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Search for C-parity violation in J/ψ → γγ and γφ
Using 1.06×108 ψ(3686) events recorded in e+e− collisions at s√=3.686 GeV with the BESIII at the BEPCII collider, we present searches for C-parity violation in J/ψ→γγ and γϕ decays via ψ(3686)→J/ψπ+π−. No significant ...
Observation of e +e − → π 0π 0hc and a neutral charmoniumlike structure Zc(4020)0
Using data collected with the BESIII detector operating at the Beijing Electron Positron Collider at center-of-mass energies of s√=4.23, 4.26, and 4.36 GeV, we observe e+e−→π0π0hc for the first time. The Born cross sections ...