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${{\mathit K}^{\pm}}$ MASS
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$493.677 \pm0.016$ MeV (S = 2.8)
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${\mathit m}_{{{\mathit K}^{+}}}{\mathit m}_{{{\mathit K}^{-}}}$
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$-0.03 \pm0.09$ MeV
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${{\mathit K}^{\pm}}$ MEAN LIFE
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$(1.2380 \pm0.0020) \times 10^{-8}$ s (S = 1.8)
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$({\mathit \tau}_{{{\mathit K}^{+}}}{\mathit \tau}_{{{\mathit K}^{-}}})/{\mathit \tau}_{\mathrm {average}}$
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$0.0010 \pm0.0009$ (S = 1.2)
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${{\mathit K}^{\pm}}$ CHARGE RADIUS
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$0.560 \pm0.031$ fm
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${{\mathit K}^{+}}$ LONGITUDINAL POLARIZATION OF EMITTED ${{\mathit \mu}^{+}}$
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$<-0.990$ CL=90.0%
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A$_{FB}({{\mathit K}}{}^{\pm{}}_{{{\mathit \pi}} {{\mathit \mu}} {{\mathit \mu}} }$) = ${\Gamma\mathrm {(cos({{\mathit \theta}}_{ {{\mathit K}} {{\mathit \mu}} })>0)}−\Gamma\mathrm {(cos({{\mathit \theta}}_{ {{\mathit K}} {{\mathit \mu}} })<0)}\over \Gamma\mathrm {(cos({{\mathit \theta}}_{ {{\mathit K}} {{\mathit \mu}} })>0)}+\Gamma\mathrm {(cos({{\mathit \theta}}_{ {{\mathit K}} {{\mathit \mu}} })<0)}}$
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$<0.023$ CL=90.0%
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