Observation of Z_{c} (3900)^{0} in e^{+} e^{−} →π^{0} π^{0} J/ψ

Author(s): M. Ablikim et al. (BESIII Collaboration)

The neutral partner of the four-quark state $Zc(3900{)}^{+-}$ is observed in electron-positron collisions by the BESIII Collaboration.

[Phys. Rev. Lett. 115, 112003] Published Fri Sep 11, 2015