High Energy Physics - Experiment
[Submitted on 24 Mar 2026 (v1), last revised 29 Apr 2026 (this version, v2)]
Title:Amplitude Analysis of the Isospin-Violating Decay $J/ψ\rightarrowγηπ^{0}$
View PDF HTML (experimental)Abstract:Using $(10\,087 \pm 44) \times 10^6$ $J/\psi$ events collected with the BESIII detector, we perform the first amplitude analysis of the process $J/\psi\to\gamma\eta\pi^0$. The decay is dominated by the intermediate processes $J/\psi\to\pi^0 b_1(1235)^0 \to\gamma\eta\pi^0$, $J/\psi\to\pi^{0}\rho(1450)^0 \to\gamma\eta \pi^0$ and $J/\psi\to\eta h_1(1170) \to\gamma\eta\pi^0$. Contributions from $J/\psi\to\gamma a_0(980)^0\to\gamma\eta\pi^0$, $J/\psi\to\gamma a_2(1320)^0\to\gamma\eta\pi^0$ and $J/\psi\to\gamma a_2(1700)^0\to\gamma\eta\pi^0$ are observed with a statistical significance exceeding $5\sigma$, constituting the first observation of radiative transitions of $J/\psi$ to isospin-triplet scalar mesons. The total branching fraction of $J/\psi\to\gamma \eta \pi^0$ is measured to be $(25.7\pm0.3\pm1.5)\times 10^{-6}$, where the first uncertainty is statistical and the second systematic. This result is consistent with the previous measurement, with the precision improved by more than a factor of two.
Submission history
From: Zekun Jia PhD. [view email][v1] Tue, 24 Mar 2026 11:23:21 UTC (234 KB)
[v2] Wed, 29 Apr 2026 13:39:05 UTC (525 KB)
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