# ${{\boldsymbol A}_{{S}}}$ = [ $\Gamma\mathrm {( {{\boldsymbol K}_S^0} \rightarrow {{\boldsymbol \pi}^{-}} {{\boldsymbol e}^{+}} {{\boldsymbol \nu}_{{e}}} )} - \Gamma\mathrm {( {{\boldsymbol K}_S^0} \rightarrow {{\boldsymbol \pi}^{+}} {{\boldsymbol e}^{-}} {{\overline{\boldsymbol \nu}}_{{e}}} )}$ ] $/$ SUM INSPIRE search

Such asymmetry violates $\mathit CP$. If $\mathit CPT$ is assumed then ${{\mathit A}_{{S}}}$ = 2 Re($\epsilon$).
VALUE ($10^{-3}$) EVTS DOCUMENT ID TECN
$-3.8$ $\pm5.0$ $\pm2.6$ 83K 1
 2018 A
KLOE
• • • We do not use the following data for averages, fits, limits, etc. • • •
$1.5$ $\pm9.6$ $\pm2.9$ 13k
 2006 E
KLOE
1  ANASTASI 2018A result is a combination of the new measurement and AMBROSINO 2006E. The new ANASTASI 2018A measurement using data collected from $2004 - 2005$, which corresponds to an integrated luminosity of 1.63 fb${}^{-1}$ is A$_{S}=-0.0049$ $\pm0.0057$ $\pm0.0026$.
Conservation Laws:
 $\mathit CP$ INVARIANCE
References:
 ANASTASI 2018A
JHEP 1809 021 Measurement of the charge asymmetry for the $K_S \rightarrow \pi e \nu$ decay and test of CPT symmetry with the KLOE detector
 AMBROSINO 2006E
PL B636 173 Study of the Branching Ratio and Charge Asymmetry for the Decay ${{\mathit K}_S^0}$ $\rightarrow$ ${{\mathit \pi}}{{\mathit e}}{{\mathit \nu}}$ with the KLOE Detector