Journal of High Energy Physics

, 2014:52 | Cite as

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

  • M. C. Gonzalez-Garcia
  • Michele Maltoni
  • Thomas Schwetz
Open Access
Regular Article - Theoretical Physics


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.


Neutrino Physics Solar and Atmospheric Neutrinos 


Open Access

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Copyright information

© The Author(s) 2014

Authors and Affiliations

  • M. C. Gonzalez-Garcia
    • 1
    • 2
  • Michele Maltoni
    • 3
  • Thomas Schwetz
    • 4
  1. 1.Institució Catalana de Recerca i Estudis Avançats (ICREA), Departament d’Estructura i Constituents de la Matèria and Institut de Ciencies del CosmosUniversitat de BarcelonaBarcelonaSpain
  2. 2.C.N. Yang Institute for Theoretical PhysicsState University of New York at Stony BrookStony BrookU.S.A.
  3. 3.Instituto de Física Teórica UAM/CSICUniversidad Autónoma de MadridMadridSpain
  4. 4.Oskar Klein Centre for Cosmoparticle Physics, Department of PhysicsStockholm UniversityStockholmSweden

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