Speaker
Description
Despite successfully explaining most of the global neutrino oscillation data, the three neutrino oscillation framework fails to accommodate the anomalous results from the short-baseline (SBL) experiments during the last two decades. The active-sterile neutrino oscillations with a mass-squared difference ($\Delta m^2_{41}\simeq$1 eV$^2$) much larger than the standard atmospheric ($\Delta m^2_{31}$) and solar ($\Delta m^2_{21}$) mass-squared splittings can explain the SBL anomalies quite well. However, in this work, we probe the active-sterile oscillations for a wide range of $\Delta m^2_{41}$ ($10^{-5}$- $10^{2}$ eV$^2$) at two long-baseline experimental facilities, DUNE and T2HK(JD)/ T2HKK(JD+KD). We also consider the near detector for DUNE and the Intermediate Water Cherenkov Detector (IWCD) for JD/KD to constrain the active-sterile mixing angles. We explore the CP-violation discovery potential and the CP-phase reconstruction capabilities of these experiments at different mass-squared splittings. We observe that the CP-sensitivity is maximum when $\Delta m^2_{41} \sim \Delta m^2_{31}$. The inclusion of the near detectors will help us verify the allowed regions of the SBL anomalies. We find that the sensitivity reach of the DUNE and JD/KD experiments for the active-sterile mixing angles $\theta_{14}$ are respectively $\sim$2$^\circ$ and $\sim$3.5$^\circ$ at 90$\% $ C.L., when $\Delta m^2_{41}$ is around 1 to 10 eV$^2$. Similarly, for $\theta_{24}$, the best bounds are coming around 1.5$^\circ$ and 0.5$^\circ$ for JD/KD and DUNE, respectively.
| Session | Neutrino Physics |
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