The fate of hints: updated global analysis of three-flavor neutrino oscillations

The fate of hints: updated global analysis of three-flavor neutrino oscillations

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, incorporating the latest data from the Neutrino2020 conference, particularly from the T2K and NOvA long-baseline (LBL) experiments. The analysis shows that previous hints for normal neutrino mass ordering (NO) and maximal CP violation have significantly decreased. The best fit remains for NO, but with reduced significance, and the hint for CP violation is within 1.6σ. The CP-conserving value δCP = 180° is within 0.6σ of the global best fit point. Inverted mass ordering (IO) is favored only at the 2.7σ level when combined with Super-Kamiokande atmospheric neutrino data. The tension in Δm²21 preferred by KamLAND and solar experiments has been reduced to 1.1σ after including the latest Super-Kamiokande solar neutrino results. The paper discusses the origin of these results, driven by new data from T2K and NOvA, and the relevance of LBL-reactor oscillation frequency complementarity. The analysis also updates the allowed ranges for oscillation parameters and the leptonic Jarlskog determinant.The paper presents an updated global analysis of three-flavor neutrino oscillations, incorporating the latest data from the Neutrino2020 conference, particularly from the T2K and NOvA long-baseline (LBL) experiments. The analysis shows that previous hints for normal neutrino mass ordering (NO) and maximal CP violation have significantly decreased. The best fit remains for NO, but with reduced significance, and the hint for CP violation is within 1.6σ. The CP-conserving value δCP = 180° is within 0.6σ of the global best fit point. Inverted mass ordering (IO) is favored only at the 2.7σ level when combined with Super-Kamiokande atmospheric neutrino data. The tension in Δm²21 preferred by KamLAND and solar experiments has been reduced to 1.1σ after including the latest Super-Kamiokande solar neutrino results. The paper discusses the origin of these results, driven by new data from T2K and NOvA, and the relevance of LBL-reactor oscillation frequency complementarity. The analysis also updates the allowed ranges for oscillation parameters and the leptonic Jarlskog determinant.
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