${{\mathit \eta}_{{{c}}}{(1S)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \gamma}}$
INSPIRE search
M026W1
M026G10
M026G09
M026G08
M026G07
M026G03
M026G04
M026G19
M026G20
M026G14
M026G15
M026G02
M026G27
M026G11
M026G01
M026R31
M026R32
M026P08
M026P09
S041B08