Observation of an isoscalar resonance with exotic $J^{PC}=1^{-+}$ quantum numbers in $J/\psi \to \gamma \eta {\eta }^{\prime }$

Abstract

Using a sample of (10.09$\pm$0.04)$\times$10${}^9$ $J/\psi$ events collected with the BESIII detector operating at the BEPCII storage ring, a partial wave analysis of the decay $J/\psi \to \gamma \eta {\eta }^{\prime }$ is performed. The first observation of an isoscalar state with exotic quantum numbers $J^{PC}=1^{-+}$, denoted as ${\eta }_1(1855)$, is reported in the process $J/\psi \to \gamma {\eta }_1(1855)$ with ${\eta }_1(1855)\to \eta {\eta }^{\prime }$. Its mass and width are measured to be (1855$\pm$9${}_{-1}^{+6}$)MeV/$c^2$ and (188$\pm$18${}_{-8}^{+3}$)MeV, respectively, where the first uncertainties are statistical and the second are systematic, and its statistical significance is estimated to be larger than 19$\sigma$.

arXiv comment8 pages, 12 figures

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• Review of the low-lying excited baryons ${\Sigma }^{\ast }(1/2^{-})$
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• $1^{-+}$ Hybrid in $J/\psi$ Radiative Decays from Lattice QCD
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• Kinematical higher-twist corrections in ${\gamma }^{\ast }\to M_1{M}_2\gamma$: Neutral meson production
• Light double-gluon hybrid states with the exotic quantum numbers $J^{PC}=1^{-+}$ and $3^{-+}$
• Predictions of the hybrid mesons with exotic quantum numbers $J^{PC}=2^{+-}$
• Mixing angle of $K_1(1270/1400)$ and the $K{\bar{K}}_1(1400)$ molecular interpretation of ${\eta }_1(1855)$
• Faddeev fixed-center approximation to the $\eta K^{\ast }{\bar{K}}^{\ast }$, $\pi K^{\ast }{\bar{K}}^{\ast }$ and $K{K}^{\ast }{\bar{K}}^{\ast }$ systems
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• Double-gluon charmonium hybrid states with various (exotic) quantum numbers
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• Conventional mesons below 2 GeV
• Observation of Charmonium $h_c$ Radiative Decays to Multiple Light Hadrons and the Tensor State $f_2(1270)$
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• Strong Decays of the Light Exotic $0^{+-}$ and $2^{+-}$ Hybrid Mesons
• Amplitude Analysis of the Isospin-Violating Decay $J/\psi \to \gamma \eta {\pi }^0$
• High-energy ${\eta }^{(\prime )}\pi$ photoproduction and the nature of exotic waves
• Towards heavy double-gluon hybrid mesons with exotic quantum numbers in QCD sum rules