Friday, June 27, 2003, 16:00
WHGA Auditorium
Prof. K. Rith, Univ. Erlangen
Abstract:
Since the observation of the European Muon Collaboration that only a
small fraction of the nucleon spin can be attributed to the spins of the
quarks, the spin structure of the nucleon has been studied in detail by
several polarised deep-inelastic lepton nucleon scattering experiments.
The results of these experiments and the prospects for future
experiments will be reviewed with special emphasis of
the HERMES experiment at HERA, which uses a polarised atomic gas target
internal to the HERA electron storage ring. These data represent the
world's most precise experimental determination to date of the separate
contributions of the spins of the up, down and strange quarks to
the spin of the nucleon, and the first indication of a positive
gluon polarisation.