# Im($\eta _{+−0}){}^{2}$ = $\Gamma\mathrm {( {{\boldsymbol K}_S^0} \rightarrow {{\boldsymbol \pi}^{+}} {{\boldsymbol \pi}^{-}} {{\boldsymbol \pi}^{0}} , \boldsymbol CP-violating)}$ $/$ $\Gamma\mathrm {( {{\boldsymbol K}_L^0} \rightarrow {{\boldsymbol \pi}^{+}} {{\boldsymbol \pi}^{-}} {{\boldsymbol \pi}^{0}} )}$ INSPIRE search

$\mathit CPT$ assumed valid (i.e. Re($\eta _{+−0}$) $\simeq{}$ 0).
VALUE CL% EVTS DOCUMENT ID TECN
• • • We do not use the following data for averages, fits, limits, etc. • • •
$<0.23$ 90 601 1
 1985
HLBC
$<0.12$ 90 384
 1972
ASPK
1  BARMIN 1985 find Re($\eta _{+−0}$) = ($0.05$ $\pm0.17$) and Im($\eta _{+−0}$) = ($0.15$ $\pm0.33$). Includes events of BALDO-CEOLIN 1975 .
References:
 BARMIN 1985
NC 85A 67 Search for $\mathit CP$ Violation in the ${{\mathit K}^{0}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \pi}^{0}}$ Decay
 METCALF 1972
PL 40B 703 Experimental Study of the Time Dependent Rate of ${{\mathit K}^{0}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \pi}^{0}}$