Exotic hadrons from BESIII

Abstract

We report the progress in the study of the exotic hadrons, also called XYZ states, at BESIII experiment with its unique data samples in e + e − annihilation at center-of-mass energies of 3.8–4.6 GeV. The talk covers the observation of the Z c (3900) and Z c (4020) and new measurements related to them; updated measurement of the resonant parameters of the Y (4260) in e + e − → π + π − J /ψ and discovery of its new decay modes π + π − ψ(2 S ), ωχ c 0, π + π − h c , and D 0 D ∗− π + + c.c. ; and observation of X (3872) in e + e − annihilation.