Poster presented by Marco Guagnelli
Topic: Improvement and Renormalization
The non-perturbatively renormalized scalar density with Wilson quarks
Abstract: Due to the absence of an exact chiral symmetry in lattice QCD with Wilson quarks, the iso-singlet scalar density has to be renormalized both additively and multiplicatively. We use chiral Ward identities between correlation functions derived from the Schr\"odinger functional to determine the relevant renormalization constants non-perturbatively in the quenched approximation. Combining the result with recent work by the Alpha collaboration on quark mass renormalization, we also obtain the relation between the bare lattice operator and the associated renormalization group invariant operator.