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Double-spin asymmetries of semi-inclusive cross sections for the productionof identified pions and kaons have been measured in deep-inelastic scatteringof polarized positrons on a polarized deuterium target. Five helicitydistributions including those for three sea quark flavors were extracted fromthese data together with re-analyzed previous data for identified pions from ahydrogen target. These distributions are consistent with zero for all three seaflavors. A recently predicted flavor asymmetry in the polarization of the lightquark sea appears to be disfavored by the data.Comment: 5 pages, 3 figure

Flavor Decomposition of the Sea-Quark Helicity Distributions in the Nucleon from Semiinclusive Deep Inelastic Scattering