The Reactor Anomaly after Daya Bay and RENO

Abstract

Gallium and short baseline reactor neutrino experiments indicate a short-distance anomalous disappearance of electron antineutrinos which, if interpreted in terms of neutrino oscillations, would lead to a sterile neutrino mass inconsistent with standard cosmological models. This anomaly is difficult to measure at 1 km baseline experiments because its disappearance effects are degenerate with that of theta_13. The flux normalization independent measurement of theta_13 at Daya Bay breaks this degeneracy, allowing an unambiguous differentiation of 1-3 neutrino oscillations and the anomalous disappearance at Double Chooz and RENO. The resulting anomaly is consistent with that found at very short baselines and suggests a downward revision of RENO's result for theta_13. A MCMC global analysis of current cosmological data shows that a quintom cosmology is just compatible at 2 sigma with a sterile neutrino with the right mass to reproduce the reactor anomaly and to a lesser extent the gallium and LSND/MiniBooNE anomalies. However models in which the sterile neutrino acquires a chameleon mass easily satisfy the cosmological bounds and also reduce the tension between LSND and KARMEN.

21 pages, 7 figures, v2 uses RENO results from nuTURN and Daya Bay results from Neutrino 2012

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Cited by in corpus (12)

• Light sterile neutrinos
• The clustering of galaxies in the SDSS-III Baryon Oscillation Spectroscopic Survey: weighing the neutrino mass using the galaxy power spectrum of the CMASS sample
• Reactor Antineutrino Anomaly with known θ_{13}
• Are Light Sterile Neutrinos Preferred or Disfavored by Cosmology?
• The Neutrino Mass Hierarchy at Reactor Experiments now that theta13 is Large
• The Neutrino Mass Hierarchy from Nuclear Reactor Experiments
• Probing light sterile neutrinos in medium baseline reactor experiments
• Probing Sterile Neutrino Parameters with Double Chooz, Daya Bay and RENO
• Medium Baseline Reactor Neutrino Experiments with 2 Identical Detectors
• Getting the Most Neutrinos out of IsoDAR
• Phenomenology of the Sterile Neutrinos
• The High Energy Neutrino Nuisance at a Medium Baseline Reactor Experiment