Abstract
We present a perturbative calculation of the renormalization constants for the Δ B = 2 four-quark operators, which is needed to evaluate the bag parameters B B and B S in lattice QCD. The one-loop coefficients are calculated for the O(1/ M) NRQCD heavy quark action and the O( a)-improved Wilson action for light quark. Using these coefficients, which remove O(α s / aM) error, we reanalyze our previous calculation of the bag parameters.
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