A dynamical study of the chirally rotated Schrödinger functional in QCD

Abstract

The chirally rotated Schrödinger functional for Wilson-fermions allows for finite-volume, mass-independent renormalization schemes compatible with automatic O($a$) improvement. So far, in QCD, the set-up has only been studied in the quenched approximation. Here we present first results for $N_{\mathrm{f}}=2$ dynamical quark-flavours for several renormalization factors of quark-bilinears. We discuss how these renormalization factors can be easily obtained from simple ratios of two-point functions, and show how automatic O($a$) improvement is at work. As a by-product of this investigation the renormalization of the non-singlet axial current, $Z_A$, is determined very precisely.

Comments: Talk given at the 32nd International Symposium on Lattice Field Theory, 23-28 June, 2014, New York, US; LaTeX source, 7 pages, 6 figures