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We propose an $SO(10)$ supersymmetric grand unified theory (SUSY GUT), wherethe $SO(10)$ gauge symmetry breaks down to $SU(3)_c \times SU(2)_L \timesU(1)_Y\times U(1)_{X}$ at the GUT scale and $U(1)_X$ is radiatively broken atthe SUSY-braking scale. In order to achieve the observed Higgs mass around$126$ GeV and also to satisfy constraints on flavor- and/or CP-violatingprocesses, we assume that the SUSY-breaking scale is $O(100)$ TeV, so that the$U(1)_X$ breaking scale is also $O(100)$ TeV. One big issue in the SO(10) GUTsis how to realize realistic Yukawa couplings. In our model, not only ${\bf16}$-dimensional but also ${\bf 10}$-dimensional matter fields are introducedto predict the observed fermion masses and mixings. The Standard-Model quarksand leptons are linear combinations of the ${\bf 16}$- and ${\bf10}$-dimensional fields so that the $U(1)_{X}$ gauge interaction may beflavor-violating. We investigate the current constraints on theflavor-violating $Z'$ interaction from the flavor physics and discuss prospectsfor future experiments.

Flavor violating $Z'$ from $SO(10)$ SUSY GUT in High-Scale SUSY