# ${{\boldsymbol \Lambda}}$ MASS INSPIRE search

The fit uses ${{\mathit \Lambda}}$, ${{\mathit \Sigma}^{+}}$, ${{\mathit \Sigma}^{0}}$, ${{\mathit \Sigma}^{-}}$ mass and mass-difference measurements.
VALUE (MeV) EVTS DOCUMENT ID TECN  COMMENT
$\bf{ 1115.683 \pm0.006}$ OUR FIT
$\bf{ 1115.683 \pm0.006}$ OUR AVERAGE
$1115.678$ $\pm0.006$ $\pm0.006$ 20k
 1994
SPEC ${{\mathit p}}{{\mathit p}}$ $27.5$ ${\mathrm {GeV/}}\mathit c$
$1115.690$ $\pm0.008$ $\pm0.006$ 18k 1
 1994
SPEC ${{\mathit p}}{{\mathit p}}$ $27.5$ ${\mathrm {GeV/}}\mathit c$
• • • We do not use the following data for averages, fits, limits, etc. • • •
$1115.59$ $\pm0.08$ 935
 1972
HEBC
$1115.39$ $\pm0.12$ 195
 1967
EMUL
$1115.6$ $\pm0.4$
 1966
HBC
$1115.65$ $\pm0.07$ 488 2
 1965
HBC
$1115.44$ $\pm0.12$ 3
 1963
RVUE
1  We assume $\mathit CPT$ invariance: this is the ${{\overline{\mathit \Lambda}}}$ mass as measured by HARTOUNI 1994 . See below for the fractional mass difference, testing $\mathit CPT$.
2  The SCHMIDT 1965 masses have been reevaluated using our April 1973 proton and ${{\mathit K}^{\pm}}$ and ${{\mathit \pi}^{\pm}}$ masses. P. Schmidt, private communication (1974).
3  The mass has been raised 35 keV to take into account a 46 keV increase in the proton mass and an 11 keV decrease in the ${{\mathit \pi}^{\pm}}$ mass (note added Reviews of Modern Physics 39 1 (1967)).
References:
 HARTOUNI 1994
PRL 72 1322 Precise Measurement of the ${{\mathit \Lambda}^{0}}$ and ${{\overline{\mathit \Lambda}}^{0}}$ Masses and a Test of $\mathit CPT$ Invariance
 HYMAN 1972
PR D5 1063 Measurement of ${{\mathit \Lambda}^{0}}$ Mass
 MAYEUR 1967
U.Libr.Brux.Bul. 32 A Determination of the Mass of the ${{\mathit \Lambda}}$ Hyperon
 LONDON 1966
PR 143 1034 ${{\mathit K}^{-}}{{\mathit p}}$ Interaction at 2.24 BeV
 SCHMIDT 1965
PR 140 B1328 Precise Hyperon Masses
 BHOWMIK 1963
NC 28 1494 The $\mathit Q_{{{\mathit \Lambda}}}$ $−$ Value for Hyperfragment Binding Energies