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2019

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

Petreczky, P., Weber, J. H.

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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 pseudo-scalar quarkonium correlators at several values of the heavy valence quark mass with Highly Improved Staggered Quark (HISQ) action.

We determine the strong coupling constant in the $\overline{MS}$ scheme at four low-energy scales corresponding to $m_c$, $1.5m_c$, $2m_c$, and $3m_c$, with $m_c$ being the charm quark mass.
The novel feature of our analysis that up to eleven lattice spacings are used in the continuum extrapolations, with the smallest lattice spacing being $0.025$ fm.
We obtain $\Lambda_{\overline{MS}}^{n_f=3}=298 \pm 16$ MeV, which is equivalent to $\alpha_s(\mu=M_Z,n_f=5)=0.1159(12)$.

Strong coupling constant and heavy quark masses in 2+1 flavor QCD · Around

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