Abstract
Using a sample of $4.48\times10^{8}$ $\psi(3686)$ events collected with the BESIII detector at the BEPCII collider, we study the two-photon decays of the pseudoscalar mesons $\pi^0$, $\eta$, $\eta^\prime$, $\eta(1405)$, $\eta(1475)$, $\eta(1760)$, and $X(1835)$ in $J/\psi$ radiative decays using $\psi(3686)\to\pi^{+}\pi^{-}J/\psi$ events. The $\pi^0$, $\eta$ and $\eta^\prime$ mesons are clearly observed in the two-photon mass spectra, and the branching fractions are determined to be $B(J/\psi\to\gamma\pi^{0}\to3\gamma)=(3.57\pm0.12\pm0.16)\times10^{-5}$, $B(J/\psi\to\gamma\eta\to3\gamma)=(4.42\pm0.04\pm0.18)\times10^{-4}$, and $B(J/\psi\to\gamma\eta'\to3\gamma)=(1.26\pm0.02\pm0.05)\times10^{-4}$, where the first errors are statistical and the second systematic. No clear signal for $\eta(1405)$, $\eta(1475)$, $\eta(1760)$ or $X(1835)$ is observed in the two-photon mass spectra, and upper limits at the $90\%$ confidence level on the product branching fractions are obtained.
Highlights
Using a sample of 4.48 × 108 ψð3686Þ events collected with the BESIII detector at the BEPCII collider, we study the two-photon decays of the pseudoscalar mesons π0, η, η0, ηð1405Þ, ηð1475Þ, ηð1760Þ, and Xð1835Þ in J=ψ radiative decays using ψð3686Þ → πþπ−J=ψ events
MethodsZ. Bai et al (BES Collaboration), Phys
Summary
The nature of the Xð1835Þ is still an open question a number of theoretical interpretations have been proposed, including an NNbound state [11], baryonium with sizable gluon content [12,13], a pseudoscalar glueball [14], a radial excitation of the η0 [15], and an ηc-glueball mixture [16]. None of these interpretations have been completely ruled out or confirmed. We search for the two-photon decays of the pseudoscalar mesons, ηð1405Þ, ηð1475Þ, ηð1760Þ and Xð1835Þ
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