Journal
JOURNAL OF HIGH ENERGY PHYSICS
Volume -, Issue 10, Pages -Publisher
SPRINGER
DOI: 10.1007/JHEP10(2020)111
Keywords
Beyond Standard Model; Gauge Symmetry; Global Symmetries; Heavy Quark Physics
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Funding
- National Research Foundation of Korea (NRF) - Korea government (MSIT) [NRF-2018R1A2A3075605]
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We propose a minimal model in which the flavour anomaly in the b -> s mu (+)mu (-) transition is connected to the breaking of Peccei-Quinn (PQ) symmetry. The flavour anomaly is explained from new physics contribution by introducing one generation of heavy quark and heavy lepton which are vector-like under the standard model (SM) gauge group but charged under a local U(1)(X) group. They mix with the SM quarks and leptons, inducing flavour-changing Z ' couplings, which generates the b -> s mu (+)mu (-) anomaly at tree level. On the other hand the new fermions are chiral under the global Peccei-Quinn(PQ) symmetry. The pseudo-Goldstone boson coming from the spontaneous breaking of the PQ symmetry becomes an axion, solving the strong CP problem and providing a cold dark matter candidate. The same symmetry prevents the right-handed neutrino from having a Majorana mass term. But the introduction of a neutrino-specific Higgs doublet allows neutrino to have Dirac mass term without fine-tuning problem. The model shows an interplay between axion, neutrino, dark matter, and flavour physics.
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