Spin effects in vector meson and $Q\bar{Q}$ production

Abstract

We study light hadron leptoproduction at small $x$. Vector meson production is analysed in terms of generalized gluon distributions with taking into account the transverse quark motion. Within a two-gluon model the double spin asymmetries for longitudinally polarized leptons and transversely polarized protons in the diffractive $Q\bar{Q}$ production are investigated. The predicted $A_{lT}$ asymmetry is large and can be used to obtain information on the polarized gluon distributions in the proton.

8 pages, latex, 2 figures, presented at the Conference "Symmetries and Spin" - Praha-SPIN-2003, Prague, July 12 - July 19, 2003