| THE PHYSICS OF ELEMENTARY PARTICLES AND FIELDS |
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QCD Axial Anomaly Enhances the $\eta \eta^\prime$ Decay of the Hybrid Candidate $\eta_1(1855)$ |
| Hua-Xing Chen1*, Niu Su1*, and Shi-Lin Zhu2* |
1School of Physics, Southeast University, Nanjing 210094, China
2School of Physics and Center of High Energy Physics, Peking University, Beijing 100871, China
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| Cite this article: |
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Hua-Xing Chen, Niu Su, and Shi-Lin Zhu 2022 Chin. Phys. Lett. 39 051201 |
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Abstract We study the hybrid mesons with the exotic quantum number $I^{\rm G}J^{\rm PC} = 0^+1^{-+}$ and investigate their decays into the $\eta \eta^\prime$, $a_1(1260) \pi$, $f_1(1285) \eta$, $f_1(1420) \eta$, $K^*(892) \overline{K}$, $K_1(1270) \overline{K}$, and $K_1(1400) \overline{K}$ channels. It is found that the QCD axial anomaly enhances the decay width of the $\eta \eta^\prime$ channel although this mode is strongly suppressed by the small p-wave phase space. Our results support the interpretation of the $\eta_1(1855)$ recently observed by BESIII as the $\bar s s g$ hybrid meson of $I^{\rm G}J^{\rm PC}=0^+1^{-+}$. The QCD axial anomaly ensures the $\eta \eta^\prime$ decay mode to be a characteristic signal of the hybrid nature of the $\eta_1(1855)$.
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Received: 15 February 2022
Editors' Suggestion
Published: 29 April 2022
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| PACS: |
12.39.Mk
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(Glueball and nonstandard multi-quark/gluon states)
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11.40.-q
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(Currents and their properties)
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12.38.Lg
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(Other nonperturbative calculations)
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