Hints of θ13>0 from Global Neutrino Data Analysis
Abstract
Nailing down the unknown neutrino mixing angle θ13 is one of the most important goals in current lepton physics. In this context, we perform a global analysis of neutrino oscillation data, focusing on θ13, and including recent results [Neutrino 2008, Proceedings of the XXIII International Conference on Neutrino Physics and Astrophysics, Christchurch, New Zealand, 2008 (unpublished)]. We discuss two converging hints of θ13>0, each at the level of ∼1σ: an older one coming from atmospheric neutrino data, and a newer one coming from the combination of solar and long-baseline reactor neutrino data. Their combination provides the global estimate sin2θ13=0.016±0.010(1σ), implying a preference for θ13>0 with non-negligible statistical significance (∼90% C.L.). We discuss possible refinements of the experimental data analyses, which might sharpen such intriguing indications.
- Publication:
-
Physical Review Letters
- Pub Date:
- October 2008
- DOI:
- 10.1103/PhysRevLett.101.141801
- arXiv:
- arXiv:0806.2649
- Bibcode:
- 2008PhRvL.101n1801F
- Keywords:
-
- 14.60.Pq;
- 26.65.+t;
- 28.50.Hw;
- 95.55.Vj;
- Neutrino mass and mixing;
- Solar neutrinos;
- Power and production reactors;
- Neutrino muon pion and other elementary particle detectors;
- cosmic ray detectors;
- High Energy Physics - Phenomenology;
- Astrophysics;
- High Energy Physics - Experiment;
- Nuclear Experiment
- E-Print:
- Minor changes in the text. Matches published version in PRL