Measurement of the $B^{-}$ and ${\bar{B}}^{0}$ Meson Lifetimes Using Semileptonic Decays

Publisher Website

10 June 1996

journal article
research article
Published by American Physical Society (APS) in Physical Review Letters

Vol. 76 (24) , 4462-4467
https://doi.org/10.1103/physrevlett.76.4462

Abstract

The lifetimes of the

B^{-}

and

{\bar{B}}^{0}

mesons are measured using the partially reconstructed semileptonic decays

\bar{B} \to D ℓ^{-} \bar{ν} X

, where D is either a

D^{0}

or

D^{* +}

meson. The data were collected by the CDF detector at the Fermilab Tevatron collider during 1992–1993 and correspond to 19.3

{pb}^{- 1}

of

\bar{p} p

collisions at

\sqrt{s} = 1.8

TeV. We measure the decay length distributions and find the lifetimes to be

τ (B^{-}) = 1.56 \pm 0.13 \pm 0.06

ps and

τ ({\bar{B}}^{0}) = 1.54 \pm 0.08 \pm 0.06

ps, and the ratio of lifetimes to be

τ (B^{-}) / τ ({\bar{B}}^{0}) = 1.01 \pm 0.11 \pm 0.02

, where the first uncertainties are statistical and the second are systematic.

Keywords

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