Strong coupling constant and quark masses from lattice QCD
Abstract
We review lattice determinations of the charm and bottom quark masses and the strong coupling constant obtained by different methods. We explain how effective field theory approaches, such as Non-Relativistic QCD (NRQCD), potential Non-Relativistic QCD (pNRQCD), Heavy Quark Effective Theory (HQET) and Heavy Meson rooted All-Staggered Chiral Perturbation Theory (HMrAS) can help in these determinations. After critically reviewing different lattice results we determine lattice world averages for the strong coupling constant, αs(MZ,Nf=5)=0.11803+0.00047-0.00068, as well as for the charm quark mass, mc(mc,Nf=4)=1.2735(35) GeV, and the bottom quark mass, mb(mb,Nf=5)=4.188(10) GeV. The above determinations are more precise than the ones obtained by Particle Data Group (PDG).