Flavor decomposition of the sea quark helicity distributions in the nucleon from semi-inclusive deep-inelastic scattering

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  • 24 July 2003
Abstract
Double-spin asymmetries of semi-inclusive cross sections for the production of identified pions and kaons have been measured in deep-inelastic scattering of polarized positrons on a polarized deuterium target. Five helicity distributions including those for three sea quark flavors were extracted from these data together with re-analyzed previous data for identified pions from a hydrogen target. These distributions are consistent with zero for all three sea flavors. There is no evidence of either the negative polarization of the strange sea that appears in analyses of only inclusive data, or of a recently predicted flavor asymmetry in the polarization of the light quark sea.

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