Abstract
We report on lattice calculations of the meson decay constant and the B-parameters using the NRQCD action for heavy quark. We performed a set of calculations at three lattice spacings in the quenched approximation in order to investigate the systematic uncertainty associated with the lattice discretization. Our results indicate that the systematic error is under good control for f_B and B_B. We also present preliminary results from our unquenched simulation.
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