Massive neutrinos in a grounds-up approach with quark-lepton similarity

2005/11/23 by Shaouly Bar-Shalom, Bar-Shalom, Shaouly, David Atwood +3
Computer Science · Physics and Astronomy · #Artificial intelligence #Computational Physics and Python Applications #Computer science #Cosmology and Gravitation Theories #Electron #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #Lepton #Neutrino #Nuclear physics #Particle physics #Particle physics theoretical and experimental studies #Physics #Quark #Similarity (geometry) #hep-ph

paper · pdf · doi:10.48550/arxiv.hep-ph/0511282

published in arXiv (Cornell University) (Cornell University) · 4 pages, talk given at the International Europhysics Conference on High Energy Physics, July 21st - 27th 2005, Lisboa, Portugal and at the 14th International Conference on Supersymmetry and the Unification of Fundamental Interactions, June 12th-17th 2006, Irvine, California, USA

openalex publication_date 2005/11/23 · arxiv created 2006/11/12 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05

Abstract

We examine neutrino oscillations in a two Higgs doublet model (2HDM) in which the second doublet couples only to the third generation right-handed up-fermions, i.e., to t_R and to N₃ which is the heaviest right-handed Majorana neutrino. The inherently large tan(beta) of this model can naturally account for the large top mass and, based on a quark-lepton similarity ansatz, when embedded into a seesaw mechanism it can also account for the observed neutrino masses and mixing angles giving a very small theta₁3: -0.017 < theta₁3 < 0.021 at 99% CL, and a very restrictive prediction for the atmospheric mixing angle: 42.9(deg) < theta_atm < 45.2(deg) at 99% CL. The large value of tan(beta) also sets the mass scale of the heaviest right-handed Majorana neutrino N₃ and triggers successful leptogenesis through a CP-asymmetry in the decays of the N₁ (lightest right-handed Majorana) which is tan²(beta) enhanced compared to the CP-asymmetry obtained in models for leptogenesis with one Higgs doublet or in the MSSM. This enhancement allows us to relax the lower bound on M_N1 and consequently also the lower bound on the reheating temperature of the early universe.

Related

• The Nature of Massive Neutrinos
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• Right-Handed Neutrino Masses from the Electroweak Scale
• Parameter space for testable leptogenesis
• Insights on the Scale of Leptogenesis from Neutrino Masses and Neutrinoless Double-Beta Decay