More hidden heavy quarkonium molecules and their discovery decay modes

Abstract

To validate the molecular description of the observed $Z_b(10610)/Z_b(10650)$ and $Z_c(3900)/Z_c(4025)$, it is valuable to investigate their counterparts, denoted as $Z_{QV}^{(\prime )}$ in this work, and the corresponding decay modes. In this work, we present an analysis of the $Z_{QV}^{(\prime )}$ using flavor symmetry. We also use the effective Lagrangian based on the heavy quark symmetry to explore the rescattering mechanism and calculate the partial widths for the isospin conserved channels $Z_{QV}^{(\prime )}\to {\eta }_{Q}V$. The predicted partial widths are of an order of MeV for $Z_{QV}\to {\eta }_{Q}V$, which correspond to branching ratios of the order of $10^{-2}\sim 10^{-1}$. For $Z_{QV}^{\prime }\to {\eta }_{Q}V$, the partial widths are a few hundreds of keV and the branching ratios are about $10^{-3}$. Future experimental measurements can test our predictions on the partial widths and thus examine the molecule description of heavy quarkoniumlike exotic states.

arXiv comment11 pages, 2 figures; accepted by Phys. Rev. D

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• Understanding the ${\eta }_c\rho$ decay mode of $Z_c^{(\prime )}$ via the triangle loop mechanism
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• Possible hadronic molecular states composed of $S$-wave heavy-light mesons
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