Speaker
Yutie Liang
(Giessen University)
Description
The BESIII Experiment at the Beijing Electron Positron Collider (BEPCII) has accumulated the world's largest samples of $e^+e^-$ collisions in the tau-charm region. From the collected samples, which include $e^+e^-$ annihilations at J/psi, psi(2S), psi(3770) peaks and in the region from 4 GeV to 4.6 GeV, BESIII has produced many new results in the spectroscopy, transitions, and decays of charmonium(-like) states. This talk will review the current status of these analyses, which cover a wide range of topics from radiative and hadronic transitions among charmonium states, the productions and decays of the $XYZ$ states. Especially, the analysis of these samples has resulted in a number of surprising discoveries of the electrically charged "Zc" structures, which, if resonant, cannot be accommodated in the traditional charm quark and anti-charm quark picture of charmonium. In this talk, we will review the current status of the analyses of the Zc structures, as well as a number of other interesting features in the new BESIII data samples.
