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Peccei-Quinn symmetry for Dirac seesaw and leptogenesis
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We extend the DFSZ invisible axion model to simultaneously explain small Dirac neutrino masses and cosmic matter-antimatter asymmetry. After the Peccei-Quinn and electroweak symmetry breaking, the effective Yukawa couplings of the Dirac neutrinos to the standard model Higgs scalar can be highly suppressed by the ratio of the vacuum expectation value of an iso-triplet Higgs scalar over the masses of some heavy gauge-singlet fermions, iso-doublet Higgs scalars or iso-triplet fermions. The iso-triplet fields can carry a zero or nonzero hypercharge. Through the decays of the heavy gauge-singlet fermions, iso-doublet scalars or iso-triplet fermions, we can obtain a lepton asymmetry in the left-handed leptons and an opposite lepton asymmetry in the right-handed neutrinos. Since the right-handed neutrinos do not participate in the sphaleron processes, the left-handed lepton asymmetry can be partially converted to a baryon asymmetry.
Forward citations
Cited by 2 Pith papers
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Axion framework with color-mediated Dirac neutrino masses
A KSVZ-type axion framework generates Dirac neutrino masses through colored vector-like quarks and leptoquarks, linking neutrino mass, strong CP, and dark matter.
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Minimal Dirac seesaw dark matter
A Z4-symmetric Dirac seesaw makes the imaginary part of a seesaw scalar a stable dark matter candidate and links its phenomenology to gravitational wave and CMB observables.
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