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

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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:

BARBOSA 2000 PR D61 031101 Measurement of the ${{\overline{\mathit \Sigma}}^{-}}$ Lifetime and Direct Comparison with the ${{\mathit \Sigma}^{+}}$ Lifetime MARRAFFINO 1980 PR D21 2501 New Measurement of ${{\mathit \Sigma}}$ Decay Properties and a Test of the ${{\mathit \Delta}}\mathit I={1\over 2}$ Rule CONFORTO 1976 NP B105 189 ${{\mathit K}^{-}}{{\mathit p}}$ Reactions from 0.960 to 1.355 ${\mathrm {GeV/}}\mathit c$ Involving Two Body Final States EISELE 1970 ZPHY 238 372 Measurement of the ${{\mathit \Sigma}^{\pm}}$ Lifetimes BARLOUTAUD 1969 NP B14 153 Measurement of the Lifetimes of the ${{\mathit \Sigma}^{\pm}}$ Hyperons and of the Branching Ratio of the Non Leptonic ${{\mathit \Sigma}^{+}}$ Decay CHANG 1966 PR 151 1081 ${{\mathit \Sigma}^{\pm}}$ Lifetime and the Branching Ratio Br(${{\mathit \Sigma}^{+}}$) = ( ${{\mathit \Sigma}^{+}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit n}}$ )/( ${{\mathit \Sigma}^{+}}$ $\rightarrow$ ) Also Thesis Nevis 145 Lifetime of ${{\mathit \Sigma}^{+}}$ and the Branching Ratios for Non-Leptonic ${{\mathit \Sigma}^{+}}$ Decays