The contribution of light Majorana neutrinos to neutrinoless double beta decay and cosmology

Abstract

Cosmology is making impressive progress and it is producing stringent bounds on the sum of the neutrino masses Σ, a parameter of great importance for the current laboratory experiments. In this letter, we exploit the potential relevance of the analysis of Palanque-Delabrouille et al. [JCAP 1502[JCAP , 045 (2015] to the neutrinoless double beta decay (0νββ) search. This analysis indicates small values for the lightest neutrino mass, since the authors find Σ < 84 meV at 1σ C. L., and provides a 1σ preference for the normal hierarchy. The allowed values for the Majorana effective mass, probed by 0νββ, turn out to be < 75 meV at 3σ C. L. and lower down to less than 20 meV at 1σ C. L. . If this indication is confirmed, the impact on the 0νββ experiments will be tremendous since the possibility of detecting a signal will be out of the reach of the next generation of experiments.

Evolution of Density Parameters on a Smooth Embedded Universe

“…[55][56][57] Similar results as shown in Figure 2 were obtained for solution γ − . It is important to point out that the value of z e can be larger as we consider the variation of the η 0 parameter in the range compatible with the accelerated expansion regime with 0.5 > η 0 ≥ 0.…”

Implications of δlCP~270° and Verma1 2016Advances in High Energy Physics5040View full textAdd to dashboardCite

“…These results are also supported by the preliminary results from the atmospheric neutrino experiment at Super-Kamiokande [28]. In addition, a statistical analysis of the cosmological data [29] also indicates preference for NO providing maximum likelihood for Majorana effective mass: that is,…”

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“…The left panel refers to separate fits in each mass ordering, while the right panel to the global fit in any ordering. The main features of the allowed bands have been discussed in previous literature (see [21,22,[98][99][100][101] and refs. therein) and are not repeated here.…”