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:
M028

${{\mathit K}_{{{1}}}{(1270)}}$

$I(J^P)$ = $1/2(1^{+})$ 
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${{\mathit K}_{{{1}}}{(1270)}}$ MASS $1253$ $\pm7$ MeV (S = 2.2)
 
PRODUCED BY ${{\mathit K}^{-}}$, BACKWARD SCATTERING, HYPERON EXCHANGE $1275$ $\pm10$ MeV 
 
PRODUCED BY ${{\mathit K}}$ BEAMS $1270$ $\pm10$ MeV 
 
PRODUCED BY BEAMS OTHER THAN ${{\mathit K}}$ MESONS $1248$ $\pm4$ MeV 
 
PRODUCED IN ${{\mathit \tau}}$ LEPTON DECAYS $1250$ $\pm50$ MeV 
 
${{\mathit K}_{{{1}}}{(1270)}}$ WIDTH [1] $101$ $\pm12$ MeV (S = 2.2)
 
PRODUCED BY ${{\mathit K}^{-}}$, BACKWARD SCATTERING, HYPERON EXCHANGE $75$ $\pm15$ MeV 
 
PRODUCED BY ${{\mathit K}}$ BEAMS $90$ $\pm8$ MeV 
 
PRODUCED BY BEAMS OTHER THAN ${{\mathit K}}$ MESONS $120$ $\pm8$ MeV 
 
PRODUCED IN ${{\mathit \tau}}$ LEPTON DECAYS $260^{+120}_{-110}$ MeV 
 
▸  ${{\mathit K}_{{{1}}}{(1270)}}$ BRANCHING RATIOS
Mode  
Fraction ($\Gamma_i$ / $\Gamma$) Scale Factor/
Conf. Level		 P(MeV/c)  
$\Gamma_{1}$ ${{\mathit K}}{{\mathit \rho}}$ ($38$ $\pm13$ ) $\%$ S=2.2  -1
 
$\Gamma_{2}$ ${{\mathit K}_{{{0}}}^{*}{(1430)}}{{\mathit \pi}}$ ($28$ $\pm4$ ) $\%$ -1
 
$\Gamma_{3}$ ${{\mathit K}^{*}{(892)}}{{\mathit \pi}}$ ($21$ $\pm10$ ) $\%$ S=2.2  286
 
$\Gamma_{4}$ ${{\mathit K}}{{\mathit \omega}}$ ($11.0$ $\pm2.0$ ) $\%$ -1
 
$\Gamma_{5}$ ${{\mathit K}}{{\mathit f}_{{{0}}}{(1370)}}$ ($3.0$ $\pm2.0$ ) $\%$ -1
 
$\Gamma_{6}$ ${{\mathit \gamma}}{{\mathit K}^{0}}$ seen 528
 
[1] Our estimate. See the Particle Listings for details.