Heavy Vectors in Higgs-less models

TL;DR

This paper investigates heavy spin-1 vector bosons as alternatives to the Higgs in maintaining unitarity and their compatibility with electroweak precision tests, comparing composite and gauge models.

Contribution

It introduces two prototype models for heavy vectors and analyzes their ability to satisfy electroweak precision constraints without a Higgs.

Findings

Gauge model cannot account for electroweak precision tests with heavy vectors

Composite model can potentially satisfy electroweak constraints

Constraints on heavy vector properties derived from model analysis

Abstract

One or more heavy spin-1 fields may replace the Higgs boson in keeping perturbative unitarity up to a few TeV. By means of two prototype chiral models for the heavy spin-1 bosons, a "composite" model or a "gauge" model, we discuss if and how the sole exchange of the same fields can also account for the ElectroWeak Precision Tests. While this proves impossible in the gauge model, the composite model hints to a positive solution, which we exploit to constrain the phenomenological properties of the heavy vectors.