Proton decay:flipped vs. unflipped SU(5)
Ellis, John, Garcia, Marcos A.G., Nagata, Natsumi, Nanopoulos, Dimitri V., Olive, Keith A., Ellis, John, Garcia, Marcos A.G., Nagata, Natsumi, Nanopoulos, Dimitri V., Olive, Keith A.
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<sup>0</sup>µ<sup>+</sup>)/Γ(p → π<sup>0</sup>e<sup>+</sup>), Γ(p → π<sup>+</sup>ν<sup>-</sup>)/Γ(p → π<sup>0</sup>e<sup>+</sup>), Γ(p → K<sup>0</sup>e<sup>+</sup>)/Γ(p → π<sup>0</sup>e<sup>+</sup>) and Γ(p → K<sup>0</sup>µ<sup>+</sup>)/Γ(p → π<sup>0</sup>µ<sup>+</sup>), and that predictions for the ratios Γ(p → π<sup>0</sup>µ<sup>+</sup>)/Γ(p → π<sup>0</sup>e<sup>+</sup>) and Γ(p → π<sup>+</sup>ν<sup>-</sup>)/Γ(p → π<sup>0</sup>e<sup>+</sup>) 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.