The standard three-neutrino ($3\nu$) oscillation framework is being increasingly refined by results coming from different sets of experiments, using neutrinos from solar, atmospheric, accelerator and reactor sources. At present, each of the known oscillation parameters [the two squared mass gaps $(\delta m^2,\mathrm{\Delta }{m}^2)$ and the three mixing angles $({\theta }_{12},{\theta }_{13},{\theta }_{23})$] is dominantly determined by a single class of experiments. Conversely, the unknown parameters (the mass hierarchy, the ${\theta }_{23}$ octant and the CP-violating phase $\delta$) can currently be constrained only through a combined analysis of various (eventually all) classes of experiments. In the light of recent new results coming from reactor and accelerator experiments, and of their interplay with solar and atmospheric data, we update the estimated $N\sigma$ ranges of the known $3\nu$ parameters and revisit the status of the unknown ones. Concerning the hierarchy, no significant difference emerges between normal and inverted mass ordering. A slight overall preference is found for ${\theta }_{23}$ in the first octant and for nonzero CP violation with $\sin \delta <0$; however, for both parameters, such preference exceeds $1\sigma$ only for normal hierarchy. We also discuss the correlations and stability of the oscillation parameters within different combinations of data sets.

• Received 15 December 2013

DOI:https://doi.org/10.1103/PhysRevD.89.093018