Alternatives to Seesaw

Abstract

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.

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

References in corpus (4)

• Big-Bang Nucleosynthesis and Hadronic Decay of Long-Lived Massive Particles
• Asymmetric Sneutrino Dark Matter and the Omega(b)/Omega(DM) Puzzle
• Extended Anomaly Mediation and New Physics at 10 TeV
• Gravitino and Goldstino at Colliders

Cited by in corpus (10)

• Minimal Mass Matrices for Dirac Neutrinos
• Neutrino Masses in Supersymmetric SU(3)_C x SU(2)_L x U(1)_Y x U(1)' Models
• Renormalization Group Evolution of Dirac Neutrino Masses
• Neutrino Masses from the Top Down
• Neutrino Oscillations in a Supersymmetric SO(10) Model with Type-III See-Saw Mechanism
• Dirac Neutrinos and Hybrid Inflation from String Theory
• High Scale Mixing Unification for Dirac Neutrinos
• Precise predictions for Dirac neutrino mixing
• Texture One Zero Dirac Neutrino Mass Matrix With Vanishing Determinant or Trace Condition
• Constraint on the heavy sterile neutrino mixing angles in the SO(10) model with double see-saw mechanism