Phenomenology of Strongly Coupled Chiral Gauge Theories

TL;DR

This paper explores a minimal, GUT-motivated chiral gauge theory with strong dynamics, predicting potential LHC signatures like gauge boson resonances and a distinctive Z' gamma resonance due to kinetic mixing.

Contribution

It introduces a novel, anomaly-free chiral gauge model with implications for collider searches, linking confinement, fermion masses, and observable resonances.

Findings

Potential LHC signatures include two gauge boson resonances.

The model predicts a Z' gamma resonance with large leptonic branching ratio.

First signatures could appear in Run 2 searches at the LHC.

Abstract

A sector with QCD-like strong dynamics is common in models of non-standard physics. Such a model could be accessible in LHC searches if both confinement and big-quarks charged under the confining group are at the TeV scale. Big-quark masses at this scale can be explained if the new fermions are chiral under a new $U(1)^\prime$ gauge symmetry such that their bare masses are related to the $U(1)^\prime$-breaking and new confinement scales. Here we present a study of a minimal GUT-motivated and gauge anomaly-free model with implications for the LHC Run 2 searches. We find that the first signatures of such models could appear as two gauge boson resonances. The chiral nature of the model could be confirmed by observation of a $Z^\prime \gamma$ resonance, where the $Z^\prime$ naturally has a large leptonic branching ratio because of its kinetic mixing with the hypercharge gauge boson.