Too many $X's$, $Y's$ and $Z's$?
arXiv:1203.1123 · doi:10.1016/j.physletb.2012.02.020
Abstract
A large number of new states have been reported during the last few years in charmonium spectroscopy above the charmed meson production threshold. They have been called $X's$, $Y's$, and $Z's$. We reflect on the influence of thresholds on heavy meson spectroscopy comparing different flavor sectors and quantum numbers. The validity of a quark-model picture above open-flavor thresholds would severely restrict the number of channels that may lodge meson-meson molecules.
8 pages, 5 figures