Neutrino Mass Ordering from Oscillations and Beyond: 2018 Status and Future Prospects

By P. F. de Salas, Stefano Gariazzo, O. Mena, C. Ternes, M. Tórtola. Frontiers in Astronomy and Space Sciences, 2018

181 citations recorded by the source corpus.

The ordering of the neutrino masses is a crucial input for a deep understanding of flavor physics, and its determination may provide the key to establish the relationship among the lepton masses and mixings and their analogous properties in the quark sector. The extraction of the neutrino mass ordering is a data-driven field expected to evolve very rapidly in the next decade. In this review, we both analyze the present status and describe the physics of subsequent prospects. Firstly, the different current available tools to measure the neutrino mass ordering are described. Namely, reactor, long-baseline (accelerator and atmospheric) neutrino beams, laboratory searches for beta and neutrinoless double beta decays and observations of the cosmic background radiation and the large scale structure of the universe are carefully reviewed. Secondly, the results from an up-to-date comprehensive global fit are reported: the Bayesian analysis to the 2018 publicly available oscillation and cosmological data sets provides strong evidence for the normal neutrino mass ordering versus the inverted scenario, with a significance of 3.5 standard deviations. This preference for the normal neutrino mass ordering is mostly due to neutrino oscillation measurements. Finally, we shall also emphasize the future perspectives for unveiling the neutrino mass ordering. In this regard, apart from describing the expectations from the aforementioned probes, we also focus on those arising from alternative and novel methods, as 21 cm cosmology, core-collapse supernova neutrinos and the direct detection of relic neutrinos.

Subfields: Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/716c0023f09fd82989ac2c63560a401602371207

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Citations in the corpus

2020 global reassessment of the neutrino oscillation picture (2020, methodology): “[84], due to the mismatch in the determination of δ by T2K and NOνA, as already explained.”
New physics in light of the H0 tension: An alternative view (2019, unknown): “[245] P.”
Neutrino physics with the PTOLEMY project: active neutrino properties and the light sterile case (2019, background): “In terms of its logarithm, the preference for NO is equivalent to a 3σ probability against IO if lnBN̂O NO,IO ' 6, to 4σ if lnBN̂O NO,IO ' 10 or to & 5σ if lnBN̂O NO,IO & 15 [6].”
The fate of hints: updated global analysis of three-flavor neutrino oscillations (2020, background): “Global fits to neutrino oscillation data in the last several years have shown persistent hints for the normal neutrino mass ordering and values of the CP phase δCP around maximal CP violation [1–6].”
Towards a precision calculation of $N_{\rm eff}$ in the Standard Model II: Neutrino decoupling in the presence of flavour oscillations and finite-temperature QED (2020, unknown): “, normal ordering) marginally [32–35, 51, 52].”
Updated results on neutrino mass and mass hierarchy from cosmology with Planck 2018 likelihoods (2019, methodology): “From the Bayesian analysis of neutrino oscillations data in [52], we see that ln(BNH/IH) = 6.”