Dalitz decay studies at BEPCⅢ

EM Dalitz decays could be sensitive and provide very rich information about meson structures, and they play an important role in constraining the uncertainties to (g-2)_μ. BEPCⅢ has performed and published several Dalitz decays,including η′→γe⁺e^-, J/ψ→Pe⁺e^-(P=η′,η /π⁰), η′→ωe⁺e^- etc. These processes are all observed and measured for the first time, furthering our knowledge about meson structures and meson interactions. Many more related work is ongoing and there will be more results to come, which will further test the theory against the measurements and could be sensitvie to the new physics beyond the standard model.