BESIII reports a novel extraction of hyperon form factors via vacuum polarization enhancement at J/psi, yielding R = 0.860 ± 0.029 ± 0.010 and phase differences of 1.011 ± 0.094 ± 0.010 rad and 2.128 ± 0.094 ± 0.010 rad for the two charge-conjugate channels, with CP symmetry consistent.
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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.
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Novel method to extract the femtometer structure of strange baryons using the vacuum polarization effect
BESIII reports a novel extraction of hyperon form factors via vacuum polarization enhancement at J/psi, yielding R = 0.860 ± 0.029 ± 0.010 and phase differences of 1.011 ± 0.094 ± 0.010 rad and 2.128 ± 0.094 ± 0.010 rad for the two charge-conjugate channels, with CP symmetry consistent.
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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.