arXiv:hep-lat/0209122·v1·High Energy Physics — Lattice
The determination of alpha_s 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: alpha_s_MSbar(M_Z) = 0.121(3).
Comments: Lattice2002(heavyquark)