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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This is a review summarizing experimental results on charmonium resonant parameters and observations of new charm baryon states from BESIII, Belle, LHCb, and CMS.
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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.
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Charmonium and Charm Spectroscopy
This is a review summarizing experimental results on charmonium resonant parameters and observations of new charm baryon states from BESIII, Belle, LHCb, and CMS.