Neutrino masses and mixing in supersymmetric models without R parity

Francesca Borzumati, Yuval Grossman, Enrico Nardi, Yosef Nir

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Abstract

We study neutrino masses and mixing in supersymmetric models without R parity and with generic soft Supersymmetry breaking terms. Neutrinos acquire mass from various sources: tree level neutrino-neutralino mixing, loop effects and non-renormalizable operators. Abelian horizontal symmetries (invoked to explain the smallness and hierarchy in quark parameters) replace R parity in suppressing neutrino masses. We find lower bounds on the mixing angles: sin θij ≳ m(li -)/m(lj -) (i < j) and unusual order of magnitude predictions for neutrino mass ratios: Hi(νe)/m(νμ) ∼ sin2 θ12; m(νi)/m(ντ) ∼ 10-7 sin2 θi3 (i = 1, 2). Bounds from laboratory experiments exclude mντ ≳ 3 MeV and cosmological constraints exclude mντ ≳ 100 eV. Neither the solar nor the atmospheric neutrino problems are likely to be solved by νμ - νe oscillations. These conclusions can be evaded if holomorphy plays an important role in the lepton Yukawa couplings.

Original languageEnglish
Pages (from-to)123-130
Number of pages8
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume384
Issue number1-4
DOIs
Publication statusPublished - 1996 Sep 19
Externally publishedYes

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parity
neutrinos
mass ratios
hierarchies
supersymmetry
leptons
quarks
operators
oscillations
symmetry
predictions

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

Cite this

Neutrino masses and mixing in supersymmetric models without R parity. / Borzumati, Francesca; Grossman, Yuval; Nardi, Enrico; Nir, Yosef.

In: Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, Vol. 384, No. 1-4, 19.09.1996, p. 123-130.

Research output: Contribution to journalArticle

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