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*
1 School of Physics, Southeast University, Nanjing 210094, China2 School of Physics and Center of High Energy Physics, Peking University, Beijing 100871, China
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 $\eta_1(1855)$.
收稿日期: 2022-02-15
Editors' Suggestion
出版日期: 2022-04-29
:
12.39.Mk
(Glueball and nonstandard multi-quark/gluon states)
11.40.-q
(Currents and their properties)
12.38.Lg
(Other nonperturbative calculations)
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2022, Vol. 39 
