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In this letter, we discuss the extension of Feynman's derivation of the equation of motion to the case of spinning particles. We show that a spinning particle interacts only with the electromagnetic and gravitational fields. In the absence of the electromagnetic interactions, we rederive Papapetrou's equations for spinning particles in the background of the conformal gravity. We also find that the effect of spin coupled to non-constant electromagnetic fields leads to further corrections to the Lorentz force equations. Some discussions of these results are given at the end., 16pages, RU93-10-B

We study QCD radiative corrections to the nucleon's transverse spin-dependent structure function {ital g}{sub 2}({ital x},{ital Q}{sup 2}) in the leading-logarithmic order for large {ital Q}{sup 2}. The anomalous-dimension matrix for the nonsinglet twist-3 operators appearing in the operator-product expansion for {ital g}{sub 2}({ital x},{ital Q}{sup 2}) is calculated and the experimental implications are discussed.