Search for $\eta$ and ${\eta }^{\prime }\to {\pi }^{+}{e}^{-}{\bar{\nu }}_e+c.c.$ decays in $\jpsi \to ϕη$ and $\varphi {\eta }^{\prime }$

Abstract

Using a sample of 225.3 million $\jpsi$ events collected with the BESIII detector at the BEPCII $e^{+}{e}^{-}$ collider in 2009, searches for the decays of $\eta$ and ${\eta }^{\prime }\to {\pi }^{+}{e}^{-}{\bar{\nu }}_e+c.c.$ in $\jpsi \to ϕη$ and $\varphi {\eta }^{\prime }$ are performed. The $\varphi$ signals, which are reconstructed in $K^{+}{K}^{-}$ final states, are used to tag $\eta$ and ${\eta }^{\prime }$ semileptonic decays. No signals are observed for either $\eta$ or ${\eta }^{\prime }$, and upper limits at the 90% confidence level are determined to be $7.3\times 10^{-4}$ and $5.0\times 10^{-4}$ for the ratios $\frac{{\mathcal B}(η\to π^+ e^- \barν_e +c.c.)}{{\mathcal B}(η\to \pip\pim\piz)}$ and $\frac{{\mathcal B}(η^\prime\to π^+ e^-\barν_e +c.c.)}{{\mathcal B}(η^\prime \to \pip\pimη)}$, respectively. These are the first upper limit values determined for $\eta$ and ${\eta }^{\prime }$ semileptonic weak decays.

arXiv comment8 pages, 4 figures; version accpeted for publication at PRD

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• Search for $\psi (3686)\to \gamma {\eta }_c(\eta (1405))\to \gamma {\pi }^{+}{\pi }^{-}{\pi }^0$
• Strange Quarkonium States at BESIII
• Towards the (Mexican) discovery of second class currents at Belle-II