Repository KITopen (Karlsruhe Institute of Technology)· 2020
The fate of hints: updated global analysis of three-flavor neutrino oscillations
- 1,178citations
- 2020year
Short summary
New global analysis of neutrino oscillation data shows previous hints for neutrino mass ordering have significantly decreased, with normal ordering (NO) now favored at only the 1.6σ level (2.7σ with Super-Kamiokande atmospheric data).
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Key points
- Previous hints for neutrino mass ordering have decreased significantly, with normal ordering favored at 1.6σ (2.7σ with Super-Kamiokande atmospheric data).
- The CP conserving value δCP = 180° is within 0.6σ of the global best fit.
- New data from T2K and NOvA experiments are driving these results.
- Tension in ∆m²₂₁ previously favored by KamLAND and solar experiments is reduced to 1.1σ.
AI-generated from the title and abstract; the full text is not read.
Abstract
Our herein described combined analysis of the latest neutrino oscillation data presented at the Neutrino2020 conference shows that previous hints for the neutrino mass ordering have significantly decreased, and normal ordering (NO) is favored only at the 1.6σ level. Combined with the χ$^{2}$ map provided by Super-Kamiokande for their atmospheric neutrino data analysis the hint for NO is at 2.7σ. The CP conserving value δ$_{CP}$ = 180° is within 0.6σ of the global best fit point. Only if we restrict to inverted mass ordering, CP violation is favored at the ∼ 3σ level. We discuss the origin of these results — which are driven by the new data from the T2K and NOvA long-baseline experiments —, and the relevance of the LBL-reactor oscillation frequency complementarity. The previous 2.2σ tension in ∆m$^{2}$$_{21}$ preferred by KamLAND and solar experiments is also reduced to the 1.1σ level after the inclusion of the latest Super-Kamiokande solar neutrino results. Finally we present updated allowed ranges for the oscillation parameters and for the leptonic Jarlskog determinant from the global analysis.
The authors' abstract, as published at the source. Repository KITopen (Karlsruhe Institute of Technology), 2020 · DOI ↗
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Field: Nuclear and High Energy Physics
Nuclear and High Energy PhysicsPhysics and Astronomy