A measurement of the inclusive bottom jet cross section is
presented for events containing a Z boson in p anti-p collisions at s**(1/2) =
1.96 TeV using the Collider Detector at Fermilab. Z bosons are identified
in their electron and muon decay modes, and b jets with E(t) > 20 GeV and
|eta| < 1.5 are identified by reconstructing a secondary decay vertex. The
measurement is based on an integrated luminosity of about 330 pb-1. A
cross section times branching ratio of sigma(Z + b jets) x B(Z --> l+ l-) =
0.93 +/- 0.36 pb is found, where B(Z --> l+ l-) is the branching ratio of
the Z boson or gamma* into a single flavor dilepton pair (e or mu) in the
mass range between 66 and 116 GeV/c2. The ratio of b jets to the total
number of jets of any flavor in the Z sample, within the same kinematic
range as the b jets, is 2.36 +/- 0.92%. Here, the uncertainties are the
quadratic sum of statistical and systematic uncertainties. Predictions made
with NLO QCD agree, within experimental and theoretical uncertainties, with
these measurements.
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Updated: Monday, 2006 November 20 15:29:21 CST automatically from input from Carol Picciolo