Abstract

Using about 226×106226\times 10^6 $\jpsi$ events and 106×106106\times 10^6 ψ′ψ^{\prime} events collected with the BESIII detector at the BEPCII e+e−e^+e^- collider, the Dalitz plot of $\etap \to ηπ^+ π^-$ decay is studied, the direct measurement of a00(980)−f0(980)a^{0}_{0}(980)-f_{0}(980) mixing is performed, X(2120)X(2120) and X(2370)X(2370) are observed in the π+π−η′π^+π^-η^\prime invariant mass spectrum, ψ′→γπ0ψ^{\prime}\toγπ^0 and ψ′→γηψ^{\prime}\toγη are observed for the first time, and the decays χcJ→γVχ_{cJ}\toγV (V=ϕV=ϕ, ρ0ρ^0, ωω) are studied.

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