An Estimate of alpha_S from Bottomonium in Unquenched QCD

Details An Estimate of alpha_S from Bottomonium in Unquenched QCD An Estimate of alpha_S from Bottomonium in Unquenched QCD

1998-09-16

arxiv.org/abs/hep-lat/9809130v1

Nucl.Phys.Proc.Suppl. 73 (1999) 327-329

Physics

High Energy Physics

High Energy Physics - Lattice

LATTICE98(heavyqk)

Scientific paper

10.1016/S0920-5632(99)85062-2

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.

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