Comment on the X(3915) nonstandard hadron candidate

Abstract

I review the experimental evidence for the $X(3915)$, the candidate nonstandard meson associated with $\omega J\psi$ resonance-like peaks in $B\to K\omega J\psi$ and $\gamma \gamma \to \omega J\psi$ near $M(\omega J\psi )=3920$~MeV, and address the conjecture that it can be identified as the ${\chi }_{c2}^{\prime }$, the radial excitation of the ${\chi }_{c2}$ charmonium state. Since the partial decay width for $B\to KX(3915)$ is at least an order-of-magnitude larger than that for $B\to K{\chi }_{c2}$, its assignment as the ${\chi }_{c2}^{\prime }$ is dubious.

arXiv comment6 page, 5 figures, to appear in the proceedings of "e+e- Collisions From Phi to Psi 2019," Novosibirsk, February 2019

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• Big-Bang Nucleosynthesis
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• Non-Standard Heavy Mesons and Baryons, an Experimental Review
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• Observation of a charmonium-like enhancement in the gamma gamma --> omega J/psi process
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• Search for B decays to final states with the eta_c meson
• The XYZ mesons: what they aren't

Cited by in corpus (3)

• Spectrum of the Hidden-Bottom and the Hidden-Charm/Strange Exotics in the Dynamical Diquark Model
• The Dynamical Diquark Model: Fine Structure and Isospin
• Understanding the $0^{++}$ and $2^{++}$ charmonium(-like) states near 3.9 GeV