Effects of the large gluon polarization on $xg_1^d(x)$ and J/$ψ$ productions at polarized ep and pp collisions

Abstract

The recent SMC data of $xg_1^d(x)$ are reproduced with the large polarized gluons. To study further the polarized gluon distribution in a proton, we calculate the spin--dependent differential cross section for J/$ψ$ leptoproductions and the two--spin asymmetry for J/$ψ$ hadroproductions. Its experimental implication is discussed.