QCD Quark Distributions in Mesons.

The valence-quark distributions in the π meson and in transversely and longitudinally polarized p mesons in the region of intermediate x are obtained on the basis of generalized QCD sum rules. Powerlaw corrections up to d = 6 are taken into account. The quark distributions in the pion agree with those found from the data on Drell-Yan processes. A comparison of the results for the π and ρ mesons show that polarization effects are very significant and that the distribution functions do not have SU(6) symmetry. [ABSTRACT FROM AUTHOR]