Aspects of determining fBs: scaling and power-law divergences
S. Collins, C. T. H. Davies, J. Hein, J. Shigemitsu, C. Morningstar, A. Ali Khan
Abstract
We present preliminary results for the decay constant of the Bs meson, fBs, at three values of beta=5.7, 6.0 and 6.2 using NRQCD and clover fermions for the heavy and light quarks respectively. As a consistency check the decay constant has also been extracted from the axial-vector current at finite momentum. In addition, we discuss the cancellation of O(alpha/(aM0)) terms and the remaining uncertainty in fBs from higher order divergences.
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