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Non-Invertible Peccei-Quinn Symmetry and the Massless Quark Solution to the Strong CP Problem

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arxiv 2402.12453 v1 pith:2ZOEBCFB submitted 2024-02-19 hep-ph hep-th

Non-Invertible Peccei-Quinn Symmetry and the Massless Quark Solution to the Strong CP Problem

classification hep-ph hep-th
keywords quarksolutionflavormasslessnon-invertiblepeccei-quinnproblemstrong
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We consider theories of gauged quark flavor and identify non-invertible Peccei-Quinn symmetries arising from fractional instantons when the resulting gauge group has non-trivial global structure. Such symmetries exist solely because the Standard Model has the same numbers of generations as colors, $N_g = N_c$. This leads us to a massless down-type quark solution to the strong CP problem in an ultraviolet $SU(9)$ theory of quark color-flavor unification. We show how the CKM flavor structure and weak CP violation can be generated without upsetting our solution.

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Forward citations

Cited by 8 Pith papers

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