First observation of the Dalitz transition h_c → e⁺e⁻ η_c at 5.4σ significance with measured branching fraction ratio of 0.59% relative to the radiative decay h_c → γ η_c.
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Observation of the Electromagnetic Dalitz Transition $h_c \rightarrow e^+e^-\eta_c$
First observation of the Dalitz transition h_c → e⁺e⁻ η_c at 5.4σ significance with measured branching fraction ratio of 0.59% relative to the radiative decay h_c → γ η_c.