Too many $X's$, $Y's$ and $Z's$?

Details Too many $X's$, $Y's$ and $Z's$? Too many $X's$, $Y's$ and $Z's$?

2012-03-06

arxiv.org/abs/1203.1123v1

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.

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