Speaker: Werner Vogelsang (Brookheaven National Lab.)

Title: Helicity Parton Distributions of the Nucleon

Abstract:
Three decades of experiments in polarized deep inelastic
scattering (DIS) have provided important and exciting information
on the spin structure of the nucleon. Much has become known
about the nucleon's quark and anti-quark helicity distributions,
and pp collisions at RHIC are now giving insights into the
polarized gluon distribution.
The talk describes theoretical work on the helicity distributions,
in particular related to the RHIC spin program and to the
determination of gluon polarization. It also discusses
recent progress towards a joint "global" analysis of the
helicity distributions from the DIS and RHIC data.