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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BESIII extracts branching fractions for ψ(3686)→p p-bar π⁰ and ψ(3686)→p p-bar η (two solutions each) and measures the N(1535) width ratio Γ(Nη)/Γ(Nπ) = 0.99 ± 0.05 ± 0.19 from partial-wave fits.
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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.
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Partial wave analyses of $\psi(3686)\to p\bar{p}\pi^0$ and $\psi(3686)\to p\bar{p}\eta$
BESIII extracts branching fractions for ψ(3686)→p p-bar π⁰ and ψ(3686)→p p-bar η (two solutions each) and measures the N(1535) width ratio Γ(Nη)/Γ(Nπ) = 0.99 ± 0.05 ± 0.19 from partial-wave fits.