Polarised and Unpolarised Charmonium Production at Higher Orders in v

Abstract

We study the unpolarised and polarised hadro-production of charmonium in non-relativistic QCD (NRQCD) at low transverse momentum, including sufficiently higher orders in the relative velocity, $v$, so as to study the ratio of ${\chi }_{c1}$ and ${\chi }_{c2}$ production rates.

Comments: 4 pages, 1 Postscript figure, LaTeX, Presented at the QCD97 Euroconference, Montpellier, July 3-9, 1997, to appear in Nuclear Physics B Proceedings Supplement