See-saw and Supersymmetry or Exact R-parity

TL;DR

This paper demonstrates that in supersymmetric models with spontaneously broken B-L symmetry, the see-saw mechanism naturally leads to exact R-parity at all energy scales, highlighting supersymmetry's role in this context.

Contribution

It shows how the renormalizable see-saw mechanism in supersymmetry with B-L symmetry breaking ensures exact R-parity, emphasizing supersymmetry's importance in grand unified theories.

Findings

Exact R-parity is implied at all energies by the see-saw mechanism in supersymmetry.

Supersymmetry provides a canonical form for the see-saw in grand unified theories.

The mechanism addresses the doublet-triplet splitting problem via the Dimopoulos-Wilczek approach.

Abstract

We show how the renormalizable see-saw mechanism in the context of supersymmetry and spontaneously broken B-L symmetry implies exact R-parity at all energies. We argue that supersymmetry plays an important role in providing a "canonical" form for the see-saw, in particular in grand unified theories that solve the doublet-triplet splitting problem via the Dimopoulos-Wilczek mechanism.