Abstract
An attempt is made to understand the z-dependence of the azimuthal single spin asymmetries observed by the HERMES Collaboration in terms of chiral models based on effective quark and Goldstone boson degrees of freedom. The effects of respectively neglecting and considering Gaussian intrinsic parton transverse momenta and the Sivers effect are explored. Predictions for the transverse target polarization experiment at HERMES are presented.
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