Polarized deep inelastic diffractiveepscattering: Operator approach

Polarized inclusive deep-inelastic diffractive scattering is dealt with in a quantum field theoretic approach. The process can be described in the general framework of nonforward scattering processes using the light-cone expansion in the generalized Bjorken region applying the generalized optical theorem. The diffractive structure functions $g_1^{D\left(3\right)\mathrm{}}$ and $g_2^{D\left(3\right)\mathrm{}}$ are calculated in the twist-2 approximation and are expressed by diffractive parton distributions, which are derived from pseudoscalar two-variable operator expectation values. In this approximation the structure function $g_2^{D\left(3\right)\mathrm{}}$ is obtained from $g_1^{D\left(3\right)\mathrm{}}$ by a Wandzura-Wilczek relation similar as for deep inelastic scattering. The evolution equations are given. We also comment on the higher twist contributions in the light-cone expansion.