We present a detailed examination of the heavy flavor content of
the W + jet data sample collected with the CDF detector during the 1992-1995
collider run at the Fermilab Tevatron. Jets containing heavy flavor quarks
are selected via the identification of secondary vertices or semileptonic
decays of b and c quarks. There is generally good agreement between the
rates of secondary vertices and soft leptons in the data and in the standard
model simulation including single and pair production of top quarks. An
exception is the number of events in which a single jet has both a soft
lepton and a secondary vertex tag. In W + 2,3 jet data, we find 13 such
events where we expected 4.4 +/- 0.6 events. The kinematic properties of
this small sample of events are statistically difficult to reconcile with
the simulation of standard model processes.
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Updated: Tuesday, 2002 March 26 13:15:10 CST automatically from input from Carol Picciolo