Symmetry Restored in Dibosons at the LHC?

Abstract

A number of LHC resonance search channels display an excess in the invariant mass region of 1.8 - 2.0 TeV. Among them is a $3.4\sigma$ excess in the fully hadronic decay of a pair of Standard Model electroweak gauge bosons, in addition to potential signals in the $HW$ and dijet final states. We perform a model-independent cross-section fit to the results of all ATLAS and CMS searches sensitive to these final states. We then interpret these results in the context of the Left-Right Symmetric Model, based on the extended gauge group $SU(2{)}_L\times SU(2{)}_R\times U(1{)}^{\prime }$, and show that a heavy right-handed gauge boson $W_R$ can naturally explain the current measurements with just a single coupling $g_R\sim 0.4$. In addition, we discuss a possible connection to dark matter.

Comments: 25 pages, 12 figures, V2: references added, extended discussion of Minimal Left-Right Dark Matter, small correction to decay width - conclusions unchanged, V3: expanded discussion of input parameters and statistical procedure, V4: matches published version