Search for invisible decays of $\omega$ and $\varphi$ with $J/\psi$ data at BESIII

Abstract

Using a data sample of $(1310.6\pm 7.0)\times 10^6$ $J/\psi$ events collected with the BESIII detector operating at the BEPCII collider, we perform the first experimental search for invisible decays of a light vector meson ($V=\omega ,\varphi$) via $J/\psi \to V\eta$ decays. The decay of $\eta \to {\pi }^{+}{\pi }^{-}{\pi }^0$ is utilized to tag the $V$ meson decaying into the invisible final state. No evidence for a significant invisible signal is observed, and the upper limits on the ratio of branching fractions at the 90\% confidence level are determined to be $\frac{\mathcal{B}(\omega \to \mathrm{invisible})}{\mathcal{B}(\omega \to {\pi }^{+}{\pi }^{-}{\pi }^0)}<8.1\times 10^{-5}$ and $\frac{\mathcal{B}(\varphi \to \mathrm{invisible})}{\mathcal{B}(\varphi \to K^{+}{K}^{-})}<3.4\times 10^{-4}$. By using the world average values of $\mathcal{B}(\omega \to {\pi }^{+}{\pi }^{-}{\pi }^0)$ and $\mathcal{B}(\varphi \to K^{+}{K}^{-})$, the upper limits on the decay branching fractions at the $90\%$ confidence level are set as $\mathcal{B}(\omega \to \mathrm{invisible})<7.3\times 10^{-5}$ and $\mathcal{B}(\varphi \to \mathrm{invisible})<1.7\times 10^{-4}$, respectively.

10 pages, 6 figures

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• Note on invisible decays of light mesons
• First measurement of polarizations in the decay $D^0\to \omega \varphi$
• Measurement of Singly Cabibbo-Suppressed Decays $D\to \omega \pi \pi$