# ${{\boldsymbol K}^{\pm}}$ MEAN LIFE INSPIRE search

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.
$1.2347$ $\pm0.0030$ 15M 1
 2008
KLOE $\pm{}$ ${{\mathit \phi}}$ $\rightarrow$ ${{\mathit K}^{+}}{{\mathit K}^{-}}$
$1.2451$ $\pm0.0030$ 250k
 1995
CNTR ${{\mathit K}}$ at rest, U target
$1.2368$ $\pm0.0041$ 150k
 1995
CNTR ${{\mathit K}}$ at rest, Cu target
$1.2380$ $\pm0.0016$ 3M
 1971
CNTR + ${{\mathit K}}$ at rest
$1.2272$ $\pm0.0036$
 1969
CNTR + ${{\mathit K}}$ in flight
$1.2443$ $\pm0.0038$
 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
 1995
CNTR ${{\mathit K}}$ at rest
$1.221$ $\pm0.011$
 1967
CNTR $\pm{}$
$1.231$ $\pm0.011$
 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
 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