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${{\mathit \Lambda}}$ MASS

INSPIRE   PDGID:

S018M

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 HARTOUNI 1994 SPEC ${{\mathit p}}{{\mathit p}}$ $27.5$ ${\mathrm {GeV/}}\mathit c$ $1115.690$ $\pm0.008$ $\pm0.006$ 18k 1 HARTOUNI 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 HYMAN 1972 HEBC $1115.39$ $\pm0.12$ 195 MAYEUR 1967 EMUL $1115.6$ $\pm0.4$ LONDON 1966 HBC $1115.65$ $\pm0.07$ 488 2 SCHMIDT 1965 HBC $1115.44$ $\pm0.12$ 3 BHOWMIK 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