The Neutrino Mass Matrix - From A_4 to Z_3

Abstract

With the recent experimental advance in our precise knowledge of the neutrino oscillation parameters, the correct form of the 3 X 3 neutrino mass matrix is now approximately known. I discuss how this may be obtained from symmetry principles, using as examples the finite groups A_4 and Z_3, in two complete theories of leptons (and quarks).

Comments: 15 pages, no figure, talk at 9th Adriatic Meeting, Dubrovnik (September 2003)