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Open AccessJournal ArticleDOI

Measurement of Day and Night Neutrino Energy Spectra at SNO and Constraints on Neutrino Mixing Parameters

Q. R. Ahmad, +205 more
- 01 Jul 2002 - 
- Vol. 89, Iss: 1, pp 011302-011302
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TLDR
The Sudbury Neutrino Observatory (SNO) has measured day and night solar neutrino energy spectra and rates, and a global solar neutRino analysis in terms of matter-enhanced oscillations of two active flavors strongly favors the large mixing angle solution.
Abstract
The Sudbury Neutrino Observatory (SNO) has measured day and night solar neutrino energy spectra and rates. For charged current events, assuming an undistorted 8B spectrum, the night minus day rate is 14.0%+/-6.3%(+1.5%)(-1.4%) of the average rate. If the total flux of active neutrinos is additionally constrained to have no asymmetry, the nu(e) asymmetry is found to be 7.0%+/-4.9%(+1.3%)(-1.2%). A global solar neutrino analysis in terms of matter-enhanced oscillations of two active flavors strongly favors the large mixing angle solution.

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The νMSM, dark matter and baryon asymmetry of the universe

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The pre-big bang scenario in string cosmology

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Status of global fits to neutrino oscillations

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Underlying A4 symmetry for the neutrino mass matrix and the quark mixing matrix

TL;DR: The discrete non-Abelian symmetry A 4, valid at some high-energy scale, naturally leads to three degenerate neutrino masses, without spoiling the hierarchy of charged-lepton masses as discussed by the authors.
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