Chiral two-body currents in nuclei: Gamow-Teller transitions and   neutrinoless double-beta decay
  We show that chiral effective field theory (EFT) two-body currents provide important contributions to the quenching of low-momentum-transfer Gamow-Teller transitions, and use chiral EFT to predict the momentum-transfer dependence that is probed in neutrinoless double-beta decay. We then calculate for the first time the neutrinoless double-beta decay operator based on chiral EFT currents and study the nuclear matrix elements at successive orders. The contributions from chiral two-body currents are significant and should be included in all calculations. 
J. Men\'endez, D. Gazit and A. Schwenk
nucl-th hep-ph nucl-ex