Formula omitted] disappearance at the SPL, T2K-I, NO νA and the neutrino factory

Abstract

We study the measurement of the atmospheric neutrino oscillation parameters, θ 23 and Δ m 23 2 , at the ν μ disappearance channel at three conventional beam facilities, the SPL, T2K-phase I and NO νA. These two parameters have been shown to be of crucial importance in the measurement of two of the unknowns of the PMNS mixing matrix, θ 13 and the leptonic CP-violating phase δ. In our analysis, the effect of the two discrete ambiguities, sign ( Δ m 23 2 ) and sign ( tan 2 θ 23 ) , is explicitly taken into account. We analyse also the ν μ disappearance channel at the neutrino factory, and combine it with the “golden” ν e → ν μ and “silver” ν e → ν τ appearance channels to study its impact on the measurement of θ 13 and δ. Eventually, we present the sensitivity of the four facilities to different observables: θ 13 , δ, maximal θ 23 , the sign of the atmospheric mass difference, s atm , and the θ 23 -octant, s oct .