Figure 5
From: Synergies and prospects for early resolution of the neutrino mass ordering
JUNO mass ordering sensitivity boosting. A significant increase of JUNO intrinsic sensitivity (\(\Delta \chi ^2_{\tiny \text {JUNO}} \approx 9\)) is possible exploiting the LB\(\nu\)B’s disappearance (DC) characterised by \(\Delta \chi ^2_{\tiny \text {BOOST}}\) depending strongly on the uncertainty of \(\Delta m^2_{32}\). Today’s NuFit5.0 average LB\(\nu\)B-II’s precision on \(\Delta m^2_{32}\) is \(\sim 1.4\%\). A rather humble 1.0% precision is possible, consistent with doubling the statistics if systematics allowed. Since NOvA and T2K are expected to increase their exposures by about factors of \(\sim 3\) before the shutdown, sub-percent precision may also be within reach. While the ultimate precision is unknown, we shall consider a \(\ge 0.75\%\) precision to illustrate this possibility. So, JUNO alone (intrinsic + boosting) could yield a \(\ge 4\sigma\) (i.e., \(\Delta \chi ^2\) \(\ge\)16) MO sensitivity, at \(\ge\)84% probability, within the LB\(\nu\)B-II era. A 5\(\sigma\) potential may not be impossible, depending on fluctuations. Similarly, JUNO may further increase in significance to resolve (\(\ge 5\sigma\) or \(\Delta \chi ^2\) \(\ge 25\)) a pure vacuum oscillations MO measurement in combination with the LB\(\nu\)B-III’s \(\Delta m^2_{32}\) information.
