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

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

2003-07-24

arxiv.org/abs/hep-ex/0307064v2

Phys.Rev.Lett.92:012005,2004

Physics

High Energy Physics

High Energy Physics - Experiment

5 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.92.012005

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. A recently predicted flavor asymmetry in the polarization of the light quark sea appears to be disfavored by the data.

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