Effects of Chiral Two-Body Currents on Neutrinoless Double-Beta Decay Matrix Elements

Two-body currents in chiral effective field theory, including both one-pion-exchange and contact terms, are taken into account to correct the transition operator for neutrinoless double-beta decay. We compare the normal-ordering approximation with a more complete treatment of the many-body decay operator for the decay of $^{48}$Ca, $^{76}$Ge, and $^{82}$Se, in various nuclear-structure models. We discuss whether two-body currents quench neutrinoless decay as much as its two-neutrino counterpart.