Determination of light-flavor asymmetry in the $\Sigma^{\pm}$ sea by the   Drell-Yan process
  We propose a flavor asymmetry in the light quark sea of $\Sigma^{\pm}$, which can be measured in Drell-Yan experiments using charged hyperon beams on proton and deuteron targets. Such a measurement would help to reinforce the presence of pseudoscalar mesons in a quark model of baryons. 
Mary Alberg and Ernest M. Henley