We present the results of a search for new particles that
lead to a Z boson plus jets in p anti-p collisions at s**(1/2) = 1.96 TeV
using the Collider Detector at Fermilab (CDF II). A data sample with a
luminosity of 1.06 fb-1 collected using Z boson decays to ee and mu mu is
used. We describe a completely data-based method to predict the dominant
background from standard-model Z+jet events. This method can be similarly
applied to other analyses requiring background predictions in multi-jet
environments, as shown when validating the method by predicting the
background from W+jets in tt-bar production. No significant excess above
the background prediction is observed, and a limit is set using a fourth
generation quark model to quantify the acceptance. Assuming BR(b' -->
bZ) ñ00% and using a leading-order calculation of the b' cross section,
b' quark masses below 268 GeV/c2 are excluded at 95% confidence level.
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Updated: Monday, 2007 October 22 12:34:38 CDT automatically from input from carol picciolo