Teeny, tiny Dirac neutrino masses: an unorthodox point of view

Abstract

There are now strong hints suggesting that neutrinos do have a mass after all. If they do have a mass, it would have to be tiny. Why is it so? Is it Dirac or Majorana? Can one build a model in which a teeny, tiny Dirac neutrino mass arises in a natural way? Can one learn something else other than just neutrino masses? What are the extra phenomenological consequences of such a model? These are the questions that I will try to focus on in this talk.

Comments: 11 pages, 2 figures, LateX, aipproc style. Talk presented at the Second Tropical Workshop on Particle Physics and Cosmology, Neutrino and Flavor Physics, 1-6 May 2000, San Juan, Puerto Rico