The effect of sea quarks on the mass of the charm quark from Lattice QCD
A. Dougall, C. M. Maynard, C. McNeile
TL;DR
This study calculates the charm quark mass using lattice QCD, comparing quenched and dynamical approaches, and finds no significant effect of sea quarks on the charm mass within the studied parameters.
Contribution
It provides a direct comparison of charm quark mass calculations in quenched and dynamical lattice QCD, highlighting the impact of sea quarks.
Findings
Charm quark mass in quenched QCD: 1.29(7)(13) GeV
No evidence of unquenching effects on charm mass
Continuum limit extrapolation from multiple lattice spacings
Abstract
We compute the mass of the charm quark using both quenched and dynamical lattice QCD calculations. We examine the effects of mass dependent lattice artifacts by comparing two different formalisms for the heavy quarks. We take the continuum limit of the charm mass in quenched QCD by extrapolating from three different lattice spacings. At a fixed lattice spacing, the mass of the charm quark is compared between quenched QCD and dynamical QCD with a sea quark mass around strange. In the continuum limit of quenched QCD, we find m_c(m_c)=1.29(7)(13) GeV. No evidence was seen for unquenching.
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