A Common Origin for the QCD Axion and Sterile Neutrinos from SU(5) Strong Dynamics
Journal of High Energy Physics(2023)
摘要
We identify the QCD axion and right-handed (sterile) neutrinos as bound
states of an SU(5) chiral gauge theory with Peccei-Quinn (PQ) symmetry
arising as a global symmetry of the strong dynamics. The strong dynamics is
assumed to spontaneously break the PQ symmetry, producing a high-quality axion
and naturally generating Majorana masses for the right-handed neutrinos at the
PQ scale. The composite sterile neutrinos can directly couple to the
left-handed (active) neutrinos, realizing a standard see-saw mechanism.
Alternatively, the sterile neutrinos can couple to the active neutrinos via a
naturally small mass mixing with additional elementary states, leading to light
sterile neutrino eigenstates. The SU(5) strong dynamics therefore provides a
common origin for a high-quality QCD axion and sterile neutrinos.
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关键词
Axions and ALPs,Compositeness,Hierarchy Problem,Sterile or Heavy Neutrinos
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