Proton lifetime upper bound in non-SUSY SU(5) GUT

Haba, Naoyuki (Institute of Science and Engineering, Shimane University, Matsue 690-8504, Japan) ; Mimura, Yukihiro (Institute of Science and Engineering, Shimane University, Matsue 690-8504, Japan) ; Yamada, Toshifumi (Institute of Science and Engineering, Shimane University, Matsue 690-8504, Japan)

16 April 2019

Abstract: In preparation for upcoming nucleon decay searches at Hyper-Kamiokande, it is important to derive a theoretical upper bound on the proton lifetime in a general class of grand unified theory (GUT) models. In this paper, we make an attempt along this direction for non-SUSY SU(5) models, under the mild restrictions that only one or two SM-decomposed multiplets are singularly light, and that the SU(5) gauge theory is asymptotically free and thus there are no too large representations in the model. We derive criteria for SM-decomposed multiplets that potentially enhance the proton lifetime when they are singularly light. We perform a numerical analysis on the proton lifetime and show that some choices of singularly light multiplets can provide a testable upper bound on the proton lifetime.


Published in: Physical Review D 99 (2019)
Published by: APS
DOI: 10.1103/PhysRevD.99.075018
License: CC-BY-4.0



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