The paper shows that non-renormalizable SU(5) models can host light scalar leptoquarks with suppressed proton decay while explaining neutrino masses and unifying gauge couplings.
Minimal supersymmetric SU(5) theory and proton decay: where do we stand?
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abstract
We review the situation regarding d=5 proton decay in the minimal supersymmetric SU(5) GUT. The minimal theory is defined as the theory with the minimal matter and Higgs content all the way up to the Planck scale; of course, this allows for the possible presence of Planck induced physics. It can be said that either higher dimensional operators must be present or/and some fine-tuning of O(1%) of the Higgs mass must be tolerated in order to save the theory.
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Non-Renormalizable SU(5) GUTs: Leptoquark-Induced Neutrino Masses
The paper shows that non-renormalizable SU(5) models can host light scalar leptoquarks with suppressed proton decay while explaining neutrino masses and unifying gauge couplings.