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

Measurements with an error $>$ $0.02 \times 10^{-8}~$s have been omitted.
VALUE ($10^{-8}$ s) DOCUMENT ID TECN CHG  COMMENT
$\bf{ 2.6033 \pm0.0005}$ OUR AVERAGE  Error includes scale factor of 1.2.
$2.60361$ $\pm0.00052$ 1
 1995
SPEC + Surface ${{\mathit \mu}^{+}}$'s
$2.60231$ $\pm0.00050$ $\pm0.00084$
 1995
SPEC + Surface ${{\mathit \mu}^{+}}$'s
$2.609$ $\pm0.008$
 1973
CNTR +
$2.602$ $\pm0.004$
 1971
CNTR $\pm{}$
$2.604$ $\pm0.005$
 1967
CNTR +
$2.602$ $\pm0.004$
 1965
CNTR +
• • • We do not use the following data for averages, fits, limits, etc. • • •
$2.640$ $\pm0.008$ 2
 1966
CNTR +
1  KOPTEV 1995 combines the statistical and systematic errors; the statistical error dominates.
2  Systematic errors in the calibration of this experiment are discussed by NORDBERG 1967 .
References:
 KOPTEV 1995
JETPL 61 877 Measurement of ${{\mathit \pi}^{\pm}}$ and ${{\mathit K}^{\pm}}$ Lifetime
 NUMAO 1995
PR D52 4855 A New ${{\mathit \pi}^{+}}$ Lifetime Measurement
 DUNAITSEV 1973
SJNP 16 292 On Measuring the Mean Lifetime of ${{\mathit \pi}^{+}}$ Meson with a High Speed Multiray Scope
 AYRES 1971
PR D3 1051 Measurements of the Lifetimes of Positive and Negative Pions
 NORDBERG 1967
PL 24B 594 Remeasurement of the ${{\mathit \pi}^{+}}$ Lifetime
 KINSEY 1966
PR 144 1132 Measurement of the Lifetime of the Positive Pion
 ECKHAUSE 1965
PL 19 348 A New Measurement of the Lifetime of the Positive Pion