Exotics at BESIII

INFN Sez. Ferrara and University of Ferrara - Via Saragat 1, Ferrara

^* e-mail: rfarinelli@fe.infn.it

Published online: 1 February 2019

Abstract

With a collected integrated luminosity of about 12 fb⁻¹, useful data set for XYZ new resonances, BESIII continues the exploration of these exotic charmonium-like states. In this proceeding, recent results on the measurements of the line-shape of e⁺e⁻ → π⁺π⁻ψ(3868) and π⁺D⁰D^*−, as well as the J^P determination of Z_C (3900) will be presented. An abundance of Y will be reported in several decay channels. Finally the present BESIII data above the $e^{+}{e}^{-}\to {\Lambda }_C{\overline{\Lambda }}_C$ threshold will be shortly discussed because they are barely in agreement with the current Belle data on the candidate charmed baryonium state Y(4660). A BEPCII upgrade, that will allow to settle this open question, has been funded.