Speaker
Description
Several anomalies over the last two decades point towards the existence of eV-scale sterile neutrino. In this work, we study the physics potential of two proposed long-baseline experimental set-ups in the presence of a light sterile neutrino, over a wide range of $\Delta m^2_{41}$ from $10^{-5}$ eV$^{2}$ to 10$^2$ eV$^2$. The first set-up consists of two Far Detectors (FD), namely Japanese Detector (JD) and Korean Detector (KD), and a Near Detector (ND); Intermediate Water Cherenkov Detector (IWCD). The second one is DUNE with one far and one near detector. We present here the discovery potential of total CP-violation induced by the standard CP-phase $\delta_{13}$ and the new CP-phase $\delta_{14}$ and also demonstrate the reconstruction capability of the true values of CP-phases for both experimental facilities. We observe that the CP sensitivity noticeably improves when we combine the data from JD and KD, and the performance is getting better compared to the DUNE set-up. Both the CP-phase reconstruction capability$ $ and CP-violation discovery potential get amplified if $\Delta m^2_{41}$ is of the order of the atmospheric splitting (i.e., $\Delta m^2_{31}$). We also present the exclusion limits from the above two experiments on the active-sterile mixing angles $\theta_{14}$, $\theta_{24}$, and the effective mixing angle $\theta_{\mu e}$. More stringent constraints on the mixing angles come from JD and JD+KD than DUNE (FD). The inclusion of the near detectors increases the sensitivity to the mixing-angles significantly for higher values of $\Delta m^2_{41}$, where both DUNE (FD+ND) and JD+KD+IWCD put competitive bounds on the sterile mixing parameters.
