The discovery of neutrinoless β β decay could soon be within reach. This hypothetical
ultrarare nuclear decay offers a privileged portal to physics beyond the standard model of …

The discovery of neutrino masses through the observation of oscillations boosted the
importance of neutrinoless double beta decay (0νββ). In this paper, we review the main …

The Review summarizes much of particle physics and cosmology. Using data from previous
editions, plus 2,873 new measurements from 758 papers, we list, evaluate, and average …

We review the particle physics aspects of neutrino-less double beta decay. This process can
be mediated by light massive Majorana neutrinos (standard interpretation) or by something …

This paper is a review of the present status of neutrino mass physics, which grew out of an
APS sponsored study of neutrinos in 2004. After a discussion of the present knowledge of …

▪ Abstract The motivation, present status, and future plans of the search for ββ (0ν) decay are
reviewed. Recent observations of neutrino oscillations encourage the hope that ββ (0ν) …

Measurements of various features of the fluxes of atmospheric and solar neutrinos have
provided evidence for neutrino oscillations and therefore for neutrino masses and mixing …

In the Standard Model the total lepton number is conserved. Thus, neutrinoless double-β
decay, in which the total lepton number is violated by two units, is a probe of physics beyond …

The Large Hadron Collider has the potential to probe the scale of left-right symmetry
restoration and the associated lepton number violation. Moreover, it offers the hope of …

This biennial Review summarizes much of particle physics. Using data from previous
editions, plus 2158 new measurements from 551 papers, we list, evaluate, and average …