2023
DOI: 10.48550/arxiv.2301.13405
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Novel loop-diagrammatic approach to QCD $θ$ parameter and application to the left-right model

Abstract: When the QCD axion is absent in full theory, the strong CP problem has to be explained by an additional mechanism, e.g., the left-right symmetry. Even though tree-level QCD θ parameter is restricted by the mechanism, radiative corrections to θ are mostly generated, which leads to a dangerous neutron electric dipole moment (EDM). The ordinary method for calculating the radiative θ utilizes an equation θ = arg det m loop q based on the chiral rotations of complex quark masses. In this paper, we point out that wh… Show more

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