  We show that quark orbital angular momentum is directly related to
off-forward correlation functions which include intrinsic transverse momentum
corresponding to a derivative with respect to the transverse coordinates. Its
possible contribution to scattering processes is therefore of higher twist and
vanishes in the forward limit. The relation of OAM to other twist 2 and 3
distributions known in the literature is derived and formalized by an
unintegrated sum rule.
