Partial wave analysis of $J/\psi \to \gamma \eta \eta$

M. Ablikim, M. N. Achasov, O. Albayrak +358

Based on a sample of $2.25\times 10^8$ $J/\psi$ events collected with the BESIII detector at BEPCII, a full partial wave analysis on $J/\psi \to \gamma \eta \eta$ was performed using the relativistic…