Imprints of a light sterile neutrino at DUNE, T2HK, and T2HKK

Abstract

We evaluate the impact of sterile neutrino oscillations in the so-called $3+1$ scenario on the proposed long baseline experiment in USA and Japan. There are two proposals for the Japan experiment which are called T2HK and T2HKK. We show the impact of sterile neutrino oscillation parameters on the expected sensitivity of T2HK and T2HKK to mass hierarchy, $CP$ violation and octant of ${\ensuremath{\theta}}_{23}$ and compare it against that expected in the case of standard oscillations. We add the expected ten years data from DUNE and present the combined expected sensitivity of $\mathrm{T}2\mathrm{HKK}+\mathrm{DUNE}$ to the oscillation parameters. We do a full marginalization over the relevant parameter space and show the effect of the magnitude of the true sterile mixing angles on the physics reach of these experiments. We show that if one assumes that the source of $CP$ violation is the standard $CP$ phase alone in the test case, then it appears that the expected $CP$ violation sensitivity decreases due to sterile neutrinos. However, if we give up this assumption, then the $CP$ sensitivity could go in either direction. The impact on expected octant of ${\ensuremath{\theta}}_{23}$ and mass hierarchy sensitivity is shown to depend on the magnitude of the sterile mixing angles in a nontrivial way.

Locations

• Physical review. D/Physical review. D. - View
• arXiv (Cornell University) - View - PDF
• DataCite API - View