Anomalous $Z'$ and Diboson Resonances at the LHC
arXiv:1712.01840 · doi:10.1007/JHEP04(2018)122
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 $Z \to Z' γ$.
17 pages, 4 figures. v2: equation corrected, main results in Section 4 unchanged, accepted for publication in JHEP