| Summary: | Abstract We propose novel collider searches which can significantly improve the LHC reach to new gauge bosons Z′ with mixed anomalies with the electroweak (EW) gauge group. Such a Z′ necessarily acquires a Chern-Simons coupling to the EW gauge bosons and these couplings can drive both exotic Z decays into Z′γ if the new gauge boson is sufficiently light, as well as Z′ decays into EW gauge bosons. While the exotic decay rate of the heavy Z into Z′γ is too small to be observed at the LHC, for a light Z′, we show the potential of a lepton jet search in association with a photon to probe the rare decay Z → Z′γ.
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