On Neutrino Masses and a Low Breaking Scale of Left-Right Symmetry

Details On Neutrino Masses and a Low Breaking Scale of Left-Right Symmetry On Neutrino Masses and a Low Breaking Scale of Left-Right Symmetry

2001-08-22

arxiv.org/abs/hep-ph/0108176v2

Phys.Rev. D65 (2002) 053007

Physics

High Energy Physics

High Energy Physics - Phenomenology

18 pages references added published version

Scientific paper

10.1103/PhysRevD.65.053007

In left-right symmetric models (LRSM) the light neutrino masses arise from two sources: the seesaw mechanism and a VEV of an SU(2)$_L$ triplet. If the left-right symmetry breaking, $v_R$, is low, $v_R\lsim15\TeV$, the contributions to the light neutrino masses from both the seesaw mechanism and the triplet Yukawa couplings are expected to be well above the experimental bounds. We present a minimal LRSM with an additional U(1) symmetry in which the masses induced by the two sources are below the eV scale and the two-fold problem is solved. We further show that, if the U(1) symmetry is also responsible for the lepton flavor structure, the model yields a small mixing angle within the first two lepton generations.

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