Verifiable model of neutrino masses from large extra dimensions

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 naturally obtained with the fundamental scale M* similar to O(1) TeV, foretelling the possible discovery of xi (m(xi) less than or similar to M*) 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.