The mass of the charm quark from unquenched lattice QCD at fixed lattice spacing

TL;DR

This paper estimates the charm quark mass using unquenched lattice QCD with two dynamical quark flavors, comparing results to quenched QCD at fixed lattice spacing, and finds no sea quark effects at the strange quark mass.

Contribution

It provides a new unquenched lattice QCD determination of the charm quark mass at fixed lattice spacing, comparing different quark mass formulations.

Findings

No observable sea quark effects at the strange quark mass.

Comparison between quenched and unquenched results at the same lattice spacing.

Preliminary results using multiple quark mass definitions.

Abstract

We determine the mass of the charm quark ($m_c$) from lattice QCD with two flavors of dynamical quarks with a mass around the strange quark. We compare this to a determination in quenched QCD which has the same lattice spacing (0.1 fm). We investigate different formulations of the quark mass, based on the Vector Ward Identity, PCAC relation and the FNAL heavy quark formalism. Based on these preliminary results we find no effects due to sea quarks with a mass around strange.