Finding the Strong CP problem at the LHC

TL;DR

This paper proposes that parity-based solutions to the strong CP problem predict new TeV-scale colored particles, which could be detected at the LHC, offering an alternative to traditional hierarchy problem solutions.

Contribution

It introduces a class of models linking parity solutions to the strong CP problem with new TeV-scale colored particles, providing unique LHC signatures and cosmological implications.

Findings

New colored particles predicted at TeV scale

Distinct LHC signatures from these particles

Models compatible with baryogenesis and cosmology

Abstract

We show that a class of parity based solutions to the strong CP problem predicts new colored particles with mass at the TeV scale, due to constraints from Planck suppressed operators. The new particles are copies of the Standard Model quarks and leptons. The new quarks can be produced at the LHC and are either collider stable or decay into Standard Model quarks through a Higgs, a W or a Z boson. We discuss some simple but generic predictions of the models for the LHC and find signatures not related to the traditional solutions of the hierarchy problem. We thus provide alternative motivation for new physics searches at the weak scale. We also briefly discuss the cosmological history of these models and how to obtain successful baryogenesis.