A new approach to quark mass determination using the gradient flow

Journal of High Energy Physics, vol. 2025

Abstract

A bstract We propose a new method to determine quark masses using ratios of the vacuum-expectation values ( vevs ) of flowed quark bilinear operators. They can be expressed as functions of the flow time t and the $$ \overline{\textrm{MS}} $$ MS ¯ quark mass $$ \overline{m} $$ m ¯ , which can then be determined by matching with the corresponding lattice results. Motivated by this, we evaluate these vevs perturbatively through next-to-leading order in the strong coupling. We provide the results as expansions in the limits of small and large $$ {\overline{m}}^2t $$ m ¯ 2 t . To this end, we develop a new expansion technique based on the Laplace transform. Additionally, we present numerical results with the exact mass dependence over a wide range of $$ {\overline{m}}^2t $$ m ¯ 2 t . We discuss the expected perturbative precision for the mass determination based on our next-to-leading order perturbative calculations, and possible non-perturbative corrections.

Authors 3

1. Hiromasa Takaura corresponding

   Kyoto University

   Affiliation as printed

   Kyoto University

2. Robert V. Harlander Aachen

   RWTH Aachen University

   Affiliation as printed

   RWTH Aachen University

3. Fabian Lange

   University of Zurich · Paul Scherrer Institute

   Affiliation as printed

   PSI Center for Neutron and Muon Sciences

   Universität Zürich