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${{\mathit \Xi}^{0}}$ MEAN LIFE

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S023T

VALUE ($ 10^{-10} $ s) EVTS DOCUMENT ID TECN  COMMENT $\bf{ 2.90 \pm0.09}$ OUR AVERAGE $2.83$ $\pm0.16$ 6300 1 ZECH 97   SPEC Neutral hyperon beam $2.88$ ${}^{+0.21}_{-0.19}$ 652 BALTAY 97   HBC 1.75 ${\mathrm {GeV/}}\mathit c$ ${{\mathit K}^{-}}{{\mathit p}}$ $2.90$ ${}^{+0.32}_{-0.27}$ 157 2 MAYEUR 97   HLBC 2.1 ${\mathrm {GeV/}}\mathit c$ ${{\mathit K}^{-}}$ $3.07$ ${}^{+0.22}_{-0.20}$ 340 DAUBER 96   HBC $3.0$ $\pm0.5$ 80 PJERROU 96 B   HBC $2.5$ ${}^{+0.4}_{-0.3}$ 101 HUBBARD 96   HBC $3.9$ ${}^{+1.4}_{-0.8}$ 24 JAUNEAU 96   FBC • • We do not use the following data for averages, fits, limits, etc. • • $3.5$ ${}^{+1.0}_{-0.8}$ 45 CARMONY 96 B   HBC See PJERROU 1965B 1  The ZECH 1977 result is ${\mathit \tau}_{{{\mathit \Xi}^{0}}}$ = $\lbrack{}2.77–({\mathit \tau}_{{{\mathit \Lambda}}}–2.69)\rbrack{}{\times }10^{-10}$ s, in which we use ${\mathit \tau}_{{{\mathit \Lambda}}}$ = $2.63 \times 10^{-10}$ s. 2  The MAYEUR 1972 value is modified by the erratum.

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