Further Precise Determinations of αs from Lattice QCD

We present a new determination of the strong coupling constant from lattice QCD simulations. We use four different short-distance quantities to obtain the coupling, three different (infrared) meson splittings to tune the simulation parameters, and a wide range of lattice spacings, quark masses, and lattice volumes to test for systematic errors. Our final result consists of ten different determinations of α P (8.2GeV), which agree well with each other and with our previous results. The most accurate of these, when evolved perturbatively to the Z mass, gives α MS (MZ)= .1174 (24). We compare our results with those obtained from other recent lattice simulations.