Non-perturbative determination of improvement coefficients $$b_\mathrm{m}$$ bm and $$b_\mathrm{A}-b_\mathrm{P}$$ bA-bP and normalisation factor $$Z_\mathrm{m}Z_\mathrm{P}/Z_\mathrm{A}$$ ZmZP/ZA with $$N_\mathrm{f}= 3$$ Nf=3 Wilson fermions

Abstract

Abstract We determine non-perturbatively the normalisation parameter $$Z_\mathrm{m}Z_\mathrm{P}/Z_\mathrm{A}$$ ZmZP/ZA as well as the Symanzik coefficients $$b_\mathrm{m}$$ bm and $$b_\mathrm{A}-b_\mathrm{P}$$ bA-bP , required in $$\mathrm{O}(a)$$ O(a) improved quark mass renormalisation with Wilson fermions. The strategy underlying their computation involves simulations in $$N_\mathrm{f}=3$$ Nf=3 QCD with $$\mathrm{O}(a)$$ O(a) improved massless sea and non-degenerate valence quarks in the finite-volume Schrödinger functional scheme. Our results, which cover the typical gauge coupling range of large-volume $$N_\mathrm{f}=2+1$$ Nf=2+1 QCD simulations with Wilson fermions at lattice spacings below $$0.1\,\mathrm{fm}$$ 0.1fm , are of particular use for the non-perturbative calculation of $$\mathrm{O}(a)$$ O(a) improved renormalised quark masses.