$\Gamma\mathrm {(( {{\mathit e}^{+}} {{\mathit e}^{-}} )_{\mathit J = 0} \rightarrow 3 {{\mathit \gamma}} )}/\Gamma\mathrm {(( {{\mathit e}^{+}} {{\mathit e}^{-}} )_{\mathit J = 0} \rightarrow 2 {{\mathit \gamma}} )}$

INSPIRE   PDGID:
S050J0
VALUE CL% DOCUMENT ID
$\bf{<1 \times 10^{-5}}$ 90
MILLS
1967
Conservation Laws:
CHARGE CONJUGATION ($\mathit C$) INVARIANCE
References:
MILLS 1967
PRL 18 420 Search for $\mathit C$ Nonconservation in Electron-Positron Annihilation