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Updated global analysis of neutrino oscillations in the presence of eV-scale sterile neutrinos

  • Mona DentlerEmail author
  • Álvaro Hernández-Cabezudo
  • Joachim Kopp
  • Pedro Machado
  • Michele Maltoni
  • Ivan Martinez-Soler
  • Thomas Schwetz
Open Access
Regular Article - Theoretical Physics

Abstract

We discuss the possibility to explain the anomalies in short-baseline neutrino oscillation experiments in terms of sterile neutrinos. We work in a 3 + 1 framework and pay special attention to recent new data from reactor experiments, IceCube and MINOS+. We find that results from the DANSS and NEOS reactor experiments support the sterile neutrino explanation of the reactor anomaly, based on an analysis that relies solely on the relative comparison of measured reactor spectra. Global data from the νe disappearance channel favour sterile neutrino oscillations at the 3σ level with Δm 41 2  ≈ 1.3 eV2 and |Ue4| ≈ 0.1, even without any assumptions on predicted reactor fluxes. In contrast, the anomalies in the νe appearance channel (dominated by LSND) are in strong tension with improved bounds on νμ disappearance, mostly driven by MINOS+ and IceCube. Under the sterile neutrino oscillation hypothesis, the p-value for those data sets being consistent is less than 2.6 × 10−6. Therefore, an explanation of the LSND anomaly in terms of sterile neutrino oscillations in the 3 + 1 scenario is excluded at the 4.7σ level. This result is robust with respect to variations in the analysis and used data, in particular it depends neither on the theoretically predicted reactor neutrino fluxes, nor on constraints from any single experiment. Irrespective of the anomalies, we provide updated constraints on the allowed mixing strengths |Uα4| (α = e, μ, τ ) of active neutrinos with a fourth neutrino mass state in the eV range.

Keywords

Neutrino Physics Beyond Standard Model 

Notes

Open Access

This article is distributed under the terms of the Creative Commons Attribution License (CC-BY 4.0), which permits any use, distribution and reproduction in any medium, provided the original author(s) and source are credited.

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Copyright information

© The Author(s) 2018

Authors and Affiliations

  • Mona Dentler
    • 1
    Email author
  • Álvaro Hernández-Cabezudo
    • 2
  • Joachim Kopp
    • 1
    • 3
  • Pedro Machado
    • 4
  • Michele Maltoni
    • 5
  • Ivan Martinez-Soler
    • 5
  • Thomas Schwetz
    • 2
  1. 1.PRISMA Cluster of Excellence, Johannes Gutenberg University MainzMainzGermany
  2. 2.Institut für Kernphysik, Karlsruher Institut für Technologie (KIT)Eggenstein-LeopoldshafenGermany
  3. 3.Theoretical Physics DepartmentCERNGeneva 23Switzerland
  4. 4.Theoretical Physics Department, Fermi National Accelerator LaboratoryBataviaU.S.A.
  5. 5.Instituto de Física Teórica UAM/CSICMadridSpain

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