TY - JOUR
T1 - Neutrino masses and mixing in supersymmetric models without R parity
AU - Borzumati, Francesca M.
AU - Grossman, Yuval
AU - Nardi, Enrico
AU - Nir, Yosef
N1 - Funding Information:
F.M.B. acknowledgesd iscussions with R. Hempf-ling. Y.N. is supportedi n part by the United States-Israel Binational Science Foundation (BSF) , by the Israel Commission for Basic Research, and by the Minerva Foundation (Munich).
PY - 1996/9/19
Y1 - 1996/9/19
N2 - 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.
AB - 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.
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U2 - 10.1016/0370-2693(96)00823-4
DO - 10.1016/0370-2693(96)00823-4
M3 - Article
AN - SCOPUS:0042094476
SN - 0370-2693
VL - 384
SP - 123
EP - 130
JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
IS - 1-4
ER -