arxiv: 2510.15247 · v1 · submitted 2025-10-17 · ✦ hep-ex
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Study of the Magnetic Dipole Transition of J/psitoγη_c via η_cto pbar{p}
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Using $(10.087\pm0.044)\times10^9$ $J/\psi$ events collected with the BESIII detector at the $e^+e^-$ BEPCII collider, we present the first amplitude analysis of $J/\psi\to\gamma p\bar{p}$ with the $p\bar p$ invariant mass in the $\eta_c$ mass region $[2.70,3.05]$~GeV/$c^2$. The product branching fraction $\mathcal{B}(J/\psi\to\gamma\eta_c)\times\mathcal{B}(\eta_c\to p\bar{p})$ is precisely determined to be $(2.11\pm0.02_{\rm stat}\pm0.07_{\rm syst})\times10^{-5}$. Combining with the product branching fractions $\mathcal{B}(\eta_c\to p\bar{p})\times\mathcal{B}(\eta_c\to \gamma\gamma)$ and $\mathcal{B}(J/\psi\to\gamma\eta_c)\times\mathcal{B}(\eta_c\to \gamma\gamma)$, the branching fractions of $\mathcal{B}(J/\psi\to\gamma\eta_c)$ and $\mathcal{B}(\eta_c\to\gamma\gamma)$ are calculated to be $(2.29\pm0.01_{\rm stat}\pm0.04_{\rm syst}\pm0.18_{\rm opbf})\%$ and $(2.28\pm0.01_{\rm stat}\pm0.04_{\rm syst}\pm0.18_{\rm opbf})\times10^{-4}$, respectively, which are consistent with the latest lattice quantum chromodynamics calculations. Here, opbf is the uncertainty from the other product branching fractions used in the calculation.
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hep-ph 2026-05 unverdicted novelty 5.0
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