A mechanism for the<i>T</i>-odd pion fragmentation function

We consider a simple rescattering mechanism to calculate a leading twist T-odd pion fragmentation function, a favored candidate for filtering the transversity properties of the nucleon. We evaluate the single spin azimuthal asymmetry for a transversely polarized target in semi-inclusive deep inelastic scattering (for HERMES kinematics). Additionally, we calculate the double T-odd $\mathrm{cos}2\ensuremath{\varphi}$ asymmetry in this framework.