The BESS model revisited as a Higgsless Linear Moose @ the LHC

TL;DR

This paper explores a four-site Higgsless model predicting multiple new gauge bosons, analyzing their properties, experimental constraints, and potential for early detection at the LHC, expanding on previous minimal models.

Contribution

It extends the BESS model to include additional gauge bosons with sizeable fermion couplings, and assesses their detectability at the LHC.

Findings

All six extra gauge bosons could be discovered early at the LHC.

The model allows sizeable fermion-boson couplings consistent with electroweak data.

Constraints from LEP and Tevatron data limit the masses and couplings of the new particles.

Abstract

We study the phenomenological consequences of a four site Higgsless model based on the SU(2)_L x SU(2)_1 x SU(2)_2 x U(1)_Y gauge symmetry, which predicts two neutral and four charged extra gauge bosons, Z_{1,2} and W_{1,2}. The model represents an extension of the minimal three site version (or BESS model), largely investigated in the literature, which includes three heavy vector bosons. We compute the properties of the new particles, and derive indirect and direct limits on their masses and couplings from LEP and Tevatron data and from the perturbative unitarity requirements. In contrast to other Higgsless models characterized by fermiophobic extra gauge bosons, here sizeable fermion-boson couplings are allowed by the electroweak precision data. The prospects of detecting the new predicted particles in the favoured Drell-Yan channel at the LHC are thus investigated. The outcome is that all six extra gauge bosons could be discovered in the early stage of the LHC low-luminosity run.