期刊
PHYSICAL REVIEW C
卷 100, 期 5, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevC.100.055504
关键词
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资金
- LDRD program at Los Alamos National Laboratory
- DOE topical collaboration on Nuclear Theory for Double Beta Decay and Fundamental Symmetries
- U.S. DOE, Office of Science, Office of Nuclear Physics, Office of High Energy Physics [DE-FG0204ER41338, DE-SC0009919, DE-AC52-06NA25396, DE-AC02-06CH11357]
- NUCLEI SciDAC program
- NUCLEI INCITE program
- European Union Research and Innovation program Horizon 2020 [654002]
- RHIC Physics Fellow Program of the RIKEN BNL Research Center
The process at the heart of neutrinoless double-beta decay, nn -> pp e(-) e(-) induced by a light Majorana neutrino, is investigated in pionless and chiral effective field theory. We show in various regularization schemes the need to introduce a short-range lepton-number-violating operator at leading order, confirming earlier findings. We demonstrate that such a short-range operator is only needed in spin-singlet S-wave transitions, while leading-order transitions involving higher partial waves depend solely on long-range currents. Calculations are extended to include next-to-leading-order corrections in perturbation theory, where to this order no additional undetermined parameters appear. We establish a connection based on chiral symmetry between neutrinoless double-beta decay and nuclear charge-independence breaking induced by electromagnetism. Data on the latter confirm the need for a leading-order short-range operator but do not allow for a full determination of the corresponding lepton-number-violating coupling. Using a crude estimate of this coupling, we perform ab initio calculations of the matrix elements for neutrinoless double-beta decay for He-6 and Be-12. We speculate on the phenomenological impact of the leading short-range operator on the basis of these results.
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