Proton decay prediction from a gauge-Higgs unification scenario in five dimensions


The Higgs boson mass and top quark mass imply that the Higgs quartic coupling vanishes around the scale of 10(9)-10(13) GeV, depending on the precise value of the top quark mass. The vanishing quartic coupling can be naturally addressed if the Higgs field originates from a five-dimensional gauge field and the fifth dimension is compactified at the scale of the vanishing Higgs quartic coupling, which is a scenario based on gauge-Higgs unification. We present a general prediction of the scenario on the proton decay process p -> pi(0)e(+). In many gauge-Higgs unification models, the first-generation fermions are localized towards an orbifold fixed point in order to realize the realistic Yukawa couplings. Hence, four-fermion operators responsible for the proton decay can appear with a suppression of the five-dimensional Planck scale (not the four-dimensional Planck scale). Since the five-dimensional Planck scale is connected to the compactification scale, we have a correlation between the proton partial decay width and the top quark mass. We show that the future Hyper-Kamiokande experiment may discover the proton decay if the top quark pole mass is larger than about 172.5 GeV.

MASS, T(T)OVER-BAR, STABILITY, Astronomy & Astrophysics, Physics, Particles & Fields, Physics
Haba, N., Okada, N., Yamada, T. (2016): Proton Decay Prediction from a Gauge-Higgs Unification Scenario in Five Dimensions. Physical Review D, 94(7). DOI: https://doi,org/10.1103/PhysRevD,94,071701