Abstract
Using perturbative QCD on the light cone (A/sub +/ = 0 gauge), and the Brodsky-Lepage collinear projection, we make a partial-wave projection (in the l/sub z/ component) of the Weinberg equation, and find a set of evolution equations for distribution amplitudes. For l/sub z/not =0 our equations are inhomogeneous, and their solutions show an increasing QCD perturbative effect for the currently available momentum transfers. The driving force of the inhomogenous evolution equations is a three-quark irreducible interaction, which gives terms approx.(1-x)/sup 3/ in the proton's deep-inelastic structure function, breaks the SU(6) symmetry, and contributes to the deviation of the d/u ratio for proton from the value 1/2. That force couples a qq-bar pair to one transverse gluon and one Coulomb gluon.
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