Details

Autor(en) / Beteiligte

• Petreczky, P.
• Weber, J. H.

Titel

Strong coupling constant and heavy quark masses in ( 2 + 1 )-flavor QCD

Ist Teil von

• Physical review. D, 2019-08, Vol.100 (3), p.1, Article 034519

Ort / Verlag

College Park: American Physical Society

Erscheinungsjahr

2019

Link zum Volltext

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• We present a determination of the strong coupling constant and heavy quark masses in (2+1)-flavor QCD using lattice calculations of the moments of the pseudoscalar quarkonium correlators at several values of the heavy valence quark mass with highly improved staggered quark action. We determine the strong coupling constant in the MS¯ scheme at four low-energy scales corresponding to mc, 1.5mc, 2mc, and 3mc, with mc being the charm quark mass. The novel feature of our analysis that up to 11 lattice spacings are used in the continuum extrapolations, with the smallest lattice spacing being 0.025 fm. We obtain ΛMS¯nf=3=298±16  MeV, which is equivalent to αs(μ=MZ,nf=5)=0.1159(12). For the charm and bottom quark masses in the MS¯ scheme, we obtain mc(μ=mc,nf=4)=1.265(10)  GeV and mb(μ=mb,nf=5)=4.188(37)  GeV.