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arXiv · 2203.06934

Analysis of the $η_1(1855)$ as a $K\bar{K}_1(1400)$ molecular state

Feng Yang·Hong Qiang Zhu·Yin Huang
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Abstract

In this work, we study the radiative and strong decay of $S$-wave $K\bar{K}_1(1400)$ molecular state within the effective Lagrangians approach and find the relation between the $K\bar{K}_1(1400)$ molecular state and the newly observed $η_1(1855)$ state by comparing with the BESIII observation. The prediction indicates that the decay width can reach up to $182.97^{+2.79}_{-3.50}$ MeV, which can be confronted with the experimental data. If the $η_1(1855)$ could be $S$-wave $K\bar{K}_1(1400)$ molecular state, the $K\bar{K}^{*}π$ three-body decay provides the dominant contribution, not the $ηη^{'}$ channel found in the experiment. In addition, the partial width for $η_1(1855)\toγϕ$ can reach up to $17.95^{+0.21}_{-0.43}$ KeV. Those results can be measured in future experiments and used to test the nature of the $η_1(1855)$.

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Feng Yang, Hong Qiang Zhu, Yin Huang. 2022-11-14. Analysis of the $η_1(1855)$ as a $K\bar{K}_1(1400)$ molecular state. https://doi.org/10.1016/j.nuclphysa.2022.122571

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