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:
S012

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

$I(J^P)$ = $1/2(0^{-})$ 
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▸  ${{\mathit K}_S^0}$ MEAN LIFE
▸  ${{\mathit K}_S^0}$ FORM FACTORS
${{\mathit A}_{{{S}}}}$ = [ $\Gamma\mathrm {({{\mathit K}_S^0} \rightarrow {{\mathit \pi}^{-}} {{\mathit e}^{+}} {{\mathit \nu}_{{{e}}}})} - \Gamma\mathrm {({{\mathit K}_S^0} \rightarrow {{\mathit \pi}^{+}} {{\mathit e}^{-}} {{\overline{\mathit \nu}}_{{{e}}}})}$ ] / SUM $-0.004$ $\pm0.006$  
 
▸  PARAMETERS FOR ${{\mathit K}_S^0}$ $\rightarrow$ 3 ${{\mathit \pi}}$ DECAY
▸  DECAY-PLANE ASYMMETRY IN ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit e}^{+}}{{\mathit e}^{-}}$ DECAYS
Mode  
Fraction ($\Gamma_i$ / $\Gamma$) Scale Factor/
Conf. Level		 P(MeV/c)  
▸  Hadronic modes
▸  Modes with photons or ${{\mathit \ell}}{{\overline{\mathit \ell}}}$ pairs
▸  Semileptonic modes
▸  $\mathit CP$ violating ($\mathit CP$) and $\Delta \mathit S$ = 1 weak neutral current ($\mathit S1$) modes
[1] See the Particle Listings below for the energy limits used in this measurement.
[2] Most of this radiative mode, the low-momentum ${{\mathit \gamma}}$ part, is also included in the parent mode listed without ${{\mathit \gamma}}$'s.
[3] The value is for the sum of the charge states or particle/antiparticle states indicated.
[4] Not a measurement. Calculated as 0.666$\cdot{}B({{\mathit \pi}^{\pm}}{{\mathit e}^{\mp}}{{\mathit \nu}_{{{e}}}}$).
Constrained Fit information