Measurement of the b baryon lifetime and branching fractions in Z decays
The ALEPH Collaboration, R. Barate et al.
Laboratoire de Physique des Particules (LAPP), IN2P3-CNRS, F-74019 Annecy-le-Vieux Cedex, France
Received: 15 August 1997
Abstract
Using approximately 4 million hadronic Z decays recorded with the
ALEPH detector from 1991 through 1995, the lifetime of the b baryon
is measured with three independent methods. From the impact parameter
distribution of candidate leptons
in 1063 events with combinations, the average b baryon lifetime is
measured to be
ps. From a sample of 193 fully
reconstructed
candidates correlated
with a lepton and a sample of 46
combinations, the
lifetime is
measured to be
ps.
The product branching fractions to these final states
are
for the first sample and
for the
second and third samples combined.
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