${{\mathit J / \psi}{(1S)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \eta}_{{{c}}}{(1S)}}$
INSPIRE search
M026R65
M026R66
M026R67
M026R68
M026R80
M026R71
M026R72
M026R73
M026R79
M026R84
M026R88
M026R93
M026R97
M026R99
M026P03
M026P05
M026P06
M026P08
M070R85
M026R64