Spectrum-doubled Heavy Vector Bosons at the LHC

TL;DR

This paper proposes a model with six heavy vector bosons that can explain 2 TeV di-boson excesses at the LHC while satisfying precision constraints, and predicts testable signals at future runs.

Contribution

It introduces a simple effective field theory with multiple heavy vectors that preserves symmetries and explains LHC anomalies, extending previous models with novel symmetry considerations.

Findings

Model explains LHC di-boson excesses near 2 TeV.

All new particles have masses within 10% of each other.

Some particles have detectable production rates at current LHC energies.

Abstract

We study a simple effective field theory incorporating six heavy vector bosons together with the standard-model field content. The new particles preserve custodial symmetry as well as an approximate left-right parity symmetry. The enhanced symmetry of the model allows it to satisfy precision electroweak constraints and bounds from Higgs physics in a regime where all the couplings are perturbative and where the amount of fine-tuning is comparable to that in the standard model itself. We find that the model could explain the recently observed excesses in di-boson processes at invariant mass close to 2 TeV from LHC Run 1 for a range of allowed parameter space. The masses of all the particles differ by no more than roughly 10%. In a portion of the allowed parameter space only one of the new particles has a production cross section large enough to be detectable with the energy and luminosity of Run 1, both via its decay to WZ and to Wh, while the others have suppressed production rates. The model can be tested at the higher-energy and higher-luminosity run of the LHC even for an overall scale of the new particles higher than 3 TeV.