Antonio Palazzo

Global analysis of three-flavor neutrino masses and mixings

We present a comprehensive phenomenological analysis of a vast amount of data from neutrino flavor oscillation and non-oscillation searches, performed within the standard scenario with three massive and mixed neutrinos, and with particular attention to subleading effects. The detailed results discussed in this review represent a state-of-the-art, accurate and up-to-date (as of August 2005) estimate of the three-neutrino mass-mixing parameters.

Neutrino masses and mixings: Status of known and unknown 3ν parameters

Abstract Within the standard 3ν 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 NO ν A 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 ( δ m 2 , | Δ m 2 | , sin 2 u2061 θ 12 , sin 2 u2061 θ 13 , sin 2 u2061 θ 23 ), and the status of the three remaining unknown parameters: the mass hierarchy [ sign ( ± Δ m 2 ) ], the θ 23 octant [ sign ( sin 2 u2061 θ 23 − 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 δ m 2 and sin 2 u2061 θ 12 , while the latest accelerator and atmospheric data induce a slight increase of | Δ m 2 | . Concerning the unknown parameters, we confirm the previous intriguing preference for negative values of sin u2061 δ (with best-fit values around sin u2061 δ ≃ − 0.9 ), but we find no statistically significant indication about the θ 23 octant or the mass hierarchy (normal or inverted). Assuming an alternative (so-called LEM) analysis of NO ν A data, some δ ranges can be excluded at > 3 σ , 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 ν e mass m β (in beta decay), and the effective Majorana mass m β β (in neutrinoless double beta decay).

Global constraints on absolute neutrino masses and their ordering

Within the standard three-neutrino framework, the absolute neutrino masses and their ordering (either normal, NO, or inverted, IO) are currently unknown. However, the combination of current data coming from oscillation experiments, neutrinoless double beta decay searches, and cosmological surveys, can provide interesting constraints for such unknowns in the sub-eV mass range, down to O(0.1) eV in some cases. We discuss current limits on absolute neutrino mass observables by performing a global data analysis, that includes the latest results from oscillation experiments, neutrinoless double beta decay bounds from the KamLAND-Zen experiment, and constraints from representative combinations of Planck measurements and other cosmological data sets. In general, NO appears to be somewhat favored with respect to IO at the level of ~2 sigma, mainly by neutrino oscillation data (especially atmospheric), corroborated by cosmological data in some cases. Detailed constraints are obtained via the chi^2 method, by expanding the parameter space either around separate minima in NO and IO, or around the absolute minimum in any ordering. Implications for upcoming oscillation and non-oscillation neutrino experiments, including beta-decay searches, are also discussed.

Observables sensitive to absolute neutrino masses: Constraints and correlations from world neutrino data

In the context of three-flavor neutrino mixing, we present a thorough study of the phenomenological constraints applicable to three observables sensitive to absolute neutrino masses: The effective neutrino mass in Tritium beta-decay

Evidence for Mikheyev-Smirnov-Wolfenstein effects in solar neutrino flavor transitions

({m}_{ensuremath{beta}})

KamLAND neutrino spectra in energy and time: Indications for reactor power variations and constraints on the georeactor

; the effective Majorana neutrino mass in neutrinoless double beta-decay

Degeneracy between θ23 octant and neutrino non-standard interactions at DUNE

({m}_{ensuremath{beta}ensuremath{beta}})

Current unknowns in the three-neutrino framework

; and the sum of neutrino masses in cosmology

The Drosophila mojavensis Bari3 transposon: distribution and functional characterization

(ensuremath{Sigma})

Functional Characterization of the Bari1 Transposition System

. We discuss the correlations among these variables which arise from the combination of all the available neutrino oscillation data, in both normal and inverse neutrino mass hierarchy. We set upper limits on