Measurement of branching fractions for $\psi (3686)\to \gamma {\eta }^{\prime },\gamma \eta$ and $\gamma {\pi }^0$

Abstract

Using a data sample of $448\times 10^6$ $\psi (3686)$ events collected with the BESIII detector operating at the BEPCII storage ring, the decays $\psi (3686)\to \gamma \eta$ and $\psi (3686)\to \gamma {\pi }^0$ are observed with a statistical significance of $7.3\sigma$ and $6.7\sigma$, respectively. The branching fractions are measured to be $\mathcal{B}(\psi (3686)\to \gamma \eta )=(0.85\pm 0.18\pm 0.05)\times 10^{-6}$ and $\mathcal{B}(\psi (3686)\to \gamma {\pi }^0)=(0.95\pm 0.16\pm 0.05)\times 10^{-6}$. In addition, we measure the branching fraction of $\psi (3686)\to \gamma {\eta }^{\prime }$ to be $\mathcal{B}(\psi (3686)\to \gamma {\eta }^{\prime })=(125.1\pm 2.2\pm 6.2)\times 10^{-6}$, with improved precision compared to previous results.

References in corpus (13)

• Design and Construction of the BESIII Detector
• The Precision Monte Carlo Event Generator KK For Two-Fermion Final States In e+e- Collisions
• Coherent Exclusive Exponentiation For Precision Monte Carlo Calculations
• Mixing and Decay Constants of Pseudoscalar Mesons: The Sequel
• Search for hadronic transition ${\chi }_{cJ}\to {\eta }_c{\pi }^{+}{\pi }^{-}$ and observation of ${\chi }_{cJ}\to K\bar{K}\pi \pi \pi$
• Determination of the number of ${\psi }^{\prime }$ event at BESIII
• Measurement of the Matrix Elements for the Decays $\eta \to {\pi }^{+}{\pi }^{-}{\pi }^0$ and $\eta /{\eta }^{\prime }\to {\pi }^0{\pi }^0{\pi }^0$
• Charmonium decays to gamma pi0, gamma eta, and gamma eta'
• Evidence for psi' decays into gamma pi^0 and gamma eta
• Understanding the radiative decays of vector charmonia to light pseudoscalar mesons
• Observation of $h_c$ radiative decay $h_c\to \gamma {\eta }^{\prime }$ and evidence for $h_c\to \gamma \eta$
• Meson-Photon Transition Form Factors in the Charmonium Energy Range
• Ultimate survival in anomalous psi(2S) decays

Cited by in corpus (1)

• Revisiting the $P$-wave charmonium radiative decays $h_c\to \gamma {\eta }^{(\prime )}$ with relativistic corrections