Abstract
The sensitivity of a joint oscillation analysis between the Tokai-to-Kamioka (T2K) accelerator and Super-Kamiokande (SK) atmospheric neutrinos is presented. The two experiments have been playing leading roles in the global constraints on neutrino oscillation parameters such as $\delta_{\mathrm{CP}}$, $\theta_{23}$, and neutrino mass ordering (MO). The atmospheric neutrinos observed in SK have a good sensitivity to the MO, meanwhile a precise measurement of the leptonic CP violation phase ($\delta_{\mathrm{CP}}$) can be achieved by the exclusive $\nu_\mu\rightarrow\nu_e$ and $\bar\nu_\mu\rightarrow\bar\nu_e$ oscillation measurements in accelerator neutrinos. However, possible degeneracy limits the measurement precision in each experiment. In this work, we perform a joint fit to overcome this obscurity with the correlation of systematic uncertainties taken into account. The impact of T2K near detector constraints on the fit of SK atmospheric neutrinos is tested, and an increase of sensitivity to $\delta_{\mathrm{CP}}$ and MO is demonstrated.
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