Details

Autor(en) / Beteiligte

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

Titel

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

Ist Teil von

• The journal of high energy physics, 2022-08, Vol.2022 (8), p.140-24, Article 140

Ort / Verlag

Berlin/Heidelberg: Springer Berlin Heidelberg

Erscheinungsjahr

2022

Link zum Volltext

Quelle

EZB Electronic Journals Library

Beschreibungen/Notizen

• A bstract We develop a class of left-right symmetric theories based on the gauge group SU(3) c × SU(2) L × SU(2) R × 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 ∆ N 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.