TL;DR
This paper examines the conditions under which axions can solve the strong CP problem considering additional symmetry-breaking effects, highlighting that fifth force experiments can impose stronger constraints than neutron EDM measurements.
Contribution
It demonstrates that fifth force experiments can provide more stringent bounds on axion quality than neutron electric dipole moment measurements when the PQ-Higgsing scalar couples to the Standard Model.
Findings
Fifth force experiments can surpass neutron EDM constraints on axion quality.
Explicit PQ symmetry breaking effects impact axion's role in solving the strong CP problem.
Couplings between PQ-Higgsing scalar and Standard Model are crucial for experimental constraints.
Abstract
We investigate what it takes for the axion to address the strong CP problem in the presence of explicit Peccei-Quinn (PQ) symmetry breaking effects besides the strong interaction. In cases where the PQ-Higgsing scalar field directly couples to the Standard Model sector, it is pointed out that existing fifth force experiments can set better constraints on the axion quality over neutron electric dipole moment.
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Taxonomy
TopicsDark Matter and Cosmic Phenomena · Particle physics theoretical and experimental studies · Black Holes and Theoretical Physics