Improving the precision of light quark mass determinations

Details Improving the precision of light quark mass determinations Improving the precision of light quark mass determinations

2009-10-19

arxiv.org/abs/0910.3437v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

5 pages, 3 figures, to be published in the proceedings of DPF-2009, Detroit, MI, July 2009, eConf C090726

Scientific paper

We discuss the concepts and the framework of the renormalization procedure in regularization-invariant momentum subtraction schemes. These schemes are used in the context of lattice simulations for the determination of physical quantities like light quark masses. We focus on the renormalization procedure with a symmetric subtraction point of a quark mass and discuss its conversion from the RI/SMOM scheme to the MSbar scheme. A symmetric subtraction point allows for a lattice calculation with a reduced contamination from infrared effects. The perturbative series for the resulting matching factor at next-to-leading order is better behaved for the symmetric momentum configuration than for the exceptional one which can decrease the uncertainty in light quark mass determinations.

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