Nonperturbative renormalization in lattice QCD with three flavors of clover fermions: Using periodic and open boundary conditions

We present the nonperturbative computation of renormalization factors in the RI'−(S)MOM (regularization independent (symmetric) momentum subtraction) schemes for the QCD gauge field ensembles generated by the CLS (coordinated lattice simulations) effort with three flavors of nonperturbatively improved Wilson (clover) quarks. We use ensembles with the standard (anti-)periodic boundary conditions in the time direction as well as gauge field configurations with open boundary conditions. Besides flavor-nonsinglet quark-antiquark operators with up to two derivatives we also consider three-quark operators with up to one derivative. For the RI′−SMOM scheme results we make use of the recently calculated three-loop conversion factors to the ¯ MS scheme.