Observation of $h_1(1380)$ in the $J/\psi \to {\eta }^{\prime }K\bar{K}\pi$ Decay

Abstract

Using $1.31\times 10^9$ $J/\psi$ events collected by the BESIII detector at the BEPCII $e^{+}{e}^{-}$ collider, we report the first observation of the $h_1(1380)$ in $J/\psi \to {\eta }^{\prime }{h}_1(1380)$ with a significance of more than ten standard deviations. The mass and width of the possible axial-vector strangeonium candidate $h_1(1380)$ are measured to be $M = (1423.2 \pm 2.1 \pm 7.3)\mevcc$ and $Γ= (90.3 \pm 9.8 \pm 17.5)\mev$. The product branching fractions, assuming no interference, are determined to be $\mathcal{B}(J/\psi \to {\eta }^{\prime }{h}_1(1380))\times \mathcal{B}(h_1(1380)\to K^{\ast }(892{)}^{+}{K}^{-}+c.c.)=(1.51\pm 0.09\pm 0.21)\times 10^{-4}$ in ${\eta }^{\prime }{K}^{+}{K}^{-}{\pi }^0$ mode and $\mathcal{B}(J/\psi \to {\eta }^{\prime }{h}_1(1380))\times \mathcal{B}(h_1(1380)\to K^{\ast }(892)\bar{K}+c.c.)=(2.16\pm 0.12\pm 0.29)\times 10^{-4}$ in ${\eta }^{\prime }{K}_S^0{K}^{\pm }{\pi }^{\mp }$ mode. The first uncertainties are statistical and the second are systematic. Isospin symmetry violation is observed in the decays $h_1(1380)\to K^{\ast }(892{)}^{+}{K}^{-}+c.c.$ and $h_1(1380)\to K^{\ast }(892{)}^0{\bar{K}}^0+c.c.$. Based on the measured $h_1(1380)$ mass, the mixing angle between the states $h_1(1170)$ and $h_1(1380)$ is determined to be $(35.9\pm 2.6{)}^{\circ }$, consistent with theoretical expectations.

References in corpus (19)

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Cited by in corpus (18)

• Mass spectrum and strong decays of strangeonium in a constituent quark model
• The phenomenology of the exotic hybrid nonet with ${\pi }_1(1600)$ and ${\eta }_1(1855)$
• Kaon and strangeonium spectrum in Regge phenomenology
• Triangle singularities in $J/\psi \to \eta {\pi }^0\varphi$ and ${\pi }^0{\pi }^0\varphi$
• Studying $X(2100)$ hadronic decays and predicting its pion and kaon induced productions
• Comprehensive study of light axial vector mesons with the presence of triangle singularity
• Theoretical description of the $\mathbf{J}/\mathbf{\psi }\to \mathbf{\eta }({\mathbf{\eta }}^{\prime }){\mathbf{h}}_1(1380)$, $\mathbf{J}/\mathbf{\psi }\to \mathbf{\eta }({\mathbf{\eta }}^{\prime }){\mathbf{h}}_1(1170)$ and $\mathbf{J}/\mathbf{\psi }\to {\mathbf{\pi }}^0{\mathbf{b}}_1(1235{)}^0$ reactions
• The ${\chi }_{cJ}$ decay to $\varphi K^{\ast }\bar{K},\varphi h_1(1380)$ testing the nature of axial vector meson resonances
• Anomalous interactions between mesons with nonzero spin and glueballs
• $J/\psi$ decay into $\varphi (\omega )$ and vector-vector molecular states
• Ordinary and exotic mesons in the extended Linear Sigma Model
• ${\chi }_{c1}$ decays into a pseudoscalar meson and a vector-vector molecule
• $J/\psi \to \gamma \pi \pi$, $\gamma {\pi }^0\eta$ reactions and the $f_0(980)$ and $a_0(980)$ resonances
• Constraints imposed by the partial wave amplitudes on the decays of $J=1,2$ mesons
• Studying triangle singularity through spin observables
• The new states $X(1910)$ and $X(2300)$ and higher light excited $J^{PC}=1^{+-}$ mesons
• Strangeonium spectrum with the screening effects and interpretation of $h_1(1911)$ and $X(2300)$ observed by BESIII
• Mass prediction for the last discovered member of the axial-vector nonet with quantum numbers J${}^{PC}=1^{+-}$