Speaker
Johannes Heinrich Weber
(Michigan State University)
Description
We revisit previous determination of the strong coupling constant from moments
of quarkonium correlators in (2+1)-flavor QCD. We use
previously calculated moments obtained with Highly Improved Staggered
Quark (HISQ) action for five different quark masses and several lattice spacings.
We perform a careful continuum extrapolations of the moments and from the comparison
of these to the perturbative result we determine the
QCD Lambda parameter, $\Lambda_{\overline{MS}}^{n_f=3}=332 \pm 17 \pm 2(scale)$ MeV. This
corresponds to $\alpha_s^{n_f=5}(\mu=M_Z)=0.1177(12)$.
Primary authors
Peter Petreczky
(BNL)
Johannes Heinrich Weber
(Michigan State University)
