Münster 2017 – scientific programme

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T: Fachverband Teilchenphysik

T 84: Gittereichtheorie

T 84.1: Talk

Wednesday, March 29, 2017, 16:45–17:00, VSH 11

Non-perturbative improvement and renormalization of quark bilinears in lattice QCD with three flavours — •Fabian Joswig¹, Jochen Heitger¹, Anastassios Vladikas², and Christian Wittemeier¹ — ¹Institut für Theoretische Physik, Universität Münster, Wilhelm-Klemm-Str. 9, 48149 Münster, Germany — ²INFN, Sezione di Tor Vergata, c/o Dipartimento di Fisica, Universitá di Roma Tor Vergata, Via della Ricerca Scientifica 1, I-00133 Rome, Italy

We report on calculations in lattice QCD with 3 flavours of Wilson-clover fermions and the tree-level Symanzik-improved gauge action, in order to non-perturbatively determine the improvement coefficient and the renormalization factor of the vector current. The improvement and renormalization conditions are derived from massive Ward identities, using Schrödinger functional boundary conditions, which also offer a method to extract the ratio of the scalar to pseudoscalar renormalization constants. Our computations are done along a line of constant physics with couplings corresponding to lattice spacings of about 0.09 fm and below, relevant for phenomenological applications.