Like-Sign Dimuon Asymmetry of B0 Meson and LFV in SU(5) SUSY GUT with S4 Flavor Symmetry

Abstract

The like-sign dimuon charge asymmetry of the B meson, which was reported in the DØ Collaboration, is studied in the SU(5) SUSY GUT model with S4 flavor symmetry. Additional CP violating effects from the squark sector are discussed in Bs-Bs mixing process. The predicted like-sign charge asymmetry is in the 2σ range of the combined result of DØ and CDF measurements. Since the SUSY contributions in the quark sector affect to the lepton sector because of the SU(5) GUT relation, two predictions are given in the leptonic processes: (i) both BR(µ → eγ) and the electron EDM are close to the present upper bound, (ii) the decay ratios of τ decays, τ → µγ and τ → eγ, are related to each other via the Cabibbo angle λc: BR(τ → eγ)/BR(τ → µγ) ≃ λ2c. These are testable at future experiments.