The cross section for jets from b quarks produced
simultaneously with a W boson has been measured in p anti-p collision data
from 1.9 fb-1 of integrated luminosity recorded by the CDF II detector at
the Tevatron. Jets consistent with the decay of long-lived hadrons are
selected by identifying a displaced decay vertex. The invariant mass of
the charged particle tracks associated with the vertex is sensitive to
the flavor of the decaying hadron and is used to determine the fraction
of jets from b-quark production. We measure a b-jet cross section of
2.74 +/- 0.27(stat.) +/- 0.42(syst.) pb in association with one flavor
of leptonic W boson decay over a limited kinematic phase space.
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Updated: Monday, 2010 April 05 15:56:31 CDT automatically from input from carol picciolo