BESIII reports first observation of a threshold enhancement in the π⁺π⁻ mass spectrum from ψ(3686)→π⁺π⁻J/ψ with fitted mass 285.6±2.5 MeV/c², width 16.3±0.9 MeV and >10σ significance.
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Observation of a threshold enhancement in the $\pi^+\pi^-$ spectrum in $\psi(3686) \rightarrow \pi^{+}\pi^{-}J/\psi$ decays
BESIII reports first observation of a threshold enhancement in the π⁺π⁻ mass spectrum from ψ(3686)→π⁺π⁻J/ψ with fitted mass 285.6±2.5 MeV/c², width 16.3±0.9 MeV and >10σ significance.