Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2012-03-06
Physics Letters B 709 (2012) 358--361
Physics
High Energy Physics
High Energy Physics - Phenomenology
8 pages, 5 figures
Scientific paper
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.
Caramés T. F.
Valcarce Aldo
Vijande Javier
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