[SLAC] [SLAC Pubs and Reports]
SLAC-PUB-7826
[missing .title]
Abstract
We have measured the B hadron energy distribution in
Z0 decays using a new technique applied to a sample
of inclusive B decays recorded in the SLD experiment at SLAC
between 1996 and 1997. The upgraded CCD vertex detector is used to
reconstruct B-decay vertices with high efficiency and purity,
and to provide precise measurements of the kinematic quantities used
in this technique. For each reconstructed B-decay vertex, the
part of the B energy missing from the vertex is derived from
the kinematic quantities. B vertices with low missing mass are
selected to provide a very high purity sample and to obtain good
energy resolution. We compare the scaled B hadron energy
distribution with the predictions of several QCD and phenomenological
models of heavy quark fragmention. The average scaled energy
<xB> is measured to be 0.719 +/- 0.005(stat.)+/- 0.001
(unfolding)(preliminary).
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