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arXiv · 2504.16022

Non-Renormalizable SU(5) GUTs: Leptoquark-Induced Neutrino Masses

Ilja Doršner·Mijo Matković·Shaikh Saad
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Abstract

We revisit the doublet-triplet splitting problem within the $SU(5)$ gauge group framework to advocate a viable regime with the light scalar leptoquark of the doublet-triplet splitting notoriety that is compatible with the current experimental bounds on partial proton decay lifetimes. We explicitly demonstrate, through a consistent use of higher-dimensional operators, how to implement suppression of baryon number violating interactions of the aforementioned color triplet. Our study thus offers an alternative approach to the doublet-triplet splitting problem as it removes a need for an extreme mass hierarchy between the partners residing in the same representation. We furthermore pursue two different extensions of two distinct symmetry breaking scenarios of $SU(5)$, one with a $24$-dimensional representation and the other one with a $75$-dimensional representation, to produce comparative study of novel consequences for the gauge coupling unification and the one-loop level neutrino mass generation. Our results point towards qualitatively novel $SU(5)$ scenarios, where the light scalar leptoquarks, responsible for the neutrino mass generation, might be even accessible at colliders and thus serve as an accelerator accessible portal to the high-scale physics.

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Ilja Doršner, Mijo Matković, Shaikh Saad. 2025-04-22. Non-Renormalizable SU(5) GUTs: Leptoquark-Induced Neutrino Masses. https://arxiv.org/abs/2504.16022

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