Bochum 2009 – scientific programme

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HK: Fachverband Hadronen und Kerne

HK 70: Hadron Structure and Spectroscopy II

HK 70.2: Invited Group Report

Thursday, March 19, 2009, 17:00–17:30, H-ZO 30

Overview of recent HERMES results — •Charlotte Van Hulse — Gent University - Department of Subatomic and Radiation Physics-Proeftuinstraat 86, 9000 Gent - Belgium

In the last decade, the HERMES experiment has expanded its program of measuring the quark spin contribution to the nucleon spin, towards forming three dimensional pictures of the partonic structure of the nucleon. These are described in terms of transverse momentum distributions and generalized parton distributions. The former distributions can be accessed by analyzing azimuthal asymmetries in the semi-inclusive deep-inelastic cross section, while the latter can be constrained by the analysis of azimuthal asymmetries in exclusive reactions.

An overview will be given on recent HERMES results on such asymmetries in exclusive real photon and meson production as well as in inclusive and semi-inclusive deep-inelastic scattering. This overview will be supplemented by results on the strange quark distribution and polarization.