Bag model predictions for polarized structure functions and theirQ 2-evolutions

It is shown that modified versions of the MIT bag model can fairly describe non-singlet pieces of experimentally known structure functions if theQ²-evolution equations are trusted down to the model scale. Further on we utilize these models to study the presently unmeasured transversely polarized structure functionsg₂ andh₁. Using recently developed approximate evolution equations we focus on the relevance of the twist-3 contribution tog₂. Finally, a simple first guess-model for the transversity distributionh₁ is presented.