Hadronic fluctuations and quark-antiquark asymmetry in the nucleon

Abstract

We derive the nucleon non-perturbative sea-quark distributions coming from a composite model involving quarks and hadronic degrees of freedom. The model predicts a definite structured quark-antiquark asymmetry in the nucleon sea.

4 pages, 2 fig.ps, uses sproc.sty. Presented in Quark Matter'97, Tsukuba (Japan) and in Hadron Physics'98, Florianopolis (Brazil). To appear in the Proceedings