Simple non-Abelian extensions of the standard model gauge group and the diboson excesses at the LHC.

The ATLAS collaboration reported excesses at around 2 TeV in the di-boson production decaying into hadronic final states. We consider the possibility of explaining the excesses with extra gauge bosons in two simple non-Abelian extensions of the Standard Model. One is the so-called G(221) models with a symmetry structure of SU(2)1⊗SU(2)2⊗U(1)X and the other is the G(331) models with an extended symmetry of SU(3)C⊗SU(3)L⊗U(1)X. The W' and Z' bosons emerge after the electroweak symmetry is spontaneously broken. Two patterns of symmetry breaking in the G(221) models are considered in this work: one is SU(2)L⊗SU(2)2⊗U(1)X→SU(2)L⊗U(1)Y, the other is SU(2)1⊗SU(2)2⊗U(1)Y→SU(2)L⊗U(1)Y. The symmetry breaking of the G(331) model is SU(3)L⊗U(1)X→SU(2)L⊗U(1)Y. We perform a global analysis of W' and Z' phenomenology in ten new physics models, including all the channels of W'/Z' decay. Our study shows that the leptonic mode and the dijet mode of W'/Z' decays impose a very stringent bound on the parameter space in several new physics models. Such tight bounds provide a useful guide for building new physics models to address on the diboson anomalies. We also note that the Left-Right and Lepton-Phobic models can explain the 3.4σ WZ excess if the 2.6σ deviation in the W+W- pair around 2 TeV were confirmed to be a fluctuation of the SM backgrounds. [ABSTRACT FROM AUTHOR]