Invisible neutrino decay at long-baseline neutrino oscillation experiments

We perform an updated analysis of long-baseline accelerator data in the framework of neutrino oscillations in presence of invisible neutrino decay. We analyze data from T2K, NOvA and $\mathrm{MINOS}/\mathrm{MINOS}+$ and show that the combined analysis of all experiments improves the previous bound from long-baseline data by approximately one order of magnitude.

Figure 1

The bounds on ${\tau }_3/m_3$ obtained from the analysis of NOvA (red), T2K (blue), $\mathrm{MINOS}/\mathrm{MINOS}+$ (green) data, and the result from the combined fit (black). The solid (dashed) lines correspond to the analysis using normal (inverted) neutrino mass ordering. Also shown is the bound from Daya Bay (orange), which, as explained in the text, is weaker.

Figure 2

Contours in the ${\tau }_3/m_3-{\sin }^2{\theta }_{23}$ plane at 90% confidence level for two degrees of freedom for normal (upper panel) and inverted (lower panel) neutrino mass ordering. We show the contours from the analysis of T2K (blue), NOvA (red), $\mathrm{MINOS}/\mathrm{MINOS}+$ (green) data, and from the combination (shaded region). The arrows and the dot indicate the best fit values found in each analysis.