Υ\Upsilon Polarization at HERA-BB

The production of $\Upsilon$ mesons in fixed target $pN$ collisions is considered. It is shown that Non-Relativistic QCD predicts $\Upsilon$ states to be produced with sizeable transverse polarization. The possibility of a measurement of the $\Upsilon$ polarization at the HERA-$B$ experiment is discussed.Comment: 9 pages, LaTeX, with 3 eps figs included with epsfig.st

Bottomonium Polarization in Hadroproduction

The polarization of the $\Upsilon$ and $\chi_{b2}$ mesons in hadron collisions is considered. It is shown that both states are produced with a noticeable polarization which allows to use forthcoming data of DESY HERA-B and of the RHIC collider experiments to discriminate between the different mechanisms of heavy quarkonia production

Target Mass Corrections to the Spin-dependent Structure Functions

The target mass corrections to the twist-2 contributions of the spin-dependent structure functions are calculated using operator product expansion in lowest order in QCD. The influence of such corrections to the different relations between the structure functions is considered.Comment: 2 pages LATEX, contract number adde