DOI 10.1007/s100520000329
Flavor asymmetry of polarized antiquark distributions and semi-inclusive DIS
B. Dressler1 - K. Goeke1 - M.V. Polyakov1,2 - C. Weiss1
1 Institut für Theoretische Physik II,
Ruhr-Universität Bochum, 44780 Bochum, Germany
2 Petersburg Nuclear Physics Institute, Gatchina,
St.Petersburg 188350, Russia
Received: 30 November 1999 / Published online: 17 March 2000 - © Springer-Verlag 2000
Abstract
The 1/Nc-expansion of QCD suggests large flavor asymmetries of the
polarized antiquark distributions in the nucleon. This is confirmed
by model calculations in the large-Nc limit (chiral quark-soliton
model), which give sizable results for
and
.
We compute the contributions of these flavor asymmetries
to the spin asymmetries in hadron production in semi-inclusive
deep-inelastic scattering. We show that the large flavor asymmetries
predicted by the chiral quark-soliton model are consistent with the
recent HERMES data for spin asymmetries in charged hadron production.
Copyright Società Italiana di Fisica, Springer-Verlag 2000
