Nuclear quark and gluon distributions in coordinate space

In coordinate space, quark and gluon distributions of the nucleon are defin ed as correlation functions involving two field operators separated by a li ght-cone distance y(+) = 2l. We study. the nuclear modifications of these d istributions. The largest effect is a strong depletion of parton distributi ons (shadowing) at large longitudinal distances, which starts for all parto n species at l = 2 fm, i.e. at the average nucleon-nucleon separation in nu clei. On the other hand, the nuclear radius does not play a significant rol e. At l less than or similar to 1 fm, nuclear modifications of parton distr ibutions are small. The intrinsic structure of individual nucleons is evide ntly not very much affected by nuclear binding. In particular, there is no evidence for a significant increase of the quark or gluon correlation lengt h in bound nucleons.