The Exotic XYZ Charmonium-like Mesons

Abstract

Charmonium, the spectroscopy of c\bar{c} mesons, has recently enjoyed a renaissance with the discovery of several missing states and a number of unexpected charmonium-like resonances. The discovery of these new states has been made possible by the extremely large data samples made available by the B-factories at the Stanford Linear Accelerator Center and at KEK in Japan, and at the CESR e^+e^- collider at Cornell. Conventional c\bar{c} states are well described by quark potential models. However, many of these newly discovered charmonium-like mesons do not seem to fit into the conventional c\bar{c} spectrum. There is growing evidence that at least some of these new states are exotic, i.e. new forms of hadronic matter such as mesonic-molecules, tetraquarks, and/or hybrid mesons. In this review we describe expectations for the properties of conventional charmonium states and the predictions for molecules, tetraquarks and hybrids and the various processes that can be used to produce them. We examine the evidence for the new candidate exotic mesons, possible explanations, and experimental measurements that might shed further light on the nature these states.

28 pages, 7 figures. Review for Ann Rev Nucl & Part Sci

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• Weak decays of heavy hadrons into dynamically generated resonances
• ${\Lambda }_{c}N$ bound states revisited
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• Evidence for a new resonance and search for the Y(4140) in $\gamma \gamma \to \varphi J/\psi$
• Interpretation of the X(3872) as a charmonium state plus an extra component due to the coupling to the meson-meson continuum
• Reanalysis of the $Y(3940)$, $Y(4140)$, $Z_c(4020)$, $Z_c(4025)$ and $Z_b(10650)$ as molecular states with QCD sum rules
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• Coupled-Channel and Screening Effects in Charmonium Spectrum
• QCD Sum Rules Approach to the $X,Y$ and $Z$ States
• Efimov States in Nuclear and Particle Physics
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• Higher mass bottomonia
• $B$ and $B_s$ Meson Spectroscopy
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• Estimating the Production Rate of Loosely-bound Hadronic Molecules using Event Generators
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• XYZ-like Spectra from Laplace Sum Rule at N2LO in the Chiral Limit
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• Radiative transitions of heavy quarkonium states
• On the scattering of D and D* mesons off the X(3872)
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