(3+1)-spectrum of neutrino masses: A chance for LSND?

Abstract

If active to active neutrino transitions are dominant modes of the atmospheric ($ν_μ \to ν_τ$) and the solar neutrino oscillations ($ν_{e}\to ν_μ/ν_τ$), as is indicated by recent data, the favoured scheme which accommodates the LSND result - the so called (2+2)-scheme - should be discarded. We introduce the parameters $η_s^{atm}$ and $η_s^{sun}$ which quantify an involvement of the sterile component in the solar and atmospheric neutrino oscillations. The (2+2)-scheme predicts $η_s^{atm} + η_s^{sun} = 1$ and the experimental proof of deviation from this equality will discriminate the scheme. In this connection 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 $Δm^2_{LSND} \sim (0.4-10)$ eV$^2$. We find that in the (3+1)-scheme the LSND result can be reconciled with existing bounds on $ν_e$- and $ν_μ$ - disappearance at 95-99 % C.L.. The generic prediction of the scheme is the $ν_e$- and $ν_μ$ - disappearance probabilities at the level of present experimental bounds. The possibility to strengthen the bound on $ν_μ$- disappearance in the KEK - front detector experiment is studied. We consider phenomenology of the (3 + 1)-scheme, in particular, its implications for the atmospheric neutrinos, neutrinoless double beta decay searches, supernova neutrinos and primordial nucleosynthesis.