hide
Free keywords:
High Energy Physics - Phenomenology, hep-ph,Astrophysics, Cosmology and Extragalactic Astrophysics, astro-ph.CO,High Energy Physics - Experiment, hep-ex
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 eV$^2$ scale
denoted by 3+1, 3+2, and 1+3+1. We discuss the hints for eV-scale neutrinos
from $\nu_e$ disappearance (reactor and Gallium anomalies) and
$\nu_\mu\to\nu_e$ appearance (LSND and MiniBooNE) searches, and we present
constraints on sterile neutrino mixing from $\nu_\mu$ 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.
