Quarkonium Production At $Z^0$ and in ${\rm Y}(1S)$ Decay

Abstract

The conventional color-singlet model was challenged by the recent data on quarkonium production. Discrepancies in production rates were observed at the Tevatron, at LEP, and in fixed-target experiments. The newly advocated color-octet mechanism provides a plausible solution to the anomalous quarkonium production observed at the Tevatron. The color-octet mechanism should also affect other quarkonium production channels. In this paper we will summarize the studies of quarkonium production in $Z^0$ and ${\rm Y}$ decays.

arXiv comment10 pages and three figures embedded using epsf.tex. Talk given at the UIC Quarkonium Workshop, Chicago IL, June 13-15 1996