We consider proton decay and gμ- 2 in flipped SU(5) GUT models. We first study scenarios in which the soft supersymmetry-breaking parameters are constrained to be universal at some high scale Min above the standard GUT scale where the QCD and electroweak SU(2) couplings unify. In this case the proton lifetime is typically ≳ 10 36 years, too long to be detected in the foreseeable future, and the supersymmetric contribution to gμ- 2 is too small to contribute significantly to resolving the discrepancy between the experimental measurement and data-driven calculations within the Standard Model. However, we identify a region of the constrained flipped SU(5) parameter space with large couplings between the 10- and 5-dimensional GUT Higgs representations where p→ e+π decay may be detectable in the Hyper-Kamiokande experiment now under construction, though the contribution to gμ- 2 is still small. A substantial contribution to gμ- 2 is possible, however, if the universality constraints on the soft supersymmetry-breaking masses are relaxed. We find a ‘quadrifecta’ region where observable proton decay co-exists with a (partial) supersymmetric resolution of the gμ- 2 discrepancy and acceptable values of mh and the relic LSP density.

Original languageEnglish
Article number1109
JournalEuropean Physical Journal C
Issue number12
Early online date15 Dec 2021
Publication statusPublished - Dec 2021


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