Flavor Seesaw Mechanism

Abstract

In the Standard Model, Yukawa couplings parametrize the fermion masses and mixing angles with the exception of neutrino masses. The hierarchies and apparent regularities among the quark and lepton masses are, however, otherwise a mystery. We propose a new class of models having vector-like fermions that can potentially address this problem and provide a new mechanism for fermion mass generation. The masses of the third and second generations of quarks and leptons arise at tree level via the seesaw mechanism from new physics at moderately higher scales, while loop corrections produce the masses for the first generation. This mechanism has a number of interesting and testable consequences. Among them are unavoidable flavor-violating signals at the upcoming experiments and the fact that neutrinos have naturally only Dirac masses.

25 pages + references, 5 figures, 5 tables, matches published version

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• Observation of a new boson at a mass of 125 GeV with the CMS experiment at the LHC
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• Simplest Radiative Dirac Neutrino Mass Models
• Probing the $R_{K^{(\ast )}}$ Anomaly at a Muon Collider
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Cited by in corpus (7)

• Vector-like quarks: status and new directions at the LHC
• Radiatively generated fermion mass hierarchy from flavour non-universal gauge symmetries
• Gauged $SU(3{)}_F$ and loop induced quark and lepton masses
• Loop-induced masses for the first two generations with optimum flavour violation
• Radiative Origin of Fermion Mass Hierarchy in Left-Right Symmetric Theory
• Radiative Mass Mechanism: Addressing the Flavour Hierarchy and Strong CP Puzzle
• From Higgs physics to lepton flavour violation: current bounds and future prospects for vector-like lepton models