4-QUARK AND 6-QUARK COMPONENTS IN THE PION LIGHT-FRONT WAVE-FUNCTION AND NONPERTURBATIVE SEA IN THE PION

We discuss possible effects of ''meson-meson'' and ''baryon-antibaryon '' Fock components to the pseudoscalar meson Light-front wave function s. We include pseudoscalar-vector, pseudoscalar-scalar, vector-vector and vector-axial meson-meson components and octet-octet, octet-decuple t and decuplet-decuplet baryon-antibaryon components. We find that onl y a few principal Fock components play an important role in the expans ion. We estimate the probability of the four-quark components to be 10 -26% and the probability of the six-quark components to be less than 0 .3%. The presence of such Fock components leads to an extra non-pertur bative sea in the pion. As a consequence, the sea quark distributions are larger than from the models with two valence quarks at the initial Q(2) scale. In analogy to the nucleon case, we find a suppression of the strange sea in the pion with respect to the light (u, d) quarks. T his suppression factor exhibits a Bjorken-x dependence.