Neutrino Masses in the Effective Rank-5 Subgroups of E_6 I: Non-supersymmetric Case

Abstract

The neutral fermion sectors of E_6-inspired low energy models, in particular the Alternative Left-Right and Inert models, are considered in detail within the non-supersymmetric scenario. We show that in their simplest form, these models always predict, for each generation, the lightest neutrino to be an SU(2)_L singlet, as well as two extra neutrinos with masses of the order of the up-quark mass. In order to recover Standard Model phenomenology, additional assumptions in the form of discrete symmetries and/or new interactions are needed. These are classified as the Discrete Symmetry (DS), Higher Dimensional Operators (HDO), and Additional Neutral Fermion (ANF) methods. The DS method can solve the problem, but requires additional Higgs doublets that do not get vacuum expectation values. The HDO method predicts no sterile neutrino, and that the active neutrinos mix with a heavy isodoublet neutrino, thus slightly suppressing the couplings of active neutrinos, with interesting phenomenological implications. The ANF method also predicts this suppression, and also naturally includes one or more "sterile" neutrinos. This scenario allows the existence of sterile neutrino(s) in either a 3+1 or 2+2 structure at low energies, which are favored by the LSND result.

25 pages, 1 figure; typos corrected, version to be published in Physical Review D

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Cited by in corpus (22)

• Physics at a future Neutrino Factory and super-beam facility
• Naturally light right-handed neutrinos in a 3-3-1 Model
• Seesaw Right Handed Neutrino as the Sterile Neutrino for LSND
• Constraining Mass Spectra with Sterile Neutrinos from Neutrinoless Double Beta Decay, Tritium Beta Decay and Cosmology
• Gauge boson families in grand unified theories of fermion masses: E_6^4 x S_4
• Searching for signatures of $E_6$
• Aspects of symmetry breaking in Grand Unified Theories
• Three sterile neutrinos in E6
• Neutrino Masses in the Effective Rank-5 Subgroups of E_6 II: Supersymmetric Case
• Minimal Flipped SO(10) x U(1) Supersymmetric Higgs Model
• Neutrino masses in quartification schemes
• Exploring $0\nu \beta \beta$ and Leptogenesis in the Alternative Left-Right Model
• Natural dark matter and light bosons with an alternative left-right symmetry
• Doubly Charged Higgsinos at Tevatron
• Neutralino Dark Matter in the Left-Right Supersymmetric Model
• Vacuum Structure of Alternative Left-Right Model
• Dark Matter in the Alternative Left Right Model
• Sterile Neutrinos in String Derived Models
• D-term assisted Anomaly Mediation in E6 motivated models
• Invisible Z decay width bounds on active-sterile neutrino mixing in the (3+1) and (3+2) models
• Leptonic probes of Alternative Left-Right Symmetric Models
• Gauge coupling unification with extra Higgs doublets