Heavy quarkonia

Abstract

Two complementary approaches to the theory of heavy quarkonia are discussed. The nonrelativistic potential models give amazingly accurate predictions, but lack a theoretical justification. The expansion in powers of $v/c$ is theoretically very acceptable, but is not as good in giving numerical predictions. The importance of combining these two approaches is stressed.

Comments: Presented at QCD'96 Montpellier 4-12 June 1996 7 pages, no figures, Latex file