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000860319 0247_ $$2ISSN$$a1089-4918
000860319 0247_ $$2ISSN$$a1538-4500
000860319 0247_ $$2ISSN$$a1550-2368
000860319 0247_ $$2ISSN$$a1550-7998
000860319 0247_ $$2ISSN$$a2470-0010
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000860319 1001_ $$0P:(DE-HGF)0$$aSpitz, A.$$b0
000860319 245__ $$aα S from Υ spectroscopy with dynamical Wilson fermions
000860319 260__ $$aMelville, NY$$bInst.812068$$c1999
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000860319 520__ $$aWe 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.
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000860319 7001_ $$0P:(DE-HGF)0$$aSchilling, K.$$b5
000860319 7001_ $$0P:(DE-HGF)0$$aStruckmann, T.$$b6
000860319 7001_ $$0P:(DE-HGF)0$$aUeberholz, P.$$b7
000860319 7001_ $$0P:(DE-HGF)0$$aViehoff, J.$$b8
000860319 77318 $$2Crossref$$3journal-article$$a10.1103/physrevd.60.074502$$b : American Physical Society (APS), 1999-09-03$$n7$$p074502$$tPhysical Review D$$v60$$x0556-2821$$y1999
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