Spin structure function g2(x, Q2) and twist-3 operators in QCD

We investigate the spin structure function g2(x, Q2) in the framework of the operator product expansion and the renormalization group. The twist-3 operators appearing in QCD are examined and their relations are studied. It is noted that operators proportional to equation of motion appear in the operator mixing through renormalization, which can be studied from the relevant Greenʹs functions. We also note that the coefficient functions can be properly fixed after the choice of independent operators.