Four-neutrino spectrum from oscillation data
S.M. Bilenky, C. Giunti, W. Grimus, T. Schwetz
TL;DR
This paper constrains four-neutrino mass spectra using atmospheric and other neutrino oscillation data, favoring models with two pairs of close-mass neutrinos separated by about 1 eV.
Contribution
It demonstrates how combined oscillation data restricts the viable four-neutrino mass spectra, highlighting the preference for specific pairing schemes.
Findings
Two-neutrino pair schemes are favored by data.
Atmospheric asymmetry constrains neutrino mass configurations.
Models with separated mass gaps around 1 eV are supported.
Abstract
It is shown that the Super-Kamiokande atmospheric up--down asymmetry, together with the results of all other neutrino oscillation experiments, allows to constraint the possible spectra of four massive neutrinos. The two schemes with two pairs of neutrinos with close masses separated by a gap of about 1 eV are favored by the data.
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Taxonomy
TopicsNeutrino Physics Research · Astrophysics and Cosmic Phenomena · Particle physics theoretical and experimental studies