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Search for psi(3686)to γη_c(η(1405))to γ π⁺π⁻π⁰
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arxiv 1707.05178 v2 pith:VDV236NU submitted 2017-07-17 hep-ex
Search for psi(3686)to γη_c(η(1405))to γ π⁺π⁻π⁰
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Using a sample of $448.1\times10^{6}$ $\psi(3686)$ events collected with the BESIII detector, a search for the isospin violating decay $\eta_{c}\to\pi^{+}\pi^{-}\pi^{0}$ via $\psi(3686)\to\gamma\eta_{c}$ is presented. No signal is observed, and the upper limit on $\mathcal{B}(\psi(3686)\to \gamma\eta_{c}\to \gamma\pi^{+}\pi^{-}\pi^{0} )$ is determined to be $1.6\times10^{-6}$ at the $90\%$ confidence level. In addition, a search for $\eta(1405)\to f_{0}(980)\pi^{0}$ in $\psi(3686)$ radiative decays is performed. No signal is observed, and the branching fraction $\mathcal{B}(\psi(3686)\to\gamma\eta(1405)\to \gamma f_{0}(980)\pi^{0}\to\gamma \pi^+\pi^-\pi^0 )$ is calculated to be less than $ 5.0\times10^{-7}$ at the $90\%$ confidence level.
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Probing the dark axion portal via $J/\psi$ decays at BESIII and STCF
hep-ph 2026-06 unverdicted novelty 4.0
Monte Carlo studies show BESIII data already reaches previously unexplored regions of the dark axion portal via J/ψ → a γ' decays, with STCF projected to improve sensitivity by about an order of magnitude.
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