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arXiv · 1802.10097

A new leading contribution to neutrinoless double-beta decay

V. Cirigliano·W. Dekens·J. de Vries·M. L. Graesser·E. Mereghetti·S. Pastore·U. van Kolck
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Abstract

Within the framework of chiral effective field theory we discuss the leading contributions to the neutrinoless double-beta decay transition operator induced by light Majorana neutrinos. Based on renormalization arguments in both dimensional regularization with minimal subtraction and a coordinate-space cutoff scheme, we show the need to introduce a leading-order short-range operator, missing in all current calculations. We discuss strategies to determine the finite part of the short-range coupling by matching to lattice QCD or by relating it via chiral symmetry to isospin-breaking observables in the two-nucleon sector. Finally, we speculate on the impact of this new contribution on nuclear matrix elements of relevance to experiment.

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V. Cirigliano, W. Dekens, J. de Vries, M. L. Graesser, E. Mereghetti, S. Pastore, U. van Kolck. 2018-02-27. A new leading contribution to neutrinoless double-beta decay. https://doi.org/10.1103/physrevlett.120.202001

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