# ${{\boldsymbol \Xi}_{{b}}}$ MEAN LIFE

OUR EVALUATION'' is an average using rescaled values of the data listed below. The average and rescaling were performed by the Heavy Flavor Averaging Group (HFLAV) and are described at http://www.slac.stanford.edu/xorg/hflav/. The averaging/rescaling procedure takes into account correlations between the measurements and asymmetric lifetime errors.

# ${{\boldsymbol \Xi}_{{b}}}$ MEAN LIFE INSPIRE search

VALUE ($10^{-12}$ s) DOCUMENT ID TECN  COMMENT
• • • We do not use the following data for averages, fits, limits, etc. • • •
$1.48$ ${}^{+0.40}_{-0.31}$ $\pm0.12$ 1
 2005 C
DLPH ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit Z}^{0}}$
$1.35$ ${}^{+0.37}_{-0.28}$ ${}^{+0.15}_{-0.17}$ 2
 1996 T
ALEP ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit Z}}$
$1.5$ ${}^{+0.7}_{-0.4}$ $\pm0.3$ 3
 1995 V
DLPH Repl. by ABDALLAH 2005C
1  Used the decay length of ${{\mathit \Xi}^{-}}$ accompanied by a lepton of the same sign.
2  Excess ${{\mathit \Xi}^{-}}{{\mathit \ell}^{-}}$ , impact parameters.
3  Excess ${{\mathit \Xi}^{-}}{{\mathit \ell}^{-}}$ , decay lengths.
References:
 ABDALLAH 2005C
EPJ C44 299 Production of ${{\mathit \Xi}_{{c}}^{0}}$ and ${{\mathit \Xi}_{{b}}}$ in ${{\mathit Z}}$ Decays and Lifetime Measurement of ${{\mathit \Xi}_{{b}}}$
 BUSKULIC 1996T
PL B384 449 Strange ${{\mathit b}}$ Baryon Production and Lifetime in ${{\mathit Z}}$ Decays
 ABREU 1995V
ZPHY C68 541 Production of Strange ${{\mathit B}}$ Baryons Decaying into ${{\mathit \Xi}^{\pm}}−{{\mathit \ell}^{\mp}}$ Pairs at LEP