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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Improved branching fractions for η' → π⁺π⁻π⁺π⁻ ((8.56±0.34)×10^{-5}) and η' → π⁺π⁻π⁰π⁰ ((2.12±0.16)×10^{-4}), upper limit <1.24×10^{-5} on η' → 4π⁰, and first extraction of α=1.22±0.37 from amplitude analysis.
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.
Requiring exotic Higgs decays to two or three light singlet scalars not to exceed the SM Higgs width yields cos θ < 0.12-0.13 for m_φ < 40 GeV, with predicted rate limits Γ(h→φφ) < 0.06 MeV and Γ(h→φφφ) < 5×10^{-6} MeV under stronger mixing bounds.
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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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Improved measurement of the decays $\eta' \to \pi^{+}\pi^{-}\pi^{+(0)}\pi^{-(0)}$ and search for the rare decay $\eta' \to 4\pi^{0}$
Improved branching fractions for η' → π⁺π⁻π⁺π⁻ ((8.56±0.34)×10^{-5}) and η' → π⁺π⁻π⁰π⁰ ((2.12±0.16)×10^{-4}), upper limit <1.24×10^{-5} on η' → 4π⁰, and first extraction of α=1.22±0.37 from amplitude analysis.
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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.
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Constraints on a Light Singlet Scalar from Combined Exotic Higgs Decays
Requiring exotic Higgs decays to two or three light singlet scalars not to exceed the SM Higgs width yields cos θ < 0.12-0.13 for m_φ < 40 GeV, with predicted rate limits Γ(h→φφ) < 0.06 MeV and Γ(h→φφφ) < 5×10^{-6} MeV under stronger mixing bounds.