Diffractive hadron leptoproduction and SPD

We discuss diffractive hadron leptoproduction in terms of skewed gluon distributions and within two-gluon exchange model. Connection of the two-gluon approach with skewed gluon distributions is found. The double spin asymmetries for longitudinally polarized leptons and transversely polarized protons in diffractive vector meson and QQ(bar) production at high energies within the two-gluon model is analysed. The asymmetry predicted for meson production is found to be quite small. The AlT asymmetry for QQ(bar) production is large and can be used to obtain information on the polarized skewed gluon distributions in the proton. (author)