Search for $\eta$ and ${\eta }^{\prime }$ Invisible Decays in $J/\psi \to \varphi \eta$ and $\varphi {\eta }^{\prime }$

Abstract

Using a sample of $(225.3\pm 2.8)\times 10^6$ $J/\psi$ decays collected with the BESIII detector at BEPCII, searches for invisible decays of $\eta$ and ${\eta }^{\prime }$ in $J/\psi \to \varphi \eta$ and $\varphi {\eta }^{\prime }$ are performed. Decays of $\varphi \to K^{+}{K}^{-}$ are used to tag the $\eta$ and ${\eta }^{\prime }$ decays. No signals above background are found for the invisible decays, and upper limits at the 90% confidence level are determined to be $2.58\times 10^{-4}$ for the ratio $\frac{\mathcal{B}(\eta \to \mathrm{invisible})}{\mathcal{B}(\eta \to \gamma \gamma )}$ and $2.39\times 10^{-2}$ for $\frac{\mathcal{B}({\eta }^{\prime }\to \mathrm{invisible})}{\mathcal{B}({\eta }^{\prime }\to \gamma \gamma )}$.

8 pages, 5 figures, and 2 tables, add more reference, changes made in introduction and conclusion Accepted by Phys. Rev. D; this the version for publication at PRD

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• Search for a massless dark photon in ${\Lambda }_c^{+}\to p{\gamma }^{\prime }$ decay
• An overview of $\eta$ and ${\eta }^{\prime }$ decays at BESIII
• Note on invisible decays of light mesons
• Search for $\psi (3686)\to \gamma {\eta }_c(\eta (1405))\to \gamma {\pi }^{+}{\pi }^{-}{\pi }^0$
• Strange Quarkonium States at BESIII
• Search for sub-GeV invisible particles in inclusive decays of $J/\psi$ to $\varphi$