CP violating lepton asymmetry from B decays in supersymmetric grand unified theories

We investigate the effect of the dimuon CP asymmetry from the B decay modes, recently observed at 3.2σ deviation from the standard model (SM) by the D0 Collaboration, in the context of SU(5) and SO(10) grand unified theory models. We exhibit that a large amount of flavor violation between the second and the third generation is generated due to the large neutrino atmospheric mixing angle and this flavor violation can be responsible for the large CP asymmetry, i.e., asls=(-12.7±5.0)x10-3 (assuming 2σ error in the prediction of the standard model value of Γ12s/M12s and error in the lattice measurements of BBsfBs2) due to the presence of new phases which are not present in the Cabibbo-Kobayashi-Maskawa matrix in the Yukawa couplings. We also study the implication of the parameter space in these grand unified theory models with large CP violating lepton asymmetry for different phenomenologies, e.g., Br(τ→μγ), Br(Bs→μμ) at the Fermilab, direct detection of dark matter in the ongoing detectors, and measurement of muon flux from solar neutrinos at the IceCube experiment.