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Toward the discovery of matter creation with neutrinoless double-beta decay

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arxiv 2202.01787 v2 pith:G2WJUXZY submitted 2022-02-03 hep-ex hep-phhep-thnucl-exnucl-th

classification hep-exhep-phhep-thnucl-exnucl-th
keywords decaydiscoverydouble-betaneutrinolessnucleartheoryneutrinosparticle
verification ladder T0 review T1 audit T2 compute T3 formal

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The discovery of neutrinoless double-beta decay could soon be within reach. This hypothetical ultra-rare 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 anti-neutrinos 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 double-beta 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 double-beta decay, to explore the path toward - and beyond - its discovery.

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Cited by 18 Pith papers

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