# ${{\boldsymbol K}^{0}}$ MASS INSPIRE search

VALUE (MeV) EVTS DOCUMENT ID TECN  COMMENT
$\bf{ 497.611 \pm0.013}$ OUR FIT  Error includes scale factor of 1.2.
$\bf{ 497.611 \pm0.013}$ OUR AVERAGE  Error includes scale factor of 1.2.
$497.607$ $\pm0.007$ $\pm0.015$ 261k 1
 2014
${{\mathit \psi}{(2S)}}$ $\rightarrow$ ${{\mathit K}_S^0}$ ${{\mathit X}}$
$497.583$ $\pm0.005$ $\pm0.020$ 35k
 2007 B
KLOE ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit K}_L^0}$ ${{\mathit K}_S^0}$
$497.625$ $\pm0.001$ $\pm0.031$ 655k
 2002
NA48 ${{\mathit K}_L^0}$ beam
$497.661$ $\pm0.033$ 3713
 1987 B
CMD ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit K}_L^0}$ ${{\mathit K}_S^0}$
$497.742$ $\pm0.085$ 780
 1985 B
CMD ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit K}_L^0}$ ${{\mathit K}_S^0}$
• • • We do not use the following data for averages, fits, limits, etc. • • •
$497.44$ $\pm0.50$
 1967
OSPK
$498.9$ $\pm0.5$ 4500
 1966
HBC ${{\mathit K}^{0}}$ from ${{\overline{\mathit p}}}{{\mathit p}}$
$497.44$ $\pm0.33$ 2223
 1965 B
HBC ${{\mathit K}^{0}}$ from ${{\overline{\mathit p}}}{{\mathit p}}$
$498.1$ $\pm0.4$
 1964
OSPK
1  Obtained by analyzing CLEO-c data but not authored by the CLEO Collaboration.
References:
PR D89 031501 High Precision Measurement of the Masses of the ${{\mathit D}^{0}}$ and ${{\mathit K}_S^0}$ mesons
 AMBROSINO 2007B
JHEP 0712 073 Precise Measurements of the ${{\mathit \eta}}$ Meson and the Neutral Kaon Masses with the KLOE Detector
 LAI 2002
PL B533 196 New Measurements of the ${{\mathit \eta}}$ and ${{\mathit K}^{0}}$ Masses
 BARKOV 1987B
SJNP 46 630 The Precision Neutral Kaon Mass Measurement
 BARKOV 1985B
JETPL 42 138 Measurement of the Neutral Kaon Mass
 FITCH 1967
PR 164 1711 Studies of ${{\mathit K}_{{2}}^{0}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$ Decay and Interference
 BALTAY 1966
PR 142 932 Study of Antiproton Proton Annihilations into ${{\mathit K}}$ and ${{\mathit \pi}}$ Mesons at 3.7 ${\mathrm {GeV/}}\mathit c$
 KIM 1965B
PR 140 B1334 Measurement of the ${{\mathit K}^{0}}$ Mass and the ${{\mathit K}^{0}}{{\mathit K}^{-}}$ Mass Difference
 CHRISTENSON 1964
PRL 13 138 Evidence for the 2${{\mathit \pi}}$ Decay of the ${{\mathit K}_L^0}$ Meson