Within the standard 3 ν mass–mixing framework, we present an up-to-date global analysis of neutrino oscillation data (as of January 2016), including the latest available results from experiments with atmospheric neutrinos (Super-Kamiokande and IceCube DeepCore), at accelerators (first T2K ν‾ and NOνA ν runs in both appearance and disappearance modes), and at short-baseline reactors (Daya Bay and RENO far/near spectral ratios), as well as a reanalysis of older KamLAND data in the light of the “bump” feature recently observed in reactor spectra. We discuss improved constraints on the five known oscillation parameters ( δm2 , |Δm2| , sin2θ12 , sin2θ13 , sin2θ23 ), and the status of the three remaining unknown parameters: the mass hierarchy [ sign(±Δm2) ], the θ23 octant [ sign(sin2θ23−1/2) ], and the possible CP-violating phase δ . With respect to previous global fits, we find that the reanalysis of KamLAND data induces a slight decrease of both δm2 and sin2θ12 , while the latest accelerator and atmospheric data induce a slight increase of |Δm2| . Concerning the unknown parameters, we confirm the previous intriguing preference for negative values of sinδ (with best-fit values around sinδ≃−0.9 ), but we find no statistically significant indication about the θ23 octant or the mass hierarchy (normal or inverted). Assuming an alternative (so-called LEM) analysis of NOνA data, some δ ranges can be excluded at >3σ , and the normal mass hierarchy appears to be slightly favored at ∼90% C.L. We also describe in detail the covariances of selected pairs of oscillation parameters. Finally, we briefly discuss the implications of the above results on the three non-oscillation observables sensitive to the (unknown) absolute ν mass scale: the sum of ν masses Σ (in cosmology), the effective νe mass mβ (in beta decay), and the effective Majorana mass mββ (in neutrinoless double beta decay).
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"value": "Within the standard 3 \u03bd mass\u2013mixing framework, we present an up-to-date global analysis of neutrino oscillation data (as of January 2016), including the latest available results from experiments with atmospheric neutrinos (Super-Kamiokande and IceCube DeepCore), at accelerators (first T2K \u03bd\u203e and NO\u03bdA \u03bd runs in both appearance and disappearance modes), and at short-baseline reactors (Daya Bay and RENO far/near spectral ratios), as well as a reanalysis of older KamLAND data in the light of the \u201cbump\u201d feature recently observed in reactor spectra. We discuss improved constraints on the five known oscillation parameters ( \u03b4m2 , |\u0394m2| , sin2\u2061\u03b812 , sin2\u2061\u03b813 , sin2\u2061\u03b823 ), and the status of the three remaining unknown parameters: the mass hierarchy [ sign(\u00b1\u0394m2) ], the \u03b823 octant [ sign(sin2\u2061\u03b823\u22121/2) ], and the possible CP-violating phase \u03b4 . With respect to previous global fits, we find that the reanalysis of KamLAND data induces a slight decrease of both \u03b4m2 and sin2\u2061\u03b812 , while the latest accelerator and atmospheric data induce a slight increase of |\u0394m2| . Concerning the unknown parameters, we confirm the previous intriguing preference for negative values of sin\u2061\u03b4 (with best-fit values around sin\u2061\u03b4\u2243\u22120.9 ), but we find no statistically significant indication about the \u03b823 octant or the mass hierarchy (normal or inverted). Assuming an alternative (so-called LEM) analysis of NO\u03bdA data, some \u03b4 ranges can be excluded at >3\u03c3 , and the normal mass hierarchy appears to be slightly favored at \u223c90% C.L. We also describe in detail the covariances of selected pairs of oscillation parameters. Finally, we briefly discuss the implications of the above results on the three non-oscillation observables sensitive to the (unknown) absolute \u03bd mass scale: the sum of \u03bd masses \u03a3 (in cosmology), the effective \u03bde mass m\u03b2 (in beta decay), and the effective Majorana mass m\u03b2\u03b2 (in neutrinoless double beta decay)."
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