Naturally light Dirac and pseudo-Dirac neutrinos from left-right symmetry

Babu, K. S.; He, Xiao-Gang; Su, Mingxian; Thapa, Anil

doi:10.1007/jhep08(2022)140

Naturally light Dirac and pseudo-Dirac neutrinos from left-right symmetry

Journal Article · Tue Aug 16 00:00:00 EDT 2022 · Journal of High Energy Physics (Online)

DOI:https://doi.org/10.1007/jhep08(2022)140· OSTI ID:1976515

Babu, K. S. ^[1]; He, Xiao-Gang ^[2]; Su, Mingxian ^[3]; ^[4]

Oklahoma State University, Stillwater, OK (United States); Oklahoma State Univ., Stillwater, OK (United States)
Shanghai Jiao Tong University (China); National Taiwan University, Taipei (Taiwan)
Oklahoma State University, Stillwater, OK (United States)
University of Virginia, Charlottesville, VA (United States)

We develop a class of left-right symmetric theories based on the gauge group SU(3)_c x SU(2)_L x SU(2)_R x U(1) with a generalized seesaw mechanism for generating the charged fermion masses. Neutrinos are naturally Dirac particles in this setup with their small masses arising from two-loop quantum corrections. We evaluate these two-loop diagrams exactly and analyze the flavor structure of the lepton sector. We find excellent fits to neutrino oscillation data, independent of the right-handed gauge symmetry breaking scale. We also explore the possibility that neutrinos are pseudo-Dirac particles in this framework, with the tiny mass splittings between active and sterile neutrinos arising from Planck-induced corrections and find possible realizations. These models can be tested in the near future with precision cosmological measurements of ΔN_eff in CMB which is predicted to be ≃ 0.14. This class of models allows for a solution to the strong CP problem via parity symmetry without the need for an axion.

View Accepted Manuscript (DOE)

Research Organization:: Oklahoma State University, Stillwater, OK (United States)

Sponsoring Organization:: MOST; National Science Foundation (NSF); USDOE Office of Science (SC)

Grant/Contract Number:: SC0016013

OSTI ID:: 1976515

Journal Information:: Journal of High Energy Physics (Online), Journal Name: Journal of High Energy Physics (Online) Journal Issue: 8 Vol. 2022; ISSN 1029-8479

Publisher:: Springer NatureCopyright Statement

Country of Publication:: United States

Language:: English

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