# ${{\boldsymbol \Sigma}^{+}}$ MEAN LIFE INSPIRE search

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
$0.8038$ $\pm0.0040$ $\pm0.0014$
 2000
E761 hyperons, 375 GeV
$0.8043$ $\pm0.0080$ $\pm0.0014$ 1
 2000
E761 hyperons, 375 GeV
$0.798$ $\pm0.005$ 30k
 1980
HBC ${{\mathit K}^{-}}{{\mathit p}}$ 0.42$-$0.5 ${\mathrm {GeV/}}\mathit c$
$0.807$ $\pm0.013$ 5719
 1976
HBC ${{\mathit K}^{-}}{{\mathit p}}$ 1$-$1.4 ${\mathrm {GeV/}}\mathit c$
$0.795$ $\pm0.010$ 20k
 1970
HBC ${{\mathit K}^{-}}{{\mathit p}}$ at rest
$0.803$ $\pm0.008$ 10664
 1969
HBC ${{\mathit K}^{-}}{{\mathit p}}$ 0.4$-$1.2 ${\mathrm {GeV/}}\mathit c$
$0.83$ $\pm0.032$ 1300 2
 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(${{\mathit \Sigma}^{+}}$) = ( ${{\mathit \Sigma}^{+}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit n}}$ )/( ${{\mathit \Sigma}^{+}}$ $\rightarrow$ )