%0 Journal Article
%A Spitz, A.
%A Hoeber, H.
%A Eicker, N.
%A Güsken, S.
%A Lippert, Th.
%A Schilling, K.
%A Struckmann, T.
%A Ueberholz, P.
%A Viehoff, J.
%T α S from Υ spectroscopy with dynamical Wilson fermions
%J Physical review / D
%V 60
%N 7
%@ 0556-2821
%C Melville, NY
%I Inst.812068
%M FZJ-2019-01094
%P 074502
%D 1999
%X We estimate the QCD coupling constant from a lattice calculation of the bottomonium spectrum. The second order perturbative expansion of the plaquette expectation value is employed to determine αS at a scale set by the 2S−1S and 1P−1S level splittings. The latter are computed in NRQCD in a dynamical gauge field background with two degenerate flavors of Wilson quarks at intermediate masses and extrapolated to the chiral limit. Combining the Nf=2 result with the quenched result at equal lattice spacing we extrapolate to the physical number of light flavors to find a value of α(5)¯MS(mZ)=0.1118(17). The error quoted covers both statistical and systematic uncertainties in the scale determination. An additional 5% uncertainty comes from the choice of the underlying sea quark formulation and from truncation errors in perturbative expansions.
%F PUB:(DE-HGF)16
%9 Journal Article
%R 10.1103/PhysRevD.60.074502
%U https://juser.fz-juelich.de/record/860319