Abstract
This talk summarizes the quenched calculation of f B and f B s presented in [1]. The heavy quark is simulated using an O(1/ M 2) improved NRQCD action, and the tadpole improved clover action is used for the light quarks. The axial current includes the O(1/ M) corrections in one-loop perturbation theory and the O(1/ M 2) ones at tree-level. We discuss the various systematic effects and consistency checks made in the calculation.
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