Probing CP violation at LBNE with reactor experiments

TL;DR

This paper investigates how combining data from reactor experiments with the LBNE enhances the potential to discover CP violation in neutrino oscillations, especially considering the precise measurement of the mixing angle θ13.

Contribution

It demonstrates that integrating reactor data with LBNE significantly improves CP violation discovery potential, especially with a near detector and in different mass hierarchy scenarios.

Findings

CPV discovery potential increases with reactor data integration.

A 35 kt detector can achieve 5σ sensitivity in 5 years.

CPV can be discovered at 5σ in IH mode with combined data.

Abstract

In this work, we have explored the possibilities of improving CP violation discovery potential of newly planned Long-Baseline Neutrino Experiment (LBNE), U.S.A., by combining with data from reactors. The third mixing angle $\theta_{13}$ is now very precisely measured and this precise measurenent of $\theta_{13}$ helps in measurement of CP violation. Here, CP violation is studied with and without data from reactors. Impact of placing a ND is also studied. It is found that CPV discovery potential of LBNE with ND increases when combined with data from reactors. With a far detector of 35 kt, it is possible to obtain 5$\sigma$ sensitivity of CPV when run for 5 years in $\nu$ and 5 years in $\bar{\nu}$ mode. When hierarchy is assumed to be normal hierarchy, CPV sensitivity is maximum. CPV discovery is possible by combining 5 years neutino data from LBNE with 3 years anti-neutrino from reactors. This study reveals that CPV can also be discovered at 5$\sigma$ cl in IH mode when appearance measurement of LBNE is combined with reactors.