${{\boldsymbol \mu}}$ MEAN LIFE $\tau $ INSPIRE search

Measurements with an error $>$ $0.001 \times 10^{-6}~$s have been omitted.
VALUE ($ 10^{-6} $ s) DOCUMENT ID TECN CHG  COMMENT
$\bf{ 2.1969811 \pm0.0000022}$ OUR AVERAGE
$2.1969803$ $\pm0.0000021$ $\pm0.0000007$ 1
TISHCHENKO
2013
CNTR + Surface ${{\mathit \mu}^{+}}$ at PSI
$2.197083$ $\pm0.000032$ $\pm0.000015$
BARCZYK
2008
CNTR + Muons from ${{\mathit \pi}^{+}}$ decay at rest
$2.197013$ $\pm0.000021$ $\pm0.000011$
CHITWOOD
2007
CNTR + Surface ${{\mathit \mu}^{+}}$ at PSI
$2.197078$ $\pm0.000073$
BARDIN
1984
CNTR +
$2.197025$ $\pm0.000155$
BARDIN
1984
CNTR -
$2.19695$ $\pm0.00006$
GIOVANETTI
1984
CNTR +
$2.19711$ $\pm0.00008$
BALANDIN
1974
CNTR +
$2.1973$ $\pm0.0003$
DUCLOS
1973
CNTR +
• • • We do not use the following data for averages, fits, limits, etc. • • •
$2.1969803$ $\pm0.0000022$
WEBBER
2011
CNTR + Surface ${{\mathit \mu}^{+}}$ at PSI
1  TISHCHENKO 2013 uses $1.6 \times 10^{12}{{\mathit \mu}^{+}}$ events and supersedes WEBBER 2011 .
  References:
TISHCHENKO 2013
PR D87 052003 Detailed Report of the MuLan Measurement of the Positive Muon Lifetime and Determination of the Fermi Constant
WEBBER 2011
PRL 106 041803 Measurement of the Positive Muon Lifetime and Determination of the Fermi Constant to Part-per-Million Precision
BARCZYK 2008
PL B663 172 Measurement of the Fermi constant by FAST
CHITWOOD 2007
PRL 99 032001 Improved Measurement of the Positive-Muon Lifetime and Determination of the Fermi Constant
BARDIN 1984
PL 137B 135 A New Measurement of the Positive Muon Lifetime
GIOVANETTI 1984
PR D29 343 Mean Life of the Positive Muon
BALANDIN 1974
JETP 40 811 Measurement of the Positive Muon's Lifetime
DUCLOS 1973
PL 47B 491 New Measurement of the Muon Lifetime