Lattice measurement of the couplings ginfinity and gBstarBpi
Abstract
We present the results of a quenched lattice QCD study of the coupling ghat, in the static heavy quark limit. After combining this with our previous results obtained by using propagating heavy quarks with a mass around the physical charm quark, we are able to interpolate to the b-quark sector. Our results are ghatinfinity = 0.48 +/- 0.03 +/- 0.11, ghatb = 0.58 +/- 0.06 +/- 0.10, and gBstar Bp = 47 +/- 5 +/- 8.
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