Measurements of charmonia decays from BESIII

Abstract

In this talk, recent measurements of charmonium decays of BESIII are presented. Using 448 million $\psi (3686)$ events collected with the BESIII detector, the branching fractions of the decays ${\chi }_{cJ}\to \varphi \varphi (J=0,1,2)$ have been measured most precisely, and the polarization parameters of ${\chi }_{cJ}\to \varphi \varphi$ have been determined for the first time via a helicity amplitude analysis. Using the same data sample as in the previous study, first evidence of ${\eta }_c(2S)\to {\pi }^{+}{\pi }^{-}\eta$ has been found in the decay sequence $\psi (3686)\to \gamma {\eta }_c(2S)(\to {\pi }^{+}{\pi }^{-}\eta )$. The product of the branching fractions of $\psi (3686)\to \gamma {\eta }_c(2S)$ and ${\eta }_c(2S)\to {\pi }^{+}{\pi }^{-}\eta$ is reported as well as the individual branching fraction of ${\eta }_c(2S)\to {\pi }^{+}{\pi }^{-}\eta$. The process $e^{+}{e}^{-}\to \eta J/\psi$ at a center-of-mass energy $3.773\mathrm{GeV}$ is observed for the first time. Its Born cross-section is measured, and the branching fraction of $\psi (3770)\to \eta J/\psi$ is determined by a combined fit with the cross sections at other energy points, after considering the interference effect for the first time. Utilizing 2708 million $\psi (3686)$ events collected by the BESIII detector, the decays ${\chi }_{cJ}\to {\Omega }^{-}{\bar{\Omega }}^{+}(J=0,1,2)$ have been observed for the first time with high significance via the radiative decays of $\psi (3686)\to \gamma {\chi }_{cJ}$. The relevant branching fractions have been provided.

arXiv commentProceeding article for 21st Conference on Flavor Physics and CP Violation (FPCP 2023) 15 pages, 9 figures, 4tables

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• Future Physics Programme of BESIII
• Quest for precision in hadronic cross sections at low energy: Monte Carlo tools vs. experimental data
• Quarkonia and their transitions
• Effect of charmed meson loops on charmonium transitions
• Observation of psi(3770)--> pi pi J/psi and Measurement of Gamma_{ee}[psi(2S)]
• Towards a dynamical understanding of the non-$D\bar{D}$ decay of $\psi (3770)$
• The evasion of helicity selection rule in ${\chi }_{c1}\to VV$ and ${\chi }_{c2}\to VP$ via intermediate charmed meson loops
• Colour Octet Contribution in Exclusive P-Wave Charmonium Decay into Octet and Decuplet Baryons
• Observation of the $Y(4220)$ and $Y(4360)$ in the process $e^{+}{e}^{-}\to \eta J/\psi$
• QCD prediction for the non-$D\bar{D}$ annihilation decay of $\psi (3770)$
• Further understanding of the non-$D\bar{D}$ decays of $\psi (3770)$
• The lineshape of $\psi (3770)$ and low-lying vector charmonium resonance parameters in $e^{+}{e}^{-}\to D\bar{D}$
• Observation of ${\chi }_{c1}$ decays into vector meson pairs $\varphi \varphi$, $\omega \omega$, and $\omega \varphi$
• Open charm effects in $e^{+}{e}^{-}\to J/\psi \eta$, $J/\psi {\pi }^0$ and $\varphi {\eta }_c$
• The $\bar{c}c$ purity of $\psi (3770)$ and ${\psi }^{\prime }$ challenged
• Modeling Charmonium-$\eta$ Decays of $J^{PC}=1^{--}$ Higher Charmonia
• Isospin violating decay of $\psi (3770)\to J/\psi +{\pi }^0$
• Detecting the polarization in ${\chi }_{cJ}\to \varphi \varphi$ decays to probe hadronic loop effect
• Evidence for ${\eta }_c$(2S)$\to\pipieta$ decay
• Observation of the decay ${\chi }_{cJ}\to {\Omega }^{-}{\bar{\Omega }}^{+}$

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