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${{\mathit \Lambda}}$ MEAN LIFE

Measurements with an error ${}\geq{}$ $0.1 \times 10^{-10}$ s have been omitted altogether, and only the latest high-statistics measurements are used for the average.

INSPIRE   PDGID:

S018T

VALUE ($ 10^{-10} $ s) EVTS DOCUMENT ID TECN  COMMENT $\bf{ 2.632 \pm0.020}$ OUR AVERAGE  Error includes scale factor of 1.6.  See the ideogram below. $2.69$ $\pm0.03$ 53k ZECH 1977 SPEC Neutral hyperon beam $2.611$ $\pm0.020$ 34k CLAYTON 1975 HBC 0.96$-$1.4 ${\mathrm {GeV/}}\mathit c$ ${{\mathit K}^{-}}{{\mathit p}}$ $2.626$ $\pm0.020$ 36k POULARD 1973 HBC 0.4$-$2.3 ${\mathrm {GeV/}}\mathit c$ ${{\mathit K}^{-}}{{\mathit p}}$ • • We do not use the following data for averages, fits, limits, etc. • • $2.69$ $\pm0.05$ 6582 ALTHOFF 1973 B OSPK ${{\mathit \pi}^{+}}$ ${{\mathit n}}$ $\rightarrow$ ${{\mathit \Lambda}}{{\mathit K}^{+}}$ $2.54$ $\pm0.04$ 4572 BALTAY 1971 B HBC ${{\mathit K}^{-}}{{\mathit p}}$ at rest $2.535$ $\pm0.035$ 8342 GRIMM 1968 HBC $2.47$ $\pm0.08$ 2600 HEPP 1968 HBC $2.35$ $\pm0.09$ 916 BURAN 1966 HLBC $2.452$ ${}^{+0.056}_{-0.054}$ 2213 ENGELMANN 1966 HBC $2.59$ $\pm0.09$ 794 HUBBARD 1964 HBC $2.59$ $\pm0.07$ 1378 SCHWARTZ 1964 HBC $2.36$ $\pm0.06$ 2239 BLOCK 1963 HEBC

${{\mathit \Lambda}}$ mean life (${10^{-10}}$s)

References:

ZECH 1977 NP B124 413 A Measurement of the Lifetimes of ${{\mathit \Xi}^{0}}$ and ${{\mathit \Lambda}}$ Hyperons CLAYTON 1975 NP B95 130 A High Statistics Determination of the ${{\mathit \Lambda}^{0}}$ Mean Lifetime ALTHOFF 1973B NP B66 29 New Determination of the ${{\mathit \Lambda}^{0}}$ Mean Life POULARD 1973 PL 46B 135 New Measurement of the ${{\mathit \Lambda}}$ Lifetime BALTAY 1971B PR D4 670 Precision Measurement of the Lifetime and Decay Branching Ratio of the ${{\mathit \Lambda}^{0}}$ Hyperon GRIMM 1968 NC 54A 187 A New Determination of the ${{\mathit \Lambda}}$ Lifetime HEPP 1968 ZPHY 214 71 A New Determination of the Capture Ratio $_{c}$ = ${ {{\mathit \Sigma}^{-}} {{\mathit p}} \rightarrow {{\mathit \Sigma}^{0}} {{\mathit n}} \over ( {{\mathit \Sigma}^{-}} {{\mathit p}} \rightarrow {{\mathit \Sigma}^{0}} {{\mathit n}} )+( {{\mathit \Sigma}^{-}} {{\mathit p}} \rightarrow {{\mathit \Lambda}} {{\mathit n}} )}$, the ${{\mathit \Lambda}}$-Lifetime and ${{\mathit \Sigma}^{-}}{{\mathit \Lambda}}$ Mass Difference BURAN 1966 PL 20 318 Study of the ${{\mathit \Lambda}}{{\mathit p}}$ Effective Mass Spectrum and the ${{\mathit \Lambda}}$ Lifetime ENGELMANN 1966 NC 45A 1038 A Lifetime Measurement in a Low-Momentum ${{\mathit \Lambda}}$ Beam HUBBARD 1964 PR 135 B183 Lifetimes of the ${{\mathit \Xi}^{-}}$ and ${{\mathit \Xi}^{0}}$ Hyperons SCHWARTZ 1964 Thesis UCRL 11360 Associated Production from 1.5 to 2.4 BeV/$\mathit c$ BLOCK 1963 PR 130 766 Lifetime of the ${{\mathit \Lambda}}$ Hyperon

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