Global status of neutrino oscillation parameters after Neutrino-2012

Here we update the global fit of neutrino oscillations in Refs. [T. Schwetz, M. Tortola, and J. W. F. Valle, New J. Phys. 13, 063004 (2011); T. Schwetz, M. Tortola, and J. W. F. Valle, New J. Phys. 13, 109401 (2011)] including the recent measurements of reactor antineutrino disappearance reported by the Double Chooz, Daya Bay, and RENO experiments, together with latest MINOS and T2K appearance and disappearance results, as presented at the Neutrino-2012 conference. We find that the preferred global fit value of ${\theta }_{13}$ is quite large: ${sin}^2{\theta }_{13}\simeq 0.025$ for normal and inverted neutrino mass ordering, with ${\theta }_{13}=0$ now excluded at more than $10\sigma$. The impact of the new ${\theta }_{13}$ measurements over the other neutrino oscillation parameters is discussed as well as the role of the new long-baseline neutrino data and the atmospheric neutrino analysis in the determination of a non-maximal atmospheric angle ${\theta }_{23}$.

Figure 1

Upper panels: $\Delta {\chi }^2$ as a function of ${sin}^2{\theta }_{13}$ from the analysis of the total event rate in Daya Bay (solid magenta/light line), RENO (dotted line) and Double Chooz (dashed magenta/light line) as well as from the analysis of long-baseline (dashed blue/dark line) and global neutrino data (solid blue/dark line). Except for the case of the global fit, here we have fixed the remaining oscillation parameters to their best-fit values. Lower panels: contours of $\Delta {\chi }^2=1$, 4, 9 in the ${sin}^2{\theta }_{13}-\delta$ plane from the global fit to the data. We minimize over all undisplayed oscillation parameters. Left-hand (right-hand) panels are for normal (inverted) neutrino mass hierarchy.

Figure 2

$\Delta {\chi }^2$ profiles as a function of all the neutrino oscillation parameters ${sin}^2{\theta }_{12}$, ${sin}^2{\theta }_{23}$, ${sin}^2{\theta }_{13}$, $\Delta m_{21}^2$, $\Delta m_{31}^2$ and $\delta$. For the central and right-hand panels the solid lines correspond to the case of normal mass hierarchy while the dashed lines correspond to the results for the inverted mass hierarchy.

Figure 3

Upper panels: contour regions with $\Delta {\chi }^2=1$, 4, 9 in the ${sin}^2{\theta }_{23}-{sin}^2{\theta }_{13}$ plane from the analysis of long-baseline $(\mathrm{\text{MINOS and T2K}})+\mathrm{\text{solar}}+\mathrm{\text{KamLAND}}$ data (left-hand panel), $\mathrm{\text{long-baseline}}+\mathrm{\text{solar}}+\mathrm{\text{KamLAND}}+\mathrm{\text{new Double Chooz}}$, Daya Bay and RENO reactor data (middle panel) and the global combination (right-hand panel) for normal hierarchy. Lower panels, same but for (inverted) neutrino mass hierarchy.