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It is well-known that the $SU(5)$ grand unified theory, with the standardmodel quarks and leptons unified in $\overline{5}$ and $10$ and the electroweakHiggs doublet residing in $5$ dimensional representations, leads to relation,$Y_d=Y_e^T$, between the Yukawa couplings of the down-type quarks and thecharged leptons. We show that this degeneracy can be lifted in aphenomenologically viable way when quantum corrections to the tree-levelmatching conditions are taken into account in the presence of one or morecopies of gauge singlet fermions. The 1-loop threshold corrections arising fromheavy leptoquark scalar and vector bosons, already present in the minimalmodel, and heavy singlet fermions can lead to realistic Yukawa couplingsprovided their masses differ by at least two orders of magnitude. The lattercan also lead to a realistic light neutrino mass spectrum through the type Iseesaw mechanism if the colour partner of the Higgs stays close to the Planckscale. Most importantly, our findings demonstrate the viability of the simplestYukawa sector when quantum corrections are considered and sizeable thresholdeffects are present.

Quantum corrections and the minimal Yukawa sector of $SU(5)$