Abstract
The quark transversity distributions are discussed in a light-cone SU(6) quark-diquark model and in a perturbative QCD based analysis. The azimuthal spin asymmetries, both for charged and neutral pion production in semi-inclusive deep inelastic scattering of unpolarized charged lepton beams on longitudinally and transversely polarized nucleon targets, are analyzed. It is found that different approaches to the distribution and fragmentation functions may lead to quite different predictions. It is also found that the unfavored quark to pion fragmentation functions should be taken into account for π- production from a proton target.
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