Abstract
Leptonic \textit{CP} violation search, neutrino mass hierarchy determination, and the precision measurement of oscillation parameters for a unitary test of the leptonic mixing matrix are among the major targets of the ongoing and future neutrino oscillation experiments. The work explores the physics reach for these targets by around 2027, when the third generation of the neutrino experiments starts operation, with a combined sensitivity of three experiments: T2K-II, NO$\nu$A extension, and JUNO. It is shown that a joint analysis of these three experiments can conclusively determine the neutrino mass hierarchy. Also, at certain values of \emph{true} \dcp, it provides closely around a $5\sigma$ confidence level (C.L.) to exclude \textit{CP}-conserving values and more than a $50\%$ fractional region of \emph{true} $\delta_{\text{CP}}$ values can be explored with a statistic significance of at least a $3\sigma$ C.L. Besides, the joint analysis can provide unprecedented precision measurements of the atmospheric neutrino oscillation parameters and a great offer to solve the $\theta_{23}$ octant degeneracy in the case of nonmaximal mixing.
Highlights
Neutrino oscillation, discovered by the SuperKamiokande (SK) experiment [1] and the Sudbury Neutrino Observatory [2,3], establishes palpable evidence beyond the description of the Standard Model of elementary particles: neutrinos have masses and the leptons mix
In Appendix B, as a message to emphasize the vitality of statistics in neutrino experiments, we provide a study on how the total of the T2K-II POTexposure can have a significant impact on the sensitivity results
To estimate quantitatively the sensitivity of the experiment(s) to the MpHffiffiffidffiffiffieffiffitermination, we calculate the statistical significance Δχ2 to exclude the inverted mass hierarchy (MH) given that the null hypothesis is a normal MH, which is indicated by the recent neutrino experiment results
Summary
Neutrino oscillation, discovered by the SuperKamiokande (SK) experiment [1] and the Sudbury Neutrino Observatory [2,3], establishes palpable evidence beyond the description of the Standard Model of elementary particles: neutrinos have masses and the leptons mix. This phenomenon is described by a 3 × 3 unitary matrix, widely known as the Pontecorvo-Maki-Nakagawa-Sakata (PMNS). The probability for an α-flavor to oscillate into a β-flavor, Pðνα→νβÞ, depends on three mixing angles (θ12, θ13, θ23), the CP-violating phase (δCP), two mass-squared splittings (Δm221, Δm231) where Δm2ij 1⁄4 m2i − m2j , its energy (Eν), the propagation distance (L), 2470-0010=2021=103(11)=112010(13).
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