A Precise Determination of $α_s$ from Lattice QCD

Details A Precise Determination of $α_s$ from Lattice QCD A Precise Determination of $α_s$ from Lattice QCD

1994-08-20

arxiv.org/abs/hep-ph/9408328v2

Phys.Lett. B345 (1995) 42-48

Physics

High Energy Physics

High Energy Physics - Phenomenology

11 pages (LaTeX), OHSTPY-HEP-T-94-013, FSU-SCRI-94-79 (includes minor corrections in tables, additional references)

Scientific paper

10.1016/0370-2693(94)01598-7

We present a new determination of the QCD strong coupling constant based on precise lattice calculations of the $\Upsilon$ spectrum. The largest systematic uncertainty in previous such determinations resulted from the absence of vacuum polarization from light quarks. We substantially reduce this error by including two flavors of dynamical light quarks and extrapolating to three. We find $\alphathree_\V(8.2~\GeV) = 0.196(3)$ for three light flavors, corresponding to $\alphafive_\msbar(M_Z) = 0.115(2)$. This is significantly more accurate than previous determinations using this or any other technique.

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