arXiv:hep-lat/9809130·v1·High Energy Physics — Lattice
An Estimate of alpha_S from Bottomonium in Unquenched QCD
SESAM Collaboration: A.Spitz · N.Eicker · S.Guesken · H.Hoeber · P.Lacock · T.Lippert · K.Schilling · T.Struckmann · P.Ueberholz · J.Viehoff
Abstract
We estimate the strong coupling constant from the perturbative expansion of the plaquette. The scale is set by the 2S-1S and 1P-1S splittings in bottomonium which are computed in NRQCD on dynamical gauge configurations with nf=2 degenerate Wilson quarks at intermediate masses. We have increased the statistics of our spectrum calculation in order to reliably extrapolate in the sea-quark mass. We find a value of alpha_MS(m_Z) = 0.1118(26) which is somewhat lower than previous estimates within NRQCD.
Comments: LATTICE98(heavyqk)