pdgLive Home   >   Baryon Summary Table   >   ${{\mathit \Sigma}^{+}}$   >   ${{\mathit \Sigma}^{+}}$ MEAN LIFE

${{\mathit \Sigma}^{+}}$ MEAN LIFE

INSPIRE   JSON  (beta) PDGID:

S019T

Measurements with fewer than 1000 events have been omitted.

VALUE ($ 10^{-10} $ s) EVTS DOCUMENT ID TECN  COMMENT $\bf{ 0.8018 \pm0.0026}$ OUR AVERAGE $0.8038$ $\pm0.0040$ $\pm0.0014$ BARBOSA 2000 E761 hyperons, 375 GeV $0.8043$ $\pm0.0080$ $\pm0.0014$ 1 BARBOSA 2000 E761 hyperons, 375 GeV $0.798$ $\pm0.005$ 30k MARRAFFINO 1980 HBC ${{\mathit K}^{-}}{{\mathit p}}$ 0.42$-$0.5 ${\mathrm {GeV/}}\mathit c$ $0.807$ $\pm0.013$ 5719 CONFORTO 1976 HBC ${{\mathit K}^{-}}{{\mathit p}}$ 1$-$1.4 ${\mathrm {GeV/}}\mathit c$ $0.795$ $\pm0.010$ 20k EISELE 1970 HBC ${{\mathit K}^{-}}{{\mathit p}}$ at rest $0.803$ $\pm0.008$ 10664 BARLOUTAUD 1969 HBC ${{\mathit K}^{-}}{{\mathit p}}$ 0.4$-$1.2 ${\mathrm {GeV/}}\mathit c$ $0.83$ $\pm0.032$ 1300 2 CHANG 1966 HBC 1  This is a measurement of the ${{\overline{\mathit \Sigma}}^{-}}$ lifetime. Here we assume $\mathit CPT$ invariance; see below for the fractional ${{\mathit \Sigma}^{+}}-{{\overline{\mathit \Sigma}}^{-}}$ lifetime difference obtained by BARBOSA 2000. 2  We have increased the CHANG 1966 error of 0.018; see our 1970 edition, Reviews of Modern Physics 42 87 (1970).

References