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${{\mathit K}^{\pm}}$ MEAN LIFE

INSPIRE   PDGID:

S010T

VALUE ($ 10^{-8} $ s) EVTS DOCUMENT ID TECN CHG  COMMENT $\bf{ 1.2380 \pm0.0020}$ OUR FIT  Error includes scale factor of 1.8. $\bf{ 1.2379 \pm0.0021}$ OUR AVERAGE  Error includes scale factor of 1.9.  See the ideogram below. $1.2347$ $\pm0.0030$ 15M 1 AMBROSINO 2008 KLOE $\pm{}$ ${{\mathit \phi}}$ $\rightarrow$ ${{\mathit K}^{+}}{{\mathit K}^{-}}$ $1.2451$ $\pm0.0030$ 250k KOPTEV 1995 CNTR ${{\mathit K}}$ at rest, U target $1.2368$ $\pm0.0041$ 150k KOPTEV 1995 CNTR ${{\mathit K}}$ at rest, Cu target $1.2380$ $\pm0.0016$ 3M OTT 1971 CNTR + ${{\mathit K}}$ at rest $1.2272$ $\pm0.0036$ LOBKOWICZ 1969 CNTR + ${{\mathit K}}$ in flight $1.2443$ $\pm0.0038$ FITCH 1965 B CNTR + ${{\mathit K}}$ at rest • • We do not use the following data for averages, fits, limits, etc. • • $1.2415$ $\pm0.0024$ 400k 2 KOPTEV 1995 CNTR ${{\mathit K}}$ at rest $1.221$ $\pm0.011$ FORD 1967 CNTR $\pm{}$ $1.231$ $\pm0.011$ BOYARSKI 1962 CNTR + 1  Result obtained by averaging the decay length and decay time analyses taking correlations into account. 2  KOPTEV 1995 report this weighted average of their U-target and Cu-target results, where they have weighted by 1/$\sigma $ rather than 1/$\sigma {}^{2}$.

${{\mathit K}^{\pm}}$ mean life (${10^{-8}}$s)

References:

AMBROSINO 2008 JHEP 0801 073 Measurement of the Charged Kaon Lifetime with the KLOE Detector KOPTEV 1995 JETPL 61 877 Measurement of ${{\mathit \pi}^{\pm}}$ and ${{\mathit K}^{\pm}}$ Lifetime OTT 1971 PR D3 52 Precise Measurement of the ${{\mathit K}^{+}}$ Lifetime LOBKOWICZ 1969 PR 185 1676 Precise Measurement of the ${{\mathit K}^{+}}/{{\mathit K}^{-}}$ Lifetime Ratio Also PRL 17 548 Precise Measurement of the ${{\mathit K}^{+}}/{{\mathit K}^{-}}$ and ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$ Lifetime Ratios FORD 1967 PRL 18 1214 Comparison of the ${{\mathit K}^{+}}$ and ${{\mathit K}^{-}}$ Decay Rates into the ${{\mathit \tau}}$ and ${{\mathit K}_{{\mu2}}}$ Modes FITCH 1965B PR 140 B1088 Study of the ${{\mathit K}^{+}}$ Decay Probability BOYARSKI 1962 PR 128 2398 Study of the ${{\mathit K}^{+}}$ Decay

see fit info