Recent Progress and Puzzles in Charmonium Physics

Abstract

While the charmonium model has been effective in describing ccbar bound mesons, there have been many recently discovered charmonium-like states it cannot accommodate. Here I provide a review of recent results from the B-factories including the X(3872), three new particles in the mass range near 3.93 GeV, and four new resonances in initial state radiation (ISR) decays.