Phenomenology of 3+1 neutrino mass scheme

We study the phenomenology of the 3+1-scheme is revisited in which the fourth (predominantly sterile) neutrino is isolated from a block of three flavour neutrinos by the mass gap ΔmLSND2∼(0.4–10) eV2. The generic prediction of the scheme is the νe- and νμ-disappearance probabilities at the level of present experimental bounds.