Bulletin of the American Physical Society
2008 Annual Meeting of the Division of Nuclear Physics
Volume 53, Number 12
Thursday–Sunday, October 23–26, 2008; Oakland, California
Session HA: Topics in Nucleon Structure |
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Chair: Zein-Eddine Meziani, Temple University Room: Simmons Ballroom 2-3 |
Saturday, October 25, 2008 2:00PM - 2:36PM |
HA.00001: Nucleon Structure: A Theoretical Overview Invited Speaker: This talk gives an overview of recent progress in nucleon structure studies with electromagnetic probes. Recent experimental data in elastic electron-nucleon scattering both at low and large momentum transfers will be discussed. The challenges which these precision measurements present for our theoretical understanding of nucleon structure will be outlined, and the role of two-photon exchange corrections in the extraction of elastic nucleon form factors will be highlighted. The current empirical information on the nucleon electromagnetic form factors will be used to map out the transverse charge densities in proton and neutron. Subsequently, a comprehensive framework for describing the quark and gluon structure of the nucleon, based on the concept of Generalized Parton Distributions (GPDs), will be reviewed. It will be discussed how the GPDs describe correlations between the momentum and spatial distributions of quarks, which are revealed in exclusive processes at large momentum transfers, such as the deeply virtual Compton scattering process on the nucleon. The first dedicated experiments in the field of hard exclusive processes, performed over the past few years, will be reviewed as well as the theoretical progress and perspectives. [Preview Abstract] |
Saturday, October 25, 2008 2:36PM - 3:12PM |
HA.00002: Overview of nucleon form factor measurements Invited Speaker: The promise of high current and high polarization electron beams has been realized in the precision measurements of space-like proton and neutron magnetic and electric form factors. Experiments have utilized various combinations of polarized targets, recoil polarimetry and large acceptance detectors to measure the form factors. Experimentally, the strange content of the nucleon form factor has been probed by measuring beam asymmetries in parity violating electron scattering. New measurements of the proton form factor in the time-like region have been done. All this new data has had a tremendous impact on our understanding of nucleon structure. An overview of present status of nucleon form factor measurements will be presented. [Preview Abstract] |
Saturday, October 25, 2008 3:12PM - 3:48PM |
HA.00003: Transition Form Factors at JLab: A Unique Tool to Study the Evolution of the Strong Interaction Invited Speaker: Understanding the strong interaction in the non-perturbative regime constitutes one of the biggest challenges in fundamental science that we can and have to tackle now as the needed experimental and theoretical tools become available. Perturbative Quantum ChromoDynamics (pQCD) at small distances, which is governed by quark and gluon fields, and Chiral Perturbation Theory (ChPT) at larger distances, which is governed by pion fields, are both already experimentally validated. However, strong fields at intermediate distances, where they generate about 98{\%} of the total mass of nucleons and therefore of all normal matter, are not understood on similarly firm grounds. Nucleon (N) to excited nucleon (N*) transition form factors at Jefferson Lab, and in particular with the 12 GeV upgrade, serve as an ideal tool to investigate the evolution of the strong interaction in this intermediate region. The experimental and theoretical status of the research program at Jefferson Lab to study baryon transition form factors and hence the evolution of the underlying effective degrees of freedom, or the origin of mass, will be exemplified by recent results. A thoroughly consistent extraction of resonance parameters within various different models from high precision data in various exclusive production channels will be present. [Preview Abstract] |
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