The flavour asymmetry and quark-antiquark asymmetry in the $\Sigma^+$-sea

Abstract

The sea quark content of the $\Sigma^+$ baryon is investigated using light-cone baryon-meson fluctuation model suggested by Brodsky and Ma. It is found that the $\Sigma^+$ sea is flavour asymmetric (\dbar > \ubar > \sbar) and quark-antiquark asymmetric (q \not= \qbar). Our prediction for the flavour asymmetry, \dbar > \ubar > \sbar, is significantly different from the SU(3) prediction (\dbar < \ubar < \sbar), while our prediction for the $d$-\dbar asymmetry is consistent with the SU(3) prediction.Comment: RevTex, 12 pages, 4 Postscript figures. The effects from the input parton distribution evolution are discussed. Conclusions remain. Version to appear in Phys. Lett.