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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 PDGID:

M174

**${{\mathit K}_{{{0}}}^{*}{(700)}}$**

$I(J^P)$ = $1/2(0^{+})$

also known as ${{\mathit \kappa}}$; was ${{\mathit K}_{{{0}}}^{*}{(800)}}$

See related review:

Scalar Mesons below 1 GeV

${{\mathit K}_{{{0}}}^{*}{(700)}}$ T-Matrix Pole $\sqrt {s }$

$(630 - 730) - i (260 - 340)$ MeV

${{\mathit K}_{{{0}}}^{*}{(700)}}$ Breit-Wigner Mass

$838$ $\pm11$ MeV

${{\mathit K}_{{{0}}}^{*}{(700)}}$ Breit-Wigner Width

$463$ $\pm27$ MeV

${{\mathit K}_{{{0}}}^{*}{(700)}}$ DECAY MODES

Mode

Fraction ($\Gamma_i$ / $\Gamma$)

Scale Factor/
Conf. Level

P(MeV/c)

$\Gamma_{1}$

${{\mathit K}}{{\mathit \pi}}$

$\sim100$ $\%$

250

Except where otherwise noted, content of the 2025 Review of Particle Physics is licensed under a Creative Commons Attribution 4.0 International (CC BY 4.0) license. The publication of the Review of Particle Physics is supported by US DOE, MEXT (Japan), INFN (Italy) and CERN. Individual collaborators receive support for their PDG activities from their respective institutes or funding agencies. © 2025. See LBNL disclaimers.

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${{\mathit K}_{{{0}}}^{*}{(700)}}$

**${{\mathit K}_{{{0}}}^{*}{(700)}}$**