utilizing the polarized electron beam in the MIT-Bates South Hall Storage Ring, highly-polarized isotopically pure targets of hydrogen and deuterium, and the symmetric toroidal BLAST detector; precise measurements have been made which permit the extraction of the proton and neutron electric and magnetic form factors. The neutron electric form factor especially is now known to a precision comparable to that of the other nucleon form factors. In this talk, I will present these measurements, as well as their transform into spatial coordinates. [Preview Abstract] |
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