Gluon versus sea quark shadowing

We calculate the shadowing of sea quarks and gluons and show that the shado wing of gluons is not simply given by the sea quark shadowing, especially a t small x. The calculations are done in the lab frame approach by using the generalized vector meson dominance model. Here the virtual photon turns in to a hadronic fluctuation long before the nucleus. The subsequent coherent interaction with more than one nucleon in the nucleus leads to the depletio n sigma(gamma*A) < A sigma(gamma*N) known as shadowing. A comparison of the shadowing of quarks to E665 data for Ca-40 and Pb-207 shows good agreement . (C) 1999 Published by Elsevier Science B.V. All rights reserved.