SPIN STRUCTURE-FUNCTION G(2)(X,Q(2)) AND TWIST-3 OPERATORS IN QCD

We investigate the spin structure function g(2)(x, Q(2)) in the framew ork of the operator product expansion and the renormalization group. T he twist-3 operators appearing in QCD are examined and their relations are studied. It is noted that operators proportional to equation of m otion appear in the operator mixing through renormalization, which can be studied from the relevant Green's functions. We also note that the coefficient functions can be properly fixed after the choice of indep endent operators.