Hermes Studies of the Nucleon Spin

Details Hermes Studies of the Nucleon Spin Hermes Studies of the Nucleon Spin

Feb 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003fuin.conf..402w&link_type=abstract

FUNDAMENTAL INTERACTIONS. Proceedings of the Seventeenth Lake Louise Winter Institute. Held 17-23 February 2002 in Lake Louise,

Physics

Scientific paper

The HERMES collaboration has measured double spin asymmetries using polarized deep inelastic scattering. The spin structure functions g1 of the proton, the neutron, and the deuteron calculated from inclusive asymmetries are in agreement with world data. Quark polarizations were extracted from inclusive and semi-inclusive spin asymmetries. The polarization of the up quark is positive, the polarization of the down quark negative, and the sea polarization is consistent with zero. First measurements of hard exclusive electro-production of real photons (DVCS) can be interpreted in terms of the recently developed generalized parton distribution functions.

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