${{\boldsymbol \eta}}$ WIDTH INSPIRE search

This is the partial decay rate $\Gamma\mathrm {( {{\mathit \eta}} \rightarrow {{\mathit \gamma}} {{\mathit \gamma}} )}$ divided by the fitted branching fraction for that mode. See the note at the start of the $\Gamma\mathrm {(2{{\mathit \gamma}})}$ data block, next below.
VALUE (keV)
$\bf{ 1.31 \pm0.05}$ OUR FIT
see fit info