Search for the rare decay ${\eta }^{\prime }\to {\pi }^0{\pi }^0{\pi }^0{\pi }^0$ at BESIII

Abstract

Based on a sample of 1.31 billion $J/\psi$ events collected with the BESIII detector, we perform a search for the rare decay ${\eta }^{\prime }\to 4{\pi }^0$ via $J/\psi \to \gamma {\eta }^{\prime }$. No significant ${\eta }^{\prime }$ signal is observed in the invariant mass spectrum of 4${\pi }^0$. With a Bayesian approach, the upper limit on the branching fraction of ${\eta }^{\prime }\to 4{\pi }^0$ is determined to be $\mathcal{B}({\eta }^{\prime }\to 4{\pi }^0)$ $<4.94\times 10^{-5}$ at the 90\% confidence level, which is a factor of six smaller than the previous experimental limit.

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Cited by in corpus (2)

• Improved measurement of the decays ${\eta }^{\prime }\to {\pi }^{+}{\pi }^{-}{\pi }^{+(0)}{\pi }^{-(0)}$ and search for the rare decay ${\eta }^{\prime }\to 4{\pi }^0$
• Study of $f_1(1420)$ and $\eta (1405)$ in the decay $J/\psi \to \gamma {\pi }^0{\pi }^0{\pi }^0$