The High Quality QCD Axion and the LHC

Abstract

The QCD axion provides an elegant solution to the Strong CP Problem. While the minimal realization is vulnerable to the so-called "Axion Quality Problem", we will consider a more robust realization in the presence of a mirror sector related to the Standard Model by a (softly broken) ${\mathbb{Z}}_2$ symmetry. We point out that the resulting "heavy" axion, while satisfying all theoretical and observational constraints, has a large and uncharted parameter space which allows it to be probed at the LHC as a Long-Lived Particle (LLP). The small defining axionic coupling to gluons results in a challenging hadronic decay signal which we argue can be distinguished against the background in such a long-lived regime, and yet, the same coupling allows for sufficient production at hadron colliders thanks to the large gluon parton luminosity. Our study opens up a new window towards accelerator observable axions, and more generally, singly produced LLPs.

8+8 pages, 9 figures, 1 table

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