No significant signal observed for J/ψ → D_s^- e^+ ν_e + c.c., setting branching fraction upper limit < 9.9 × 10^{-8} at 90% CL and improving prior constraints by an order of magnitude.
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Flux-averaged cross sections for n-bar p to K+K-pi+ and K+K-pi+pi0 are measured as 0.53 and 1.09 mb using tagged antineutrons from J/psi decays.
First amplitude analysis of J/ψ→γ p p-bar in the η_c region yields product branching fraction (2.11±0.02 stat ±0.07 syst)×10^{-5}, enabling derivation of B(J/ψ→γ η_c)=(2.29±0.01±0.04±0.18)% and B(η_c→γγ)=(2.28±0.01±0.04±0.18)×10^{-4} consistent with lattice QCD.
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Search for the charmonium semi-leptonic weak decay $J/\psi\rightarrow D_s^-e^+\nu_e+c.c.$
No significant signal observed for J/ψ → D_s^- e^+ ν_e + c.c., setting branching fraction upper limit < 9.9 × 10^{-8} at 90% CL and improving prior constraints by an order of magnitude.
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Cross Section Measurements of $\bar{n}p \rightarrow K^{+}K^{-}\pi^{+}(\pi^{0})$ via Antineutrons Produced by $J/\psi \to p \pi^{-} \bar{n}$ Decays
Flux-averaged cross sections for n-bar p to K+K-pi+ and K+K-pi+pi0 are measured as 0.53 and 1.09 mb using tagged antineutrons from J/psi decays.
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Study of the Magnetic Dipole Transition of $J/\psi\to\gamma\eta_c$ via $\eta_c\to p\bar{p}$
First amplitude analysis of J/ψ→γ p p-bar in the η_c region yields product branching fraction (2.11±0.02 stat ±0.07 syst)×10^{-5}, enabling derivation of B(J/ψ→γ η_c)=(2.29±0.01±0.04±0.18)% and B(η_c→γγ)=(2.28±0.01±0.04±0.18)×10^{-4} consistent with lattice QCD.