TWO--SPIN ASYMMETRY OF HEAVY QUARKONIA PRODUCTIONS AT RHIC ENERGY

Hadroproductions of charmonium and bottomonium ${\chi }_J$ in polarized $pp$ collisions at RHIC energies are studied. Two–spin asymmetries $A_{LL}^{{\chi }_J}(pp)$ for these reactions are very good parameters for examining the polarized gluon distributions in a proton.