Abstract
In this work we investigate the usefulness of nuSTORM as a probe of two new-physics scenarios which are sterile neutrinos and non-unitarity of the neutrino mixing matrix. For the sterile neutrino we show the importance of the neutral current events when combined with the charged current events to constrain the effective mixing angle, $\theta_{\mu \mu}$, and the sterile mixing angles $\theta_{14}$ and $\theta_{24}$. We also study the role nuSTORM will play in the study of neutrino oscillation physics if the three generation neutrino mixing matrix is non-unitary. In this context we elucidate the role of nuSTORM, considering both charged current and neutral current events, in constraining the various non-unitarity parameters such as $\alpha_{11}$, $|\alpha_{21}|$ and $\alpha_{22}$.
Highlights
Neutrino oscillation experiments have conclusively established the paradigm of the three-flavor neutrino oscillations and oscillation parameters are being determined with increasing precision
For the sterile neutrino we show the importance of the neutral current events when combined with the charged current events to constrain the effective mixing angle, θμμ, and the sterile mixing angles θ14 and θ24
Since we are in an effective two-generation approximation, the phases do not appear in the oscillation probabilities, and ignoring them one has Oscillation parameters sin2 θ13 sin2 θ12 sin2 θ23 Δm221 jΔm231j δ sin2 θ14 sin2 θ24 Δm241
Summary
Neutrino oscillation experiments have conclusively established the paradigm of the three-flavor neutrino oscillations and oscillation parameters are being determined with increasing precision. It was realized recently that beam-based long-baseline experiments can probe the parameter space of the sterile neutrino models and several studies have been carried out in this direction considering the current as well as proposed experiments. Future experiments such as DUNE [32] or T2HK [33] are high statistics experiments, and the systematics are expected to play a crucial role, one of the major sources.
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