Recent results on charmonium-like (exotic) XYZ states at the BESIII/BEPCII experiment in Beijing/China

TL;DR

This paper reports recent experimental results from BESIII on exotic charmonium-like XYZ states, including spin-parity measurements, line-shape analyses, and new process observations, advancing understanding of these complex states.

Contribution

It presents new measurements and observations of XYZ states and related processes, providing valuable data for understanding their nature and properties.

Findings

Determined spin-parity of Zc(3900)

Analyzed line-shapes of various e+e- to charmonium and open charm processes

Observed e+e- to phi chi_c1/2 at 4.6 GeV

Abstract

With about 12 fb$^{-1}$ collected XYZ data sets, BESIII continues the exploration of the exotic charmonium-like states. In this talk, recent results on the measurements of the spin-parity determination of $Z_{\rm c}(3900)$, as well as on line-shapes of $e^+e^- \rightarrow J/\psi\,\pi\pi, h_{\rm c}\pi\pi, \psi(2S)\,\pi^0\pi^0/\pi^+\pi^-$, and $\pi^+ D^0 D^{*-}$ from open charm are discussed. Also, the recent observation of $e^+ e^- \rightarrow \phi \chi_{c1/2}$ at $\sqrt(s)=4.6$ GeV is reported.