Determination of flavor asymmetry for Σ± by the Drell-Yan process

Flavor asymmetries for the valence and sea quarks of the Σ± can be obtained from Drell-Yan experiments using charged hyperon beams on proton and deuteron targets. A large, measurable difference in sea quark asymmetries is predicted between SU(3) and pseudoscalar meson models. The latter predict that in Σ+, ud ≤ 12, whereas the former predict ud ≈ 43. Estimates of valence quark asymmetries based on quark models also show large deviations from SU(3) predictions, which should be measurable.