Hints of theta_13>0 from global neutrino data analysis
Abstract
Nailing down the unknown neutrino mixing angle theta_13 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 theta_13, 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of the XXIII International Conference on Neutrino Physics and Astrophysics, Christchurch, New Zealand, 2008 (unpublished)].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 theta_13>0, each at the level of ~1sigma: 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 sin^2(theta_13) = 0.016 +- 0.010 (1sigma), implying a preference for \theta_13>0 with non-negligible statistical significance (~90% C.L.). We discuss possible refinements of the experimental data analyses, which might sharpen such intriguing indication.
Cite
@article{arxiv.0806.2649,
title = {Hints of theta_13>0 from global neutrino data analysis},
author = {G. L. Fogli and E. Lisi and A. Marrone and A. Palazzo and A. M. Rotunno},
journal= {arXiv preprint arXiv:0806.2649},
year = {2010}
}
Comments
Minor changes in the text. Matches published version in PRL