Updated fit to three neutrino mixing: status of leptonic CP violation

2014/09/30 by M. C. González-García, M. C. Gonzalez-Garcia, Michele Maltoni +1 · 28 citations
Physics and Astronomy · #Astrophysics and Cosmic Phenomena #CP violation #Electron #Lepton #Neutrino #Neutrino Physics Research #Neutrino oscillation #Nuclear physics #Octant (instrument) #Particle physics #Particle physics theoretical and experimental studies #Physics #Solar neutrino #Solar neutrino problem #Unitarity #hep-ex #hep-ph

paper · pdf · doi:10.1007/jhep11(2014)052

published as JHEP 1411:052, 2014 · 28 pages, 10 figures, 1 table. Typos corrected. Updated results of the global fit will be available at http://www.nu-fit.org/

openalex publication_date 2014/11/01 · arxiv created 2014/12/16 · arxiv updated 2014/12/17 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05

Abstract

We present a global analysis of solar, atmospheric, reactor and accelerator neutrino data in the framework of three-neutrino oscillations based on data available in summer 2014. We provide the allowed ranges of the six oscillation parameters and show that their determination is stable with respect to uncertainties related to reactor neutrino and solar neutrino flux predictions. We find that the maximal possible value of the Jarlskog invariant in the lepton sector is 0.033 ±0.010 (±0.027) at the 1σ (3σ) level and we use leptonic unitarity triangles to illustrate the ability of global oscillation data to obtain information on CP violation. We discuss “tendencies and tensions” of the global fit related to the octant of θ 23 as well as the CP violating phase δ CP. The favored values of δ CP are around 3π/2 while values around π/2 are disfavored at about Δχ2 ≃6. We comment on the non-trivial task to assign a confidence level to this Δχ 2 value by performing a Monte Carlo study of T2K data.

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