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HK: Fachverband Hadronen und Kerne

HK 78: Plenary IX

HK 78.2: Invited Talk

Friday, March 20, 2009, 09:30–10:00, Audi-Max

Field Theory in Hadron Physics — •Marc Vanderhaeghen — Institut fuer Kernphysik, Univ. Mainz, Germany

This talk gives an overview of recent progress in hadron structure from a field theoretic perspective.

Recent experimental data in elastic electron-nucleon scattering both at low and large momentum transfers will be discussed. The current precision measurements on the nucleon electromagnetic form factors will be used to map out the transverse charge densities in proton and neutron. The framework will be extended to map out charge densities in higher spin systems, such as the deuteron and nucleon resonances. It will be shown how a field theoretic consistent picture emerges both of densities and of the shape of a relativistic many body system.

Subsequently, a comprehensive framework for describing the quark and gluon structure of hadrons, 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. The first dedicated experiments in the field of hard exclusive processes, performed over the past few years, will be reviewed and the theoretical progress and experimental perspectives will be discussed.