Minimal Textures in Seesaw Mass Matrices and their low and high Energy Phenomenology

Details Minimal Textures in Seesaw Mass Matrices and their low and high Energy Phenomenology Minimal Textures in Seesaw Mass Matrices and their low and high Energy Phenomenology

2009-05-17

arxiv.org/abs/0905.2739v2

Phys.Lett.B680:255-262,2009

Physics

High Energy Physics

High Energy Physics - Phenomenology

Typos corrected

Scientific paper

10.1016/j.physletb.2009.08.056

In an attempt to find minimal scenarios we study the implications of Dirac and Majorana mass matrices with texture zeros within the type I seesaw mechanism. For the Dirac mass matrices we consider 5 zero textures which we show to be the most minimal form that can successfully account for low energy phenomenology if the Majorana mass matrices are chosen minimal as well. For those, we consider both diagonal and even more minimal non-diagonal forms. The latter can be motivated e.g. by simple U(1) flavour symmetries and have two degenerate eigenvalues. We classify the allowed textures and discuss the ramifications for leptogenesis and lepton flavour violation.

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