  Motivated by the recent measurements of the B_s-\bar{B}_s mass difference
from the D0 and CDF collaborations, we probe new physics effects in the
B_q-\bar{B}_q mixing within the context of the supersymmetric grand unified
model (SUSY GUT). We find that new physics effects in B_{s(d)}-\bar{B}_{s(d)}
mixing lead to the correlated information in the branching fractions of the
lepton flavor violating decays, which may serve as a test of the SUSY GUT. We
also discuss the implication of such new physics effects on the quark-lepton
complementarity in the neutrino mixings.
