Finding the strong CP problem at the LHC

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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.

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D’Agnolo, R. T., & Hook, A. (2016). Finding the strong CP problem at the LHC. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 762, 421–425. https://doi.org/10.1016/j.physletb.2016.09.061

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