Non-perturbative calculation of Zm using Asqtad fermions
Abstract
We report progress on a non-perturbative calculation of the light quark mass renormalization factor Zm, using dynamical Asqtad fermions. This quantity is used to determine the light quark masses in the conventional MS-bar scheme. Such a non-perturbative determination of Zm removes uncertainties due to truncation of its perturbative expansion, currently known to two loops. These calculations have been carried out using publicly available MILC lattices with spacings of approximately 0.125 and 0.09 fm.
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