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

Abstract

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.

18 pages references added published version

References in corpus (10)

• Measurement of the rate of nu_e + d --> p + p + e^- interactions produced by 8B solar neutrinos at the Sudbury Neutrino Observatory
• Solar 8B and hep Neutrino Measurements from 1258 Days of Super-Kamiokande Data
• Observation of Large CP Violation in the Neutral B Meson System
• Observation of CP violation in the B^0 meson system
• Global Analysis of Solar Neutrino Oscillations Including SNO CC Measurement
• Model-dependent and independent implications of the first Sudbury Neutrino Observatory results
• Phenomenology of the Neutrino-Mass-Giving Higgs Triplet and the Low-Energy Seesaw Violation of Lepton Number
• Impact of the first SNO results on Neutrino Mass and Mixing
• Constraining Models of New Physics in Light of Recent Experimental Results on $a_{\psi K_S}$
• Neutrino, Lepton, and Quark Masses in Supersymmetry

Cited by in corpus (10)

• Perturbativity and mass scales of Left-Right Higgs bosons
• Higgs Sector of the Left-Right Model with Explicit CP Violation
• Production of the charged Higgs bosons at the CERN Large Hadron Collider in the left-right symmetric model
• Spontaneous CP Phases and Flavour Changing Neutral Currents in the Left-Right Symmetric Model
• Low Scale Seesaw, Electron EDM and Leptogenesis in a Model with Spontaneous CP Violation
• The Dark Matter Constraints on the Left-Right Symmetric Model with Z_2 Symmetry
• Neutrinos in a left-right model with a horizontal symmetry
• Lepton Masses and Mixing in a Left-Right Symmetric Model with a TeV-scale Gravity
• Exploring the charged Higgs bosons in the lef-right symmetric model
• CP violating dimuon charge asymmetry in general left-right models