Bryan Fulsom (University of British Columbia)
"New Puzzles and Discoveries in Quarkonium Physics"

While the charmonium model has been effective in describing ccbar mesons
below 3.7 GeV/c2, there have been many recently discovered
charmonium-like states above the DDbar threshold it cannot accommodate.
The X(3872), several new resonances in initial state radiation, and the
charged four-quark Z+(4430) state are but a few of the latest findings
challenging our understanding of the strong force. I will provide a review
of the expectations from the charmonium model and present results from the
B-factories, BaBar and Belle. These exciting discoveries may be the first
signs of an exotic new spectroscopy including tetraquarks, ccg hybrids,
and four-quark molecules.