Texture of Single Vanishing Subtrace in Neutrino Mass Matrix

TL;DR

This paper investigates a specific neutrino mass matrix texture with a vanishing 2x2 subtrace, analyzing all patterns and their compatibility with experimental data, and explores realizations within seesaw models.

Contribution

It provides a comprehensive analysis of all six patterns of the texture and links them to phenomenological viability and model realizations.

Findings

Non-singular patterns fit experimental bounds.

Singular patterns only support inverted hierarchy.

Possible realizations within seesaw scenarios.

Abstract

We consider a texture for the neutrino mass matrix characterized by one vanishing $2\times2$ 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.