One-loop factorization of the nucleon g(2)-structure function in the nonsinglet case - art. no. 094016

We consider the one-loop factorization of the simplest twist-3 process: inc lusive deep-inelastic scattering of longitudinally polarized leptons on a t ransversely polarized nucleon target. By studying the Compton amplitudes fo r certain quark and gluon states at one loop, we find the coefficient funct ions for the nonsinglet twist-3 distributions in the factorization formula of g(2)(x(B), Q(2)). The result marks the first step towards a next-to-lead ing order formalism for this transverse-spin-dependent structure function o f the nucleon.