Study of the XYZ states at the BESIII

TL;DR

This paper reviews BESIII's extensive findings on XYZ and conventional charmonium states, including new observations and measurements that enhance understanding of these particles, with implications for future research directions.

Contribution

It provides a comprehensive review of BESIII's experimental results on XYZ states, including new observations and cross-section measurements, advancing the field's knowledge.

Findings

Observation of Zc(3900) and Zc(4020) states

Measurement of cross-sections for omega chi_cJ and eta J/psi

Searches for e+e- to gamma chi_cJ and gamma Y(4140)

Abstract

With its unique data samples at energies of 3.8--4.6 GeV, the BESIII experiment made a significant contribution to the study of charmonium and charmonium-like states, i.e., the XYZ states. We review the results for observations of the Zc(3900) and Zc(4020) states, the X(3872) in e+e- annihilation, and charmonium psi(1^3D_2) state, as well as measurements of the cross-sections of omega chi_cJ and eta J/psi, and the search for e+e- to gamma chi_cJ and gamma Y(4140). We also present data from BESIII that may further strengthen the study of the XYZ and conventional charmonium states, and discuss perspectives on future experiments.