$\mathit CP$ VIOLATION TESTS IN ${{\mathit K}^{\pm}}$ DECAYS

$\Delta $ = ($\Gamma\mathrm {({{\mathit K}^{+}} )}$ $−$ $\Gamma\mathrm {({{\mathit K}^{-}} )}$) $/$ ($\Gamma\mathrm {({{\mathit K}^{+}} )}$ + $\Gamma\mathrm {({{\mathit K}^{-}} )}$)

$\Delta $( ${{\mathit K}^{\pm}}$ $\rightarrow$ ${{\mathit \pi}^{\pm}}{{\mathit e}^{+}}{{\mathit e}^{-}}$ ) RATE DIFFERENCE/SUM

INSPIRE  
VALUE ($ 10^{-2} $) DOCUMENT ID TECN
$-2.2$ $\pm1.5$ $\pm0.6$ 1
BATLEY
2009
NA48
1  This implies an upper limit of $0.021$ at 90$\%$ CL.
Conservation Laws:
$\mathit CP$ INVARIANCE
References:
BATLEY 2009
PL B677 246 Precise Measurement of the ${{\mathit K}^{\pm}}$ $\rightarrow$ ${{\mathit \pi}^{\pm}}{{\mathit e}^{+}}{{\mathit e}^{-}}$ Decay