Search for invisible decays of ω and ϕ with J/ψ data at BESIII

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Abstract

Using a data sample of $(1310.6\ifmmode\pm\else\textpm\fi{}7.0)\ifmmode\times\else\texttimes\fi{}{10}^{6}\text{ }\text{ }J/\ensuremath{\psi}$ 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 ($V=\ensuremath{\omega}$, $\ensuremath{\phi}$) via $J/\ensuremath{\psi}\ensuremath{\rightarrow}V\ensuremath{\eta}$ decays. The decay of $\ensuremath{\eta}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\pi}}^{0}$ 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 $\frac{\mathcal{B}(\ensuremath{\omega}\ensuremath{\rightarrow}\text{invisible})}{\mathcal{B}(\ensuremath{\omega}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\pi}}^{0})}<8.1\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}5}$ and $\frac{\mathcal{B}(\ensuremath{\phi}\ensuremath{\rightarrow}\text{invisible})}{\mathcal{B}(\ensuremath{\phi}\ensuremath{\rightarrow}{K}^{+}{K}^{\ensuremath{-}})}<3.4\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}4}$. By using the world average values of $\mathcal{B}(\ensuremath{\omega}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\pi}}^{0})$ and $\mathcal{B}(\ensuremath{\phi}\ensuremath{\rightarrow}{K}^{+}{K}^{\ensuremath{-}})$, the upper limits on the decay branching fractions at the 90% confidence level are set as $\mathcal{B}(\ensuremath{\omega}\ensuremath{\rightarrow}\text{invisible})<7.3\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}5}$ and $\mathcal{B}(\ensuremath{\phi}\ensuremath{\rightarrow}\text{invisible})<1.7\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}4}$, respectively.

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