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arXiv · 1810.08146

$Z_c(4100)$ and $Z_c(4200)$ as hadrocharmonium

M. B. Voloshin
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Abstract

It is suggested that the recently reported charged charmoniumlike resonance $Z_c(4100)$ and the previously observed $Z_c(4200)$ are two states of hadrocharmonium, related by the charm quark spin symmetry in the same way as the lowest charmonium states $η_c$ and $J/ψ$. Namely, the $Z_c(4100)$ is (dominantly) the $η_c$ embedded in an light-quark excitation with quantum numbers of a pion, while the $Z_c(4200)$ is a similar four quark state containing $J/ψ$ instead of $η_c$. It is argued that this picture suggests certain relations between the properties of the two exotic resonances and a distinctive pattern of their decays that can be tested experimentally. It is also pointed out that due to the presence of a spatially compact $c \bar c$ charmonium the discussed exotic $Z_c$ states may be produced as resonances in the $s$ channel in $\bar p p$ annihilation.

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M. B. Voloshin. 2018-10-18. $Z_c(4100)$ and $Z_c(4200)$ as hadrocharmonium. https://doi.org/10.1103/physrevd.98.094028

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