CP Violation in B_s Mixing in the SUSY SU(5) GUT with Right-handed Neutrinos

Understand

It is recently announced by the {\bf Ut}{\it fit} collaboration that the CP phase of the $B_s$ mixing amplitude, $\phi_{B_s}$, deviates more than $3 \sigma$ from the standard-model prediction.

• In this paper we discuss how large correction to $\phi_{B_s}$ 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 {\bf Ut}{\it fit} collaboration is marginal in this model.