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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  (beta) PDGID: S013

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

See related reviews:
$\mathit V_{{\mathit {\mathit u}}{\mathit {\mathit d}}}$, $\mathit V_{{\mathit {\mathit u}}{\mathit {\mathit s}}}$ the Cabibbo Angle, and CKM Unitarity
$\mathit CP$ Violation in ${{\mathit K}_L^0}$ Decays
$\Delta \mathit S$ = $\Delta \mathit Q$ in ${{\mathit K}^{0}}$ Decays

▸  Expand all sections   ▾  Collapse all sections

${\mathit m}_{{{\mathit K}_L^0} }–{\mathit m}_{{{\mathit K}_S^0} }$   $(52.93 \pm0.09) \times 10^{8}$ $\hbar{}$ s${}^{-1}$ (S = 1.3)  ...

${{\mathit K}_L^0}$ MEAN LIFE   $(5.116 \pm0.021) \times 10^{-8}$ s (S = 1.1)

▸ ENERGY DEPENDENCE OF ${{\mathit K}_L^0}$ DALITZ PLOT

▸ ${{\mathit K}_L^0}$ FORM FACTORS

▸ $\mathit CP$-VIOLATION PARAMETERS IN ${{\mathit K}_L^0}$ DECAYS

▸ PARAMETERS for ${{\mathit K}_L^0}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \gamma}}$ DECAY

$\mathit T$ VIOLATION TESTS IN ${{\mathit K}_L^0}$ DECAYS

Im($\xi $) in ${{\mathit K}_{{\mu3}}^{0}}$ DECAY (from transverse ${{\mathit \mu}}$ pol.)   $-0.007 \pm0.026$

▸ $\mathit CPT$-INVARIANCE TESTS IN ${{\mathit K}_L^0}$ DECAYS

▸ $\mathit x$ = A( ${{\overline{\mathit K}}^{0}}$ $\rightarrow$ ${{\mathit \pi}^{-}}{{\mathit \ell}^{+}}{{\mathit \nu}}$ )/A( ${{\mathit K}^{0}}$ $\rightarrow$ ${{\mathit \pi}^{-}}{{\mathit \ell}^{+}}{{\mathit \nu}}$ ) = A($\Delta \mathit S=−\Delta \mathit Q)/A(\Delta \mathit S=\Delta \mathit Q$)

Decay Modes ▸  Expand all decays
Mode   Fraction ($\Gamma_i$ / $\Gamma$) Scale Factor/ Conf. Level P(MeV/c)   ▸ Semileptonic modes ▸ Hadronic modes, including Charge conjugation${\times }$Parity Violating ($\mathit CPV$) modes ▸ Semileptonic modes with photons ▸ Hadronic modes with photons or ${{\mathit \ell}}{{\overline{\mathit \ell}}}$ pairs ▸ Other modes with photons or ${{\mathit \ell}}{{\overline{\mathit \ell}}}$ pairs ▸ Charge conjugation ${\times }$ Parity ($\mathit CP$) or Lepton Family number ($\mathit LF$) violating modes, or $\Delta \mathit S$ = 1 weak neutral current ($\mathit S1$) modes ▸ Lorentz invariance violating modes
FOOTNOTES

Constrained Fit information