Chiral two-body currents in nuclei: Gamow-Teller transitions and neutrinoless double-beta decay

Abstract

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.

arXiv comment4 pages, 3 figures; improved version, with clarifications and added references

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