Observation of a Threshold Enhancement in the π^{+}π^{-} Spectrum in ψ(3686)→π^{+}π^{-}J/ψ Decays. - Ablikim M; Achasov MN; Adlarson P; Ai XC; Aliberti R; Amoroso A; An Q; Bai Y; Bakina O; Ban Y; Bao HR; Batozskaya V; et al. (Physical review letters, 2026)