The fit uses ${{\mathit \Sigma}^{+}}$, ${{\mathit \Sigma}^{0}}$, ${{\mathit \Sigma}^{-}}$, and ${{\mathit \Lambda}}$ mass and mass-difference measurements.
1BOHM 1972 is updated with our 1973 ${{\mathit K}^{-}}$, ${{\mathit \pi}^{-}}$, and ${{\mathit \pi}^{0}}$ masses (Reviews of Modern Physics 45 S1 (1973)).
2
These masses have been raised 30 keV to take into account a 46 keV increase in the proton mass and a 21 keV decrease in the ${{\mathit \pi}^{0}}$ mass (note added 1967 edition, Reviews of Modern Physics 39 1 (1967)).
${{\mathit \Sigma}^{+}}$ mass (MeV)
References:
BOHM
1972
NP B48 1
Determination of the Masses of the Charged ${{\mathit \Sigma}}$ Hyperons
HYMAN
1967
PL 25B 376
Mass Measurements Using the Range Energy Relation in a Helium Bubble Chamber
SCHMIDT
1965
PR 140 B1328
Precise Hyperon Masses
BHOWMIK
1964
NP 53 22
The Lifetimes of Charged ${{\mathit \Sigma}}$ Hyperons
BARKAS
1963
PRL 11 26
Resolution of the ${{\mathit \Sigma}^{-}}$-Mass Anomaly
