Determination of flavor asymmetry for ${\Sigma }^{\pm }$ by the Drell-Yan process

Abstract

Flavor asymmetries for the valence and sea quarks of the ${\Sigma }^{\pm }$ 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 ${\Sigma }^{+}$, $\bar{u}/\bar{d}\le 1/2$, whereas the former predict $\bar{u}/\bar{d}\approx 4/3$. Estimates of valence quark asymmetries based on quark models also show large deviations from SU(3) predictions, which should be measurable.

Comments: 15 pages, latex. Figures available from alberg@phys.washington.edu. To be published in Phys. Lett. B