  We adopt a bottom-up approach to constructing a new physics model to explain
the CDF excess seen in dijets with an associated lepton and missing transverse
energy. We find that the 145 GeV broad feature seen by CDF in the dijet
invariant mass distribution can be explained by a Z' boson with a mass of 145
GeV that couples only to first generation quarks. After dijet resonance
constraints are considered, a sizeable region of the parameter space favored by
the CDF anomaly remains viable.
