Strong coupling constant from moments of quarkonium correlators revisited

We revisit previous determination of the strong coupling constant from moments of quarkonium correlators in (2 + 1)-flavor QCD. We use previously calculated moments obtained with Highly Improved Staggered Quark (HISQ) action for five different quark masses and several lattice spacings. We perform a careful continuum extrapolations of themoments and from the comparison of these to the perturbative result we determine the QCD Lambda parameter, Lambda(nf =3)/MS = 332 +/- 17 +/- 2(scale) MeV. This corresponds to an alpha = (nf=5)(s) (mu = M-Z) = 0.1177(12).

Automated summary

This study revisits the previous determination of the strong coupling constant using moments of quarkonium correlators. The moments were calculated using Highly Improved Staggered Quark (HISQ) action for different quark masses and lattice spacings. The QCD Lambda parameter was determined by carefully extrapolating the moments and comparing them to the perturbative result.