CP violation in Bs mixing in the SUSY SU(5) GUT with right-handed neutrinos

It is recently announced by the UTfit Collaboration that the CP phase of the Bs mixing amplitude, ϕBs, deviates more than 3σ from the Standard Model prediction. In this Letter we discuss how large correction to ϕBs is possible in the supersymmetric SU(5) ground unified model (SUSY SU(5) GUT) with right-handed neutrinos. Here, we assume the supergravity-like boundary condition for the SUSY-breaking terms. We found that the 95% probability region derived by the UTfit Collaboration is marginal in this model.