Alternatives to Seesaw

Details Alternatives to Seesaw Alternatives to Seesaw

2004-10-10

arxiv.org/abs/hep-ph/0410140v1

Nucl.Phys.Proc.Suppl.137:206-219,2004

Physics

High Energy Physics

High Energy Physics - Phenomenology

Talk at Fujihara Seminar On Neutrino Mass And Seesaw Mechanism (SEESAW 1979-2004), 23-25 Feb 2004, KEK. 14 pages, uses espcrc2

Scientific paper

10.1016/j.nuclphysbps.2004.10.07

The seesaw mechanism is attractive not only because it "explains'' small neutrino mass, but also because of its packaging with the SUSY-GUT, leptogenesis, Dark Matter, and electroweak symmetry breaking. However, this package has the flavor, CP, and gravitino problems. I discuss two alternatives to the seesaw mechanism. In one of them, the anomaly-mediated supersymmetry breaking solves these problems, while predicts naturally light Dirac neutrinos. In the other, the light Majorana neutrinos arise from supersymmetry breaking with right-handed neutrinos below TeV, and the Dark Matter and collider phenomenology are significantly different.

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