# $({\boldsymbol \tau}_{{{\boldsymbol K}^{+}}}–{\boldsymbol \tau}_{{{\boldsymbol K}^{-}}})/{\boldsymbol \tau}_{\mathrm {average}}$ INSPIRE search

This quantity is a measure of $\mathit CPT$ invariance in weak interactions.
VALUE (%) DOCUMENT ID TECN
$\bf{ 0.10 \pm0.09 }$ OUR AVERAGE  Error includes scale factor of 1.2.
$-0.4$ $\pm0.4$
 2008
KLOE
$0.090$ $\pm0.078$
 1969
CNTR
$0.47$ $\pm0.30$
 1967
CNTR
Conservation Laws:
 $\mathit CPT$ INVARIANCE
References:
 AMBROSINO 2008
JHEP 0801 073 Measurement of the Charged Kaon Lifetime with the KLOE Detector
 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