Measurement of the $Λ_{b}^{0}$ Lifetime Using $Λ_{b}^{0} \to Λ_{c}^{+} ℓ^{-} \bar{ν}$

Publisher Website

19 August 1996

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

Vol. 77 (8) , 1439-1443
https://doi.org/10.1103/physrevlett.77.1439

Abstract

The lifetime of

Λ_{b}^{0}

is measured using the semileptonic decay

Λ_{b}^{0} \to Λ_{c}^{+} ℓ^{-} ν \bar{}

, where the

Λ_{c}^{+}

is reconstructed through its decay

Λ_{c}^{+} \to {pK}^{-} π^{+}

. The data were collected by the CDF detector at the Tevatron Collider during 1992–1995 and correspond to an integrated luminosity of

110 {pb}^{- 1}

of

p \bar{p}

collisions at

\sqrt{s} = 1.8 TeV

. From a fit to the decay length distribution of the

Λ_{c}

-lepton system from

197 \pm 25

signal events, the lifetime of

Λ_{b}^{0}

is measured to be

1.32 \pm 0.15 \pm 0.07 ps

.

Keywords

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