${\psi }^{\prime }$ productions as a test of color-octet mechanism

Abstract

To test the color-octet model of heavy quarkonium productions, we propose ${\psi }^{\prime }$-productions at small-$p_T$ regions in polarized $pp$ collisions for the forthcoming RHIC polarized experiments, whose experimental test at $\sqrt{s}=50$ GeV might be very promising.

Comments: 9 pages + 3 Postscript figures, Latex