Verifiable Model of Neutrino Masses from Large Extra Dimensions

Abstract

We propose a new scenario of neutrino masses with a Higgs triplet $({\xi }^{++},{\xi }^{+},{\xi }^0)$ in a theory of large extra dimensions. Lepton number violation in a distant brane acts as the source of a very small trilinear coupling of $\xi$ to the standard Higgs doublet in our brane. Small realistic Majorana neutrino masses are \underline{naturally} obtained with the fundamental scale $M_{\ast }\sim \mathcal{O}(1)$ TeV, foretelling the possible discovery of $\xi$ $(m_{\xi }\text{lsim}{M}_{\ast })$ at future colliders. Decays of ${\xi }^{++}$ into same-sign dileptons are fixed by the neutrino mass matrix. Observation of $\mu -e$ conversion in nuclei is predicted.

Comments: A comment on Tevatron reach and two references added. Discussion and conclusions unchanged