27 Jul 2020 | Ivan Esteban, M. C. Gonzalez-Garcia, Michele Maltoni, Thomas Schwetz, Albert Zhou
The paper presents an updated global analysis of three-flavor neutrino oscillations based on the latest data from the Neutrino2020 conference. The analysis shows that previous hints for the neutrino mass ordering have significantly decreased, with normal ordering (NO) favored only at the 1.6σ level. When combined with the χ² map from Super-Kamiokande, the hint for NO is at 2.7σ. The CP-conserving value δ_CP = 180° is within 0.6σ of the global best fit. Only with inverted mass ordering (IO) is CP violation favored at ~3σ. The results are driven by new data from T2K and NOvA long-baseline experiments, and the relevance of LBL-reactor oscillation frequency complementarity is discussed. The previous 2.2σ tension in Δm²₂₁ favored by KamLAND and solar experiments is reduced to 1.1σ after including the latest Super-Kamiokande solar neutrino results. Updated allowed ranges for oscillation parameters and the leptonic Jarlskog determinant are presented. The analysis shows that the best fit remains for NO, though with reduced significance. The tension between solar and KamLAND results has decreased, with the best fit Δm²₂₁ for KamLAND now at 1.1σ. The CP phase δ_CP is found to be at 195°, with the allowed range pushed towards the CP-conserving value of 180°. The analysis also shows a mild preference for the second octant of θ₂₃. The results indicate that the hints for CP violation and neutrino mass ordering have faded, consistent with the fading away of fluctuations over time. The paper concludes that all involved data sets are statistically compatible under the hypothesis of three-flavor oscillations.The paper presents an updated global analysis of three-flavor neutrino oscillations based on the latest data from the Neutrino2020 conference. The analysis shows that previous hints for the neutrino mass ordering have significantly decreased, with normal ordering (NO) favored only at the 1.6σ level. When combined with the χ² map from Super-Kamiokande, the hint for NO is at 2.7σ. The CP-conserving value δ_CP = 180° is within 0.6σ of the global best fit. Only with inverted mass ordering (IO) is CP violation favored at ~3σ. The results are driven by new data from T2K and NOvA long-baseline experiments, and the relevance of LBL-reactor oscillation frequency complementarity is discussed. The previous 2.2σ tension in Δm²₂₁ favored by KamLAND and solar experiments is reduced to 1.1σ after including the latest Super-Kamiokande solar neutrino results. Updated allowed ranges for oscillation parameters and the leptonic Jarlskog determinant are presented. The analysis shows that the best fit remains for NO, though with reduced significance. The tension between solar and KamLAND results has decreased, with the best fit Δm²₂₁ for KamLAND now at 1.1σ. The CP phase δ_CP is found to be at 195°, with the allowed range pushed towards the CP-conserving value of 180°. The analysis also shows a mild preference for the second octant of θ₂₃. The results indicate that the hints for CP violation and neutrino mass ordering have faded, consistent with the fading away of fluctuations over time. The paper concludes that all involved data sets are statistically compatible under the hypothesis of three-flavor oscillations.