Measurement of the $B^{0}$ Lifetime with Partially Reconstructed $B^{0} \to D^{* -} ℓ^{+} ν_{ℓ}$ Decays

Publisher Website

13 June 2002

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

Vol. 89 (1) , 011802
https://doi.org/10.1103/physrevlett.89.011802

Abstract

The

B^{0}

lifetime was measured with a sample of 23 million

B \bar{B}

pairs collected by the BABAR detector at the PEP-II

e^{+} e^{-}

storage ring during 1999 and 2000. Events from the semileptonic decay

B^{0} \to D^{* -} ℓ^{+} ν_{ℓ}

have been selected with a partial reconstruction method in which only the charged lepton and the slow

π

from the

D^{* -} \to {\bar{D}}^{0} π^{-}

decay are reconstructed. The result is

τ_{B^{0}} = 1.529 \pm 0.012 (stat) \pm 0.029 (syst) ps

.

Keywords

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