  The discovery of the Higgs boson with a mass of around 125 GeV gives a strong
motivation for further study of a high-scale supersymmetry (SUSY) breaking
model. In this framework, the minimal SUSY SU(5) grand unification model may be
viable since heavy sfermions suppress the proton decay via color-triplet Higgs
exchanges. At the same time, sizable flavor violation in sfermion masses is
still allowed by low-energy precision experiments when the mass scale is as
high as O(100) TeV, which naturally explains the 125 GeV Higgs mass. In the
presence of the sfermon flavor violation, however, the rates and branching
fractions of proton decay can be drastically changed. In this paper, we study
the effects of sfermion flavor structure on proton decay and discuss the
experimental constraints on sfermion flavor violation. We find that
proton-decay experiments may give us a valuable knowledge on sfermon flavor
violation, and by combining it with the results from other low-energy precision
experiments, we can extract insights to the structure of sfermion sector as
well as the underlying grand unification model.
