Update: Accurate Determinations of $α_s$ from Realistic Lattice QCD

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  • 10 July 2008
Abstract
We use lattice QCD simulations, with MILC configurations (including vacuum polarization from u, d, and s quarks), to update our previous determinations of the QCD coupling constant. Our new analysis uses results from 5 different lattice spacings and 11 different combinations of sea-quark masses to significantly reduce our previous errors. We also correct for finite-lattice-spacing errors in the scale setting, and for nonperturbative chiral corrections to the 22 short-distance quantities from which we extract the coupling. Our final result is alpha_V(7.5GeV,nf=3) = 0.2121(25), which is equivalent to alpha_msbar(M_Z,n_f=5)= 0.1183(7). We compare this with our previous result, which is about one standard deviation lower.

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