Sterile neutrino oscillations: the global picture

  • Joachim Kopp
  • Pedro A. N. Machado
  • Michele Maltoni
  • Thomas Schwetz
Open Access
Article

Abstract

Neutrino oscillations involving eV-scale neutrino mass states are investigated in the context of global neutrino oscillation data including short and long-baseline accelerator, reactor, and radioactive source experiments, as well as atmospheric and solar neutrinos. We consider sterile neutrino mass schemes involving one or two mass-squared differences at the eV2 scale denoted by 3+1, 3+2, and 1+3+1. We discuss the hints for eV-scale neutrinos from \( \mathop{{{v_e}}}\limits^{{\left( - \right)}} \) disappearance (reactor and Gallium anomalies) and \( \mathop{{{v_{\mu }}}}\limits^{{\left( - \right)}}\to \mathop{{{v_e}}}\limits^{{\left( - \right)}} \) appearance (LSND and MiniBooNE) searches, and we present constraints on sterile neutrino mixing from \( \mathop{{{v_{\mu }}}}\limits^{{\left( - \right)}} \) and neutral-current disappearance data. An explanation of all hints in terms of oscillations suffers from severe tension between appearance and disappearance data. The best compatibility is obtained in the 1+3+1 scheme with a p-value of 0.2% and exceedingly worse compatibilities in the 3+1 and 3+2 schemes.

Keywords

Beyond Standard Model Neutrino Physics Solar and Atmospheric Neutrinos 

Copyright information

© SISSA 2013

Authors and Affiliations

  • Joachim Kopp
    • 1
  • Pedro A. N. Machado
    • 2
    • 3
  • Michele Maltoni
    • 4
  • Thomas Schwetz
    • 1
  1. 1.Max-Planck-Institut für KernphysikHeidelbergGermany
  2. 2.Instituto de FísicaUniversidade de São PauloSão PauloBrazil
  3. 3.Institut de Physique Théorique, CEA-SaclayGif-sur-YvetteFrance
  4. 4.Instituto de Física Teórica UAM/CSICMadridSpain

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