Study of Charmonium(-like) Spectroscopy and Decay at BESIII

TL;DR

This paper reviews recent experimental results on Charmonium and Charmonium-like states at BESIII, including new particle observations, decay modes, cross sections, and properties of specific states, advancing understanding of quarkonium spectroscopy.

Contribution

It presents new experimental findings on Charmonium states, decay channels, and resonance structures, providing comprehensive data that enhance knowledge of quarkonium spectroscopy and decay mechanisms.

Findings

Observation of Z_{cs}(3985) state

Measurement of cross sections for e^+e^- processes

Branching fractions for various Charmonium decays

Abstract

The recent results on Charmonium and Charmonium-like states at BESIII are reviewed, including the observation of $\rm Z_{cs}(3985)$ state, the study of the new decay modes of $\psi_2(3823)$ state, observation of resonance structure in $\rm e^+e^- \to \pi^+\pi^-\psi_2(3823)$ process, the study of the $\rm e^+e^- \to K^+K^-J/\psi$ process, cross section measurement of $\rm e^+e^- \to \omega\pi^0$ and $\omega\eta$ process, branching fraction measurement of $\psi(3686)\to\bar{\Sigma}^0\Lambda + c.c.$ process. Decay channels for $\chi_{cJ} \to \Lambda\bar{\Lambda}$, $\chi_{cJ} \to \Lambda\bar{\Lambda}\eta$, $\psi(3686) \to \Lambda\bar{\Lambda}\omega$ and $\eta_c(2S)\to3(\pi^+\pi^-)$ are also discussed. The property of the spin singlet P wave Charmonium state, $\rm h_c$ is also reported.