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T: Fachverband Teilchenphysik
T 13: Theorie: QFT / Gittereichtheorie
T 13.4: Talk
Monday, March 19, 2018, 16:45–17:00, Z6 - SR 1.013
Non-perturbative improvement of quark mass renormalization in the small lattice spacing region of three-flavor lattice QCD — Patrick Fritzsch1, Jochen Heitger2, and •Simon Kuberski2 — 1Theoretical Physics Department, CERN, 1211 Geneva 23, Switzerland — 2Institut für Theoretische Physik, Westfälische Wilhelms-Universität Münster, Wilhelm-Klemm-Straße 9, D-48149 Münster, Germany
The use of Heavy Quark Effective Theory (HQET) on the lattice as an approach to B-physics phenomenology is based on a non-perturbative matching of HQET to QCD in finite volume. As a first step to apply the underlying strategy in the three-flavor (Nf = 2+1) theory, we determine the renormalization constant and improvement coefficients relating the renormalized current and subtracted quark mass of (quenched) valence quarks in O(a) improved Nf=3 lattice QCD. We present first results of our calculation for the relevant parameter region towards weak couplings along a line of constant physics, which corresponds to lattice resolutions a 0.02 fm and fixes the physical extent of the matching volume to L≈ 0.5 fm.