Light Z' Bosons at the Tevatron
  New gauge bosons with Standard Model-like couplings to leptons are
constrained by collider searches to be heavier than approximately ~1 TeV. A Z'
boson with suppressed couplings to leptons, however, could be much lighter and
possess substantial couplings to Standard Model quarks. In this article, we
consider a new leptophobic Z' gauge boson as a simple and well motivated
extension of the Standard Model, and discuss several of its possible signatures
at the Tevatron. We find that three of the recent anomalies reported from the
Tevatron - in particular the top-quark forward-backward asymmetry and excesses
in the 3b and W + 2 jets final states - could be explained by a new Z' with a
mass of approximately 150 GeV, relatively large couplings to quarks, and
suppressed couplings to electrons and muons. Moreover, we find that such a
particle could also mediate the interactions of dark matter, leading to
potentially interesting implications for direct detection experiments.
