A measurement of the b jet production cross section is
presented for events containing a Z boson produced in p anti-p collisions
at s**(1/2) 1.96 TeV, using data corresponding to an integrated luminosity
of 2 fb-1 collected by the CDF II detector at the Tevatron. Z bosons are
selected in the electron and muon decay modes. Jets are considered with
transverse energy E(t) > 20 GeV and pseudorapi+dity |eta|<1.5 and
are identified as b jets using a secondary vertex algorithm. The ratio of
the integrated Z+b jet cross section to the inclusive Z production cross
section is measured to be 3.32+/-0.53(stat)+/-0.42(syst)x10-3. This ratio
is also measured differentially in jet E(t), jet eta, Z-boson transverse
momentum, number of jets, and number of b jets. The predictions from
leading-order Monte Carlo generators and next-to-leading order QCD
calculations are found to be consistent with the measurements within
experimental and theoretical uncertainties.
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Updated: Thursday, 2009 July 09 10:31:55 CDT automatically from input from carol picciolo