Observation and study of the decay $J/\psi \to \varphi \eta {\eta }^{\prime }$

Abstract

We report the observation and study of the decay $J/\psi \to \varphi \eta {\eta }^{\prime }$ using $1.3\times 10^9$ $J/\psi$ events collected with the BESIII detector. Its branching fraction, including all possible intermediate states, is measured to be $(2.32\pm 0.06\pm 0.16)\times 10^{-4}$. We also report evidence for a structure, denoted as $X$, in the $\varphi {\eta }^{\prime }$ mass spectrum in the $2.0-2.1$ GeV/$c^2$ region. Using two decay modes of the ${\eta }^{\prime }$ meson ($\gamma {\pi }^{+}{\pi }^{-}$ and $\eta {\pi }^{+}{\pi }^{-}$), a simultaneous fit to the $\varphi {\eta }^{\prime }$ mass spectra is performed. Assuming the quantum numbers of the $X$ to be $J^P=1^{-}$, its significance is found to be 4.4$\sigma$, with a mass and width of $(2002.1\pm 27.5\pm 21.4)$ MeV/$c^2$ and $(129\pm 17\pm 9)$ MeV, respectively, and a product branching fraction $\mathcal{B}(J/\psi \to \eta X)\times \mathcal{B}(X\to \varphi {\eta }^{\prime })=(9.8\pm 1.2\pm 1.7)\times 10^{-5}$. Alternatively, assuming $J^P=1^{+}$, the significance is 3.8$\sigma$, with a mass and width of $(2062.8\pm 13.1\pm 7.2)$ MeV/$c^2$ and $(177\pm 36\pm 35)$ MeV, respectively, and a product branching fraction $\mathcal{B}(J/\psi \to \eta X)\times \mathcal{B}(X\to \varphi {\eta }^{\prime })=(9.6\pm 1.4\pm 2.0)\times 10^{-5}$. The angular distribution of $J/\psi \to \eta X$ is studied and the two $J^P$ assumptions of the $X$ cannot be clearly distinguished due to the limited statistics. In all measurements the first uncertainties are statistical and the second systematic.

arXiv comment10 pages, 6 figures and 4 tables

References in corpus (21)

• Design and Construction of the BESIII Detector
• The Precision Monte Carlo Event Generator KK For Two-Fermion Final States In e+e- Collisions
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Cited by in corpus (16)

• Pentaquark and Tetraquark states
• Analysis of the $X_0(2900)$ as the scalar tetraquark state via the QCD sum rules
• Observation of a structure in $e^{+}{e}^{-}\to \varphi {\eta }^{\prime }$ at $\sqrt{s}$ from 2.05 to 3.08 GeV
• Fully-strange tetraquark $ss\bar{s}\bar{s}$ spectrum and possible experimental evidence
• Mass spectrum and strong decays of strangeonium in a constituent quark model
• $S$- and $P$-wave fully-strange tetraquark states from QCD sum rules
• Nature of the vector resonance $Y(2175)$
• Kaon and strangeonium spectrum in Regge phenomenology
• Study of the $\omega$ meson family and newly observed $\omega$-like state $X(2240)$
• Studying $X(2100)$ hadronic decays and predicting its pion and kaon induced productions
• Fully strange tetraquark resonant states as the cousins of $X(6900)$
• Light axial-vector and vector resonances $X(2100)$ and $X(2239)$
• Light tetraquark state candidates
• The new states $X(1910)$ and $X(2300)$ and higher light excited $J^{PC}=1^{+-}$ mesons
• Hints of the $J^{PC}=0^{--}$ and $1^{--}$ $K^{\ast }{\bar{K}}_1(1270)$ Molecules in the $J/\psi \to \varphi \eta {\eta }^{\prime }$ Decay
• Strangeonium spectrum with the screening effects and interpretation of $h_1(1911)$ and $X(2300)$ observed by BESIII