2023 Impact factor 4.2
Particles and Fields
Eur. Phys. J. C 14, 147-157
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

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 $\Delta\bar u(x) - \Delta\bar d (x)$and $\Delta\bar u(x) + \Delta\bar d (x) - 2 \Delta \bar s (x)$. 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