The determination of alphas from lattice QCD with 2+1 flavors of dynamical quarks
C. Davies, A. Gray, M. Alford, E. Follana, J. Hein, P. Lepage, Q. Mason, M. Nobes, J. Shigemit su, H. Trottier, M. Wingate
Abstract
We describe the first lattice determination of the strong coupling constant with 3 flavors of dynamical quarks. The method follows previous analyses in using a perturbative expansion for the plaquette and Upsilon spectroscopy to set the scale. Using dynamical configurations from the MILC collaboration with 2+1 flavors of dynamical quarks we are able to avoid previous problems of having to extrapolate to 3 light flavors from 0 and 2. Our results agree with our previous work: alphasMSbar(MZ) = 0.121(3).
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