Global constraints on absolute neutrino masses and their ordering

By Francesco Capozzi, E. di Valentino, E. Lisi, A. Marrone, A. Melchiorri, A. Palazzo. 2017

369 citations recorded by the source corpus.

Within the standard three-neutrino framework, the absolute neutrino masses and their ordering (either normal, NO, or inverted, IO) are currently unknown. However, the combination of current data coming from oscillation experiments, neutrinoless double beta ($0\ensuremath{\nu}\ensuremath{\beta}\ensuremath{\beta}$) decay searches, and cosmological surveys, can provide interesting constraints for such unknowns in the sub-eV mass range, down to $O({10}^{\ensuremath{-}1})\text{ }\text{ }\mathrm{eV}$ in some cases. We discuss current limits on absolute neutrino mass observables by performing a global data analysis that includes the latest results from oscillation experiments, $0\ensuremath{\nu}\ensuremath{\beta}\ensuremath{\beta}$ decay bounds from the KamLAND-Zen experiment, and constraints from representative combinations of Planck measurements and other cosmological data sets. In general, NO appears to be somewhat favored with respect to IO at the level of $\ensuremath{\sim}2\ensuremath{\sigma}$, mainly by neutrino oscillation data (especially atmospheric), corroborated by cosmological data in some cases. Detailed constraints are obtained via the ${\ensuremath{\chi}}^{2}$ method, by expanding the parameter space either around separate minima in NO and IO or around the absolute minimum in any ordering. Implications for upcoming oscillation and nonoscillation neutrino experiments, including $\ensuremath{\beta}$-decay searches, are also discussed.

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/a9c05730d4ca38cd605d70ceeaadec84f042ec00

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Citations in the corpus

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The Simons Observatory: science goals and forecasts (2018, background): “…latter combination of data would enable a 3.5σ detection of Σmν = 0.06 eV (the minimal summed mass allowed in the case of normal mass hierarchy; Capozzi et al. 2017; Esteban et al. 2017; de Salas et al. 2018) and a 5.9σ detection of Σmν = 0.1 eV (the minimal summed mass in the case of…”
Neutrino physics with the PTOLEMY project: active neutrino properties and the light sterile case (2019, background): “When all relevant neutrino oscillation experiments are combined in a global fit, the preference rises up to ∼ 3σ [10, 12, 13].”
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Current unknowns in the three-neutrino framework (2018, methodology): “With respect to [1] and also to more recent analyses [34, 35] we now use official χ(2) maps provided by experimental collaborations for some data sets (including short-baseline reactor and atmospheric neutrinos) that are difficult to reproduce by external users, and discuss pros and cons of this cho”
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Constraints on the sum of the neutrino masses in dynamical dark energy models with w(z)≥−1 are tighter than those obtained in ΛCDM (2018, methodology): “Indeed, we remind that alternative approaches can be adopted to quantify the statistical preference for the neutrino mass ordering [74, 150, 159].”