Proton decay: flipped vs. unflipped SU(5)

Abstract

Abstract We analyze nucleon decay modes in a no-scale supersymmetric flipped SU(5) GUT model, and contrast them with the predictions for proton decays via dimension-6 operators in a standard unflipped supersymmetric SU(5) GUT model. We find that these GUT models make very different predictions for the ratios Γ(p → π 0 μ +)/Γ(p → π 0 e +), Γ(p → π + ν ¯ $$ {\pi}^{+}\overline{\nu} $$ )/Γ(p → π 0 e +), Γ(p → K 0 e +)/Γ(p → π 0 e +) and Γ(p → K 0 μ +)/Γ(p → π 0 μ +), and that predictions for the ratios Γ(p → π 0 μ +)/Γ(p → π 0 e +) and Γ(p → π + ν ¯ $$ {\pi}^{+}\overline{\nu} $$ )/Γ(p → π 0 e +) also differ in variants of the flipped SU(5) model with normal- or inverse-ordered light neutrino masses. Upcoming large neutrino experiments may have interesting opportunities to explore both GUT and flavour physics in proton and neutron decays.

Keywords

• Supersymmetry Phenomenology