Hints of theta_13>0 from global neutrino data analysis

Details Hints of theta_13>0 from global neutrino data analysis Hints of theta_13>0 from global neutrino data analysis

2008-06-16

arxiv.org/abs/0806.2649v2

Phys.Rev.Lett.101:141801,2008

Physics

High Energy Physics

High Energy Physics - Phenomenology

Minor changes in the text. Matches published version in PRL

Scientific paper

10.1103/PhysRevLett.101.141801

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of the XXIII International Conference on Neutrino Physics and Astrophysics, Christchurch, New Zealand, 2008 (unpublished)].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.

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