TY  - JOUR
AU  - Spitz, A.
AU  - Hoeber, H.
AU  - Eicker, N.
AU  - Güsken, S.
AU  - Lippert, Th.
AU  - Schilling, K.
AU  - Struckmann, T.
AU  - Ueberholz, P.
AU  - Viehoff, J.
TI  - α S from Υ spectroscopy with dynamical Wilson fermions
JO  - Physical review / D
VL  - 60
IS  - 7
SN  - 0556-2821
CY  - Melville, NY
PB  - Inst.812068
M1  - FZJ-2019-01094
SP  - 074502
PY  - 1999
AB  - 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.
LB  - PUB:(DE-HGF)16
DO  - DOI:10.1103/PhysRevD.60.074502
UR  - https://juser.fz-juelich.de/record/860319
ER  -