Measurement of the branching fractions for $J/\psi \to \gamma {\pi }^0$, $\gamma \eta$ and $\gamma {\eta }^{\prime }$

Abstract

The decay modes $\jpsi\arγπ^0, γη$ and $γ\etap$ are analyzed using a data sample of 58 million $\jpsi$ decays collected with the BESII detector at BEPC. The branching fractions are determined to be: $Br(\jpsi\arγπ^0)=(3.13^{+0.65}_{-0.44})\times10^{-5}$, $Br(\jpsi\arγη)=(11.23\pm0.89)\times10^{-4}$, and $Br(\jpsi\arγ\etap)=(5.55\pm0.44)\times10^{-3}$, where the errors are combined statistical and systematic errors. The ratio of partial widths $Γ(\jpsi\arγ\etap)/Γ(\jpsi\arγη)$ is measured to be $4.94\pm 0.40$, and the singlet-octet pseudoscalar mixing angle of $η-\etap$ system is determined to be ${\theta }_P=(-22.08\pm 0.81{)}^{\circ }$.

20 pages, 10 figures

Cited by in corpus (11)

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• Physics Accomplishments and Future Prospects of the BES Experiments at the BEPC Collider
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• Revisiting the $P$-wave charmonium radiative decays $h_c\to \gamma {\eta }^{(\prime )}$ with relativistic corrections
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• Comprehensive Calculations on the OZI-forbidden Nonleptonic Decays of Orthoquarkonia $J/\psi ({\rm Y})\to \pi \pi ,\rho \pi$
• Study of two-photon decays of pseudoscalar mesons via $J/\psi$ radiative decays