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. 2022 Mar 30;12:5393. doi: 10.1038/s41598-022-09111-1

Figure 4.

Figure 4

JUNO and LBνB mass ordering synergy dependences. The isolated synergy boosting term obtained from the combining JUNO and LBνB experiments is represented by ΔχBOOST2, as approximately shown in Eq. (1), see Appendix-C for details. ΔχBOOST2 depends on the true value of δCP and Δm322 precision, where uncertainties are considered: 1.0% (a), 0.75% (b) and 0.5% (c). The ΔχBOOST2 term is almost identical for both NMO and IMO solutions. Two specific effects lead the uncertainty in the a priori prediction on ΔχBOOST2. (I) illustrates only the ambiguity of the CP phase (yellow band) impact whereas (II) shows only the impact of the ±1σ fluctuations of Δm322, as measured by LBνB (orange band). The JUNO uncertainty on Δm322 is considered to be less than 0.5%. The grey bands in (II) show when both effects are taken into account simultaneously. The mean value of the ΔχBOOST2 term increases strongly with the precision on Δm322. The uncertainties from CP phase ambiguity and fluctuation could deteriorate much of the a priori gain on the prospected sensitivities. Δm322 fluctuations dominate, while the δCP ambiguity is only noticeable for the best Δm322 precision. The use of NuFit5.0 data (black point) eliminates the impact of the δCP prediction ambiguity while the impact of Δm322 remains as fluctuations cannot be predicted a priori. Today’s favoured δCP maximises the sensitivity gain via the ΔχBOOST2 term. When quoting sensitivities, we shall consider the lowest bound as the most conservative case.