Chiral symmetry and the charge asymmetry of the s(bar s) distribution in a proton.

摘要

Based on a simple K-cloud model, as well as the Gross-Neveu and the Nambu-Jona-Lasinio model, it is predicted that the s(bar s) sea in a proton is not charge symmetric at large Bjorken-x. The s quarks are shifted to larger values of x(sub bj) than the (ba ...