STRANGE MESONS
($\mathit S$ = $\pm1$, $\mathit C$ = $\mathit B$ = 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 		INSPIRE   JSON PDGID:
S011

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

$I(J^P)$ = $1/2(0^{-})$ 
Expand/Collapse All
${{\mathit K}^{0}}$ 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${}^{2}$ 
 
▸  $\mathit T$-VIOLATION PARAMETER IN ${{\mathit K}^{0}}-{{\overline{\mathit K}}^{0}}$ MIXING
▸  $\mathit CP$-VIOLATION PARAMETERS
▸  $\mathit CPT$-VIOLATION PARAMETERS
$\vert{}{\mathit m}_{{{\mathit K}^{0}}}-{\mathit m}_{{{\overline{\mathit K}}^{0}}}\vert{}/{\mathit m}_{\mathrm {average}}$ [1] $<6$ $\times 10^{-19}$   CL=90%
 
(${\Gamma}_{{\mathit K}^{0}}−{\Gamma}_{{\overline{\mathit K}}^{0}})/{\mathit m}_{{\mathrm {average}}}$ ($8$ $\pm8$) $ \times 10^{-18}$  
 
▸  TESTS OF $\Delta \mathit S$ = $\Delta \mathit Q$ RULE
[1] Derived from measured values of $\phi _{+−}$, $\phi _{{\mathrm {00}}}$, $\vert \eta \vert $, $\vert{}{\mathit m}_{{{\mathit K}_L^0} }–{\mathit m}_{{{\mathit K}_S^0} }\vert{}$, and ${\mathit \tau}_{{{\mathit K}_S^0} }$, as described in the introduction to ``Tests of Conservation Laws.''