3+1 and 3+2 Sterile Neutrino Fits

Understand

We present the results of fits of short-baseline neutrino oscillation data in 3+1 and 3+2 neutrino mixing schemes.

• In spite of the presence of a tension in the interpretation of the data, 3+1 neutrino mixing is attractive for its simplicity and for the natural correspondence of one new entity (a sterile neutrino) with a new effect (short-baseline oscillations).
• The allowed regions in the oscillation parameter space can be tested in near-future experiments.
• In the framework of 3+2 neutrino mixing there is less tension in the interpretation of the data, at the price of introducing a second sterile neutrino.