The determination of alpha <sub> s</sub> from lattice QCD with 2+1 flavors of dynamical quarks
- Davies, C.
- Gray, A.
- Alford, M.
- Follana, E.
- Hein, J.
- Lepage, P.
- Mason, Q.
- Nobes, M.
- Shigemitsu, J.
- Trottier, H.
- Wingate, M.
DOIAbstract
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 result agrees with our previous work: alpha /sub theta //sup MS/(Mz) = 0.121(3)
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