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The like-sign dimuon charge asymmetry of the $B$ meson, which was reported inthe D$\O$ Collaboration, is studied in the SU(5) SUSY GUT model with $S_4$flavor symmetry. Additional CP violating effects from the squark sector arediscussed in $B_s-\bar B_s$ mixing process. The predicted like-sign chargeasymmetry is in the 2$\sigma$ range of the combined result of D$\O$ and CDFmeasurements. Since the SUSY contributions in the quark sector affect to thelepton sector because of the SU(5) GUT relation, two predictions are given inthe leptonic processes: (i) both ${\rm BR}(\mu \to e \gamma)$ and the electronEDM are close to the present upper bound, (ii) the decay ratios of $\tau$decays, $\tau \to \mu\gamma$ and $\tau \to e \gamma$, are related to each othervia the Cabibbo angle $\lambda_c$: ${\rm BR}(\tau \to e\gamma)/{\rm BR}(\tau\to \mu\gamma)\sime \lambda_c^2$. These are testable at future experiments.

Like-sign dimuon asymmetry of B0 meson and LFV in SU(5) SUSY GUT with S4 flavor symmetry