Neutrino Masses in Supersymmetry: R-Parity and Leptogenesis

Abstract

In the supersymmetric standard model of particle interactions, R-parity nonconservation is often invoked to obtain nonzero neutrino masses. We point out here that such interactions of the supersymmetric particles would erase any pre-existing lepton or baryon asymmetry of the universe before the electroweak phase transition through the $B+L$ violating sphaleron processes. We then show how neutrino masses may be obtained in supersymmetry (assuming R-parity conservation) together with successful leptogenesis and predict the possible existence of new observable particles.

LATEX, 12 pages

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• Leptogenesis from Neutralino Decay with Nonholomorphic R-Parity Violation
• Escape from washing out of baryon number in a two-zero-texture general Zee model compatible with the large mixing angle MSW solution
• Three Active and Two Sterile Neutrinos in an E_6 Model of Diquark Baryogenesis
• R-parity violation assisted thermal leptogenesis in the seesaw mechanism
• Leptogenesis from R parity nonconservation
• Neutrino Oscillations in Supersymmetry without Lepton number conservation and R-parity
• Z_2-Singlino Dark Matter in a Portal-Like Extension of the Minimal Supersymmetric Standard Model
• Resonant Leptogenesis with nonholomorphic R-Parity violation and LHC Phenomenology
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• How Neutrinos Get Mass and What Other Things May Happen Besides Oscillations