The Discovery reach of $CP$ violation in neutrino oscillation with non-standard interaction effects

Abstract

We have studied the $CP$ violation discovery reach in neutrino oscillation experiment with superbeam, neutrino factory and monoenergetic neutrino beam. For NSI satisfying model-dependent bound for shorter baselines (like CERN-Fréjus set-up ) there is insignificant effect of NSI on the the discovery reach of $CP$ violation due to $\delta$. Particularly, for superbeam and neutrino factory we have also considered relatively longer baselines for which there could be significant NSI effects on $CP$ violation discovery reach for higher allowed values of NSI. For monoenergetic beam only shorter baselines are considered to study $CP$ violation with different nuclei as neutrino sources. Interestingly for non-standard interactions - ${\epsilon }_{e\mu }$ and ${\epsilon }_{e\tau }$ of neutrinos with matter during propagation in longer baselines in superbeam, there is possibility of better discovery reach of $CP$ violation than that with only Standard Model interactions of neutrinos with matter. For complex NSI we have shown the $CP$ violation discovery reach in the plane of Dirac phase $\delta$ and NSI phase ${\varphi }_{ij}$. The $CP$ violation due to some values of $\delta$ remain unobservable with present and near future experimental facilities in superbeam and neutrino factory . However, in presence of some ranges of off-diagonal NSI phase values there are some possibilities of discovering total $CP$ violation for any ${\delta }_{CP}$ value at $5\sigma$ for neutrino factory. Our analysis indicates that for some values of NSI phases total $CP$ violation may not be at all observable for any values of $\delta$. Using a neutrino beam from electron capture process for nuclei ${}_{50}^{110}$Sn and ${}^{152}$Yb, we have shown the discovery reach of $CP$ violation in neutrino oscillation experiment.

arXiv comment32 pages, 11 figures, Accepted for publication in Journal of Physics G: Nuclear and Particle Physics

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