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STRANGE MESONS
($\boldsymbol S$ = $\pm1$, $\boldsymbol C$ = $\boldsymbol B$ = 0)
${{\mathit K}^{+}}$ = ${\mathit {\mathit u}}$ ${\mathit {\overline{\mathit s}}}$, ${{\mathit K}^{0}}$ = ${\mathit {\mathit d}}$ ${\mathit {\overline{\mathit s}}}$, ${{\overline{\mathit K}}^{0}}$ = ${\mathit {\overline{\mathit d}}}$ ${\mathit {\mathit s}}$, ${{\mathit K}^{-}}$ = ${\mathit {\overline{\mathit u}}}$ ${\mathit {\mathit s}}$, similarly for ${{\mathit K}^{*}}$'s

${{\boldsymbol K}^{0}}$ $I(J^P)$ = $1/2(0^{-})$

See related review:
$\mathit CPT$ Invariance Tests in Neutral Kaon Decay

${{\mathit K}^{0}}$ MASS

$497.611 \pm0.013$ MeV (S = 1.2)

${\mathit m}_{{{\mathit K}^{0}}}–{\mathit m}_{{{\mathit K}^{\pm}}}$

$3.934 \pm0.020$ MeV (S = 1.6)

${{\mathit K}^{0}}$ MEAN SQUARE CHARGE RADIUS

$-0.077 \pm0.010$ fm${}^{2}$

$\boldsymbol T$-VIOLATION PARAMETER IN ${{\boldsymbol K}^{0}}-{{\overline{\boldsymbol K}}^{0}}$ MIXING

ASYMMETRY $\mathit A_{\mathit T}$ IN ${{\mathit K}^{0}}-{{\overline{\mathit K}}^{0}}$ MIXING

$0.0066 \pm0.0016$

$\boldsymbol CP$-VIOLATION PARAMETERS

Re($\epsilon $)

$0.001596 \pm0.000013$

$\boldsymbol CPT$-VIOLATION PARAMETERS

REAL PART OF $\delta $

$(2.5 \pm2.3) \times 10^{-4}$

IMAGINARY PART OF $\delta $

$(-1.5 \pm1.6) \times 10^{-5}$

$0.0004 \pm0.0025$

$-0.0029 \pm0.0020$

$\vert{}{\mathit m}_{{{\mathit K}^{0}}}–{\mathit m}_{{{\overline{\mathit K}}^{0}}}\vert{}/{\mathit m}_{\mathrm {average}}$

$<6 \times 10^{-19}$ CL=90.0%

(${\Gamma}_{{\mathit K}^{0}}−{\Gamma}_{{\overline{\mathit K}}^{0}})/{\mathit m}_{{\mathrm {average}}}$

$(8 \pm8) \times 10^{-18}$

TESTS OF $\Delta \boldsymbol S$ = $\Delta \boldsymbol Q$ RULE

$-0.0009 \pm0.0030$