Strong Interactions for the LHC

TL;DR

This paper reviews recent progress in understanding non-QCD gauge theories with strong interactions relevant to dynamical electroweak symmetry breaking, emphasizing the role of approximate infrared conformal symmetry.

Contribution

It highlights advances in lattice studies of non-QCD gauge theories and discusses the importance of infrared conformal symmetry in model building.

Findings

Progress in lattice methods for non-QCD gauge theories

Insights into chiral symmetry breaking mechanisms

Role of infrared conformal symmetry in model viability

Abstract

Dynamical electroweak symmetry breaking (DEWSB) has been a viable option for the completion of the standard model for over thirty years. Precision electroweak studies indicate that the new strong interactions that break EW symmetry cannot be a scaled-up copy of QCD. Building viable models of DEWSB is difficult without a detailed understanding of such non-QCD gauge theories which still confine and break chiral symmetry. We review past difficulties of studying these theories using lattice methods and describe recent progress, focusing on the role of approximate infrared conformal symmetry.