Observation of $J/\psi \to \gamma \eta {\pi }^0$

Abstract

We present the first study of the process $J/\psi \to \gamma \eta {\pi }^0$ using $(223.7\pm 1.4)\times 10^6$ $J/\psi$ events accumulated with the BESIII detector at the BEPCII facility. The branching fraction for $J/\psi \to \gamma \eta {\pi }^0$ is measured to be $\mathcal{B}(J/\psi \to \gamma \eta {\pi }^0)=(2.14\pm 0.18(stat)\pm 0.25(syst))\times 10^{-5}$. With a Bayesian approach, the upper limits of the branching fractions $\mathcal{B}(J/\psi \to \gamma a_0(980),a_0(980)\to \eta {\pi }^0)$ and $\mathcal{B}(J/\psi \to \gamma a_2(1320),a_2(1320)\to \eta {\pi }^0)$ are determined to be $2.5\times 10^{-6}$ and $6.6\times 10^{-6}$ at the 95\% confidence level, respectively. All of these measurements are given for the first time.

References in corpus (15)

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• Partial wave analyses of J/psi to gamma pi^+ pi^- and gamma pi^0 pi^0
• An amplitude analysis of the ${\pi }^0{\pi }^0$ system produced in radiative $J/\psi$ decays
• Partial wave analysis of $J/\psi \to \gamma \eta \eta$
• Study a0(980)-f0(980) mixing from a0(980) -> f0(980) transition
• Study of a0(980)--f0(980) mixing
• Observation of $J/\psi \to p\bar{p}{a}_0(980)$ at BESIII
• Isospin breaking in scalar and pseudoscalar channels of radiative $J/\psi$-decays

Cited by in corpus (9)

• A Review on Partial-wave Dynamics with Chiral Effective Field Theory and Dispersion Relation
• Evidence of the four-quark nature of $f_0(980)$ and $f_0(500)$
• Precision measurement of the branching fractions of ${\eta }^{\prime }$ decays
• Radiative production and decays of the exotic ${\eta }_1^{\prime }(1855)$ and its siblings
• Revisit of tensor-meson nonet in resonance chiral theory
• $J/\psi \to \gamma \pi \pi$, $\gamma {\pi }^0\eta$ reactions and the $f_0(980)$ and $a_0(980)$ resonances
• Search for the rare decay ${\eta }^{\prime }\to {\pi }^0{\pi }^0{\pi }^0{\pi }^0$ at BESIII
• Improved measurement of the decays ${\eta }^{\prime }\to {\pi }^{+}{\pi }^{-}{\pi }^{+(0)}{\pi }^{-(0)}$ and search for the rare decay ${\eta }^{\prime }\to 4{\pi }^0$
• Amplitude Analysis of the Isospin-Violating Decay $J/\psi \to \gamma \eta {\pi }^0$