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

INSPIRE search

${{\boldsymbol K}{(1630)}}$ $I(J^P)$ = $1/2(?^{?})$

Seen as a narrow peak, compatible with the experimental resolution, in the invariant mass of the ${{\mathit K}_S^0}$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$ system produced in ${{\mathit \pi}^{-}}{{\mathit p}}$ interactions at high momentum transfers.

${{\mathit K}{(1630)}}$ MASS

$1629 \pm7$ MeV

${{\mathit K}{(1630)}}$ WIDTH

$16 {}^{+19}_{-16}$ MeV

Decay Modes

$\Gamma_{1}$

${{\mathit K}_S^0}$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$

709