Texture of Single Vanishing Subtrace in Neutrino Mass Matrix

Abstract

We consider a texture for the neutrino mass matrix characterized by one vanishing $2\times 2$ subtrace. We analyze phenomenologically and analytically all the six possible patterns, and show that all non-singular ones are able to accommodate the experimental bounds, whereas singular patterns allow only for four inverted-hierarchy type textures. We then present some possible realizations of this texture, within seesaw scenarios, either directly or indirectly by relating it to zero-textures.

Comments: latex, 66 pages, 25 tables and 10 figures, to appear in PRD