There is a
short review article at the Particle Data Group. And there is a fairly well written
Wikipedia article on the topic, together with the references that it cites, which is probably the best place to start.
Most of the details are spelled out in a summary manner as background in this
March 11, 2021 preprint at pages 2-6. And, two references in that paper provide a more in depth analysis (with the
arXiv open access preprint number in square brackets at the end of each citation):
* F. F. Deppisch, M. Hirsch and H. Pas, Neutrinoless Double Beta Decay and Physics Beyond the Standard Model, J. Phys. G 39 (2012) 124007, [1208.0727], and
* M. J. Dolinski, A. W. P. Poon and W. Rodejohann, Neutrinoless Double-Beta Decay: Status and Prospects, Ann. Rev. Nucl. Part. Sci. 69 (2019) 219–251, [1902.04097].
[Mentors' note: A digression sparked by the wikipedia reference has been moved to a thread in General Discussion]