$\vert \Delta {\mathit \tau}_{{{\mathit b}}}\vert /{\mathit \tau}_{\mathrm {{{\mathit b}} ,{{\overline{\mathit b}}} }}$

INSPIRE  
${\mathit \tau}_{\mathrm {{{\mathit b}} ,{{\overline{\mathit b}}} }}$ and $\vert \Delta {\mathit \tau}_{{{\mathit b}}}\vert $ are the mean life average and difference between ${{\mathit b}}$ and ${{\overline{\mathit b}}}$ hadrons.
VALUE DOCUMENT ID TECN  COMMENT
$-0.001$ $\pm0.012$ $\pm0.008$ 1
ABBIENDI
1999J
OPAL ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit Z}}$
1  Data analyzed using both the jet charge and the charge of secondary vertex in the opposite hemisphere.
References:
ABBIENDI 1999J
EPJ C12 609 Measurement of the ${{\mathit B}^{+}}$ and ${{\mathit B}^{0}}$ Lifetimes and Search for $\mathit CP(T)$ Violation using Reconstructed Secondary Vertices