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Using 586 pb$^{-1}$ of $e^+e^-$ annihilation data taken with the CLEO-cdetector at $\sqrt{s}=4170$ MeV, the peak of the charmonium resonance$\psi(4160)$, we analyze the decay $\psi(4160)\to \pi^+\pi^- J/\psi$, andreport observation of the charged state $Z_c^\pm(3900)$ decaying into $\pi^\pmJ/\psi$ at a significance level of $>5 \sigma$. We obtain$M(Z_c^\pm)=3886\pm4(\text{stat})\pm 2(\text{syst})$ MeV and$\Gamma(Z_c^\pm)=37\pm4(\text{stat})\pm 8(\text{syst})$ MeV, which are in goodagreement with the results for this resonance obtained by the BES III and BelleCollaborations in the decay of the resonance Y(4260). We also present firstevidence for the production of the neutral member of this isospin triplet,$Z_c^0(3900)$ decaying into $\pi^0J/\psi$ at a $3.5\sigma$ significance level.

Observation of the Charged Hadron $Z_c^{\pm}(3900)$ and Evidence for the Neutral $Z_c^0(3900)$ in $e^+e^-\to \pi\pi J/\psi$ at $\sqrt{s}=4170$ MeV