Flipped SU(5) GUT phenomenology: proton decay and gμ- 2

John Ellis, Jason L. Evans, Natsumi Nagata, Dimitri V. Nanopoulos, Keith A. Olive

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13 Scopus citations

Abstract

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 (US)
Article number1109
JournalEuropean Physical Journal C
Volume81
Issue number12
DOIs
StatePublished - Dec 2021
Externally publishedYes

Bibliographical note

Funding Information:
The work of J.E. was supported partly by the United Kingdom STFC Grant ST/T000759/1 and partly by the Estonian Research Council via a Mobilitas Pluss grant. The work of N.N. was supported by the Grant-in-Aid for Scientific Research B (No.20H01897), Young Scientists (No.21K13916), and Innovative Areas (No.18H05542). The work of D.V.N. was supported partly by the DOE grant DE-FG02-13ER42020 and partly by the Alexander S. Onassis Public Benefit Foundation. The work of K.A.O. was supported partly by the DOE grant DE-SC0011842 at the University of Minnesota.

Publisher Copyright:
© 2021, The Author(s).

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