A Model for Neutrino and Charged Lepton Masses in Extra Dimensions

Abstract

We propose a model with one large submm size extra dimension in which the gravity and right-handed (RH) neutrino propagate, but the three Standard Model (SM) families are confined to fat branes of TeV^(-1) size or smaller. The charged leptons and the light neutrinos receive mass from the five dimensional Yukawa couplings with the SM singlet neutrino via electroweak Higgs, while the KK excitations of the SM singlet neutrino gets large TeV scale masses from the five dimensional Yukawa coupling with an electroweak singlet Higgs. The model gives non-hierarchical light neutrino masses, accommodate hierarchical charged lepton masses, and naturally explain why the light neutrino masses are so much smaller compared to the charged lepton masses. Large neutrino mixing is naturally expected in this scenario. The light neutrinos are Dirac particles in this model, hence neutrinoless double beta decay is not allowed. The model has also several interesting collider implications and can be tested at the LHC.

11 pages, no figures

References in corpus (5)

• A Measurement of Atmospheric Neutrino Oscillation Parameters by Super-Kamiokande I
• Evidence for an oscillatory signature in atmospheric neutrino oscillation
• Constraints on Large Extra Dimensions with Bulk Neutrinos
• Monojet and Single Photon Signals from Universal Extra Dimensions
• Single Kaluza Klein Production in Universal Extra Dimensions