Search for new decay modes of the ${\psi }_2(3823)$ and the process $e^{+}{e}^{-}\to {\pi }^0{\pi }^0{\psi }_2(3823)$

Abstract

The decays ${\psi }_2(3823)\to \gamma {\chi }_{c0,1,2},{\pi }^{+}{\pi }^{-}J/\psi ,{\pi }^0{\pi }^{0}J/\psi ,\eta J/\psi$, and ${\pi }^{0}J/\psi$ are searched for using the reaction $e^{+}{e}^{-}\to {\pi }^{+}{\pi }^{-}{\psi }_2(3823)$ in a 19 fb${}^{-1}$ data sample collected at center-of-mass energies between 4.1 and 4.7 GeV with the BESIII detector. The process ${\psi }_2(3823)\to \gamma {\chi }_{c1}$ is observed in a 9 fb${}^{-1}$ data sample in the center-of-mass energy range 4.3 to 4.7 GeV, which confirms a previous observation but with a higher significance of $11.8\sigma$, and evidence for ${\psi }_2(3823)\to \gamma {\chi }_{c2}$ is found with a significance of $3.2\sigma$ for the first time. The branching-fraction ratio $\frac{\mathcal{B}({\psi }_2(3823)\to \gamma {\chi }_{c2})}{\mathcal{B}({\psi }_2(3823)\to \gamma {\chi }_{c1})}$ is determined. No significant ${\psi }_2(3823)$ signals are observed for any of the other decay channels. Upper limits of branching-fraction ratios for ${\psi }_2(3823)\to {\pi }^{+}{\pi }^{-}J/\psi ,{\pi }^0{\pi }^{0}J/\psi ,\eta J/\psi ,{\pi }^{0}J/\psi ,\gamma {\chi }_{c0}$ relative to ${\psi }_2(3823)\to \gamma {\chi }_{c1}$ are reported. The process $e^{+}{e}^{-}\to {\pi }^0{\pi }^0{\psi }_2(3823)$ is also searched for, and we find evidence for the process with a significance of $4.3\sigma$. The average cross-section ratio $\frac{\sigma (e^{+}{e}^{-}\to {\pi }^0{\pi }^0{\psi }_2(3823))}{\sigma (e^{+}{e}^{-}\to {\pi }^{+}{\pi }^{-}{\psi }_2(3823))}$ is also determined.

arXiv comment8 pages, 4 figures

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Cited by in corpus (5)

• 50 Years of Quantum Chromodynamics
• Observation of resonance structures in $e^{+}{e}^{-}\to {\pi }^{+}{\pi }^{-}{\psi }_2(3823)$ and mass measurement of ${\psi }_2(3823)$
• The electromagnetic decays of $X(3823)$ as the ${\psi }_2(1^3{D}_2)$ state and its radial excited states
• Search for the radiative transition ${\chi }_{c1}(3872)\to \gamma {\psi }_2(3823)$
• Study of $e^{+}{e}^{-}\to {\pi }^{0}X(3872)\gamma$ and search for $Z_c(4020{)}^0\to X(3872)\gamma$