EDMs in SUSY GUTs

SUSY GUTs may predict rich flavor violation, and the signature may be observable in the low-energy flavor physics. The SUSY breaking terms in the minimal supersymmetric standard model (MSSM) are sensitive to physics beyond the MSSM. When the origin of the SUSY breaking terms in the MSSM comes from dynamics around or above the GUT scale, the interactions in the SUSY GUTs may bring down the signature on the SUSY breaking terms. In the MSSM the sizable flavor-violating SUSY breaking (FVSB) terms for the left-handed squarks are induced by the large top-quark Yukawa coupling, and those for the left-handed sleptons may be also generated by the neutrino Yukawa interaction in the SUSY seesaw mechanism. In the SUSY GUTs the FVSB terms for those SU(5) partners, the right-handed squarks and sleptons, are generated. This gives a chance to probe the interactions at the GUT scale by the low-energy flavor-changing processes, such as the K–K 0 mixing, the B physics, and the lepton flavor violation. The hadronic and leptonic electric dipole moments (EDMs) are sensitive to beyond the SM since the SM contributions are suppressed. In the MSSM the one-loop diagrams of SUSY particles may contribute to them. The EDMs are flavor-conserving observables, however, they are sensitive to the FVSB in the internal lines of the loop diagrams. Especially, when both left-handed and right-handed squarks or sleptons have the FVSB terms with the CP phases, the EDMs are enhanced by the heavier fermion mass. Thus, the EDMs are good probes for the SUSY GUTs. In this paper we review the prediction of the hadronic and leptonic EDMs in the SUSY GUTs, and the implication to the other observables in the models.