$\vert{}{\mathit m}_{{{\mathit K}^{0}}}–{\mathit m}_{{{\overline{\mathit K}}^{0}}}\vert{}/{\mathit m}_{\mathrm {average}}$

INSPIRE   PDGID:
S011DMM
A test of $\mathit CPT$ invariance. “Our Evaluation” is described in the “Tests of Conservation Laws” section. It assumes $\mathit CPT$ invariance in the decay and neglects some contributions from decay channels other than ${{\mathit \pi}}{{\mathit \pi}}$ .
VALUE CL% DOCUMENT ID TECN
$\bf{<6 \times 10^{-19}}$ 90
PDG
2012
• • We do not use the following data for averages, fits, limits, etc. • •
$(-3 \pm4) \times 10^{-18}$ 1
ANGELOPOULOS
1999B
 RVUE
1  ANGELOPOULOS 1999B assumes only unitarity and combines CPLEAR and other results.
Conservation Laws:
$\mathit CPT$ INVARIANCE
References:
PDG 2012
PR D86 010001 PDG 2012
ANGELOPOULOS 1999B
PL B471 332 ${{\overline{\mathit K}}^{0}}$ $−$ ${{\mathit K}^{0}}$ Mass and Decay Width Differences: CPLEAR Evaluation