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Search for \(η_c(2S)\to 2(π^+π^-)\) and improved measurement of \(χ_{cJ}\to 2(π^+π^-)\)

By Besiii Collaboration and others
We search for the hadronic decay \(\eta_c(2S)\to 2(\pi^+\pi^-)\) in the \(\psi(3686)\to\gamma\eta_c(2S)\) radiative decay using \((27.12\pm 0.14)\times 10^8\) \(\psi(3686)\) events collected by the BESIII detector at the BEPCII collider. No significant signal is found, and the upper limit of \(\mathcal{B}[\psi(3686)\to\gamma\eta_c(2S)]\mathcal{B}[\eta_c(2S)\to 2(\pi^+\pi^-)]\) is determined to be \(0.78\times 10^{-6}\) at the 90\% confidence... Show more
April 7, 2024
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