Speaker
Description
We present a non-perturbative determination of the renormalization constants of the non-singlet components of the QCD energy-momentum tensor on the lattice. The calculation is carried out with the Wilson plaquette gauge action and $N_f=3$ flavours of $O(a)$-improved Wilson fermions. The four independent renormalization constants, associated to the sextet and the triplet representations of the hypercubic group, are fixed by imposing lattice versions of continuum Ward identities in the presence of shifted and twisted boundary conditions. The resulting renormalization conditions involve only one-point functions of the energy-momentum tensor and can be implemented with high numerical precision. The renormalization constants are computed with percent-level accuracy for bare couplings in the range $0\leq g_0^2\leq 0.96$.