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Toward the discovery of matter creation with neutrinoless ββ decay
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The discovery of neutrinoless decay could soon be within reach. This hypothetical ultrarare nuclear decay offers a privileged portal to physics beyond the standard model of particle physics. Its observation would constitute the discovery of a matter-creating process, corroborating leading theories of why the Universe contains more matter than antimatter, and how forces unify at high energy scales. It would also prove that neutrinos and antineutrinos are not two distinct particles but can transform into each other, with their mass described by a unique mechanism conceived by Majorana. The recognition that neutrinos are not massless necessitates an explanation and has boosted interest in neutrinoless decay. The field stands now at a turning point. A new round of experiments is currently being prepared for the next decade to cover an important region of parameter space. In parallel, advances in nuclear theory are laying the groundwork to connect the nuclear decay with the underlying new physics. Meanwhile, the particle theory landscape continues to find new motivations for neutrinos to be their own antiparticle. This review brings together the experimental, nuclear theory, and particle theory aspects connected to neutrinoless decay to explore the path toward, and beyond, its discovery.
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AGOSTINI, M., BENATO, G., DETWILER, J., MENÉNDEZ SÁNCHEZ, Javier, VISSANI, F.. Toward the discovery of matter creation with neutrinoless ββ decay. _Reviews of Modern Physics_. 2023. Vol. 95, núm. 1-77. [consulta: 28 de gener de 2026]. ISSN: 0034-6861. [Disponible a: https://hdl.handle.net/2445/215834]