Light neutrinos from massless texture and below TeV seesaw scale

Details Light neutrinos from massless texture and below TeV seesaw scale Light neutrinos from massless texture and below TeV seesaw scale

2010-04-28

arxiv.org/abs/1004.5111v2

Phys.Rev.D84:033002,2011

Physics

High Energy Physics

High Energy Physics - Phenomenology

15 pages, latex, 2 figure (ps), some modifications made

Scientific paper

10.1103/PhysRevD.84.033002

We present general conditions on Dirac and Majorana mass terms under which a type-I seesaw mechanism can lead to three exactly massless neutrinos at the tree level. We depict several examples where the conditions are satisfied and relate some of them to an underlying U(1) symmetry. We show that higher order corrections may generate the small observed masses and this may be achieved even when the heavy Majorana neutrinos are at the electroweak scale or a little higher.

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