3 papers
hep-ph2026
GeV-scale QCD Axion
Hitoshi Murayama
In order to solve the strong CP problem, we study the possibility that the Peccei--Quinn symmetry is broken {\it below}\/ the QCD scale. We find that a QCD axion can be above GeV,…
hep-ph2025
Clearing up the Strong problem
Joshua N. Benabou, Anson Hook, Claudio Andrea Manzari +2
The absence of a neutron electric dipole moment (EDM) constrains the quantum chromodynamics (QCD) theta angle to be less than one part in ten billion, posing the Strong proble…
hep-ph2025
A High-Quality Composite Pati-Salam Axion
Tony Gherghetta, Hitoshi Murayama, Pablo Quílez
We present a composite QCD axion model where the Peccei--Quinn (PQ) symmetry emerges as a high-quality, accidental symmetry. The axion potential is only modified by eight-fermion,…